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Takeoff/stall tests today w/VG's...
OK.. for those who may be interested..
PA 28 -151 Warrior, Mattison seals & VG's, AMD upswept tips, K2U Root fairings...... TOW 1986 (28 gals) Pres, 29.47 Rny 68 ASL, Paved ,330 deg Wind, 3 knts 080 Temp -6 Deg C Rolling start (Mattison procedure) Flaps down (25deg) at 40 knts Wheels off rny, 450-475 feet, watched the 500 ft rny marker go under 10+ feet below us. Repeatable. At 3000 ft, Pwr off stalls with full flaps, and 2 knotches, confirmed at 40 knts indicated Stall with 2 notches flap, full power,(simulated departure stall) - aircraft seems to "hang" on prop shaking badly with a boot full of right rudder, yoke WAY back, stall horn yelping, but no break. Relaxed back pressure, instantly steady and climbing again. With this load/wind, we are now adjusting our approach speed down by 4 knts and IF I planted on the numbers, moderate braking (no squeaking the tires) stopped us before the 500 ft rny marker every time. Some expirementing .. if I could get the stall horn to start to squeak at the threshold I could lessen the "float" through the flare and touching down with the horn on. Stopped that time about 450 ft. Sure is a different airplane! Dave |
#2
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Takeoff/stall tests today w/VG's...
Sure is a different airplane!
Sounds awesome! Now, if only they could do something about how sharp those little suckers are, and how hard they are to clean around... You're gonna need a mushroom brush, lots of Lemon Pledge, and some extra time to keep those wings clean. Anyone make VGs that retract like little speed brakes? :-) -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#3
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Takeoff/stall tests today w/VG's...
Dave wrote:
TOW 1986 (28 gals) With this load/wind, we are now adjusting our approach speed down by 4 knts and IF I planted on the numbers, moderate braking (no squeaking the tires) stopped us before the 500 ft rny marker every time. Q1: Is 1986 the a/c max gross weight? Q2: How did you arrive at the 4 kts number? |
#4
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Takeoff/stall tests today w/VG's...
Dave wrote: Flaps down (25deg) at 40 knts Now go and fly final at 45 knots. That should put the aircraft slightly nose high. Let it fly right into the ground at that speed and attitude. I used that all the time with the 182. |
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Takeoff/stall tests today w/VG's...
That would be nice!
I DID smooth of the edges/corners before painting. Remember, we have only 4 on each side, not the mod with them all the way out the wing... I posted some pix on the Cherokee chat.... Cheers! Dave On 24 Jan 2007 04:01:49 -0800, "Jay Honeck" wrote: Sure is a different airplane! Sounds awesome! Now, if only they could do something about how sharp those little suckers are, and how hard they are to clean around... You're gonna need a mushroom brush, lots of Lemon Pledge, and some extra time to keep those wings clean. Anyone make VGs that retract like little speed brakes? :-) |
#6
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Takeoff/stall tests today w/VG's...
Hi John!
Q 1-- No gross is 2325 lbs.... Q 2 - Lotsa stalls , before and after installation, under the most controlled conditions we could manage. The mods have lowered our stall speed, at all flap settings, by at least 4 knts, so were are adjusting our approach speeds accordingly.... Dave On Wed, 24 Jan 2007 13:49:14 +0000, john smith wrote: Dave wrote: TOW 1986 (28 gals) With this load/wind, we are now adjusting our approach speed down by 4 knts and IF I planted on the numbers, moderate braking (no squeaking the tires) stopped us before the 500 ft rny marker every time. Q1: Is 1986 the a/c max gross weight? Q2: How did you arrive at the 4 kts number? |
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