Cowl Flap Motors
 

I am working on an STC to offer a replacement motor for the current cowl flap motors used on the Skymaster. Expected sell price for a new motor including gear head is between $800.00 and $1200.00 depending on initial quanities I have manufactured. I am surveying all to determine the interest and how many should be made on the first production run. I would appreciate your feed back.

Cheers
Jerry De Santis
Jetech Inc
N34EC:cool:

Is this going to be a sealed unit? One of the biggest failure modes is contamination, usually from washing down the engine compartment. Oh, cart before the horse, is it electric, or hydraulic? I always thought hydraulic would be a better system.


As you know, Owen sells replacement units. More expensive, however.

Jerry,

Are they interchangeable front to rear? I might consider buying a spare to help you with your effort, but since my motors are working now, I don't know if buying two would make sense.

David

motor
 

Larry, it is a sealed electric 24v motor.

Dave, we are still trying to adpat a brake for use on the rear cowl flaps but as it is at the current time, the first batch will be for the front engine. I will keep you informed.

Cheers
Jerry

Great.
Same limit switches, just a replacement motor? It would be cool to redesign the system, get rid of limit switch bounce. Just a thought.

MTR
 

Larry, I considered doing away with the limit switches and going to an encoder on the motor but that has some unique problems to solve. To do it right you need at least one limit switch as a home position so that from time to time the encoder can be zeroed out.

Jerry

As with so many things, it would be great to know that there are alternatives available when the time comes. At the moment, however, both motors are working fine. But the front one quit in May while I was in Mexico. Dead. I had a Mexican mechanic friend of mine look at it and he replaced a diode in it and it works great now. But for how long? Who knows? When it craps out, I'll be calling you!

Jerry,

What’s the progress on the new motors?

I am interested in buying one when available.


Steve

Jerry,
I would be interested.

Jerry:

Don't need one right now, but I'm sure it's just a matter of time.

Jerry:

Interested.

Keven
________
Gay Video

my rear cowl flap became frozen, we disassembled the motor and removed the
friction clutch disks. they work perfect without the clutch brake. the have never closed in flight , maybe in a extended dive at red line they might

My experience was that the cowl flaps want to open somewhat, not close. At high speed, the motor was straining to get them fully closed. If the brake slipped, they'd creep partially open.

Jerry -

Did you ever complete this motor build?

STC
 

Hello Pat, I let the ball drop for a bit of time and now back working on it. I will keep all informed as I get to the nex step.

Yap! Your right, no brush should be where the gear is. In fact, I don't know how one of the brushes got to the gear part of the unit. If it is one of the brushes from your motor, don'yt understand how the motor worked at all.

Jerry

Actually - it was not a brush - but a bushing (like a really thin washer) to keep the gear from wearing against the gearcase.

I am working now to figure out the gear reduction the existing unit has.

What do you think?

cowlflap
 

Pat, try 100 to 1 ratio. The orginal company that made the motor is no longer in business so it has to be a different orginization. What is the name of the company? If you don't want to mention it on the web, please send me an e-mail.

Thanks
Jerry

cowl flap motor
 

Jerry:
I would buy one immediately to have in stock when one of mine goes bad.

Berrien Sutton

Jerry -

From my calculations - it looks like the output shaft needs to turn 1/4 turn to actuate the cowl flap. For a 4 second Open/Close cycle - the motor would be ~ 6000 RPM motor w/ 1600:1 reduction. Very low torque. I am waiting for a price to see what they come back with...