[chris p]

what servos is everyone useing in thier 35 and 40% models (yes will be 3d)

that would be 2 per wing half,1 for elevator half ,2 fpr rudder.?

chris

[bigguy]

Hitec 5955's,Hitec 7955's and JR 8711 are the ones I see and use.

[chris p]

would 5645 be enough for ailerons??

[3dflyer]

5645,s get sloppy and i would not use them for a 35% plane if you plan to 3d it.if your gonna invest that kind of money ,your better off spending a bit more on good quality servo,s.i had 5645,s on my first 33% plane and they became sloppy after the first season and i fly 3d.
just spend the extra money and buy good quality servos if your budget will allow.you won,t regret it.just my 2 cnts.

[SJrcflyer]

Can't agree more with Marc. At that size your paying lots of $$, why risk the plane and sacrifice performance with cheap servos. If your gonna do it, might as well do it right and go all the way. 5955's, 7955's, 8711's etc.

Chris

[Wheels_78]

Originally Posted by chris p

would 5645 be enough for ailerons??

Just another guys opinion here man, but to me it's going to depend on how many servos per serface you're going to use. I'm flying pau 43% edge currently, with 6 5645s on the ailerons, 3 each. Flown all this season, no problems.

People flew giant scale planes long before you could buy 400oz*in servos, just use your head, if a models manual calls for hi torque servos, supply them, but is there a huge advantage to putting a 300oz servo where I 150oz is called for? I don't think so.

Giant scale aircraft are just like any other high dollar hobby us guys get into, no matter what equipment you use someone's going to tell you it's not good enough. Set your airplane how you want to, follow manufacturer guidelines, and use your head (throttle back when the nose is down) and you won't have problems.

[chris p]

well im debating onuseing the 5645 x 2 on each aileron.
the elevator i know i need new servos, and will proble go with 7955 on each half

[RAMJET]

remember the servo linkage is just as important as the servo .you can multiply the amount of slop in a servo or kill it's power with a poor setup .use a combination of the longest arms possible to achive your goal and minimize slop. example (1"servo arm into a 1.5" controll horn will have more than twice the slop of a 2" servo arm into a 2.5" controll horn and both will achieve the same throw) never setup for more throw than you use as this takes away from the power of the servo.I am with wheels 78 on the power of the aileron servos, on most planes little is needed, I also find little differance with high resolution servos on ailerons or any controll surface with small throws .but on the tail of a big plane with huge 3D throws you just can't beat the 7955/7950
never had mutch problem with slop in the 5645 and I have had them in a plane for 2 years but they are very slow .I don't like 8711 as they will slop up fast and jitter like crazy .Roger

[Wheels_78]

Originally Posted by chris p

well im debating onuseing the 5645 x 2 on each aileron.
the elevator i know i need new servos, and will proble go with 7955 on each half

It might help if you were a little more specific, there's a fairly big difference between 35% and 40% class airplanes and their requirements. I don't like the idea of 2 servos on ANY 40% wing, no matter what the power is. A 40%+ aileron is LONG and with only two points being held steady I worry about flutter induced by aileron flexing. A 35% on the other hand, I think 2 5645s per aileron would work.

[Tyler P]

I was researching getting a 35% plane awhile ago. I honestly wouldn't do less than 2 HS9785 per aileron, especially if you want to 3D it. You want to have some speed on the controls, and the 5645 is a fair bit slower than the 9785.

For the tail, definitely go with 7955s or 7950s. They'll give you the torque you need.

For that size of an investment, don't cheap out on servos. I don't think your 5645s would likely fail, but they'll be slow to react, and you want to be able to have full control of all your surfaces when YOU want it, not when your slow servo decides to move. It completely changes the way you fly.

This comes from years of racing RC cars. Slow servos are no good for any type of performance driving, and now that I'm flying 3D, slow servos wouldn't do it for me flying.