About this Plan
PM-Bee. Sport model for CO2 power and either free flight or radio control.
Quote: "Whether you consider yourself a typical, experienced model builder, or are an Ace at local model plane meets, you might like to add this little engine-driven plane to your squadron.
You can fly it almost anywhere - it's powerplant is scarcely louder than a bee. Fueling is a simple, odorless operation. There is no smoke problem. It is sophisticated, but fairly simple to build.
Carbon dioxide gas (CO2) is the fuel. Under pressure, as it is in the cannisters you buy - the gas is a liquid, which means enough can be carried in a small tank for long flights. The liquid vaporizes as it expands to drive the engine. The powerplant is similar to a steam propulsion unit in that the the tiny CO2 tank in the plane acts as a boiler, and the surrounding air as the fire.
Under high pressure in the tank, the liquid CO2 travels through an exposed coil in which it is warmed to outside temperature. When it reaches the engine, it is a high pressure gas. A tiny ball valve in the cylinder head, opened when the piston reaches the top of its stroke, meters the gas into the cylinder as needed.
This little plane, which we've named the PM-Bee, can be built as a free-flight model or as a radio-controlled Flier. Very lightweight commercial equipment is now available to make R/C flying of such tiny planes quite practical.
While of simple construction, the Bee is not a first project for beginners: its delicate balance acquires some skill to achieve. But for the powerplant, cost of materials is low.
Keeping weight down is a must to obtain best flying qualities. Pick all wood carefully. Use a minimum of cement (just enough for firm joints) and as little dope on the com-pleted plane as necessary.
The fuselage sides and doublers (the latter run forward from station E to the nose) are of soft 1/32 sheet; the heavier outline on the fuselage side view shows exact shape to cut the sides. The doublers are the same, but taper off between stations D and E..."
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by Howard McEntee
from Popular Mechanics
CO2 R/C Cabin
all formers complete :)
got article :)
Found online 13/04/2013 at:
Format: • PDFbitmap
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