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Elevator Trim Control Horn

 
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mozart1(at)ctemail.net.au
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PostPosted: Wed Sep 19, 2012 4:45 am    Post subject: Elevator Trim Control Horn Reply with quote
Gents

I’m building Lightning # 143 and struggle with a little thing.
Could somebody tell me what the elevator trim deflection should be?
From the manual it should be 30deg down but how much is it up?
The trim servo has a travel of 17mm with my trim tap cut to the manual measurements it is not possible to a have a control horn similar to the one in the manual and deflection +- of 30deg.
As by my calculation, if the pushrod attach point would be on the bottom skin of the trim tap the travel of the servo is still not enough for +- 30deg. My Trim tap is at the trailing edge 15mm thick => requires 10mm travel for 30deg if attached on the bottom skin.
So what is the solution? The next servo up with 26mm travel would work? Or is only a down travel required? I guess also a very short control horn is not very stable as the angel of control is very low (I would have on my RC model plane bigger horns then on the full size) if this makes sense?

Any ideas very appreciated thanks

Michael
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vettin74(at)yahoo.com
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PostPosted: Wed Sep 26, 2012 3:37 pm    Post subject: Elevator Trim Control Horn Reply with quote
When i get into the shop tommorow i will measure the deflection down from the tip of the elevator. That may proove to be a better dimension. The only issue with making the input hole closer to the tab hinge line is the sensetivity of the trim tab than. I would suggest not moving the horn closer than already shown. Very little movement by the motor will givr a bigger deflection and that is not what you want. We measure the deflection from the top skin, check the the tab has 30 degrees travel for clearance, the tab movement installed will be less.
Nick

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On Sep 19, 2012, at 7:45 AM, "MP" <[url=mailto:mozart1(at)ctemail.net.au]mozart1(at)ctemail.net.au (mozart1(at)ctemail.net.au)[/url]> wrote:

Quote:

Gents

I’m building Lightning # 143 and struggle with a little thing.
Could somebody tell me what the elevator trim deflection should be?
From the manual it should be 30deg down but how much is it up?
The trim servo has a travel of 17mm with my trim tap cut to the manual measurements it is not possible to a have a control horn similar to the one in the manual and deflection +- of 30deg.
As by my calculation, if the pushrod attach point would be on the bottom skin of the trim tap the travel of the servo is still not enough for +- 30deg. My Trim tap is at the trailing edge 15mm thick => requires 10mm travel for 30deg if attached on the bottom skin.
So what is the solution? The next servo up with 26mm travel would work? Or is only a down travel required? I guess also a very short control horn is not very stable as the angel of control is very low (I would have on my RC model plane bigger horns then on the full size) if this makes sense?

Any ideas very appreciated thanks

Michael
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stephenbehn(at)bigpond.co
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PostPosted: Wed Oct 03, 2012 2:35 am    Post subject: Elevator Trim Control Horn Reply with quote
Nick,
I have also had the same struggle as Michael with the trim tab deflection and would appreciate actual measurements of its required deflection. I have decreased the length of the horn to get the required 30 degrees in the manual and have obviously increased its sensitivity which you are concerned about, I will have to re do this and an actual deflection measurement up and down would add peace of mind.
Regards
Steve Behn
lightning 69
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