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I'll let you know what static RPM I get when I open the throttle all the way.
Brian Trubee
-----Original Message-----
From: Bill Bradburry <bbradburry@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sun, Aug 1, 2010 6:06 am
Subject: [FlyRotary] Re: Prop Selection
Brian,
They can correct me, but I think that both Ed and Tracy are getting about 5800-6000 rpm static with a 74 X 88 prop made by Performance Props. The Catto should probably be similar.
Bill B
I've run the engine up to ~4500 RPM. I don't have a turbo. I think I could get a few more hundred RPM out of it, but I have not run the throttle to the stop, I think. I hope to have it up in the air by the end of August.
Have you run the engine yet, Brian? If so, what is your max static rpm? I don’t remember if you have a turbo??
I have a 74 x 88 Catto two blade on my RV-4, with a 13BREW & 2.85 redrive. I haven't flow it yet, but I think it will be a good prop. Catto makes good props.
I am now Prop shopping for my RV-9 13B with the 2.85 RD1-C and am leaning towards a Craig Catto prop. Craig has recommended a 3 bladed prop 70" X 88". He says that a 2 bladed 76"X 88" prop would have to be 7 inches wide at the root and 3.5 inches wide at the tip, the three bladed prop would have a thiner look to it. Three bladed prop looks good sitting on the ramp, but nobody sees the prop when it is spinning. Ground clearance might be a problem with the 76" prop. Not sure, I have not taken a measurement on this as yet.
What other venders would the group recommend? I would like to hear some opinions.
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