Air through a while in a high pressure area is free air in most aerodynamic shapes. A friend and I have been experimenting with a Hobby Lobby F5B Tiger which comes with such a spinner and we also have a regular spinner. We are not experts with a lot of instruments so we spray the plane with corn starch, fly it and look for patterns in the cs after landing. We are going to experiment with different power substances but we are looking for air separation from flying at different speeds. We have discovered with our home made methods and a flight logger to get power expended while flying are giving us useful data that we can try to turn into information.

We have found two different kinds of experts that have volunteered to help. Number 1 is the guy that already knows the answer and preaches to us. When our tests do not prove him to be correct they we find out that we are wrong. The other more useful one gets involved in discussions and make suggestions and is quick to say the dreaded three words that are lacking in number 1's vocabulary, "I don't know". Our basic

We are finding out that air flow around the spinner and the very front of the fuselage is important by itself and is also important in not messing up the air flow around the wing roots and the first 10 to 15 percent of the wing. Many other get tied up in the wing tips but we are finding out that the wing roots are an important area and might just worth spending some time on the lean what is going on.

The reason for my initial question about spinners is that you may have swapped spinners and found more than just improved electric motor. The reason I'm interested in this is because this solution would work and different speeds, angles of attack and plane orientation with respect to the air flow. Designing an exhaust duct would be easier because in most positions it's under some positive pressure and during the times when it is not then less cooling may be required. A plane going backwards does not spend much time in this attitude and air flow is of less concern.

This leads to another question. Has anyone looked at vortex generators or modifying the surface texture from glassy smooth to rough in areas of flow separation in areas that the corn starch shows changes in air flow?

By putting tape on the wing of the HL Tiger length wise we have kept the top speed but with no changes in the ailerons programming for landing we have cut the approach speed dramatically with much better overall control and greatly enhanced ailerons authority. The strips are 1/16" wide and run the full length of the wing. and is set back at 75% of the chord. We are trying different methods of adding texture to the tape. One of the experts said it won't work. He said this while watching the Tiger land. I guess that because we are too stupid to know it won't work, it did work. The only thing we have to do is improve our coarn starch. We were thinking of moving from 32 bit corn starch to 64 bit with a raid array.

During all this we are hoping that the hole in the spinner is going to prove to be the method of choice along with improved exhausting without a lot of internal dran, in other words getting it out as soon as possible.