David Mischke's BD-5
05 March 2009 - UPDATE
My new BD-5 will use a Yamaha snowmobile engine. It is a 1050cc, 3 cylinder,
water cooled, fuel injected 4 stroke engine. It is rated 130 hp at 10000
rpm. I have a 2 to 1 cog belt reduction to the final drive and will be able
to use the engine up to 9000 rpm / prop speed of 4500 rpm without exceeding
prop tip speed.
The engine installation is complete and I have done a limited taxi test
without wings. Under static conditions, the engine can spin the 64" pitch
prop to about 3400 rpm. The entire engine package, including motor mounts,
radiator and fluids is about 170 pounds.
I have just completed building the wings, with help from wife, Kathy, and
friends Theron and Archie. The wings are "wet" with 13 gal of fuel per side,
so every seam and rivet must be sealed. Next is the work on wing tips,
control system, fairings, instruments, canopy, and numerous little things.
26 September 2009 - UPDATE
The numbers are: clean stall 80 mph; Vso, full flaps,
gear down 70mph. Vx 110 , Vy 125 mph- 1700 fps rate of climb. Max level
190mph at 7800 engine rpm.
I have about 7 hrs over 10 flights. Still working on cooling. Can't yet
run flat out without overheating.
March 2010 - UPDATE
I completed the Phase 1 testing of 525BD the end of December and brought the
BD-5 home for an aerodynamic beauty treatment and fresh paint. After 2
months of steady work, the plane was back and faster by 7 mph on the top end.
Max speed is 215 at an engine rpm of 8100. Power is a Yamaha Nytro
snowmobile engine; 3 cylinder, 4 stroke, 1050 cc, liquid cooled, 130 HP at
10,000 rpm. I changed to an alumuinum racing radiator which solved the
cooling problems. Clean stall speed is still 80mph. Flaps and gear down
lower the stall a bit, but the BD-5 must be flown onto the runway at about
90 mph to get a smooth landing. I received a huge amount of help from wife,
Kathy, and members and friends of Chapter 818 in the building and modifying
of this plane. My thanks to you all.
David
Davids Photo Gallery:- (clk photos for larger view)
