Steve Smith and Bob Mills have been very busy at the HP workshop getting the tapered carbon fiber wings
onto Bob's Rocket Six in time to turn laps at the NCAR Reno Air Races.
But we've finally made time to do some comparison testing between the HP racing wingtips and the stock W715-1 wingtips. We did Kevin Horten 3-leg GPS triangles at four different altitudes (6000, 7500, 9500, 11500 MSL), first with the HP tips, then with the factory tips two hours later.
As expected, we found a solid 3-knot improvement at 6000 feet, and the data graph points to more at lower altitudes. The crossover altitude appears to be right around 11,000 MSL.
We also tested the stall speed, and found that it was only about 2 knots IAS faster with the short tips.