About this Plan
Pixie. Free flight model for CO2 power.
Quote: "This Carbon Dioxide endurance plane offers all the fun of free flight gas flying at a low cost. Pixie, by Claude McCullough.
THE appearance of the Herkimer CO2 motor on the market is an event in modeling history as significant as the first gas model flight and the introduction of U-Control. Nothing in years has so captivated the fancy of balsa fans. With the packaged, clean power source and trouble-free operation you can fly all day without sweat, or strain, or grease on your best pants.
The 'Pixie' was developed shortly after this year's meeting of the Mid-States Model Aeronautical Association at KC when some of the enthusiasm exuded by AMA prexy CO Wright, son Bob, and other CO2 sters rubbed off on me. It's been proven stable and easy to fly and its 4-1/2 ounce weight and low-drag wing section give a high climb and a flat, floating glide. You'll find it ideal for either sport or contest work.
Of great importance in obtaining peak performance is-getting efficient use from the CO2 cartridge. A great deal of possible motor run may be lost in the motor and cartridge from 'refrigerating.' For this reason the motor fins should not be cowled in - heat is absorbed from the air passing through them. Many methods have been tried to keep the cartridge warm during the run, from immersing it in water to wrapping it with chemically impregnated cloth. One of the boys used carbide around the cartridge ; the sweat from the cartridge during the run is supposed to set the carbide to burbling and producing heat. Most such methods are either sloppy or downright dangerous and all are bothersome. So if you are inventively inclined, see if you can lick the problem of keeping the cartridge from losing heat. But keep in mind that heating above body temperature is not only against AMA regulations but like striking matches on a box of TNT. Adding heat is not necessary - just keep it from losing heat and you're set for longer and higher flights.
President Wright and company have figured out a daisy of a revision on the motor in an effort to produce a longer run. The idea is to reduce the volume of the cylinder and cut down on the amount of charge taken on each stroke. It has been pretty well estab-lished that you get more efficient use of the cartridge from a fairly long run instead of a setting that gives a short high speed run. So the nub on the top of the piston was filed down and the cylinder screwed down. Normally, screwing down the cylinder makes the nub raise the ball valve higher, admitting a larger charge and giving a fast, short run..."
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Update 02/06/2019: Added article, thanks to RFJ.
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