Thomas0840
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- Feb 3, 2018
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This is a brief description of my conversion to rocket power of a Multiplex FunJet Ultra. The plan was to use the Aerotech E15-PW motor or the RMS 24 mm R/C reloadable.
I took a used 24 mm D sized motor tube and modified it to center in the 40 mm I.D. FunJet fuselage. Centering rings would have been easier, but I didnt have any.
I installed a plywood bulkhead in the fuselage so that the motor to would rest against it and the nozzle of the motor would extend about ¼ inch beyond the plastic tailpipe.
I then assembled the FunJet according to the instructions and glued the motor tube into the rear of the fuselage. I added two plywood-mounted 1010 rail buttons to the bottom of the fuselage for launching.
Since I use a one-cell, 500mah LiPo battery to power my Spectrum receiver and servos, I needed to add about 1.5 ounces of lead to the nose for proper balance with an empty motor casing. Ready-to-fly weight is 16 ounces.
My launch system is a 6-foot 1010 rail set at a 30° angle down from vertical. Since the plane takes off at tremendous speed with the E15 motor, it is necessary to add some down elevator trim for launch or it will try to make a large loop.
The launch is exciting, but you need to be quick on the controls to keep it tracking straight. The airframe handles the acceleration well and will reach a respectable altitude. It will glide for quite a while and is easy to fly.
I will try the RMS motor as soon as it becomes available. That will prove to be easier to handle at launch because it has less thrust and longer burn time.
I took a used 24 mm D sized motor tube and modified it to center in the 40 mm I.D. FunJet fuselage. Centering rings would have been easier, but I didnt have any.
I installed a plywood bulkhead in the fuselage so that the motor to would rest against it and the nozzle of the motor would extend about ¼ inch beyond the plastic tailpipe.
I then assembled the FunJet according to the instructions and glued the motor tube into the rear of the fuselage. I added two plywood-mounted 1010 rail buttons to the bottom of the fuselage for launching.
Since I use a one-cell, 500mah LiPo battery to power my Spectrum receiver and servos, I needed to add about 1.5 ounces of lead to the nose for proper balance with an empty motor casing. Ready-to-fly weight is 16 ounces.
My launch system is a 6-foot 1010 rail set at a 30° angle down from vertical. Since the plane takes off at tremendous speed with the E15 motor, it is necessary to add some down elevator trim for launch or it will try to make a large loop.
The launch is exciting, but you need to be quick on the controls to keep it tracking straight. The airframe handles the acceleration well and will reach a respectable altitude. It will glide for quite a while and is easy to fly.
I will try the RMS motor as soon as it becomes available. That will prove to be easier to handle at launch because it has less thrust and longer burn time.