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SigKavalier -> Anyone done anything this stupid before??? (7/27/2003 12:24:21 AM)
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It could be done, but would be very costly. First the best and only way to go is brushless with li-poly cells.
So let's say 3 wattage fans with cut-down kyosho rotors or 3 vasa fans. Running Hacker B20's on 3 thunderpower li-poly packs.
That's $100 worth of fans, $500+ worth of motors, $150+ worth of li-poly's, and you need 3 brushless ESC's.
Most brushed motor EDF setups can't even produce a 1:1 thrust ratio without an airframe. Just fan, motor, esc, and batteries.
The new li-poly's and a brushless will get you much closer. Plus the speed 400 and smaller brushless motors can use li-poly's at a much lower cost.
If I were to try it I would use 2 large geared motors turning two ducted props. Which produces much better static thrust on less juice than a ducted fan. Like 2 Razor 300's mounted into two GWS gearboxes swinging 10x7 APC props. The duct would be a simple airshaped ring around the prop which prevents the normal losses at the prop ends. Actually in a duct would probably need to run smaller 9x4.5 or 9x6's.
Then in the nose I would use a helicopter tail rotor on a gyro to control pitch. The Razor motors are about $70 a piece, and you can use $48 thunderpower li-poly packs for 15+ minutes of power. You also save about 6oz of weight over normal packs.
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