Today's Message Index:
----------------------
1. 01:04 AM - Interesting prop story (f1rocket@telus.net)
2. 07:33 AM - Re: Interesting prop story (Bob Japundza)
3. 09:28 AM - Re: Interesting prop story (Phil Smith)
4. 04:39 PM - Re: Interesting prop story (LesDrag@aol.com)
Message 1
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| Subject: | Interesting prop story |
--> Rocket-List message posted by: f1rocket@telus.net
Hi all.
While investigating which propeller to put on the rocket I sent AeroComposites
a letter asking which prop would be best for the rocket. In the e-mail
discussion I received this interesting story from them, and maybe someone out
there can actually verify it?
Quoting Harry Griswold from AeroComposites: "The performance of our propleller
on the RV8 (IO-360 engine, 220 hp, Sam James Cowl) is outstanding and in one
recorded instance pulled away from and F1 Rocket (friend flying side by side)
with the IO-540 engine."
I then asked for some more details about which prop etc. and received the
following: "I will reconfirm the details of the RV8 "fly-off" with the F1
Rocket run. The RV8 had one of our 2-bladed propellers. I am not sure what
the F1 Rocket had for a propeller. The tes results are an indicaiton of our
propellers performance although the test is not a quantative and controlled
test. In the absence of good comparative test results (2-bladed vs 3-bladed)
for our propellers, we would recommend the 3-bladed for excellent overall
performance (climb, cruise). However, the 2-bladed propeller might have a bit
faster top end cruise speed.
We will be publishing some RV8 test results on our web site very soon, to be
followed with a more detailed discussion of propeller testing/performance by
late January." I see now on the web site they are saying February.
It's an interesting story, and maybe someone out there has more details?
Thanks,
Jeff
F1 #119- right wing done (except flap mounting), empenage done, ready to finish
left wing, fuse needs engine mount/gear next.
Message 2
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| Subject: | Re: Interesting prop story |
--> Rocket-List message posted by: Bob Japundza <bjapundza@yahoo.com>
hehehe...they didn't mention the Rocket was flying at 50% power :)
The guy who owns this RV-8 has been claiming he could outrun a Rocket and likes
to boast about "no rocket guy wants to race me". Funny that at the Sun N Fun
race last year he got whipped by a stock HR2 and an F1 running at 2500rpm and
missing some fairings... It seems that guys running their mouths help sell pricey
props.
Regards, Bob
RV-6 flying, F1 under const.
f1rocket@telus.net wrote:
Quoting Harry Griswold from AeroComposites: "The performance of our propleller
on the RV8 (IO-360 engine, 220 hp, Sam James Cowl) is outstanding and in one
recorded instance pulled away from and F1 Rocket (friend flying side by side)
with the IO-540 engine."
I then asked for some more details about which prop etc. and received the
following: "I will reconfirm the details of the RV8 "fly-off" with the F1
Rocket run. The RV8 had one of our 2-bladed propellers. I am not sure what
the F1 Rocket had for a propeller. The tes results are an indicaiton of our
propellers performance although the test is not a quantative and controlled
test. In the absence of good comparative test results (2-bladed vs 3-bladed)
for our propellers, we would recommend the 3-bladed for excellent overall
performance (climb, cruise). However, the 2-bladed propeller might have a bit
faster top end cruise speed.
---------------------------------
Message 3
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| Subject: | Interesting prop story |
--> Rocket-List message posted by: "Phil Smith" <phil@analysis-inc.com>
In the last issue of RVator, the Hartzell blended airfoil was fastest,
followed by the normal Hartzell prop that Van's sells. The aero
composite was somewhat slower. The article tested about 8 different
props on what was claimed as two very similar RV-8's. If anyone is
interested, I can dig up the article and try to summarize it.
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of
f1rocket@telus.net
Subject: Rocket-List: Interesting prop story
--> Rocket-List message posted by: f1rocket@telus.net
Hi all.
While investigating which propeller to put on the rocket I sent
AeroComposites
a letter asking which prop would be best for the rocket. In the e-mail
discussion I received this interesting story from them, and maybe
someone out
there can actually verify it?
Quoting Harry Griswold from AeroComposites: "The performance of our
propleller
on the RV8 (IO-360 engine, 220 hp, Sam James Cowl) is outstanding and in
one
recorded instance pulled away from and F1 Rocket (friend flying side by
side)
with the IO-540 engine."
I then asked for some more details about which prop etc. and received
the
following: "I will reconfirm the details of the RV8 "fly-off" with the
F1
Rocket run. The RV8 had one of our 2-bladed propellers. I am not sure
what
the F1 Rocket had for a propeller. The tes results are an indicaiton of
our
propellers performance although the test is not a quantative and
controlled
test. In the absence of good comparative test results (2-bladed vs
3-bladed)
for our propellers, we would recommend the 3-bladed for excellent
overall
performance (climb, cruise). However, the 2-bladed propeller might have
a bit
faster top end cruise speed.
We will be publishing some RV8 test results on our web site very soon,
to be
followed with a more detailed discussion of propeller
testing/performance by
late January." I see now on the web site they are saying February.
It's an interesting story, and maybe someone out there has more details?
Thanks,
Jeff
F1 #119- right wing done (except flap mounting), empenage done, ready to
finish
left wing, fuse needs engine mount/gear next.
==
==
==
==
Message 4
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| Subject: | Re: Interesting prop story |
--> Rocket-List message posted by: LesDrag@aol.com
Why 2500 RPM?
That was the question I had after reading Van's propeller comparison on a
Lycoming 360 engine.
The Lycoming power chart list manifold pressure and RPM for 55%, 65% and 75%
power. The RPM's given are from 2100 to 2400 RPM. There were not any power
settings provided for 2500 RPM.
Of course, on the Lycoming 360 engine with a non counterweighted crankshaft,
MOST CS propellers have a RPM restriction between 2000 to 2300 RPM.
So that would leave 2300 and 2400 RPM as reasonable choices.
Jim Ayers
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