Maxam,
I ahve tried copying image from RCSB and pasting it into this space, it didn't work. I will try E mailing it directly to you. You really ought to belong to RCSB there is a lot on there that should be of interest to you.

I now have plans for both th 77 and 87 inch Ziroli Stearmans. Looking at your pics of the fullsize and and comparing to plans it is apparant that both th 7-77 and the9-99 extend beyond the fornt edge of the cowl. However the 9-99 extending 1/2 inch more all around is closer to scale than the 7-77. Also looking at the Ziroli plan with dummy engine, which I assume he drew to scale, it extends out further than the 9-99 by 1/2 an inch. The dummy engine is 1/4 scale and the airplane is 22.5% scale. My conclusion is the 9-99 is a near perfect fit. The7-77 looks good, but a little small. Ground clearance with the 9-99 should be no problem with any suitable prop on the 87..

I never thought I would ever be contemplating buying an engine this expensive for a model. I hope that the peoblems encountered by Olaf prove to be isolated.