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1. 04:37 PM - Re: Elevator Trim Control Horn (Nick Otterback)
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Subject: | Re: Elevator Trim Control Horn |
When i get into the shop tommorow i will measure the deflection down from th
e tip of the elevator. That may proove to be a better dimension. The only is
sue with making the input hole closer to the tab hinge line is the sensetivi
ty of the trim tab than. I would suggest not moving the horn closer than alr
eady shown. Very little movement by the motor will givr a bigger deflection a
nd that is not what you want. We measure the deflection from the top skin, c
heck the the tab has 30 degrees travel for clearance, the tab movement insta
lled will be less.
Nick
Sent from my pocket
On Sep 19, 2012, at 7:45 AM, "MP" <mozart1@ctemail.net.au> wrote:
> Gents
>
>
>
> I=99m building Lightning # 143 and struggle with a little thing.
>
> Could somebody tell me what the elevator trim deflection should be?
>
> =46rom 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 mea
surements it is not possible to a have a control horn similar to the one in t
he manual and deflection +- of 30deg.
>
> As by my calculation, if the pushrod attach point would be on the bottom s
kin 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 f
or 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 n
ot very stable as the angel of control is very low (I would have on my RC mo
del plane bigger horns then on the full size) if this makes sense?
>
>
>
> Any ideas very appreciated thanks
>
>
>
> Michael
>
>
>
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