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wrjjrs@aol.com wrote:
Ernest,
All that the leaf blower is is the compressor scroll of a turbo charger. many of the aircraft superchargers, circa WW2 used a centrifugal supercharger which is exactly what you are describing. Think you will find it more trouble than it's worth. Mainly due to breakage of the parts at high RPMs. You will have to design your own drive, and it is a drive even if simply a shaft connection. You would probably find a belt driven centrifugal supercharger and using a underdriven (reducing) system. You will find a supercharged 13B will make 200 HP very easily.
Bill Jepson Ed, how many Hp would be required to accelerate 307CFM of air from 0 to 150MPH? That would be the extent of the power that the fan blades would have to absorb, wouldn't it? Would there be a major drag component?
The drive is already designed and built, but what parts do you think might break, Bill? It's a compressor wheel bolted up to the flywheel. Should I expect to see problems with it shedding blades? I've looked into the leaf blower components, specifically because they were designed to run at the RPM we're looking at. Literally, trying not to reinvent the wheel. I'm assuming that they can take the RPM, since it is an industrial component that workers carry on their backs.
The shroud is the bellhousing. Not optimum, but sturdy and simple. I will probably have to add some extra aluminum sheet to keep the housing tight, but I don't see having much problems with that part.
Like Ed said, it's just an experiment at this point. I'm really just guessing that it will be worthwhile, but it's just such a simple mod that I've got to try. The labor, weight and dollar investments are all about right. I just have to see how much payback there is while avoiding throwing pieces of metal around.
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