Bill,

That's what I like to hear. Not only that I should or shouldn't do something, but a simple and clear explanation for your reasoning that I can understand and then draw my own conclusions by. It makes sense what you've described, and I will follow it. I wish the manufacturers would provide a simple explanation on such building essentials with their instruction sheets. For example, Sig tells you with their Seniorita kit instructions that you can apply right thrust or leave it out. They explain that it simply helps to offset the thrust of the engine rotation and so then is preferable. But being that the Seniorita was a high wing trainer (not an earobatic plane), they don't proceed with explaning to you that right thrust is NOT desirable with an aerobatic plane. So I was forever under the eroneous impression since building that Sig Seniorita kit many years ago, that right thrust is always a good thing to incorporate in ANY PLANE!
I was further mislead to thinking right thrust is preferable in all planes after seeing 3 degrees was added in my Giant Top Flite P-47 too. (Yea, because I now know that the P-47 isn't designed as an aerobatic plane either!)

When I completed my scratch 89" Sig Astro Hog In January, the original 71" plans showed zero right thrust as well. I didn't like this, because I know my 4 trainers always had right thrust in them. So I added about 2 1/2 dgrees of right thrust to the engine on the advice of the "experienced" guy at the hobby shop. But now, after understanding how right thrust can affect aerobatics by you, I'm glad I didn't go all the way up to the 5 degrees right thrust he said I could go. No harm done, as I know that the scratch Astro Hog, 21 lb plane powered by a Moki 2.1 isn't going to fly like a Big Bingo anyway. (Even though I cut the wing dyhedral on the scratch Astro Hog down in half because I wanted it to be more aerobatic, I know 2 1/2 degrees of right thrust isn't going to be a big drag on its performance anyway. But I'm glad I didn't push it with going 5 degrees right thrust!).

Thanks,
Randall