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Message
10lbs. That is about the weight of a rotor. But
you'll be spinning it
3 times as fast, so it'll have 8 times the momentum
(momentum is
velocity squared, right?). The object is to keep the shaft
from
speeding up and slowing down, and I think increasing the momentum
8
times would accomplish that well.
Hi
Ernest,
All WAG's
appreciated. I'm not sure the biggest problem is the missing mass of the
2nd rotor, but rather the missing firing pulse. If we were to continue
your momentum thought though, the flywheel advantage would be even greater
than you suggested. Remember that the center of the
rotor mass is traveling in a much smaller radius circle than the mass
of the flywheel ring that I proposed. Heck, maybe that 1.5 lbs of weight
that I had before would have made up for the missing rotor
:-)
other ideas: Have the disc water/laser cut. And
you don't need 4130,
so have the cutter use whatever steel they have on
hand. Have a brake
shop turn the disc and balance it, or you might just
be able to get a
brake rotor that would bolt right into place with little or
no
modification. The heavy duty Matco rotors I just bought seem to
be
around those dimensions if memory serves.
Interesting
thoughts. I'm still leaning toward trying to install 4 separate weights,
which makes it possible to do this without pulling the drive off. It also
makes balancing a simple matter of precisely weighing the added weights. I
can buy 1/2" steel discs in various diameters from McMaster Carr, so I would
just have to drill a hole in the middle, and bolt them on. I wonder what
the limit of a 7/16" bolt is for holding a couple pound weight spinning at
8000 rpm. Probably don't want to have anything in the arc of the
flex plate the first time it was run up :-0
Dale,
I thought about
flywheels, but aren't they always manual trans flywheels, made to install on the
shaft itself? I need something that coexists with the current auto
balance weight, flex plate, and Tracy's dampener
plate.
Thanks,
Rusty (trying hopelessly to
resist)
PS- Congrats to Joe! If this keeps up,
people are going to think that rotaries can only fly backwards
:-)
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