The Sailplane Design Program calculates the performance of radio-controlled sailplanes. The software is written for the MS-DOS and Windows 9X operating systems. Download the current SDP manual here! (675 KB download, 20 page .PDF file)
Here are a couple of screen shots of performance maps that the software generates... Below is the Sagitta 900 SP (see the page on RC Models for a description):
Below is the performance map for the Frisky II (another design described in the RC Models section):
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