Aerodynamic Braking

[Rifleman]

I do it in my models and its unreal how much height you can lose in a slip .....we sometimes make a bet as to how close you can come to the threshold and still be 200 ft high and still not have to go around.....the only thing is, when cleaning up, you need to add a good bit of power in order to translate the fall into forward speed so you can have enough left to flare....it becomes a real square corner at the bottom.......

[OTTOL]

I go out to the R/C field at Markam Park here in Broward county on occasion, and have seen that you really have to be good at getting those things on the runway from a high or low predicament, depending on where you are when the engine runs out of fuel!    Very impressive airmanship indeed.

[Rifleman]

If you think thats impressive, then you should see our runway approaches....on one end, usually the upwind end, due to our prevailing winds here, we have 60'-80' Douglas Firs to use as our " 50' " obstacle to depart over, and on the other end we have a 50' wide gap between them to do our descent through, .....only a very few have followed me in, by slipping down through that gap !

[congo]

A simple "airbrake" in a Twin Astir sailplane (and many
other types of sailplanes) is a panel that rises vertically out of the upper wing surface.

Simple as this sounds it produces a complex set of effects. The following is best observed at a full brake setting.

1. The airbrakes add a lot of form drag which is designed