Scott, While your point is correct, the air inlet below the prop is fairly common. Check out many of the older Continental powered airplanes. Champs, Taylorcrafts and Ercoupes come to mind. They have a slot just under the prop to allow cooling air to the bottom of the engine and oil tank. The winterization kit is to cover the opening. In my Continental powered KR, I intentionaly spill air above the air box for oil cooling. However, if you are going to allow cooling air under the engine, you do have to have a little more exit area to produce a more negative area to augment the cylinder cooling.
Jeff Scott On Sun, 14 Aug 2005 13:00:06 -0700 (PDT) Scott Cable <s2cab...@yahoo.com> writes: > Dan, > Something occurred to me as I was looking at your cowl pictures. > You stated that the outbd sides of the slot-scoop are going to > provide cooling air to the bottom of the engine. If you do that, > won't that cause air to stagnate inside the cowling and overheat the > engine? The cooling air from the upper openings behind the prop is > high pressure. By allowing high pressure air to the bottom of the > engine, haven't you effectively shut off the flow of air? To > achieve proper cooling, you'll need high pressure / volume air at > the top / front of the engine flowing into a low pressure area below > and aft of the engine. In other words, you're needing a pressure > differential to achive flow. I think that maybe you should block > off the lower side openings and use the scoop only for carb air, or > at least be prepared to do that during flight testing. > > Dan Heath <da...@alltel.net> wrote: > If you want to see the pics, go to > http://kr-builder.org/Cowl/index.html > They are the first 7 pics and as always, you can click on any pic > for a > larger view. > > > > > Scott Cable > Jamestown, ND > s2cab...@yahoo.com
