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Oscar Grassle's 235/320, with the
ELIPPSE two-blade racing prop, would go 242 mph TAS at 1000' dalt at 3200 rpm,
240 mph TAS at 5500' dalt at 3150 rpm, and 233 mph TAS at 10,000' dalt at 3090
rpm; these were predicted and tested values. With his present modified Great
American two-blade prop he gets about 219 mph TAS at 8500' dalt at 2660 rpm.
The ELIPPSE two blade prop just
designed for a 235/320 is predicted to give 216 mph TAS at 2700 rpm at 14,500'
dalt, 224 mph TAS at 8800' dalt at 2760 rpm, and 230 mph TAS at 2300' dalt, 2850
rpm.
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