Heres a link to my Franken Blower video, check out my garage for most of the build.
36" bucket off of a garden tractor, custom mated to a Troy Bilt tractor, 16 hp honda clone engine, and double belted for power transmission. Single belt couldn't handle the 1800 rpm load of the impeller.
We had about 12" of powder snow that i was moving in the video.
At 1800 rpm and double belts on a couple of my custom machines... ive found it to be the happy medium and have had no issues. My auger shafts have been machined to a 3" key engagement rather than the factory 7/8 woodruff key, gearboxes have been disassembled / inspected / 00 grease replaced the gear oil.
My 32" machine has been flawless for years now. I've experimented with higher & lower rpm's, and settled on 1800 or so. Everybody has thier opinions and thats ok, this just happens to be mine.
Im going to be keeping the single belt for now and see how it handles the snow. If it wears the 1/2" belt prematurely I'll update to double belts next year.
To achieve the approximate 1800 rpm's at the impeller I have a 3" engine pulley and a 6" impeller pulley, engine running 3600 rpm.