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Yes, I am getting 6000 static with the 74x88. Before
I had it cut down 2" in dia and it was 76x88, I was getting 5800 rpm
static. So in my case for each 1" shorter it appeared to pick up 100 rpm
static. Yes, I think a similar Catto prop would give same approximate
results. At the time the 76" dia was the largest dia you could get because
that was the length of the longest wooden blank Performance Prop used in making
a prop.
Ed
Sent: Sunday, August 01, 2010 9:06 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
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of bktrub@aol.com
Sent: Sunday, August 01, 2010 12:26
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Prop
Selection
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.
-----Original
Message-----
From: Bill Bradburry <bbradburry@bellsouth.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Sat, Jul 31, 2010 7:49
pm
Subject: [FlyRotary] Re: Prop Selection
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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