I have two of them, both with OS 7D carbs. Older one is in a Goldberg Ultimate Bipe, 12 years old now, and I run a 14x10 APC prop on it, 10% Omega fuel. It equals a friend's Ultimate with the OS 108, but we went to a 15x8 to slow it up a little for him. My second one is in a Lanier Laser 200 (kit), same set-up but I run a 15x8 on it since it is a little bigger airframe.

I have 38 glow engines, 21 in use, and the ASPs are not the best of the bunch, but are fairly reliable work horses with the OS carb. Start easily, almost never touch the needle valve, no dead sticks, good idle. OS A-3 plugs work well. And one uses a Slimline Pitts style muffler, the other a Bisson p. style. Both good.

Hope this information is of use to you.

Clair