[BansheeBoy]

Thanks

This is the look I wanted. Clean.

Jeff

[hifly2104]

Originally Posted by scaleguy

Cut the bottom of the air cooler out as well to give eit air hole.

Do Not shim cowl out it will look wierd and was never intended to be that way.

You do not neeed a dummy engine. IN the full scale Yak you can not see cylinder heads antways because the front is lovered cooling fins.






You can use plastic or 1/32 ply to make a plate to block the whole n the cowl.

That is exacly what I tried to describe. How did you hold it in Jim I used Silicone

[Kevin McGrath]

The whole idea is to force the cooling air through the fins of engine.Next time you are close enough to a full sized high wing take a look at how tightly the air is channeled around the engine.Same thing with many weed whackers......the classic in to out ratio is 1 to 2 but channeling the air is more important.Not done properly you can actually end up with dead air behind the engine getting hotter and hotter with very unhappy results.

A different application but the principle is the same.

On our F3D pylon racers we used what is called a pressure cowl. Control line Speed and Team Race flyers have been using them for years.

The engine has a tight fitting jacket around the upper case. The incoming air is forced through the fins and around to the rear of the case. In my application I was using a tuned pipe. The cowl had a tube along it's length with about 1/8" clearance around the pipe.

See Picture

Ed S

[BansheeBoy]

Thanks

I picked up a sheet of 3/32 ply. Has anybody had any luck steaming this. I want to curve it so I can direct the air flow over the head then out the bottom of the cowling.

Jeff

[hifly2104]

Look at Scaleguy's picture this should be all you need to do