Hat off to you Ernest for giving it a try.
Looking at some of the impellers in the article - it would
appear that the size of the your blades, the distance between rear and
front rings and their strength simply was insufficient to stand up under
gyroscopic, centrifugal and air loads (you say you already know that?).
Seriously, I would say the structural rigidity and strength simply was not up to
the loads - most of those impellers are cast or machined from a single
piece.
Next try might look something like this? a bit less bite
(less distance between your rings) would add to the rigidity and strength - I
really like the idea that you gave it a try. Clearly there is sufficient
power there to do something with the right impeller. I certainly liked
your concept and placement of the impeller.
It took me about 5-6 intake experiments to finally get it
right - so don't quit!
Ed
The airfoil type looked somewhat similar to your
concept
Give it another go (later of course)
Ed
Sent: Wednesday, May 18, 2011 6:29 PM
Subject: [FlyRotary] Blower experiment: FAIL
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