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Old 10-18-2019, 04:59 PM   #1
NEW222
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Control Throw Deflection


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While setting up my trainer, I have already set up my controls. I went to measure them and they are less than the 'normal' throws given in the instructions. So with that said, is it alright to move the clevis on the control horns closer to the control surface? I hear different opinions on doing such, however, it is the only way I can get the throws mentioned. Also to note, the servo wheels/horns and control horns installed are the same dimensions and types shown on the plans if this makes a difference. I was going to get new smaller control horns, then realized it would be just the same as moving them up one or two holes if need be. So is there something else I am missing here, or is it just one of the joys of setting up a model?

Also, I am currently working on building a control throw meter/gauge to measure by degrees also, and am hoping it will be more accurate than trying to hold a ruler in place.

Thanks.
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Old 10-18-2019, 05:26 PM   #2
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Re: Control Throw Deflection

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Originally Posted by NEW222 View Post
While setting up my trainer, I have already set up my controls. I went to measure them and they are less than the 'normal' throws given in the instructions. So with that said, is it alright to move the clevis on the control horns closer to the control surface? I hear different opinions on doing such, however, it is the only way I can get the throws mentioned.Move them closer if you wish, should be no harm in doing that on a trainer even with standard servos.

I was going to get new smaller control horns, You will need longer horns on the servo, not smaller, so the outside has more movement at full deflection

Thanks.
Hope my answers in Red above helps you out somewhat.
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Old 10-18-2019, 05:40 PM   #3
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Re: Control Throw Deflection

Thank you. Just to clarify the second paragraph of the smaller horns. The ones I was going to replace were those on the control surfaces, not on the servos. Sorry for any confusion. Regardless, you had answered my question though. Thanks again.
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Old 10-18-2019, 06:58 PM   #4
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Re: Control Throw Deflection

Some radios, Spektrum for one, allow you to increase the control throws above 100%. You can find this in the servo menu with Spektrum.
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Old 10-18-2019, 07:33 PM   #5
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Re: Control Throw Deflection

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Originally Posted by Terry Gauvin View Post
Some radios, Spektrum for one, allow you to increase the control throws above 100%. You can find this in the servo menu with Spektrum.
But would that be hard on the servos?
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Old 10-19-2019, 12:00 AM   #6
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Re: Control Throw Deflection

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But would that be hard on the servos?
No. Maybe 100% on the radio isnít 100% of the actual distance the surface can move. You can always adjust the radio until you get maximum deflection, then back off the radio percentage by a few, so no jamming can occur.

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Old 10-19-2019, 12:47 AM   #7
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Re: Control Throw Deflection

Thank you.
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Old 10-19-2019, 08:46 AM   #8
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Re: Control Throw Deflection

You have different options such as moving it out on the servo arm, (or mounting longer arms) or as you mentioned, moving it in on the control surface horn, Either will give more surface deflection for the same servo swing amount.

Having said that, more info will help determine the best solution.

What type of plane? High wing, etc?

Does this have one or two aileron servos?

How many channels does your radio have?

Asking as you can possibly modify your setup to have each aileron on its own servo and radio channel. That way you can tailor the amount of deflection each way to counter adverse yaw.

If not there are ways to get that same effect using simple geometry.

Note that programmable radio systems will offer options such as dual rates and expo. First allows you to set max control deflection for max stick throw and will have at least two separate and distinct allowances.

I bring this up since if active it can reduce the servo output amount and create the problem you are trying to fix here.

Expo sets the amount of servo deflection for stick deflection around neutral. This can increase or decrease the deflection, (I usually set it to decrease) for a specific stick deflection to help calm things down.

Mind you, full stick deflection still gives full control movement so does what you want there.


ps. Finding a club and instructor would be recommended. If experienced they should be able to have a boo at everything to determine if airworthy and that includes control throws, as well as balance.
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Old 10-19-2019, 02:44 PM   #9
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Re: Control Throw Deflection

Plane is Top Flite Sierra 40 Trainer, high wing. One aileron servo on teh bottom of the wing. Radio is a DX6 G3.

As for finding a club and instructor, I do have both, but we will not meet till next spring. I have already talked to the instructor and he said he will look at it when we meet up. Plane is definately airworthy as I got it from a friend, just that I have not had to worry about setting something like this up before as all my others were small homade foamies. Balance right now is just a hair nose down, but I am awaiting a 5 cell Nimh battery and it should then be perfect without any added weight. Thank you.
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