OK Jerry here is the BD4 version. I like the rear
beam better. Also I added shims so the downthrust
angle can be adjusted.
-- 
Paul Lamar ...No rotor no motor.

Question,  in general is the thrust of an aircraft engine either
level or down?   Is it ever up?    What about pushers?    Jerry

Tractors are usually down. Pushers are up. Usually less than 3
degrees. Spacer or shims would be +/- .75 inch in case you were
asking? :) In general the thrust line passes through the CG.
Does not work for Coots and their cohorts in crime :)
No matter what you do they are going to pitch down when
power is applied and pitch up when it is reduced.

Paul Lamar ...No rotor no motor.

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