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----- Original Message -----
From: Mr Gary Burns
To: lancair.list@olsusa.com
Cc: Lance Neibauer ; Frank Fry
Sent: Monday, 9 October 2000 11:22
Subject: Walter 601D powered Lancair IVP


Here is an update on some of the test flying results of Frank Fry's Lancair
Turbine.Every one was keen to find out how it goes at altitude so here are
some preliminary figures. The climb to 25,000 feet took exactly six & one
half minutes initially with 85% torque & 1850 RPM. At top of climb there was
an abundance of power to go much higher.58% torque was still available at
this altitude. The fuel flow at this levl was 109 litres per hour or by my
calculation 28.794752 US Gallons per hour.This engine has 1500 hours since
last overhaul & is due for a compressor wash , so the fuel flow should come
down, especially if flown higher. The indicated airspeed of 195 knots for a
true airspeed of about 295 knots was disappointing but we attribute this low
speed to the inefficient propellor design. The prop is off the LET 410 & has
4 inches cut off it for ground clearance purposes. The Let is an old design
with a cruise speed around 180 to 200 knots so it is a big ask to expect the
prop to be efficient at these higher speeds. Frank will attempt to source
the Avia 84" higher performance blades when they become available. The ideal
prop would be a Hartzell purpose built & at Oshkosh this year they mentioned
they have a blade design in mind for the Walter. If more builders went down
the path of the turbine, I am sure Hartzell would expedite the building of
this prop. I will report more on the progress of this exciting aircraft as
test results come to hand. Regards Gary Burns

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