---------------------------------------------------------- Lightning-List Digest Archive --- Total Messages Posted Wed 09/26/12: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:37 PM - Re: Elevator Trim Control Horn (Nick Otterback) ________________________________ Message 1 _____________________________________ Time: 04:37:13 PM PST US From: Nick Otterback Subject: Re: Lightning-List: 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" 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 > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lightning-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Lightning-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lightning-list Browse Digests http://www.matronics.com/digest/lightning-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.