I should have posted that yesterday.

A few of us had an EAA offsite last night and one of the guys owns Great Plains Aviation which deals exclusively in VW conversions.

 

I’ll touch base with him next chance I get and see if they can be had.

 

 

 Actually, Thomas back about 12 years ago I purchased some of those VW  ‘bellows” type expansion servos that worked based on the temperature they sense.  I had planned to use them similar to what you suggested – but, got my cooling problem under control by moving a RX-7 oil cooler under the nose and never proceeded with the cowl flap idea.  After 12 years and a move, I don’t even have a hint where I might have stored them.

 

Not certain they are even available any more.

 

Ed

 

 

I have wondered if there would be any advantage to using a set of those expanding bellows things they have on a VW.

They use them to control the amount of air passing over the fins on the cylinders.

 

I read somewhere that a builder had incorporated them in his cowl to vent the area after landing. Once things cool off they contract and close the vent.

I’m not sure whether or not it would fit this type of application.

 

T Mann

 

 

 

 

Great concept Ed.  Perhaps a spring load biased to open position to ensure that the flap opens sooner as speed is reduced.

Bryan

Passive, and no electricity required!

 

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