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Old 09-12-2008 | 04:56 PM
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SCALECRAFT
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From: MONTEBELLO, CA
Default RE: CMP BF109F BUILDING THREAD

Kahlog

If you have a minute, please help me understand.

Why would the arf builder not just shim a standard air retract to achieve the degree of forward rake as desired/needed?

Also in an air retract system, the desired gear down position can be achieved with shims as well, due to the air cylinders having pressure in them at all times. No binding as with electric/mechanical. This air pressure on my planes have always been enough to keep my gear up even when the retract has no locking up position. Since the air pressure is enough to keep the gear up, the gear down position can be in the position you want. And in the down position is where the locking design is important.

So the up position goes up till it hits the top wing and stops. The 120-150 psi air pressure keeps it there. No air loss, (quality system and installation) no battery drain, nothing.

There are many readily available air retracts that will work here. Its not special design, the Spitfire retracts out there will work as well.

I can make any air gear system work in the CMP factory design, as can anyone. The retracts in my CMP 109 are for my CMP Zero

As far as tearing models apart, thats just a disorder I guess.

Steve