I know it's comparing eggs with apples (or chalk with cheese) but we maiden-ed my 1/6 scale BUSA Pup yesterday.
In accordance with the instructions (and with my engineers mark one eyeball hurting terribly) I dutifully installed the OS 52 Surpass with 2 degrees down and right thrust. In fact it's as plain as anything to see when looking down from above the fuselage just how much right thrust there is.

Jon (My test pilot) said that it tracked beautifully and needed no trim whatsoever on the Ailerons. Given how slap dash I felt that the rigging and alignment was, I was pleasantly surprised at this assessment.

I do however have to add some more weight to the nose. Although I followed the Kit instructions to the letter regarding engine setup, I thought the CoG looked very far forward on the plan and using the standard Biplane CoG calcs, put it 1/8th of an inch further back... I'll be pushing it forward again to where it should be.



Good luck with the next test flight!

Cheers,

Hugh