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Old School VooDoo Combat
So one day I told Steve Muller that I had a couple of old Fox combat motors, a .35X and a .36X. I said I was thinking of making a VooDoo and Steve said he had a .36X as well as some VooDoo plans. Perfect !! I made a few copies of Steve’s plans and set out to construct an old school VooDoo with a bit of newer materials and methods.
First things first, a fuel tank. I made up a quick CAD drawing of the tank I wanted keeping in mind the constraints of the wing where it will fit. I fashioned a tank body and a couple of tank ends from .005” Brass sheet. Next I inserted the feed and vent lines. Since I planned to tap the motor for crankcase pressure I soldered up the end of the vent line and then drilled a small orifice hole through the solder. Then I buttoned up the tank with solder all around and pressure tested the unit.
The wing is a simple barn door with 11 wing ribs and 4 center ribs that are only slightly different due to the planking on the center section. I slotted the leading edge and then dry fitted the wing before gluing it up and then mounted the bell crank and fuel tank into their places. Next I made up the center motor mount from ½” Maple with a balsa filler and 4-40 blind T-Nuts. I fashioned a motor mount cheek from ½” balsa and epoxied it all together into the wing. The two booms are made from 1/8” plywood and the elevator is 1/8” balsa. The motor mount, booms and elevator are the only painted parts.
After some assembly I had a bit of instant gratitude as I feel is necessary during any build. Final assembly consisted of mounting a piece of 1/8” tubing to the front of the elevator with some Tyvek and then gluing it all together to the wing. After mounting a clevis to the pushrod and control horn, the only thing left was to mount the motor.
The motor is a sweet old Fox .35X that has the rear plate tapped with a fitting for crankcase pressure and the venturi insert drilled out slightly for more airflow to allow for the pressurized fuel feed. With a Zinger 7.5 x 7 prop it makes almost 84 mph. Not bad for a 50+ year old design.