|02-19-2005, 09:07 PM||#1|
RCC Senior Contributor
I am: Bob S
Join Date: May 2004
Location: Beeton, Ontario
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Servo question for my CAP
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I am in the middle of putting together my Hanger 9 quarter scale Cap 232 and I was wondering about the servos. How many oz.'s of torque should I have for the servos? Are the ailerons going to be less? Thanks for any info!
|02-20-2005, 12:27 AM||#2|
RCC Supreme Contributor
I am: Gary M.
Join Date: Jul 2003
Location: Stoney Creek, Ontario
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Re: Servo question for my CAP
A couple of year ago I had a Sig Cap 231 ex and I used Hitec HS605BB servos which are rated at 76 in oz of torque and never had a problem with these servos. I flew this plane in competition Scale Aerobatics and the plane performed flawlessly. Too bad I couldn't say the same for the pilot..LOL!
As far as using lesser servos on the ailerons, my new plane is a Dave Patrick Edge 540T and in the manual, Dave says that in considering servos, that actually you should use servos with a bit "more" power on the ailerons due to the large surface of the ailerons.
In line of priority he listed it this way in considering servos:
I always thought that the rudder should have the strongest servo due to the fact that it is a large area surface but also it is used for ground control of the plane (stearing) but not according to most of the guys who fly larger planes. If your going to or want to use different servos for different control surfaces, then the ailerons should have the better servos, then the rudder, and so on.
In considering the ailerons No.1 priority, you will find that most of the larger planes, say some 1/4 scale and 27% scale and above, will use two servos per aileron. On the DP Edge for example which is 27% scale, there are two servo bays per aileron to not only have more power but to distribute the force over the whole aileron more evenly.
Two servos per aileron is not needed on this plane though! And if you use servos in the range that I used, as noted above, then I would use the same servos for the rudder and elevtors as well. Another thing that Dave says that makes sense, is that there is no such thing as too much power when considering servos and that you should alway buy the best servos that you can afford. You have to be reasonable though. I wouldn't use a Coreless Digital Dual Ball Bearing servo with 240 in oz of torque in a 63" Goldburg Eagle II Trainer nor would I use Standard Servos with no bearings and 43 in oz of torque in a 33% scale plane either because you figure thats all that you can afford!
The only other thing I would highly recommend is that many guys will just use any old standard servo on the throttle. They rationalize that it not good enough for the other controls but it will do for the throttle. As far as I am concerned, and I believe others who are serious about how their plane handles, will use a good quality servo on the throttle as well.
In competition for example, good throttle management is just as important as any other control on the plane and the throttle is being continually adjusted while performing various manovers. You want a servo that is precise, quick to respond and accurate in control. It can mean the difference in performing a manover well or badly!
In the DP Edge, I will be using 4 digital servos for the ailerons, 2 digitals for the elevators and one high torque digital servo for the rudder. On the throttle, I will be using a digital BB servo with 61in oz of torque and 16 m/s speed. It may be considered a bit over kill but I am using the best servos I can on all other surfaces, so why put a cheepie old standard slow, inaccurate, sloppy servo on the throttle. It doesn't make sense to me considering how important precise and accurate throttle managment really is.
Hope this helps.
Stoney Creek Hawks RC
MAAC No. 43659
Radios used: Spektrum DX6i
Current builds: 1/4 scale J3 Cub & Neiuport 17 and KMP B-25.
Currently flying: Scratched Tele 40, Parkzone Stryker & 60" SPAD Debonaire
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