RE: 150 meter rule.
Over the last year there has been a fair amount of local focus on flying between 150m and 175m, with our chief judge working hard to ensure that our judges apply the rule book accordingly. We were very surprised how far out we were flying. Looks can be very deceptive. Especially with the likes of the F13, flying at less than 170m is more demanding. It was only when we had somebody stand at 150m and call out the distance with a two way radio did we get to appreciate how far out we were really flying. Flying closer at altitude is even more difficult, as the reduced lift and breaking makes speed management that bit more difficult. A bipe does help in that regard as I do find the bipe presents better closer, is easier to fly more slowly, and the speed can be controlled accordingly. Personally I found it a lot easier to fly big and fast far out. I'm now flying around 160m. But getting rewarded for flying closer is utterly dependent on the judges and their own perception of distance. If all judges knew precisely how far out we were flying and applied the rule book diligently I bet everyone would be flying within 175m. So I expect the judges will dictate accordingly, and actually need to be trained on what 150m to 175m looks like. Clint
Posted on: 9/14/2012 2:12 PM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11228635

RE: post some pictures of your pattern plane!!
A pic of Grant and my new Citrin's. Both are flying great. Awesome looks, design, build and flying characteristics. Another winner from Matt and Oxai. Regards Clint
Posted on: 8/1/2012 9:48 AM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11177287

RE: Removeable Stab for Valiant
Hi, the stab on the valiant is not adjustable, so permanently fixing it is fine if you never plan to remove it again. Tapping the carbon rod to make it removable is a very simple task, so I would not glue it in. If there is any play between the carbon rods and stab tubes you can build up the rods with some CA. That results in a tight fit with no play, yet can be removed if the need ever arises. Regards Clint
Posted on: 7/31/2012 1:19 PM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11176213

RE: Pletty Advance disassembly
Chris, I recall the local agent here mentioning that those screws do come out but require a lot of force to undo, and that you need to be careful that you don't strip the screw head in the process. He used a T-piece screw-driver that fitted the head of the screw well and whereby he could put a lot of down pressure on the screw when undoing them. Good luck!
Posted on: 7/20/2012 6:44 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11162314

RE: pics of your Pletty Advance install
Joe, the spacer you need sounds about right. I'd be warry of making the spacer out of something that will compress. Carbon laminated balsa will compress too much, and you'll be forever tightening the mounting bolts, and the gap between the nose and spinner will increase. I'd suggest that you make the spacer out of fairly hard ply. You can epoxy the ply spacer onto the CF laminate on the inside of the nose ring. Just be sure to sand the CF laminate first to get all residue off. The carbon usually has a bit of a release agent on it from the moulding process. Glue does not bond well if the CF laminate is not cleaned well. A bit of light sanding with a fairly heavy grit sanding paper is all that is needed. Once the spacer is glued in you can put some fibreglass or carbon laminate over the spacer, but that really should not be necessary.
Posted on: 7/16/2012 12:22 PM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11157552

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Hi Joe, Grant and my mounts are basically identical so the weights are essentially the same as what Grant has posted. The front mount (like Grant and I did it) is only really necessary with the Citrin as there is no front nose plate to attach the F3A front mount to. Using the F3A mount would have still required the installation of a front carbon structure, plus the additional mounting bolts etc. As we had to put a front plate in anyway, it made sense to make it such that it directly attaches to the motor and does not require the F3A mount as well. In your case if the plane has a traditional front nose then the F3A front mount should work great and I really would not bother with trying to make a completely new front mount. Clint
Posted on: 7/12/2012 9:54 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11152656

RE: pics of your Pletty Advance install
Joe, if you don't mind making up your own mount then have a look at how I did my Pletti Advance installation in the OXAI Citrin thread: http://www.rcuniverse.com/forum/m_10874037/mpage_2/key_/tm.htm The rear mount is a little different to the norm in that it is a clip fit onto the back of the rear bearing hub. The whole rear mount with bolts weighed a tiny 7g. So its extremely light and works very well. As the front mount is a rigid mount, the rear of the motor will not move anyway, and the rear mount is really just an added precaution, and will prevent a small resonance from developing into a big problem. Clint
Posted on: 7/11/2012 7:10 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11151246

RE: Comp ARF Valiant
That's great Freddy, I tried a whole lot of different CG positions and ended up with the CG on the centre of the wing tube. Clint
Posted on: 7/10/2012 12:10 PM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11150216

RE: Comp ARF Valiant
Hi Freddy, I ran my CG on the centre of the wing tube, but increased the main wing incidence slightly. The elevator was then flush with the stab. This plane likes to have a forward CG, and you will need to push a fair bit when inverted. I'd suggest you PM Bryan Herbest (you'll find one of his earlier posts) and ask him for his latest recommendation on setup with this plane. I know he has made some refinements on CG and incidence. Try his latest settings and let us know how it works out. Clint
Posted on: 7/1/2012 10:12 AM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11138646

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Well the final weight of mine without main flight pack is 3855g with the following equipment: Plettenburg Advance Hacker/Spin 99 Opto Mejzlik carbon Spinner Mejzlik EL 21x13 Futaba R6208SB receiver Futaba BLS-153 (AIL/ELE) Futaba BLS-451 (RUD) Emcotech Rx switch/regulator (7.2V) Hyperion 550mAh 2s1p r/c battery pack MK Tail Gear Tettra Foam Wheels MK ball links with Central Hobbies titanium ends and carbon rods for linkages But's it's difficult to really get a feel of the relative weight compared to other completed Citrins as we're all using different scales and a 1% error in the measrement is very significant. Clint
Posted on: 6/29/2012 3:49 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11136166

RE: Running Futaba servos at 7.2V
Thanks Chad. That's good to know. Regards Clint
Posted on: 6/21/2012 12:32 AM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11126172

Running Futaba servos at 7.2V
Hi, I'm running Futaba BLS servos on my 2m bipe. BLS153 on aileron and elevator, and BLS 451 on rudder. The Emcotech regulator switch is adjustable 5.9V or 7.2V. These servos are not HV servos. Looking at the Futaba website they are rated for a voltage of 6V. I'm aware that several pilots are running these servos at 7.2V which significantly increases their speed and torque. The difference is noticable. I can appreciate that it would not be good to run these servos off an unregulated 2cell lipo as I expect that the full charge of 8.4V would be a problem. For that you would need to use a HV rated servo. What are the experiences of running these BLS servos off regulated 7.2V? Any failures or issues that could have been associated with running at this voltage? Regards Clint
Posted on: 6/20/2012 1:40 AM by Author "cartercg" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11124787

RE: New Plettenberg F3A motor
Woodie, my advance with prop washer, nut etc also weights just over 600g, same as yours. So it does seem to be a little heavier than the advertised weight, but is a great motor non the less. Regards Clint
Posted on: 6/12/2012 1:15 PM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11115847

RE: New OXAI CITRIN by Wolfgang and Roland Matt
I managed to get in a few quick late afternoon trim fights. As mentioned in a previous post I shifted the main flight battery right of centre to compensate for the Rx, switch and speed controller installed on the left hand side of the fuze (see first pic). I'm pleased to report that it solved the heavy left wing tendency, and she pulled and pushed with wings level. I'm not keen to have to install the packs like this indefinitely so moved the speed controller to the right hand side of the fuze. It should roughly balance of the Rx, switch, Rx battery and stab to Rx leads that are installed on the left hand side of the fuze. I should then be able to install the packs in line with the centre of the fuze (2nd pic) and not have a heavy wing issue. I see from Juan's video with camera inside the plane that he has a similar setup. I'm running the CG about 13mm forward of the recommended CG. I'm finding the plane tracks, snaps and lands better. Before it felt very tail heavy (to me). It's comming to the canopy on both knife edges, and I'm starting to mix that out as I don't want to move the CG any further back.
Posted on: 6/12/2012 12:55 PM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11115826

RE: New OXAI CITRIN by Wolfgang and Roland Matt
They're 4mm bullets. I've been using them (as have other pilots) for years without issue.
Posted on: 6/12/2012 4:09 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11115309

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Ok, some feedback on the flight characteristics of the Citrin..... I started with the CG at the recommended location, but found it tail heavy. This was especially noticeable on landing. Moving the main flight pack forward an inch moved the CG forward about 10mm and that improved the tracking. The plane was less prone to bouncing on landing. With a light motor like the Pletti Advance, one needs to move everything as far forward as possible so that the required CG can be achieved. My 1135g Hyperion packs are now sitting about 25mm from the back of the motor, and will sit right up against the motor if I save another 35 to 40g with a lighter prop. So anyone building this plane should move everything as far forward as they can. I did and even so my flight packs are sitting far forward in the fuze. I tried different aileron differentials, but zero differential seems best and the feedback I've got from other pilots agrees with that. I'm still paying with the CG and it's early days, but it looks like she will come to the canopy on both knife edges. Moving the CG back to prevent this seems to cause other compromises. I expect I'll end up with a Rud-down elev mix, but not more than a few percent. Rud-Aileron coupling is superb. Even during a knife edge loop I hardly had to breathe on the aileron to keep her exactly on KE. If is does end up with some mix it will probably be less than a percent. My only real "irritation" thus far is that the left wing drops when pulling and pushing. Upright and inverted she does not roll, so aileron alignment is very good and she is not carrying noticeable aileron trim. It points to a slightly heavy left wing (the stabs are parallel with the main wings and incidences of both stabs are the same). On some thinking on the cause I realised that the Elev servo wires, Rx, Emcotech switch and Spin 99 are all installed on the LHS of the fuze. That's at least 150g on average around 80mm from the centreline of the fuze. It equates to probably about 10g of wingtip weight and may be the cause of the "heavy left wing". I've move the Rx battery to the RHS of the fuze, and for the next flight will strap the main battery about 10mm offset to the right of the fuze centre line. Hopefully that will balance her laterally and the wings wil stay level when pulling and pushing. I had a very near miss on the weekend when after the first flight I was changing the main flight pack and noticed the 4mm bullet on the +ve of the speed controller was sitting at a severe angle. I stripped off the heat-shrink and see photo below. Basically it looks like there was a hot spot in the connection which caused the solder to heat and the entire connection almost failed. This is the first time I've had such a failure/situation. I was lucky as a dead stick in the wrong part of the sky could have ended really badly. Looks like a few more seconds of power when it was hot could have caused a complete failure as the end of the battery lead was just attached to the bullet. You can see in the photo how it had pulled out of the bullet and the solder has melted onto the outside of the bullet.
Posted on: 6/11/2012 2:21 PM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11114737

RE: New OXAI CITRIN by Wolfgang and Roland Matt
He's not even allowed to touch the Peridot!!! Like Grant mentioned it was Wolfgang Matt's A plane at the Worlds at Munice, and still has the FAI markings and Matt's numbers, branding etc. It's a special plane from a sentimental perspective, and it flies great. I'm running a bit more positive incidence and forward CG compared to how Wolfgang had it set up. Stall turns and spins are fantastic, as are snaps and rolls. It carves through the F13 really nicely, but the knife edge parts need a lot more rudder work as compared to the Citrin.
Posted on: 6/10/2012 1:05 PM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11113443

RE: New OXAI CITRIN by Wolfgang and Roland Matt
So I lengthened the tail wheel by about an inch and the fuze now sits a bit better. See below pics: The plane before lengthening the tail wheel (spats are now red!). You can see that it sits at a fairly large angle. Raising the tail by an inch will help. Original tail wheel (MK). Modified tail wheel. It also gives the stabs a bit more clearance as they sit close to the ground. Hopefully the stabs will now also talk less abuse from stones etc thrown up by the wheels and prop. My son Thomas with his RC toy - fortunately they're cheap at his age......that will change if he ever wants for fly F3A and dad has to equip two planes!!!!
Posted on: 6/10/2012 11:08 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11113330

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Juan, great video, and very interesting to see the inside of the plane during flight. I agree that it would probably be a good idea to prevent some of the wire movement, especially the Rx battery leads as all of the movement can't be good. At least you have a dual bat setup so if one wire breaks you won't crash. I got your message, thanks again for the feedback. It would be great if you could post the throws you're using for spins and snaps. Perhaps you can measure them next time you're flying the Citrin. The distance the rudder moves at the top, elevators at the ends of the stab and ailerons at the inside. One difference I'm finding with my Citrin is that she has a tendency to want to bounce on landing i.e. as the rear starts to touch down the wing creates lift and she takes off again. I think it may be largely due to my replacing the stock gear with a carbon one with more flex, as the replacement gear is about 1 inch longer than the supplied gear. It may be that the additional angle on the wings is then causing the problem (I'm using a MK tail wheel that is not very long). Perhaps I need to make the tail wheel a little longer so that she sits a bit more level? Or is this a tendency with the bipe? I have more than enough prop cleranace so lengthening the tail wheel won't be a problem. Has anyone had a similar porblem where lengthening the main gear resulted in this tendency? Regards Clint
Posted on: 6/10/2012 6:44 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11113102

RE: New OXAI CITRIN by Wolfgang and Roland Matt
The maiden went well this morning. It was a beautiful calm and clear winters morning in Africa! After going through the plane carefully and doing a range test etc it was time to get her airborn. On takeoff she rolled off nicely but then pitched up into the gear very quickly and started to nose over a little. I pulled her off and she went up nicely but needed a lot of up trim. Turns out the factory set (adjustable) stab was not well set and had too much down elevator. Other than that she required very little else. It was my first time flying a bipe, and I found that the wings etc presented fine and there wasn't a big adjustment from flying the mono. The big ah moment was when I rolled her onto knife edge and applied about the same amount of rudder as I used to keep my Peridot on knide edge. She proceeded to then do a fairly nice big knife edge loop. Boy the rudder is powerful, and I'll have to go up on the rudder expo and get used to it. After landing I lowered the leading edge of the stab by 2.5 turns on the stab adjuster, and that got ride of the up elevator trim. By the second flight she was already starting to feel locked in. The aileron alignment seems very good as she does not roll handsoff upright or inverted. Down line will need a little of the usual low throttle to down elev mix. I'll still need to play with the knife edge coupling, but she seems to need very little mix. So far I'm really happy. I had to keep it to 2 flights as a lunch appointment with the missus kept me from the field. Happy wife = happy life..... There were only two small things to attend to after the first flights. 1) The one main wheel was binding slightly, and 2) the stab had a little bit of play in it. Both were easy fixes. For the stab issue I applied some CA to the two carbon tubes that attach the stabs to the fuze, and thereby built up their diameter a little. That worked great and they are now a nice stug fit and there is no play at all. See some pics from JOMAC field this morning (on the northern side of Johannesburg): Wind sock was standing still but by the time I got airborn there was a slight breeze down the runway...perfect for a first flight. The Citrin fits in my SUV fine, but goes in upside down. The plane with cradle fit in without any problems. Assembly is straight forward. First the bottom wing is attached with two 4mm bolts. Then it gets turned upright and the two wing struts get attached, followed by the top wing with its two 3mm bolts. In the one pic you can see were I have opened up two holes in the landing gear area to provide some air exit for cooling. I started with the CG slightly forward of the recommended CG as I ended up a bit further forward than Wolfgang's setting on my Peridot. The Hyperion 4600 25C batteries sit nicely and is easily accessible via the top battery hatch. Pics of the plane just before the first flight. Note the nice prop clearance, which I needed when she pitched forward on takoff due to the stab having to much down elev incidence. Regards Clint
Posted on: 6/5/2012 6:59 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11107133

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Ok, here are some more pics from the build.... The big scoop at the bottom of the motor should get plenty of airflow onto the Advance. The battery tray is made of 3mm balsa laminated on both sides with carbon cloth. The battery tray was installed halfway up in the fuse, similar to the pics on the Oxai website. The Spin99 speed controller is attached to the side of the fuze with velcro. Rx battery attaches with velcro to the landing gear plate. An Emcotech regulator/switch is installed but not visible. It is the 5.9/7.2V spec. I note that Wolfgang runs his normal futaba servos at 7.2V. I'll have the option but have not yet decided if I will run at 7.2V. With a flip of the micro switch on the Emcotech I will be able to see if there is much of a difference in servo speed and torque. Rudder servo is Futaba BLS451. I did a fair amount of trimming of the supplied rudder servo monting braces and must have saved at least 5g. The Futaba R6208SB Rx is 8 channels and all 8 are used. The battery is pluged into the Rx S-Bus port. Rx is attached to fuze with velcro. The aileron extension leads seem a bit too heavy duty and I may change them out later for lighter ones and same a few more grams. Weights at present ready to fly is: Fuze 2573g Top wing 636g Bottom wing 656g Wing attachments 46g Total without main flight pack 3911g Hyperion 4600 25C 1134g Total with main pack 5046g I have a Meslijk 21/13 extra light prop on the way, and it will save another 40g, bringing the total weight to 5000g, which is fine. There are a few other small opportunities for further weight savings. The rudder servo used is 15g heavier than the one recommended by Wolfgang. So I'll make weight without too much of a problem. But it comes at a cost as everthing has to be the lightest etc. I was hoping to maiden her this afternoon, but the last few items took longer than expected and I was not going to rush things. So tomorrow morning I hope to be airborn and will revert back on my first impressions. Regards Clint
Posted on: 6/4/2012 11:20 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11106066

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Hi guys, I was not aware that the weight on the Oxai site excludes gear and spats. I made a mistake with my previous weights and all up dry weight including gear and spats is about 2488g. I can't tell for sure exactly as I was already well into the installation before realising I had missed something. Anyway it would not make any real difference as I've been trying to build it as light anyway. I've also done some dremel work on the spats, battery latch, rudder servo mount etc and just that alone saved more than 20g. But with a plane like this you have to put in light equipment. See some pics below on the build: Aileron linkage, complete with Futaba BLS153, Central Hobbies titanium rod ends and carbon rod, MK ball links and a small horn. Installation was straight forward, but the bottom of the servo does touch the bottom of the wing, so a small spacer was required to lift the one side of the servo slightly. The spats had to be opened up a lot to fit the 55m wheel and NMP wheel axil. They were then very flimsy at the attachment points so I reinforced with some fibreglass cloth. I’ll paint them later. I used a 3mm countersunk bolt that goes into a small 3mm blind nut to prevent the spat from rotating. The motor mount was the most involved part of the build. It is slightly different as the design does not have a traditional “flat� nose. The required thrust is built into the nose, but there is no structure to secure a motor mount to. My front mount is made out of carbon plate that I laminated, and is 2.7mm thick. The motor is a Pletti Advance. What I did was use a modified protractor to etch out a line where the nose bends into the inside of the plane. This line is parallel to the required thurst. I then used a dremel and removed the material until I had a reference that was exactly parallel to the built in thrust. Then I measured how far back the motor would need to be in order to be flush with the nose. Given that the carbon plate is 2.7mm thick I then needed a 3mm balsa spacer to have the motor exactly where I need it. Then I cut the carbon to size such that it fits nicely and the motor is centered. Then I made suitable cutouts in the carbon plate to get the weight down and allow air to flow to the motor. The front mount weighed less than 20g and uses 3 bolts for the motor. Although it is probably not required, I feel a bit more comfortable if the motor is also supported at the back. The rear support that goes around the outside of the motor (like with the old 14XL) works well but is perhaps a bit heavy for my liking. What I did is machine a small carbon brace that clips onto the rear bearing hub on the back of the Advance. It is just the right size so that with a little pressure it just clips on nice and snug. Then there are two small tabs that go onto the sides of the fuze. The whole rear mount including tabs and 2mm bolts weighed 7g!!!! The result is a nice light motor mount, supported front and rear. The whole mount including front and rear mounts, bolts and glue was less than 35g. I don’t think it can be done much lighter. The last part of the build was the installation of the battery tray. Speed controller etc. I'll post more on that later. Regards Clint
Posted on: 6/4/2012 5:12 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11105622

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Hi, Well the long wait is finally over. After placing the order in early Jan, the Citrin finally arrived in Johannesburg. Grant and I each ordered one, and they arrived in their wood crates with no damage. Packaging was very good. It’s my first Oxai build and first bipe. I’ll post some progress on the build as it progresses. Build quality is fantastic. Everything fits together perfectly. Some of the guesswork things are pre-done. For example the elevator and rudder horn holes are predrilled. Also the rudder cut-outs for the wires are pre-done, which is great. The finish is top class Oxai. If one looks carefully there are some small imperfections in the fuze mold. But this is as good as one can expect. The paint scheme and finish is awesome. I just want to hang it in my house!!! But as would be expected in keeping the weight down the construction is such that it’s not going to resist dings and scrapes. Fortunately the excellent covers will help. They too fit really nicely and are worth the extra expense. I’ll post weights of individual components later, but the weight of the fuze, stabs, wings, gear and spats including all stab tubes and wing mounting hardware is 2365g on my scale, which is only 15g more than the claimed weight of 2350g on the Oxai website. Hence there should be no problem making weight provided one uses the likes of BLS servos, carbon prop and spinner etc. I’m hoping for a weight of 3800g all up without the main flight battery pack. Some pics thus far: The two boxes with planes nicely packed and damage free. My home made rudder horn such that the rudder horn offset from the hinge line is catered for. As a result there is no stacking or tensioning of the rudder lines at extremes of rudder throw. Stab servo installations with BLS153 servos, MK ball links and Central Hobbies titanium rod ends and carbon rods. Everything fits nicely and results in a slop free linkage with the servo arm and linkage at 90deg. Wheel spats are tiny and will not accept a normal 55mm wheel. I opened them up with a dremel . The one on the left has been modified. Not the greatest spats I've seen but they should be fine. Landing gear bolts in nicely, but is very rigid. I’m concerned that it does not have enough give and as such will be hard on the fuze mountings. I’m considering installing a different set of gear with more flexibility. Landing gear plate. I have installed additional carbon cloth where the gear plate interfaces with the fuze so as to reduce the likelihood of fuze damage for a less than ideal landing. The plane assembled, but much work still remains to install wing servos, motor, battey tray, radio install etc. Regards Clint
Posted on: 5/30/2012 5:11 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11099667

RE: P13 Reverse Spins
Hi, I have experienced exactly the same with my Valiant, which was also set up as per Bryan's incidence and CG recommendations. I tried all sorts of things to get rid of it, but it was noticable especially in light wind conditions. I know of some pilots that will do the second spin as a negative spin, whereby there is no jump forward as the spin direction changes. Only a really sharp judge will pick it up, but if they are looking for that cheat then it's a sure zero. Certainly less elevator helps reduce the tendency to jump forward during the direction change, but you still need enough elevator to enter the spin, especially in calm conditions. I've only just started to fly a Peridot, and I was pleasently surprised to find that it has less of a tendency to jump forward during the reversal. I don't think it has quite as much +ve incidence on the main wing and CG is a little further back than the Valiant (my Peridot has a small tuck to the wheels on L rudder KE). Regards Clint
Posted on: 5/21/2012 10:55 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11088962

RE: what is the best front mounted motor
Hi the Pletty Advance is one of the most efficient motors available for a 2m plane. Peak power will depend on how it is proped. I don't think it is any harder on the batteries as compared to say a Q80. Throttle curve and throttle management with the right prop will result in it being as easy on the packs as any other motor out there. The advances does have lots of power, but it is very efficient. Peak current draw (for comparable power output) is as good as it gets in terms of what is commercially available.
Posted on: 5/6/2012 10:42 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11070425

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Juan, will be great if you can let us know where you end up with your CG and the associated mixes.
Posted on: 5/6/2012 10:36 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11070416

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Thanks Juan, 150m is a lot closer than most people think, and I expect the bipe will make managing the speed easier, especially keeping the fuze horizontal when on KE even when relatively slow. This will be even more pronounced when flying at altitude like we do here in Johannesburg (5000 feet). Its good to hear that the mix requirement is minimal. Judging from your feedback it seems that there is little to no push or pull when on KE i.e. no need for rud to elev mix with the CG at the recommended location? Regards Clint
Posted on: 5/4/2012 11:00 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11068328

RE: New OXAI CITRIN by Wolfgang and Roland Matt
One thing is for sure.....you don't need to take a covering iron to it
Posted on: 5/3/2012 11:31 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11066990

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Hi, it's a fully composite kit, as with all Oxai planes. Juan, that is a great video, very nice indeed. It's difficult to get a real feel for the pace but judging from the video it appears to fly fairly slowely and you manage to make the likes of the rolling horizontal 8 nice and compact. How are you finding the CG...the same as the factory recommendation? What sort of mixes are you needing? Regards Clint
Posted on: 5/3/2012 10:25 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11066926

RE: New OXAI CITRIN by Wolfgang and Roland Matt
Hi Jean-Claude, Thanks for the feedback. That's great, and a very good weight for a bipe. Making weight should be possible even with 5000mAh packs. My build will be very similar: Pletti Advance Spin99 Mejzlik 21x13 Marquet Spinner 6x Futaba BLS 153 1x Futaba BLS 451 Emcotech receiver switch/regulator 5.9V Futaba R6208SB receiver TP 720 mAH 2s1p RC battery I expect my weight will be very similar to yours. I expect it will also be great for the F13, with all the KE elements. What tendencies does she have. Do you need much rudder to aileron mix? Is your CG similar to that in the factor specs? Regards Clint
Posted on: 4/18/2012 11:07 AM by Author "cartercg" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11047321