WEMOTEC HW750 TWIN MOTOR SINGLE FAN DEVELOPMENT
FINAL ASSEMBLY AND TESTING
This pictures show the final assemble HW750 twin motor fan mounted on the test fixture ready to run up. The intake is made for testing. In the EDF airplane the split intake ducts will be faired into this intake. The exhaust tail cone is reduced to 80% of the SFA (Swept fan area).
This picture shows the front view looking into the fan. The center divider provides the support for the second motor and tapers to a point in front of the fan.
After final assembly the fan was spun up using air supplied from a compressor. It was a beauty to watch and listen to. The Hacker motors have virtually no cogging so the rotor free wheels very well.

FINAL TEST RESULTS 4/1/02

2 30 cell packs 31,100 RPM 5133.3 total watts 14.5 pnds static thrust 200MPH Efflux velocity. 80% SFA tail cone

2 26 cell packs 29200 RPM 4394 total watts 12.9265 pnds static thrust 80% SFA tailcone

TEST RUN UP VIDEO

Here is a Real Player video clip of a test run up on 2 26 cell zapped CP1700 packs, You will need Real Player V.8 to play it. HW750 twin motor single fan run up (file size 612K)

Here is an MP4 video clip of an HW730 test run on 2 8s4p Lipo packs turned with 2 Mega 22/30/3 brushless motors to compare sound and rpms. HW730 twin motor single fan runup (File size 1mb).

THE INITIAL IDEA

FAN CONSTRUCTION

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