U Can Do 3d Arf
 

Please help! I'm looking for suggestions on which HI=TECH sevos to use where on this 3D ARF, that I plan to power with a YZ 91FZ. Thanks, Charlie.

UCD information
 

Look at the thread in this forum with almost 40 thousand views and many pages of information. Already answered there. I am personally using the 5 pole model 545's on all except rudder which has a JR 4721 coreless @ 119 oz/in
EXCAP232

U Can Do 3d Arf
 

Charlie,

We had two of them flying in Chico today. You should come down the hill and see them. I've got Hitec 525's on the ailerons and a 605 on the rudder. I currently have Futaba 3004's on the elevators and throttle. The other 2 525's for the elevators haven't come in yet. Battery is a 6v 1700mAh NiCd. Also using a YS91FZ. Flies great, even in the wind today. I split the landing gear block today when a crosswind pushed it sideways on landing. Easy repair though.

Chris

U Can Do 3d Arf
 

Futaba 3001 all around with a Hitec 5925 on the rudder (all running on a 6v 1450mah pack)!

The 5925 is a very fast servo, it's my first Hitec digital, and I've very impressed.

-Chris

U Can Do 3d Arf
 

5625 on ailerons and elevators
5945 on rudder

I got the digital servos for the centering torque, not so much for the deflection torque. You only need about 60 oz-inch for elevators/ailerons and 100 for rudder, since elevators and rudder are counter balanced. Especiall because the elevators are extremely counter-balanced, it's easy to have flutter if the centering torque is not enough. Seeing several people reporting the stab break due to flutter, I went for the digital servos.

One thing I suspect why some people broke the stab is that they push the elevators more than they physicall want to move: hinge lines too tight, edge bevel is not enough... When you push the elevators beyond the limit, you will flex the push-rod and/or strain the stab. So if you want to exceed the control throw, leave a wider hinge gap, which may cause slow speed to suffer a little.

U Can Do 3d Arf
 

Tape the hinge gap if you leave it open! That can cause flutter for sure...

-Chris