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Mike, general centrifugal impeller such as used in turbocharger and some superchargers are rev up to much higher rpm than the engine operates at. Ernest concept involved using the engine rpm (direct drive so to speak) which is much lower than the rpm these centrifugal impellers require (for any useful pressure increase). So slower rpm generally means larger impellers than commonly found in turbo or superchargers. If not constrained to the engine rpm then yes, your suggestion would have merit - on the other hand, there may be impeller off superchargers of those big multirow radial engines of WWII that would be large enough - probably hard to find and heavy. Ed -------------------------------------------------- From: "Michael McMahon" <afm528@gmail.com> Sent: Friday, May 20, 2011 6:27 PM To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Subject: [FlyRotary] Re: Blower experiment: FAIL I'm sorry if this is a dumb question, but would this be considered a supercharger, since it's being driven by the engine all of the time? Are there supercharger or turbocharger impellers that would be large enough? And finally, would a laser-glue thingamabob (I CANNOT think of the name for the laserjet like parts 'printers') be able to make a part to withstand the stress? If not on its own, could it be used to make a mold or to be coated with something stronger? Mike -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ernest Christley Sent: Friday, May 20, 2011 2:25 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Blower experiment: FAIL 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 ---------------------------------------------------------------------- -- 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. ---------------------------------------------------------------------- -- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ---------------------------------------------------------------------- -- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html