Wing incidence??
 

I am building a Juno/direct connection Tsunami kit. Think of the plane as Dirty Birdy 40 wood for size and weight.
I was setting it up last night got the wing on and zeroed. got the stab where it was level with wings centered and all. clamped down and was at 1/2 degree negative ( 1/2 degree positive in wing if stab is zero). i was thinking that should be good. so mixed up some epoxy glued and reclamped. checked alignment and still at 1/2 degree negative. well I let it cure 30 min epoxy. everything looked good but when i remeasured the set up. wing was zero and the stab is now at 1/10 of a degree negative almost at zero.

Question is i know this isnt a 3D plane where zero works well. I dont know much about these types of planes. i plan to fly ballistic style aerobatics with it with some 3D thrown in (hover, harrier and so on if plane can do it). will i be ok with this zero zero set up or should i shim the wing.
If i do have to shim the wing what is a good start? Also i do alot of flying inverted. LOL in our club T-34 racing i sometimes will fly upside down during the race on the deck at 15 feet or so.

RE: Wing incidence??
 

As best as I was able to measure incidences from the plan, the wing is set at 0.2 degrees positive while the stab is aligned along the flat top datum and hence at 0 degrees.

Being a sport model, the Tsunami appears to be set at pretty close to 0-0-0 or the wing might be set at a slight positive incidence. I think it really amounts to trimming the model out in flight. Since it is a conventional gear model, the model lifts off readily before the wing actually reaches 0 degrees incidence during takeoff.

However, relative to the thrust line, your model is either 0.5 degrees positive wing and 0 degrees stab OR 0.5 degrees negative stab and 0 degrees wing. It sounds like if your datum is at 0 (the fuse top which is also the thrust line incidence), you might have negative incidence in your stab which will result in an "up elevator" effect.

I'd try it as is and adjust as necessary after flying it. You might also need to adjust your engine thrust offset.

I do doubt you'll get much traction out of a model like this (any classic for that matter) as a 3D model but then I'm no 3D pilot.

David.

P.S. BTW, I'd be interested in seeing your airfoiled tail setup.

RE: Wing incidence??
 

Yes not looking to make a 3d model but try those out if the plane is capable. Heck I have hovered cubs before lol. Thanks all that messing and I didn't go and measure the plans. I looked at them though. Thanks I will just fly how is. Thanks.....

RE: Wing incidence??
 

You have no issues. Trim will fix it if need be.

The wing doesn't bolt on?

RE: Wing incidence??
 

yes the wing bolts on. I have room for = or - 2.5 degrees in the wing.

RE: Wing incidence??
 

Ok, but you won't need it.

Got photos?