This is the business end of our 40% Extra330, 3W-150B2SS.

You can notice the baffles that have been added for better air flow too and over the cylinders. Always remember, you must make the air go where you want it to go. Otherwise, it will take the easiest route in and out of the cowl. It will cool your mufflers great but will bypass the cylinders or give them very little cooling, at the most. Everyone has an idea how to cool. Just ask or look around at your local field. Everyone is an expert.

What I am showing you in the photo is the same way full scale aircraft engines are cooled. It is a misconception that you just put a ring around the cylinders from the air intake holes. All this will do is again, let the air take the easiest route out of the cowl. It is imperative that you cool these engines in high heat maneuvers (Torque Rolls, hovering and other 3D flight). With correct baffling, you can lower your engine temp by as much as 100 degrees!

The material you use is not important. In an emergency at a meet I have used anything from cardboard to 1/16" balsa. I do suggest using 1/16" balsa, light cloth, glassing it(laminating epoxy) and painting for good looks.

On the 3W you will need to bring the horizontal baffle 1/4 above the port at the base of the cylinder but no more than 1/2. You will glue this baffle at the front(bottom) of the air intake on the cowl. It will be brought back to within 1/16" of the fins. Making sure you cannot see through the fins but only see the barrel of the cylinder. It will extend from the crankcase where the structural webbing is all the way out to the cheek of the cowl. Next, you will take a piece of 1/16" balsa and go vertical from the very top of the cowl(enclosing the cheek to the spark plug but not over the cooling fins on the top of the cylinder). These fins are functional and help cool the cylinders This piece of balsa will be at about a 20 degree angle depending on aircraft style (cowl). It will be glued to the horizontal piece.

Keep in mind, you do not want the air to escape under the fins. You will use the top of the cowl as the top of your airbox. Doing theses simple steps will make your engine a happy camper and not so prone to over heat and quit at a most inopportune time.

	This is baffling on Garrett Morrison's 3W Extra using this method he has decreased the temperature on his cylinder heads by 60 degrees!