Model Airplane News: Keep it cool: 10 steps to control air flow

GPS · Sep 20, 2013

When working with an internal combustion engine, we always have to deal with the heat that is created by this process. In many cases, the opening in the cowl will allow enough air to flow over the engine to maintain a cool temperature. But when performing extended 3D maneuvers, we have only the air produced by our prop to keep the engine cool, and sometimes this may not be enough. That is when we want to direct the air to flow over the main engine component that is creating the most heat-the engine head. Extra airflow over the engine can be accomplished by manufacturing ducting inside the cowl to direct the air where you want it to go. Here are three very important facts about air:

Air will always flow in the path of least resistance.

Air pressure will form a wall that will prevent any airflow from coming into the cowl if it is allowed to build up. That is why the exit hole is always recommended to be three times larger than the entry hole.

By funneling air, it will increase in speed and intensity.

If we make a ducting system at the opening of our cowl, it leads only to the engine head(s). It will become the path of least resistance that will force the cooling air to travel over cylinder head(s). I used materials common to most model airplane enthusiasts. The cowl ducting can be made from a variety of materials including fiberglass, tin, plywood and balsa wood. Let’s take a look at what we need for the project.
Click to expand...

Read more and see photos via the source link.

Source:
http://www.modelairplanenews.com/blog/2013/09/18/keep-it-cool-10-steps-to-control-air-flow/

Log in or Sign up

Model Airplane News: Keep it cool: 10 steps to control air flow

GPS Registered

Share This Page

Log in or Sign up

Model Airplane News: Keep it cool: 10 steps to control air flow

GPS Registered

Share This Page

Useful Searches