Frank,
I just installed the Horton STOL kit as well as the VGs STC. The stall speeds have reduced around 5 MPH, and Vx appears to now be around 75 MPH instead of 86 MPH (determined experimentally).
Thus, for minimum take-off distance, rotation around 70 MPH and climb at 75 MPH appears to be the ticket, at least until obstacles are cleared. The reduction in take-off distance with the Horton STOL and VGs appears attributable to the slower take-off speed - it takes less time and distance to accelerate to 75 MPH than 86 MPH. These figures were derived experimentally, and are only applicable to my plane - your figures will doubtlessly be different.
Paul Rooy
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Paul
T337C
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