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Old 04-23-2012, 09:13 PM
raflyer is offline
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40% Build questions

Got a few questions for the experts on my first 40% build. Note: This is being built for IMAC and not Extreme 3D flying.

1) Do you guys put weights in the counter balance tab on the elevators? I would think it would help the servo/servo's on the elevators. The real planes do this to prevent flutter. I am only going to run one servo per elevator half. Was thinking it would help?

2) Would 1" control arms on the servo give me enough throw for IMAC flying?

3) For you guys who remove the stab's every time between flights, are you using stock connectors for servo's? They holding up ok?

4) You making your own extensions for the servo's or buying them. Concerned about multiple connectors becoming choke/failure points.

Thanks for the input!
Rob
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Old 04-23-2012, 09:26 PM
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Quote:
Originally Posted by raflyer View Post
Got a few questions for the experts on my first 40% build. Note: This is being built for IMAC and not Extreme 3D flying.

1) Do you guys put weights in the counter balance tab on the elevators? I would think it would help the servo/servo's on the elevators. The real planes do this to prevent flutter. I am only going to run one servo per elevator half. Was thinking it would help?

I have never put weights in, and I don't know any one that has.

2) Would 1" control arms on the servo give me enough throw for IMAC flying?
Depends on your final throw. 1x1 resolution seems like overkill now hat servos are so powerful.
But the most resolution per throw you need is the best way to go for IMAC.


3) For you guys who remove the stab's every time between flights, are you using stock connectors for servo's? They holding up ok?
100's of removals, attachments no issues.

4) You making your own extensions for the servo's or buying them. Concerned about multiple connectors becoming choke/failure points.
Making them takes time, but exact size = AWESOME!


Thanks for the input!

Rob
see above
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Old 04-23-2012, 09:33 PM
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Cool thanks! I planed on making my own extensions and good to hear the stock connectors are holding up. Still wondering on the balance on the elevator's. Only down side would be some weight in the tail end of plane which is a LONG way back from the 0 datum point.
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Old 04-23-2012, 09:36 PM
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I wouldnt worry about balancing elevators.
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Old 04-23-2012, 09:41 PM
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Only thing that concerned me was I read where a guy had some flutter issues with one servo on an elevator. Who knows how fast he was going or what other important details were left but just something I read.
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Old 04-24-2012, 12:26 AM
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I have an SX with a single S9156 Futaba Digital on each elevator and WFO with a 3W 170 on L90K's..... no flutter....

no mass balance.....

if you have a 300+ oz*in torque servo and a stiff tail... oughta be OK
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Old 04-24-2012, 12:35 AM
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Servo linkage geometry has alot to do with flutter or no flutter.

I fly a 35% Carden 330S Extra at WFO and no problems. JR 8611a's, 1.25 arms and 2S lipo direct.
And a Dalton 42% Extra 300 with a 3W 157 and used JR 8711 and 8911's. Haven't flown on 8911's yet, but have over 300 flights on the 8711's and no issues. 1:1 geometry, now. It was set up before for mechanical advantage.
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Last edited by Bunky F. Knuckle; 04-24-2012 at 12:46 AM. Reason: another bird.
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Old 04-24-2012, 03:15 AM
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I have experimented with weights in the counter balance. Quite a lot of weight is required to balance these stabs out on a 40% plane. It would definetly reduce the load on the servos. But i didnt feel any performance change in the air, with weights and without. Battery consumption might have gone down a bit but i found that irrelavent. The question that could be asked is, by doing this can you get away with a less powerful servo hmmm. i dont know, didnt experiment with that either as i found it more of an academic question then a practical one. my 2 cents.

PS:- we use single servos for our 42% sbach on each elevator. We have not encountered any flutter issues at high speeds.
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Old 04-24-2012, 10:27 AM
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Sigh...really?
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HIGHLY recommend these for the wings...I also use them for battery connections too.

http://dreamworksrc.com/catalog/thun...c-174_175.html

or the Multiplex ones from TDRC

http://www.taildraggerrc.com/servos-...xtensions.html
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Old 04-25-2012, 06:01 PM
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Quote:
Originally Posted by boggintuff View Post
HIGHLY recommend these for the wings...I also use them for battery connections too.

http://dreamworksrc.com/catalog/thun...c-174_175.html

or the Multiplex ones from TDRC

http://www.taildraggerrc.com/servos-...xtensions.html
Very nice solution! Thanks!!
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Old 04-29-2012, 07:38 PM
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I agree with SleepyC!
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Old 04-29-2012, 07:51 PM
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1) no weights in elevators.

2) i use 1 inch arms on the ailerons and elevators on both my 40% cardens. I used a 2 inch arm for the push pull rudder but i use the 1.75 inch hole.

3) for the stab connections i use standard connectors but i use parsons clips for security.

4) tried making my own for custom length. Couldnt get the crimps to hold good. Now i order custom length extensions from radicalrc for servos and batterys.

Tony
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