Today's Message Index:
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1. 03:40 PM - Hartzel Blended foil (Craymondw@aol.com)
2. 06:26 PM - Re: Hartzel Blended foil (Matt Dralle)
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| Subject: | Hartzel Blended foil |
We had another chance to test our new Hartzel blended foil prop on our
Glasair 2S FT-!0360 200 HP engine. We flew the plane with a light cross wind
this time and noted a shorter take off roll from the runway end threshold to
the hash marks. This time we noted that full take off RPM had settled down
to 2600 rpm and that the fluctuating RPM we had on our first flights may
have been due to either the prop purging itself of a little air or the oil
being a bit warmer. Our last prop required adjusting the hub stop to get
2750 rpm. We climbed to 6,500 feet at a 140 mph indicated airspeed and noted
this new prop provided a much higher rate of climb than our old prop did.
Once at altitude we flew West at 6,500 feet with 24 inches manifold
pressure, 2450 RPM and 50 degrees lean of peak for fifteen miles and recorded
GPS
ground cruise speeds of 214 mph in one direction and 204 mph on the return
course that averaged out to 209 mph and noted an increase of around 15 mph
over our old cruise speed. This increase in air speed was a bit lower than
the twenty mph increase we noted at 3,000 feet. But this may have been do
to slightly warmer temperatures and saturated air from a rain system that
was moving in. The visibility for this flight was limited and no were near
the crystal clear air we had on our first two tests flights and that may
have been the cause. We also noted with our old prop that increasing the RPM
over 2350 rpm didn't add to the air speed, but increasing the rpm with the
new blended foil did increase airspeed all the way up to 2475 rpm. My
guess for this is that the new blended foil has far more bite at higher rpm's
than our old prop did. When the weather cooperates we will shoot for 8,500
feet on hopefully a clear day.
Message 2
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| Subject: | Re: Hartzel Blended foil |
Nice report. What was the "old" prop you had?
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com Matt's Building Blog
Finishing Up...
At 03:27 PM 3/4/2010 Thursday, you wrote:
>We had another chance to test our new Hartzel blended foil prop on our Glasair
2S FT-!0360 200 HP engine. We flew the plane with a light cross wind this time
and noted a shorter take off roll from the runway end threshold to the hash
marks. This time we noted that full take off RPM had settled down to 2600 rpm
and that the fluctuating RPM we had on our first flights may have been due to
either the prop purging itself of a little air or the oil being a bit warmer.
Our last prop required adjusting the hub stop to get 2750 rpm. We climbed to
6,500 feet at a 140 mph indicated airspeed and noted this new prop provided a
much higher rate of climb than our old prop did. Once at altitude we flew West
at 6,500 feet with 24 inches manifold pressure, 2450 RPM and 50 degrees lean
of peak for fifteen miles and recorded GPS ground cruise speeds of 214 mph in
one direction and 204 mph on the return course that averaged out to 209 mph and
noted an increase of around 15 mph over our old cruise speed. This increase
in air speed was a bit lower than the twenty mph increase we noted at 3,000 feet.
But this may have been do to slightly warmer temperatures and saturated air
from a rain system that was moving in. The visibility for this flight was limited
and no were near the crystal clear air we had on our first two tests flights
and that may have been the cause. We also noted with our old prop that
increasing the RPM over 2350 rpm didn't add to the air speed, but increasing
the rpm with the new blended foil did increase airspeed all the way up to 2475
rpm. My guess for this is that the new blended foil has far more bite at higher
rpm's than our old prop did. When the weather cooperates we will shoot for
8,500 feet on hopefully a clear day.
>
Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551
925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email
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