Replies to This Discussion

Permalink Reply by Kevin Beriault on December 31, 2020 at 8:27pm

I had measured the aileron angles on the side of the fuselage using a protractor ,I will check again , How effective is divorcing the elevator ?

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Permalink Reply by Jim and Amelia Isaacs on January 1, 2021 at 6:00am

Kevin, there is a Zenith drawing that shows the method and locations to measure the deflections, do you have this document? 

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Permalink Reply by Kevin Beriault on January 1, 2021 at 9:31am

Yes , they are in the original plans , currently the 701 is to spec , but I would like to improve the roll authority , appreciate all the input ..

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Permalink Reply by Joe Spencer on January 1, 2021 at 5:32pm

The off center elevator cable bellcrank tightens the cables when applying right aileron. the more flaps out the more the geometry affects the amount of right aileron available. Taking the bellcrank off the torque tube and mounting it solid on the airframe solves the problem. You cab google it there's lots of info. Some run the cables very slack so they can get more aileron with full flaps.

The aileron travel according to the plans isn't really what you need here; but the available aileron travel as flaps are further extended. Very easy to check it off the top surface of the aileron with digital level. Takes a few minutes.  If yours is further restricted with increasing flaps then there is a potential problem on a landing with full flaps, slow airspeed and a right crosswind. Not enough aileron. It doesn't take much if you're slow like 40 TAS. Same thing on a slow full power go around with full flaps, slow airspeed and 912 ULS. It will roll left unless you bring the power in slowly and get the flaps up as soon as airspeed permits. Not enough aileron to control it. I think that's why there's only one notch allowed now and I agree. Also I have heard ZAC personnel say "just fly 50" that's about 1.6 Vso. Not very STOL.

I'm speaking of my airplane only. I don't know what others have found with theirs.

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Permalink Reply by Jim and Amelia Isaacs on January 1, 2021 at 6:33pm

...and don’t forget to use the rudder as one of your tools to assist in counteracting a low speed torque roll. 

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Permalink Reply by Kevin Beriault on January 1, 2021 at 11:01pm

I am going to have to either divorce the bellcrank or modify approach procedures .. the work involved is significant so I need to decide wether it is an inconvenience or a legitimate safety issue ... thanks again kevin

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