Ran my Q52 for the second time today. First time was back in fall just after I bought it using a test stand. There wasn't enough light left in the day for accurate tach readings. Very good light today, with the temps in the mid 40s F. Engine was mounted in my TLAR Giant Stinger.

This is my first gasser that I've run. Must say it wass pretty easy to start with the spring starter system. I haven't touched any carb settings and it seems to idle and run up pretty decently. Using an APC 20x10 it managed 7.4k. I switched to an APC 21x10 3-blade prop assembly of my brothers and it turned that at 6.3k. My brother figured it could probably be leaned out a bit more, but said I should wait 'til I get a few more runs on it so its better broken in.

I'm not sure whether these numbers are good, average or what, but it sure seemed to have a heck of a lot of pull, especially with that 3 blade assembly. My brother figured the 20x10 might on the small side for it. What RPMs should I be looking for?

My Q50 with a Byron Purr-Power muffler/mount turns 7100-7200 with a 20x10 Master Airscrew. The engine has roughly 2 gallons thru it.

If its going on a warbird, use a 18x8-14 Zinger. You should see about 7700rpm. Dont prop this engine like a 3W at 6500, it will be a dog. These engines make a lot more power in the higher rpm range at no cost to engine life.