Why in heck do you need an RPM range like that? I hope you are not working with the information provided by manufacturers about the power output of the engine based on RPM because RPM's of that range are usually not attainable in most "MOST" stock commercial engines. The power range is usually in the neighborhood of 10,000 to about 13,000 RPM, depending on the engine.

I typically prop my engines to get a max RPM of about 12,000 out of my smaller (.46 - .55) engines the larger the lower that number will be. I typically get around 10,000 out of my OS .75 AX, and about 9,000 out of my 1.20 AX's, which is really working in the torque range of those engines. I get "unlimited vertical" out of my 1.20's on my pattern planes, and with my Goldberg Skylark 70 also, with the .55 AX.

Just remember what I always say about prop'ing engine is that noise does not equate to power. And an engine turning at that RPM will definitely make noise, but will not really gain you anything that properly prop'ing an engine will give you. And, of course, your engines will last longer at the lower RPM.

CGr.