Re: Trim system
Posted: Tue Aug 22, 2023 7:57 am
daleandee wrote:Panther16 wrote:Every thing you put in the a/c along with fuel burn moves the the cg aft. 4 turns up gives 70 on final and any from 3 -4 turns in cruise depending on speed. I suspect you may have the same issue if are using a corvair and don’t add some weight in the tail.
My Odyssey is in the tail of my Corvair powered taildragger for CG reasons. With full fuel and no baggage a single pilot needs to be at least 180 lbs. But there is no loading scenario (within reason) that takes the CG out of the rear limit.
I have the conventional tail on a Model-A with the original trim lever. At approach speeds with 20º flaps setting I can use full up trim and all is well. Using 30º flap on final causes the need for the slightest touch of back-stick pressure. Some have suggested a slightly larger trim tab but I stayed with the plans. Here's what it looks like:
Glad to hear from you on the board. I posted another message on one of your youtube vids, but obviously, I didn't want you to put out any real info on that. Unfortunately, the y-tail can't use a regular trim tab, and I'm stuck with the dial-a-trim system.
Because of the Corvair weight, I also mounted my battery behind the spar to hep with CG. For convenience, I put it on the pilot side, just behind the seat. That way I can just pull the hinge pin, and get to it. Eventually, I figured I will make a cargo pan out of thin aluminum to keep it all safe. How far back is yours? I saw pics of a battery literally behind the rudder hinge.
Just so I can share.... her's a pic my panel I've been working on.