701 trim tab function

On my 701 I always have alot of nose up trim to neutrilize the stick.In the pictures of the plane in flight the elevator apears to be level on the top.I could put a simple indicator in the cockpit to check this in flight. Is the trim just holding up the unbalanced weight if the elevator? If so I could add a bungee to reduce this and get rid of the drag from the deflected trim. If it is actually trim should I just adjust the angle of the horizontal stabilizer slightly?

Scott Ehni

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Permalink Reply by Joe Spencer on February 20, 2011 at 10:33pm

Hi Scott

Before adjusting the angle of incidence of the stabilizer(maybe a last resort) consider drilling out the rivets in the trailing edge of the elevator and rebending it to take care of your trim probs. Then rerivet( I used the next size bigger rivet). The trailing edge is a convenient trim tab. I had to do that on mine; as recommended by the Zenith tech guys; if I remember correctly. It's been a while. I think there is a newsletter article from way back on doing that; written by CH.

Very cool plane you got there

Permalink Reply by Shay King on February 21, 2011 at 10:13am

Scott,

Where did the CofG come out on the airplane?

 

Regards,

Shay.

Permalink Reply by Ron D Leclerc on March 4, 2011 at 2:27pm

Hey Joe...Here is that article... it should be re-published again!  I asked Jon Croke to do that 3 months ago and nothing has happened at all!  Zenith should nev updated their 701 drawings when they changed to the 912 engine. There are a lot of builders flying around with that problem and they don't know it.

Joe send me your email address!

Ron

 

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Permalink Reply by Scott Ehni on February 21, 2011 at 3:50pm

That is a thought.The CG is in the center and the horizontal stab is set up acording to the prints.

Thanks to all for the ideas.

Scott

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