At 04:58 PM 3/27/2014, you wrote: >I mainly need to reduce the size of my engine air inlets. >++++++++++++++++++++++++++++++++++++++++++++ >What are the benefits you will gain from decreasing the inlets? >And will it effect cooling? >_+++++++++++++++++++++++++++++++++++++++++++++++++++
The greatest percent of airframe drag comes from engine cooling. Any additional air rammed through the cowling over what is necessary to cool the engine is just additional drag. Ideal airflow is a high pressure on the top side, low pressure on the bottom side and outlet, and no more air than necessary. A plenum better directs and limits the amount of air needed for cooling, thus reducing drag and increases cooling efficiency. I started with what was supposed to be an 0-200 cowl. I had to considerably modify the cowl and one mod was to cut down the inlet holes at least 1 1/2 inches on each side. I still have very good cooling, even without an oil cooler. Larry Flesner
