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I doubt any amount of balancing would have kept the blower together. The highest RPM I hit was aroun 4000. Most of the rivets were sheared cleanly. My design was simply not anywhere close to robust enough.
I've got a line on a company that will do one-off dynamic balancing in North Carolina. Do you think I could convince you to mill me a rotor, and then I could get my whole assembly balanced?
H & J Johnson wrote:
Ernest, did you get a high speed dynamic balance on your blower? I've built blowers of a similar form and had good results, but only after balancing to rated RPM.
Jarrett Johnson
www.innovention-tech.com
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Some of you may recall my blower experiment. Using the shaft between the flywheel and PSRU to drive a centrifugal fan to charge the intake.
My implementation died in the crib. before.jpg shows what it looked like a week ago. after.jpg is what was left of it after the few minutes I was able to get the engine to run. Well, that wasn't all that was left over. intake.jpg shows how the blades got thrown toward the intake and smashed up against the air filter.
Oh, well. Until I can design and build or have built an impeller that can handle 8000RPM, I'm going to table this experiment. I still think it is a good idea. So did these guys:
http://www.flightglobal.com/pdfarchive/view/1942/1942%20-%200142.html
Furthermore, the calculator at http://www.forestryforum.com/members/donp/Blowercalc.htm indicates that with the 10.4" diameter, 3.35" deep area available for me to put a blower, I should be able to generate 17" water column pressure.
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