RE: LiPo fire mid-flight
Hi, Have you found out why it happened ?? Brian
Posted on: 5/20/2013 7:07 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11516989

RE: The new model from CPLR!
[quote]ORIGINAL: apereira It is Oxai, There is a small access cover where the rudder servo sits, just forward of the stab adjustment screw. The engine must be the new YS 185, and the most important detail not clearly seen in the picture is the ventral T canalizer with anhedral. He just flew it one day ago, and it's supposed to be very good, but not much details nor comparison to the Axiome+. It has an engine cowling on the bottom, not the ussual belly pan, so wing seems to be a two piece one. [/quote] Here is the other view ;
Posted on: 5/20/2013 3:39 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11516830

RE: Batteries running-in and swollen batteries
[quote]ORIGINAL: wagen017 Don't know, and I also wonder about the statement. Is it really about running in of packs or more of a safety approach where you observe if packs are stable? Volkert [/quote] Hi Volkert, I don't really know much about the internal workings of lipos or what is going on with them when new. I do know that there is something that happens in the first runs. When they are new (and it seems lying up for a while) they are a little dead/down on performance. They definitely improve with running - they seem to 'break in'. I have not measured this improvement but I would say they peak at 10 to 15 flights in. It stands to reason so that if they are 'stiff' when new they would heat more easily if pushed hard thus causing harm. The problem is that this harm does not show immediately. It will result in poor performance later on in the packs life and thus is difficult to relate to the initial runs. Brian
Posted on: 9/17/2012 3:02 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11230783

RE: 150 meter rule.
Hi, Just a cautionary note; G-Earth views can be quite oblique depending on patch location relative to the pass over track. Brian
Posted on: 9/14/2012 2:41 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11228077

RE: Splendor OXAI-Quique
Hi Bob, Looks like flaps/spoilers - see last photo above. Brian
Posted on: 9/12/2012 4:59 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11225930

RE: Futaba MC 9100A ESC
Hi, For your stall turns (and spins) set up the high rate rudder switch so that it brings in a condition with a change to the throttle curve so that you have a tick over - not brake. Or use dual rates on throttle,to do the same thing, using the same switch. Brian
Posted on: 9/10/2012 7:30 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11223640

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
yaw stability and incredible rudder power. I am also playing with turbulator strips- just started
Posted on: 9/7/2012 2:32 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11220437

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hi Brenner, I think replacing the flare with more area amounts to the same thing both in terms of the effectiveness and the resulting drag. Relative placement of side area needs to be considered in this. eg; if one likes a 27% CG it should also be at 27% of the side area or as close as is possible. The fuz,, is the flying surface in knife=edge and during rolls etc. Also I think the blunt fin LE in the pic,, may be playing a negative role. I'm not saying it should be razor sharp - just a nice section in proportion to it's size. Look forward to the web-site. Brian
Posted on: 9/5/2012 6:05 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11218126

RE: Ordered new batteries . . . we'll see . . .
Hi Jason, I'm sure the throttle will still work with this pack. Brian
Posted on: 8/31/2012 1:06 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11212337

RE: Ordered new batteries . . . we'll see . . .
Jason, You are missing a point. The extra capacity also gives extra performance, relatively speaking, as the flight progresses - less % capacity used = less voltage drop !! There is no trade off. I suggest you think it through a little more. Brian
Posted on: 8/30/2012 5:07 PM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11212041

RE: Ordered new batteries . . . we'll see . . .
in flight characteristics was minimal although power to weight ratio change could be felt as the fuel... loading. Also E power and IC are flying the same designs,mostly. There must be an optimum wing.../circle-roll combos. Today's power plants put out 10kg+ static thrust. Your 5000ah pack volt drop ,flight start to finish, is say 3.5 over an average of 38.5(no load). That's a 9% drop in power
Posted on: 8/30/2012 4:18 PM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11211993

RE: Ordered new batteries . . . we'll see . . .
[quote]ORIGINAL: Jason Arnold [quote]ORIGINAL: Niall [quote]ORIGINAL: Jason Arnold [quote]ORIGINAL: Niall They came as a 10S brick... [/quote] At 1300 grams you're not wrong in saying it's a brick! [&:] Cheers, Jason. [/quote] At 1300 grams for 5800 I'm willing to take the extra weight for the extra capacity. If you compare it to a standard 5000 its better value per gram. Plus I should be able to get to the end of the schedule with very little change in voltage and thus performance. I'm using this in an Asyuler, not sure if ill use these in comp flights but should make excellent practice packs with the ability to go round and try a few extra manouveres without the normal guilty feeling [:D] [/quote] You can argue it that way but IMHO you'd be better off practicing with what you're going to compete with. Running a heavier pack (150grams above normal) will make a difference in how the model flys. I don't really notice any great drop off in performance towards the end of a schedule with 5000mAh packs. Perhaps it just gets down to how you manage your throttle or your throttle curve set-up... Correct set-up of your throttle in the ESC and TX can make a huge difference to the smoothness and efficiency of your model. Cheers, Jason. [/quote] Hi Jason, You may not be able to notice the drop off but you can take it that - it does happen. The bigger the pack capacity to begin with the less it drops for any style or T curve etc. Rhino 4900 are 1250g that's a 50g difference. The IC guys have a 500g change during the flight and for the 2nd half of each flight they have a 500g to 300g weight moving 100mm approx !!. Brian
Posted on: 8/30/2012 5:00 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11211329

RE: Electric Vs Engine.
[quote]ORIGINAL: MTK Brian, You took the word ''mechanic'' literally. A better word is ''craftsman'', not just a simple assembler [/quote] Hi Matt, I did ,sort of anyway. The idea of a really big version of the YS came to me some time ago. They just keep on getting bigger, and as engines go they are just about as rough running as it gets. I just wanted to paint the picture of a really big one on the screen of a few minds. If someone did put a 750cc one in a bike I would hide behind a blast screen for the first throttle up [:D]. I really don't know why they don't balance them up a bit better. Brian
Posted on: 8/28/2012 3:56 PM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11208836

RE: Electric Vs Engine.
[quote]ORIGINAL: MTK I guess the point of all this back and forth banter is that one had better be a decent mechanic regardless of your choice in flavors. Alcohol, gasoline, electrons or rubber bands still need a pretty tight screw in front of the controls [/quote] Hi, Not really, but understanding what you are dealing with is the key with all of them. E power systems need a good install
Posted on: 8/26/2012 1:21 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11206194

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hi Spark, I see a bigger rudder flair in the pic,, with the bubbles. Which did you do first. Did you try toe in on the tail with no flair. Do you have a record of the sequence of changes and the effects they had - or - maybe you made several changes at the same time. Brian
Posted on: 8/22/2012 3:32 PM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11202535

RE: Electric Vs Engine.
Hi, Yes the results will go there when they are processed. Doesn't the web shrink the world. I don't know when the guys will do that. The last results in that chart are 7 weeks old. There is a couple of sets not up there yet. Brian
Posted on: 8/22/2012 11:22 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11202299

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hi Spark09, You wrote ; Quote; ' I modified my wings with winglets like the Wind S Pro GFK version the bubble tips these seem to work better than the flat ones used on the Oxai Citrin. I also have them on the tips of the stabilizer for rock solid flight in windy conditions. I also widened the TE of the rudder by almost 2 cm. ' I wonder is the 'bubble' actually giving a subtle 'toe in' effect ?? It is the only reason that I can see for it being noticeably better. Interesting !!? Brian
Posted on: 8/22/2012 4:18 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11201864

RE: Electric Vs Engine.
[quote]ORIGINAL: apereira Thank you SAB, that was the question, I got the results on Google already [/quote] Hi, Can you post a link please . Brian
Posted on: 8/22/2012 1:16 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11201786

RE: Electric Vs Engine.
Hi Matt, For the majority of people it is a sole en-devour. This is true for most 'team' members also. Only countries like the US and Japan send real mechanics. Without successful individuals most countries would struggle to put up a team. How much electric can benefit this remains to be seen. I think is is visible in our little country at this stage. Brian
Posted on: 8/21/2012 9:21 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11200918

RE: F3A Results - SPOILER
[quote]ORIGINAL: apereira Nope, ESC are three phase inverters but without the negative portion of the AC wave so it act like a half wave rectifier and still regulates the frequency as the motor works on magnetic rotating field theory, and that is why old ESC which were low frequency could not reach the power todays highfrequency ESC's, they are DC so the ESC can regulate the power
Posted on: 8/16/2012 5:26 PM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11196253

RE: New TP Battery for F3A
[quote]ORIGINAL: smcharg Guys, Chris does have 5S 35C 4500 packs that are 1/2 the price of Thunder Power packs.  The weight is 560g per 5S pack.  Additionally, his 4900MAH 25C 5S packs are still very good and much cheaper still than Thunder Power.  I have owned 5 sets of these packs... with Thunder Power at all except their prices compared to everyone else.  They can make some light
Posted on: 8/16/2012 7:41 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11195674

RE: F3A Results - SPOILER
' They are brushless DC, our motors are not AC induction motors, which would be more typical of industrial large motors. http://en.wikipedia.org/wiki/Brushless_DC_electric_motor All the motors we use operate on that principle, and are all essentially the same with the exception of # turns, winding wire, #poles (which dictates #magnets) and physical size. Someone can correct me if I got it incorrect. _____________________________ Chad Northeast ' [quote]ORIGINAL: apereira You are correct in my opinion Chad, The confusion comes from the fact that our brushless motors run on DC with AC type of winding, but they are DC for sure. Regards [/quote] Hi, Missed this. The guy who asked is correct ; The motors we use are AC with permanent magnets . The wiki link Chad posted explains it very well. Our ESC's are mini inverters/electronic controllers. Brian
Posted on: 8/16/2012 6:40 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11195614

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
[quote]ORIGINAL: Brenner Great pictures! The narrow fuselage on my Wind S Pro also works well with the Contra. Based on my experience with my Wind S Pro, my thinking is that a narrow fuselage allows the rudder fin to be more effective, whereas a large profile fuselage masks the rudder fin. which reduces it's effectiveness, and using a Contra Drive shows this effect up because straightening the airflow over the fuselage makes the the fuselage more effective as a lifting surface, which compensates for reduced side area. The net result is more lift from the fuselage, more yaw stability from the rudder fin, and reduced parasitic drag, which is no longer needed for controlling speed on downlines because of the increased braking that you get from the Contra. Brenner ... [/quote] Hi Brenner, I agree completely with your narrow fuz,, observation. A new design could be even more narrow/less wide ?? - I think a bulbous LE on the fin may also be an issue, as it may be 'masking' the rest of the fin/rudder. I hope Bryan Hebert is tuned in to all the contributions here. Brian
Posted on: 8/16/2012 4:04 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11195509

RE: New TP Battery for F3A
' Hi Jason, It is 4950 grams weighted on the FAI scale at the EC. I use TP 4400 batteries wich are 1010 grams. Wolfgang Matt was flying the new TP 4700 packs and they where 150 gram lighter than the TP 5000 batteries as he told us. ' (Quote from another thread.) Seems like they granted my wish !! :). Has anybody got any more detail ?? Brian
Posted on: 8/16/2012 3:55 AM by Author "serious power" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11195506

RE: 2102 FAI/F3A EUROPEAN CHAMPIONSHIP
Hi, The smile on that young mans face says a lot more than any long post ever will. Brian
Posted on: 8/16/2012 3:21 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11195485

RE: 2102 FAI/F3A EUROPEAN CHAMPIONSHIP
[quote]ORIGINAL: Reko [quote]ORIGINAL: serious power Hi J-P, Have you any idea why Sweden were not there ?? Brian [/quote] Huh…. That was a surprising question to find here. I’m glad someone misses the Swedes =) I would say all “veteran� team members have been occupied in one way or the other, and no rookies willing to do the expense and effort of going. We will be back though. Personally
Posted on: 8/16/2012 1:28 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11195441

RE: 2102 FAI/F3A EUROPEAN CHAMPIONSHIP
Hi J-P, Have you any idea why Sweden were not there ?? Brian
Posted on: 8/15/2012 1:38 PM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11194725

RE: 2102 FAI/F3A EUROPEAN CHAMPIONSHIP
Hi Doug, Well put. He is a very warm and humble guy. No arrogance or ego what so ever. He really does share his knowledge willingly and is consistent in what he says. It is easier to be that way when you tell it how it is. He answers questions in a very matter of fact way - I've never heard him being vague or evasive - he is pretty grown up about that stuff really. I'd say he is asked a lot of questions. Brian.
Posted on: 8/15/2012 11:39 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11194556

RE: F3A Results - SPOILER
Hi Doug, Very true. However the K's are multipliers. There is tho 0 to 10 range as well. So getting a high mark is more difficult for everyone with the more complex maneuvers, and equally so. Take gymnastics ,as seen in the last two weeks, as an example. They have a difficulty rating system ,like our K's (and similar in scope too), but it's additive. So in that a mark of 8 with a difficulty of 6 = a score of 14 points. I'm not sure which is better or worse - I think ours is better. Brian
Posted on: 8/13/2012 11:09 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11191758

RE: F3A Results - SPOILER
Hi J-P, Thanks. I assume the code will be updated/modified to reflect this. Even 70 is on the high side. Just being unknown makes them difficult for pilots and judges. Brian
Posted on: 8/13/2012 1:26 AM by Author "serious power" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11191260