The elevator trim on My Sonerai II is so small that it does not trim the airrcraft for 2 up. My flight advisior insisted that I create a Horizontal Stab trim system. I used a Jabiru flap actuator through a 100/1 bellcrank to reduce the travel. I have a drawing somewhere. Photos attached. It has a POwer on Sw and direction switch. Even at 100/1 if you operate it in flight there is a "bumP" which will likely improve your prayer life. You see 2 vertical rods. One is attachment the other is a damper which eliminates play. BillEThis is an old thread but wondering if anybody has followed up, finished, of tried out any trim systems mounted in the lower fuse area. As mush as I have tried to fold lil cardboard cutout designs into the upper space none have been spectacular or accessible after install.
I don’t want to cut my fabric, and I like the ease of inspection and maintenance from the lower area after the access plate is off.
Any further developments?
I like the simple design of this and weight savings but again this would require removing the fabric and servicing it would be very difficult as well.Here is an option that actually weighs less than the original fixed installation. The weight savings comes because the original cross tube is removed while the jackscrew is anchored to the leading edge of the vertical tail.
https://www.sonerai.net/threads/chuckers-sonerai-ii-minus.4109/page-2
My Sonerai II LS has both an Elevator trim Tab on the left elevator. Its operated by a cable ina tube. The control lever is below the throttle, left side. of Pilot.Has anyone made a actual trim tab instead of the jack screw design?
I'd like to see your set up even in the Cockpit. [email protected]My Sonerai II LS has both an Elevator trim Tab on the left elevator. Its operated by a cable ina tube. The control lever is below the throttle, left side. of Pilot.
The Tab is maybe 1 foot wide and 3-4" Long. It pivots on a piano hinge. The rub is that when you adjust the travel for solo flight then take a passenger the travel is not enough to trim for a pax. It needs to be bigger, say 4" long by 16-18" " wide. (my guess) That change is a Major modification.
Send me your email of cell number and I can take a photo or 2 and send them.
BillE
Can you send me the drawings of yours?Scott’s trim system is a copy of the design i came up with for my airplane. The jackscrew is a piece of 1/2” all-thread rod that is fixed to the stab leading edge with a bent 4130 bracket. The jackscrew moves up and down in a threaded fitting mounted in the pulley which is sandwiched between two bushings. The bushings are mounted in two 4130 triangular plates that are bolted to the original stab mounting bushings in the fuselage. I have drawings if anyone is interested.
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