Lightning-List Digest Archive

Wed 09/26/12


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 04:37 PM - Re: Elevator Trim Control Horn (Nick Otterback)
 
 
 


Message 1


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    Time: 04:37:13 PM PST US
    From: Nick Otterback <vettin74@yahoo.com>
    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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