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 Post subject: How to find your corner speed
PostPosted: Mon Jul 05, 2010 6:11 pm 

Joined: Thu Apr 24, 2008 10:54 pm
Posts: 143
Location: Redwood City, CA
Here's a technique for using the BoP play aids to find your plane's cornering speed, i.e. the speed at which it can turn as fast as possible in the minimum distance traveled.

On the Performance Nomograph, draw a line between your plane's maximum safe load (on the left) and its maximum lift (on the right). Both of these are on the ADC. Make a Q-Mark where it intersects the diagonal line, then draw a line from your plane's wing load (on the top) through that Q-Mark to get a KEAS value. That KEAS value is your instantaneous cornering speed. To turn that into an actual speed value, you will need to use the altitude/speed/KEAS nomograph to get the relevant speed at your current altitude.

The idea here is that you want to be pulling as many Gs as you can without damaging the aircraft (max safe load) as slowly as possible. As your speed goes down, the lift required to generate a given load goes up, so by setting lift to the max, you determine the minimum KEAS.

Example: a Mirage III at minimum wing loading (40) can safely pull 8G. Its max lift value is 8. This gives a Q-mark at a point close to the "140" mark on the diagonal line, and a cornering speed of about 350 KEAS. At an altitude of 50, that would be a speed of about 410 knots, which would let you generate about 28 turning points with a 10-tick segment at 8G.

The cornering speed above is the instantaneous cornering speed. When you pull max load at max lift, though, you will lose a lot of speed due to drag, and you won't be able to turn that fast until you get your speed back up. Determining your sustained cornering speed, where you can "turn all day", is more complicated, because you have to vary both your speed and the maximum load you choose such that the output of your engines at maximum afterburner can compensate for form drag plus drag-per-G, all while causing your T-mark on the turning nomograph to move as far down and to the left as possible.

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