Low or High Pressure Exits?
Hans,
Any update on this? Thanks
Not yet, I have been doing some other things, but it is a little further along. I am going to build a water manometer like this
to measure pressures inside and outside the cowl to determine placement of the louvers. You hot glue sponge to the ends of the tubing to keep from measuring speed:
Then put some food coloring in the water, and take digital pictures in different flight regimes
I have been trying to learn some aerodynamics, and I have a question that I need help with. When I measure pressures inside and around the cowl to determine best louver placement, should I go for low or high external pressure? Obviously low pressure will exit more air out the cowl, but low pressure outside the cowl means faster air, so putting slow exit air into the fastest flow will be draggier than exiting it into a slower flow, right? Ideal might be low pressure in a steep climb and higher pressure in cruise.
I wonder how a bunch #40 holes drilled into the cowl at a angle would work?
When I taxi in serious Texas-style heat I feel the need for a controllable flap on top of the cowl as my engine sputters from the fuel boiling in the injector lines. I was stuck on the control scheme for one of these, considering how often the top cowl comes off, but I just realized you could actually attached it to the firewall and make it part of the plane, cutting the upper cowl to fit it.
I have also wondered what to do with the exhaust tips, should I cut them in a line with the subcowl?
Thoughts?
Hans