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#1
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This is going to be my next step. Fortunately, I've found a source that has a few used / functional units. We are negotiating on price right now. They are front motors and require me to take all they have. The asking price is going to be less than $1000 each. I'm seriously thinking about it since Cessna wants either your house or both kidneys for one.
Last edited by Richard : 06-07-08 at 03:31 AM. 
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#2
06-07-08, 04:10 PM
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Richard:
I believe, as stated earlier, that the rear motor is a very different unit and that use of the front motor in the rear is a recipe for trouble. If I'm right, and if most of the failures are in the rear, is having a bunch of front motors a good idea? It would be an asset for Skymaster owners if you acquired such inventory, but I'd hate for you to be burned financially. Ernie
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#3
06-08-08, 12:51 PM
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Cowl F;ap Motors
I have just spent a couple of days just lookiing into the difference in the part numbers and why there is a a difference between the two and I have not found one yet.
A motor is a motor and to control these motors you have micro switches to limit the open and close limits. So any ideas? Pete
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#4
06-08-08, 01:03 PM
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The rear one has a brake, the front one may not. Gearing and motor torque may be different, in part due to different aerodynamic forces that the device must overcome.
Ernie
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#5
06-08-08, 08:23 PM
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The front and rear are both a MIL SPEC 8609- motor, the 24 10,000 rpm motor is still the same, but that is the end of the similarities. (unless you are talking about early 337s and 336s, they have the same motor)
The front one is a 524.6:1 planetary gear motor which gives you 215 oz/in force. The rear one is a 11??:1 planetary gear motor that gives you almost 500 oz/in of force as well as having an electric brake on the back. It is about 1.5"-2" longer than the front motor. I've stayed up lots of nights counting all the gear teeth and figuring out the DC motor side. One thing I have learned is how important that 2 amp inline fuse is to the system. There is enough force from the motors to cause some real damage before it overheats and burns out. The 2 amp fuse is there to protect both your skin and the motor windings.
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#6
06-09-08, 09:46 AM
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Cowl Flap Motors
When I purchased my aircraft both front and rear cowl flap motors failed to move. My A&P
removed both motors and we removed the motor brush end cap, cleaned the dirt and gummy build up of oil. That was 8 years ago. They have been working fine ever since. Dale Campbell
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#7
06-12-08, 11:43 AM
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I should have went out and bought a lottery ticket yesterday, it truly was my lucky day. I found a bankruptcy liquidator that had a NEW cowl flap motor in inventory. They didn't know what it was, probably didn't care, and wanted $350 for it. Well.... Ok. "I guess that would be a decent deal." Hung up the phone and did a little victory dance.
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