RE: gee bee
PM sent. Peter
Posted on: 5/21/2013 6:35 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11518079

RE: gee bee
Interesting plane this! I had the Mallard which had a fuselage rather than the twin booms. The plane is only three channel and was powered with a OS 25. Mine flew nicely but because of the Gee Bee floats would not take off unless there was some chop on the water. I used to get kids to throw stones in front of the plane when the water was calm to create some ripples. The tip floats were humongous, I once heard them refered to as inverted Dixie Cups. I have the plans for the Mallard which is exactly the same except for the twin booms. I kinda liked the twin boom look. It reminds me of an old Sikorsky. Peter
Posted on: 5/20/2013 8:54 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11517828

RE: Questions: Ace Seamaster 120
Thanks Wayne. Peter
Posted on: 8/6/2012 3:25 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11182555

RE: Questions: Ace Seamaster 120
Sorry the pic did'nt copy; I'll have to take a new picture with my own camera. Something about Mac's and PC's not talking to each other. One comment about the weight; I haven't weighed mine yet but it must be well over 20#. I had to add about a pound of lead to the nose to get it to balance. The stab is very heavy and to construct it using stick and sheeting construction could probably halve the weight thus eliminating some of the nose weight. I bet a pound total weight could be saved by this one mod. Peter
Posted on: 8/5/2012 10:38 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11181685

RE: Questions: Ace Seamaster 120
As promised, here's the Sea Master
Posted on: 8/4/2012 7:19 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11180626

RE: Questions: Ace Seamaster 120
Goirish, That's basically what I'm doing except mine are completly under the stab. I'm attaching mine where the rear stab brace attaches. I figure theres less chance of them getting knocked off there. What's the approximate area of your fins? Peter
Posted on: 8/2/2012 8:23 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11179210

RE: Questions: Ace Seamaster 120
I just finished the first three flights with my Sea Master 120. I must say it provided a few exciting moments but it survived. Power is a ST 3000 swinging a 18 X 8 MAS prop. Water handling was great and the takeoffs and landings were without incident but WOW, that adverse yaw in flight. The plane has no directional stability whatsoever even though mine has the fin fairing added. After I mixed 50% rudder coordinated to the ailerons things were much better. Now that it's home I'm fabricating sub fins which will add approximately 30 sq. inches to the fin area. Another thing which I think will help is to use differential aileron with tons of up and hardly any down. I think there's hope for the design and it's pretty easy to see why theres so much adverse yaw once you start scrutinizing the design. I'll post some pictures as soon as I receive some from a friend of mine who fortunately had a camera there. Peter
Posted on: 8/2/2012 6:12 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11179118

RE: Cambridge scientist debunks flying myth
Does not the vertical component of a wing (lift) overcome gravity which is accelerating the wing (and aircraft) downward at 32'/sec/sec not constitute work? This discussion is getting good. I have an analogy: since we are discussing fluid mechanics really and we are trying to define how lift is created and it's resultant force on the earth and the atmosphere here is what I submit. Take an undersea submersible which is ballasted to slightly heavier than its displacement of water and put it in a swimming pool. we now have a heavier than water flying machine. This machine has dive plates (wings) and we start it up. First of all the volume of water in the pool can be measured and its weight determined. The sub also has weight which must be added to the weight of the water. We now have a closed system which is analagious to the atmosphere with an airplane in it. If we start the submersible, tilt the wings up the sub should move forward and rise off the bottom of the pool and manouver about (fly). The pool and sub still weigh as much as they ever did and the dive planes are lifting the sub off the bottom of the pool. Without a motor the sub would not move and without dive planes the sub would not lift off the bottom. This would be a closed system which allows us see that nothing is either added or subtracted from the experiment. So what we have is a requirement to have enough power to move the sub fast enough to give the planes enough "bite" to fly through the water. In a aircraft the choice of airfoil is determined by the job the aircraft has to do and the choice of engine has to do with moving the aircraft fast enough so the plane will fly. The airfoil generates a tremendous vaccuum on the upper surface as well as pressure from below which I think is due to angle of attack. I have had poorly secured hatches "explode" off the top of a wing on a heavy camera plane. The vortexs and downwash seen in the agricultural planes earlier are not contributing to the lift; they are the result of lift. Notice the tip vortex curling around to go to the low pressure area on the top and the downwash is a result of the aircraft deflecting the air downward just as the wake of a boat spreads out behind. Peter
Posted on: 2/17/2012 1:18 PM by Author "PeterC" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10963485

RE: Cambridge scientist debunks flying myth
I've been following this thread for a while and what it seems to me is that everyone is looking for a single explaination. Why can the answer not be a combination of a combination of Bernouli, Coanda, and plate effect (flat plate like some foamies)? Mr Bernouli discusses low pressure development as a result high velocity fluid vs. low velocity. Mr Coanda discusses fluid adhesion of a moving fluid over a irregular surface and everyone has flown a kite or a foamy which has no airfoil. Each has a contribution to the total lift of a wing and I don't think that can be refuted. A friend of mine was once flying an ultralite aircraft (real one) when the covering on the upper surface pulled away from the ribs. At this point the aircraft came down like a clump of grass and was barely controlable. I think this demonstrates that there is a lot of suction on the upper surface. I have seen no mention of Reynolds numbers in anyones responses to this post; are they not a factor? One final thought; In aircraft design it is a fact that lift produced is a function of the size of a wing and that the lift coefficient is a cubic function of the size. ie: double the aircrafts size and the lift will be 8X the original value. (2 X 2 X 2 =8). From this I have concluded that lift is a function of the amount of air that the wing and the airfoil displace. I think Mr Reynolds would have to agree with this. Peter
Posted on: 2/10/2012 9:01 AM by Author "PeterC" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10952764

RE: twin seamaster engine size?
Don't let price be the governing factor although there are plenty of good, inexpensive engines out there. I would suggest a simple single engine test bed of a plane to be sure the engines are reliable. Perhaps the most important consideration is the location of the fuel tanks. the top of the tank should be at, or just slightly above the C/L of the needle valve. If it is too high the engine will flood when it is full and starve when it is nearing empty. If it is too low it will not draw fuel properly when taking off and starve when it is nearing empty. Another hint, use OS A3 glow plugs. They are hotter than normal plugs and are more reliable for use on a twin. don't try to peak the engines out, settle on reliability. Also it is not necessary to have each engine exactly the same RPM wise. 2-300 RPM difference is OK. You can compensate for any variation with the rudder. Peter
Posted on: 1/20/2012 9:46 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=10918622

RE: twin seamaster engine size?
Hi Jim, I don't know about the extreme out thrust; I have never needed, or felt a need for anywhere that much. My usual proceedure is to err on the side of out thrust; usually never more than a degree or so. As far as setting the thrust line and the nacells I make the entire nacell sit on the upper surface of the wing with the thrust line slightly above the top camber of the airfoil. With the smaller diameter of the props, compared to what a 40/45 swings, the water clearance is usually fine. Usually my only problem is spray from the hull entering the prop arc. Spray rails usually solve this. Peter
Posted on: 1/19/2012 4:13 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=10917613

RE: twin seamaster engine size?
I'm not familiar with ASP 25's, but as with any other twin be sure the engines are reliable, especially in the mid range where most of the flying will be done. I used a pair of old HB'25's on a twin seaplane about the same size as the Sig sealane and it had plenty of power so your 25's should be fine. My current project is a Sea Cruiser (designed for a single 40/45) and I am using a pair of OS 26 four strokes. From my experience it should have lots of power. Peter
Posted on: 1/19/2012 2:30 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=10917478

RE: Seamaster perfect engine??
So what's wrong with a 10" prop on a North Star? Any thing bigger and I suspect you want to put a 4 stroke in it. Thats like putting a John Deer in a Ferarri.
Posted on: 1/8/2012 10:30 AM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=10897985

RE: Seagull Sparrow Hawk 62cc
Nice thread going here guys. I have the smaller Sparrowhawk powered with a ST 2500 and must report it flys great. Regarding the airframe I think Seagull did a fairly good job of recreating the Sparrowhawk outline but probably thought those mid 30's British color schemes were pretty boring and someone saw a picture of the Chilton which does have a similar shape but a more attractive colorscheme so thats what they did. Can you spell "marketing"? My 2500 pulls the plane along with great authority and it makes a great sport scale flyer. The landing gear appears to be manufactured from recycled coathanger wire and I too had to bend up a new one from piano wire. Once I add a few ounces of nose weight it should be a real smooth flyer. Cheers, Peter
Posted on: 8/5/2011 8:36 AM by Author "PeterC" in the forum "ARF or RTF"
http://www.rcuniverse.com/forum/fb.asp?m=10656631

RE: Bridi RCM Trainer
I've been following this thread for a while. The RCM trainer is one of my old favorites and it's always nice to visit old friends. Regarding the use of Golden rods I find that they work very well but BOTH ends of the outer sheath MUST be well supported. Also be sure that where the rod exits the outer sheath that you use the steel threaded rods from there to the servos and the control horn(s). I don't see why you can't use the hole where the original pushrods exited the fuselage and bond them there. The best glue I have found for gluing the outer sheaths is Automotive Goop. I also find it best to have a few inches of rod between the exit and the control horn. It allows the rod to work back and forth and prevent binding. If you can't secure both ends of the outer rod then you should use solid pushrods. Peter
Posted on: 3/13/2011 8:47 PM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10398251

RE: Bridi RCM Trainer
Speaking of Bridi trainers has anyone seen or heard of the T 10? This was a little 10 sized trainer with a flat bottomed airfoil. I had one many years ago and it sure flew well. I would love to get my hands on some plans or three views and build another for one of my old Enya 09's. Peter
Posted on: 1/28/2011 10:15 AM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10295555

RE: Diesel .049
While on the topic of diesels, I aquired a OK 049 diesel which seems to have very little compression. Did OK also use a O-ring to seal the contra piston or did they use some other method? Are there any experts out there with OK experience?
Posted on: 10/8/2010 7:14 PM by Author "PeterC" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=10056564

RE: Laser arrow Delta question.
When I had my Laser it was powered with a Rossi 40 with the black tuned pipe. I think I used to turn a 9 X 7 APC. For launching I had a helper point it up at about 45 degrees and just let go. The plane wouold prop hang for the first few feet and then be flying. My problem was that after one launch no one would do it again because they were covered in exhaust slime. It was the fastedst plane I've ever owned. My question. Where can I get another one? Peter
Posted on: 8/20/2010 2:52 PM by Author "PeterC" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9947769

RE: MiniMag... by OS Engines
I love my little MiniMag. E-power with a cheap BP21 and a 20Amp speed control. Juice comes from a 2200 mah lipo. It easily flies 20 minutes on one charge and get this, on floats. Prop is a GWS 8 X 4 orange. I used the Hobby Zone foam floats and modified the wire struts and mounted the bracket to the fuselage. It easily RoW's. All my electrics are cheap Chinese stuff and as of yet have had no problems. I still really enjoy flying glow powered planes but the performance of this little unit makes one think, (WHY glow)? Peter
Posted on: 7/29/2010 11:56 AM by Author "PeterC" in the forum "Electrics to Glow Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=9896626

RE: Just ain't my day!!!
Too bad about the fire and loss. I have a large black hole in my workbench to remind me about the dangers of charging Lipo's. It is my experience that series chargers with auto detection of no of cells can't tell the difference between a fully charged 2 cell battery and a discharged 3 cell. My problem began when I didn't check the read out to check on no of cells and I let it run. Anyway, when you try to charge a 2 cell battery up to 12.4 volts or so they get hot and the rest becomes history. The only solution I have found is to use a parallel balancing charger. Since then I have never had a problem or even come close to one. I find the parallel charger to charge slower than the series one so it is not so convienient at the field. Now I always remove the battery from the model and I build the model so this is an easy operation and I use the series charger at the field. At home I put the battery on a ceramic plate and then place a flower pot upside down over it. This will contain any fire should it occur again. Safe charging to everyone. Peter
Posted on: 5/6/2010 11:29 AM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=9714673

RE: Seaplane Drake
Here is my plan for the 1/2A Drake. Peter
Posted on: 5/5/2010 1:57 PM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=9712577

RE: Seaplane Drake
Is your Drake Two the 1/2 A free flight version?
Posted on: 5/5/2010 1:42 PM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=9712539

RE: radio too
What a great looking little plane. Thanks for sharing it with us. Peter
Posted on: 5/3/2010 12:27 PM by Author "PeterC" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=9706944

RE: 1/2 A Pacer mods
I have to agree with MJD. My old Mach None which was a second generation Pacer flew great with a Tee Dee using old EK servos (2) and an old EK radio. I can't think why I would want to change the design. If you're up to that type of plane then it's great as it is. I think the weight of a Enya would make it a slug. My last one was el*ctr*c powered with a BP 21 and a 1250 mah 3 cell lipo and was just as good as the Tee Dee. If you go with wing mounted servos be sure to put a skid under it to protect the servos. Peter
Posted on: 5/3/2010 12:25 PM by Author "PeterC" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=9706939

RE: Seaplane Drake
Give us some more clues. The only Drake I am aware of is the one by Ken Willard. Peter
Posted on: 4/30/2010 2:08 PM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=9700451

RE: Ace Aerocommander Shrike questions...
I did a conversion many years ago using two 6V speed 400 "can" motors and a 700 mah nicd pack. It flew fine but was a bit lethargic. Today I would use two of the brushless motors out of China with lipo's. You can dig through Hobby King's site to find the motors I am refering to. I think they are AX 1806 C's. I am sure that combination would bring it alive. An earlier one with two TD's flew great but it had a short but spectacular life (and death). Peter
Posted on: 4/14/2010 6:52 PM by Author "PeterC" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=9661124

RE: Airfoil explanation
Well, there is the possibility that they BOTH contribute to generating lift along with the plate effect of the lower surface of the wing. Peter
Posted on: 3/26/2010 1:02 PM by Author "PeterC" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=9613858

RE: Airfoil explanation
Back to airfoils. I havent seen any mention of Bernouli Effect or Coanda effect in explaining how airfoils generate lift. Peter
Posted on: 3/26/2010 12:38 PM by Author "PeterC" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=9613799

RE: I want a Schneider cup racer 60 size
A real nice set of floats can be bought from Sea Commander. These can be had with or without the mounting hardware. I have a set on my Schneider Sport 60. They are designed specifically for the Schneider series of planes and handle great in the water without water rudders. Peter
Posted on: 3/23/2010 5:11 PM by Author "PeterC" in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=9605857

RE: MRC single channel
Thanks for the quick reply Tommy. My operating system seems to be somewhat different in that the relay in the receiver operated the coil in the escapement which released the rubberband powered pawls on the operating arm which caused the torque rod to move the rudder. (whew). All from a single 2 cell battery pack. I see yours required a seperate battery pack to operate the servos, Well they are almost servos; perhaps I could install a booster battery in the system to assure proper voltage to the escapement? I do want to try the system in it's entirety which means I'll have to endure whatever the radio gods throw at me. Peter
Posted on: 3/18/2010 11:37 AM by Author "PeterC" in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=9592466