From: "Steven W. Boese" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: 20B with RD-1C Prop Options
Thread-Topic: [FlyRotary] Re: 20B with RD-1C Prop Options
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Date: Fri, 30 Oct 2015 21:08:55 +0000
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James,

I have an engine test stand that was used to develop a NA 3B installation a=
nd is presently used in development of a turbo Renesis installation.  If a =
prop suitable for flight is used on the test stand, operation at high power=
 causes the prop to cavitate.  When this happens, the sound is deafening an=
d the vibration is also felt through the ground.  It is worth considering t=
hat extended operation of the cavitated prop may be detrimental to the long=
evity of the prop and possibly the operator.  I don't know exactly what "ex=
tended" means and it is something I hope not to find out.=20

FWIW

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2 =20

________________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of =
James R. Osborn <flyrotary@lancaironline.net>
Sent: Friday, October 30, 2015 9:12 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 20B with RD-1C Prop Options

Hi Bill,

Yeah after I sent that I realized slip was a much smaller difference.  The =
difference between top speed and standing still is 100% slip!

I don=92t really know what to expect for HP.  I threw those numbers out the=
re for feedback.  So what numbers say for unported site port, medium street=
 port side port, and peripheral port on a 20B can we reasonably achieve?

Thanks for more input and numbers.  It will be interesting to try to work i=
t out on the ground and the more I think about it, adjustability will be a =
real big help.  I did recall correctly that a friend has an old dyno I can =
borrow.  So I guess I will move in that direction first and set the prop se=
lection aside for now.