Initial tests using the digital wind tunnel show marginal streamline improvement
with a maingear wheel fairing installed; same with the speed kit. the factory
standard lower engine cowl on the classic generates around 25kg of lift from
the exit chute, i haven't run tests on the xs cowl to compare but it would be
around the same... the maingear when retracted sits within fairly still swirling
air when retracted and so affects drag very little. From experience i would
say the maingear cowl would reduce turbulence dB noise more than anything.
Deleting the lower engine cowl chute improves forward performance with the loss
of that 25kg lift and exit suction for engine cooling; maingear fairing works
well in this scenario however the current shape is not optimum... Rear wing
root fairings offer the best performance increase but only within a small AoA
band with the flaps retracted. I have been toying with a STOL wing design which
is proving very affective far.
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