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One definition of the difference between "shrouded propellor" and
"ducted fan", is the ducted fan has a duct longer than the fan
diameter. My shroud was only 24" long while the fan was 38" in
diameter. For your gyro application, I would think it would still be a
shrouded propellor, as I doubt you have room for a long duct.
Hi
Perry,
Good
to hear from you. I'm sure I'll have lots of questions if I get to the
point of trying this, but for now I'm mostly curious about the weight
comparison between fan and prop. When you changed from fan to
PSRU/prop, did the plane end up heavier?
The
stock single rotor configuration is already plagued by excess weight,
so one of my hopes was that this would reduce it some. At least the
fan unit would be a bit smaller than what you were using, so a bit
lighter too. You are also correct that I wouldn't have room for for a
long enough duct to be a "ducted fan".
Thanks,
Rusty
(must forget this long enough to finish the RV-8)
The PSRU/prop installation came out lighter than
the ducted fan, but it wouldn't have to be so. I was lugging around the
stock heavy manual transmission flywheel and my duct was overbuilt and
too heavy.
Perry
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