From: "Ben Haas" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] 20B with RD-1C Prop Options
Thread-Topic: [FlyRotary] 20B with RD-1C Prop Options
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Date: Thu, 29 Oct 2015 21:37:11 +0000
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I have had good luck with my Ivo Prop......

I bought both the Magnum series blades and the Magnum Paddle blades.. Start=
ed out at 84" diameter, They were too dangerous as that large a diameter ha=
s a  leverage effect that tried to roll me inverted at slow airspeed and fu=
ll power ( 400 HP.... I am a piston guy though)... had Ivo cut them down to=
 76".. I also got the kit to switch back from two to three blades....  Plan=
e was slightly faster with the 2 blade .. But ALOT smoother with the three =
blade set up... I also have the inflight adjustability... Works good.  Prop=
 has over 500 hours...  Good deal for the money....=20

I originally priced a MT, but they quoted 14 grand.........  No thanks..

________________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of =
James R. Osborn <flyrotary@lancaironline.net>
Sent: Thursday, October 29, 2015 2:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] 20B with RD-1C Prop Options

Hi guys,

So I am going to be building an RV-10.  I sourced Bobby=92s spare 20B / RD-=
1C combo and my plan is to work on the motor first, kind of bass-ackward bu=
t that is what I am doing.  My plan is to build a motor/mount test stand an=
d work everything out on the ground before I ever put it in an airframe.  I=
 plan to set it up NA using the existing side port configuration.  I don=92=
t know if it is ported - I am going to attempt to determine this by inspect=
ion without cracking it open and doing a dynamic compression test to evalua=
te the health of the motor.  If it is necessary to entirely rebuild the mot=
or, I would probably go PP.  So I am thinking the target HP as it is would =
be in the 275 HP range and probably 325 HP if it ends up being a PP.  How d=
o these numbers sound to you all?

I will be looking for a way to dyno it, hopefully borrow one to get some da=
ta.  But I was also thinking about just getting an appropriate fixed pitch =
prop and working through the bugs based on static run ups.  I like the idea=
 of a three blade prop.  I like the idea of optimizing for cruise at 75%, s=
ay 5800 rpm which would put full throttle at 7733 rpm on the 20B.  At 5800 =
rpm, the prop would be spinning 2035 rpm and at full throttle 2713 rpm (usi=
ng the 2.85 ratio RD-1C PSRU).  Do all these numbers sound about right?

If so, then how do I choose a prop that will result in 2713 rpm static run =
up at full throttle, but be tuned for efficiency at 2035 rpm cruise?  I am =
assuming at these reasonable RPMs that it will be a larger swing and the th=
ree blade makes sense - what do you think?  Is there a convenient way to fi=
nd props out there that will work at the target full throttle HP of 275 or =
325?  Also if you guys have any good resources to learn about how to figure=
 these things out (books, web pages, online calculators, etc.) that would b=
e great!

Another option might be to go with something like the IVOPROP Magnum, eithe=
r ground adjustable or electric inflight adjustable.  What do you guys thin=
k of these?  Would the adjustability really help me adapt to however my pow=
er plant turns out?  Would the extra complexity be worth it?  For the groun=
d adjustable one, I am thinking the process would be:  1. select the =93cor=
rect=94 swing (how?) and go for three blades, 2) use ground adjustability a=
nd work up to THE pitch while I tune the motor until I achieve full throttl=
e static run up around 7700 RPM.  Will this result in a reasonably efficien=
t setting for 75% cruise?  Am I thinking about this clearly?  All opinions =
are welcome.

There=92s a lot for you to chew on!

=97 James


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