I am having a bit of trouble with my plane as I find it hard to set up the servo properly in it for the throttle

I cant seem to set it up so it idles lower enough as the trims affect the high speed setting aswell.

Can someone give us an example of how they go about setting up their throttle servo

Thanks alot

Tim

What kind of radio ??... trim should not affect end points...only the center point.

Set your throttle trim down as far as you can. Then, close the carb all the way shut.(you may have to turn out the idle-stop screw so the carb can close all the way)
I use a Du-bro easy connector on the throttle rod so adjustment is easy with an Allen wrench. Tighten up the rod so the carb is closed when the servo arm is all the way back. (throttle stick and trim all the way back) Now, open throttle all the way and the barrel should be open on the carb. (if you're in the correct hole in the servo arms) Thats it! Ross

Is your radio an older type with no end point adjustment for the throttle servo?

If it is & that's the problem let me know & I'll explain exactly how to fix it. - John.

Hi

Its an MC 12 graupner

It seems that the throttle trim also moves the end point when I have WOT.

Thanks

tim

I googled the radio & it's an all singing, all dancing radio, nothing basic about it.

By coincidence I was given a bunch of old magazines & one has a review on the MC-10. The review mentions something that may be a help.

'Sub trim needs some explanation here. In this instance it serves exactly the same purpose as the stick trims but has greater range (plus or minus 70% of normal travel compared with about 10% for the stick trim).

They both move the travel limits (end points) as well as the centre. If you use too much sub trim you will find that you will severely limit the opposite stick movement. It's worth pointing out here that on most JR sets , the stick trim doesn't move the end points.'

Basically tells you what you already know. - John.

What you have is a clever radio with a dumb feature. Get yourself a Dubro servo saver

http://www.shopatron.com/product/part_number=120/101.0

Set it up as shown in the drawing with the springs just at the forward end of the servo arm & just one of the collars at the back. You have to move the linkages in or out of the servo or throttle arm to match the servo travel as best you can.

Once it's all set up back off the idle stop screw on your engine so the throttle can close completely. With your radio stick right back & the trim down adjust the rear collar so the servo holds the throttle pushrod right back closing the throttle. Tighten it up.

Leaving the trim down push the throttle stick all the way forward. Move the front collar back until the springs hold the throttle wide open plus a little spring tension. Tighten the front collar up.

Now check that the throttle stick opens the throttle from fully open (& compressing the spring slightly) to fully shut without stalling the servo.

With the throttle stick fully back move the trim lever forward, the throttle should now be open a little, probably a fast idle setting. Now push the throttle fully forward. The throttle should open fully & any extra movement will be taken up by the spring.

Hope this helps, John.

Thats Great John Thanks alot for the reply!!!

I seem to of never had a problem when I was using the old sets ie Sanwa Excellence, Sky leader etc

Ill give it a try and let you know how i go

Thanks

again

Tim

Originally Posted by Boomerang1

What you have is a clever radio with a dumb feature. Get yourself a Dubro servo saver

http://www.shopatron.com/product/part_number=120/101.0

Set it up as shown in the drawing with the springs just at the forward end of the servo arm & just one of the collars at the back. You have to move the linkages in or out of the servo or throttle arm to match the servo travel as best you can.

Once it's all set up back off the idle stop screw on your engine so the throttle can close completely. With your radio stick right back & the trim down adjust the rear collar so the servo holds the throttle pushrod right back closing the throttle. Tighten it up.

Leaving the trim down push the throttle stick all the way forward. Move the front collar back until the springs hold the throttle wide open plus a little spring tension. Tighten the front collar up.

Now check that the throttle stick opens the throttle from fully open (& compressing the spring slightly) to fully shut without stalling the servo.

With the throttle stick fully back move the trim lever forward, the throttle should now be open a little, probably a fast idle setting. Now push the throttle fully forward. The throttle should open fully & any extra movement will be taken up by the spring.

Hope this helps, John.

Hi John

I have used your system and it really works well thanks alot.

In the mean time I have bought a 9ZAP so hence my other thread on how do i set up the throttle servo.

Thanks

tim

Glad to hear it all worked out.

Of course, with the new radio you can achieve the same thing by simply pushing buttons! - John