Ok,
I'm getting a little neurotic at this point trying to get the best servo geometry on my Jet Legend F-15. I'm using JR 3421's The lowest I can go on the servo arm is about three holes up on the JR arm to get the required throw and that causes me to bring my end points down to about 70%. Any lower on the arm and the clevis binds on the servo hatch. The horn is the standard fiberglass with one hole. If the servo was a 100+oz/in servo, I wouldn't be so concerned but the 3421 is about 75 @ 6.0 volts which is what I plan to run. Just curious if others have ran into this problem particularly with the F-15. I realize the ailerons are pretty small and the F-15 ain't no speed demon but I'm just not sure if the setup is good enough for the mini servos. Thanks.

Marty

I fly mine with the same set up, powered with a Jet Central Super Eagle, fly the piss out of it and have about 100 flights on it so far with great results. You will be surprised that even though the ailerons are small...it does not take much deflection to roll it around.

Also, mine is pretty fast for what it is (150 MPH) so it ain't that slow.

Beave

If you are not happy with the aileron roll rate, you can mix the ailerons with the elevetors to act as tailerons (of course you will use two channels for the elev). We fly out F18's that way and it works great!!!

My concern is not about the roll rate. I'm concerned about getting the max torque out of the servos and since the horn is not adjustable and fairly low to the control surface, the only other option is to go lower on the servo arm which is what we try and achieve all the time anyway. I was able to go lower after cutting away a bit more of the servo hatch slot towards the aileron and this got me to the high 80's to the low 90's on the endpoints. With cutting such a long wide slot on the hatch, I'm not comfortable with having the servo mounted to it and I'll mount it in the wing instead. I've already remade these hatches cause the JL ones were pretty flimsy glassed balsaI believe. Fine if you were mounting the servos in the wing but not mounting them to the hatch. More work and still not getting anywhere.

Marty