I've got a webra 1.2 on a 72" sport plane I designed. See picture attached. I've run this plane for two years now, this is the second Webra to grace its front end. I wore the first one out after about 150 flights. Its a Dykes ring engine so the first thing to go is the compression.
I am using an OS Carb and backplate pump on mine, it runs and carburets flawlessly. I have never had any hassles from it, going on now 100+ flights from the second engine. I can restore the first engine with a ring change and have a spare.
This plane was built around this engine with full length tuned pipe (The Webra responds VERY well to the pipe). It weighs 9.5 Lbs.
Turns a 16/10 mejlik at 9200. The best vertical performance of any plane I have , including 100CC IMAC gassers.