How Fast is it? - Flt 8 of Hakan's Modified Lancair - Vortex Generators Tufts & Speed Check

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Elliot Seguin
Published at : 06 Jan 2021
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With the airspeed indicator not slow enough for the new flaps we decided it was time to take a look at the fast side of the envelope. Sure VGs help you fly slow but they don't help you fly fast. We removed all the thanksgiving fixins from flight 7 and set out to get a hack at the cruise speed.

Thank you for coming along with us. We at Wasabi feel so fortunate to have customers like Håkan willing to share their work and a vibrant community to share that work with. Thank you for your support.

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Sponsors:
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Butler Parachute: https://www.butlerparachutes.com/

Outline:
00:00 - Opening
00:23 - Introduction
01:33 - Sponsors
02:12 - Flt 7 Recap
05:38 - Mx Performed
06:50 - Preflight Briefing
09:46 - Flight Eight
10:15 - 45° Stalls Power Off
19:18 - 35° Stalls Power Off
25:18 - Flaps Up Stalls Power Off
29:59 - 45° Stalls 10" MAP
35:41 - GPS Cloverleaf
37:13 - Post Flight Debrief
42:08 - airplanes are cool


--Flt 008 Flight Report----

Summary
Flt Date 12/5/2020
Engine Start: 2:30 LCL
Engine Shutdown: 3:45 LCL
Flt Time: 1.3 HRS
Landings: 1
Fuel State Takeoff: Full Tanks
Total Time After Flight: 6.2 Hrs
Chase: None

Data: All stalls required more active Lat-Dir maintenance by the pilot, the missing wingtip VGs had more effect than expected. Alternate static resulted in a minimum indicated airspeed of 0 KIAS.

Cruise power (2500 RPM/WOT) at 8K (Press Alt) resulted in 144 KTAS (or 135 KCAS). At this speed the airplane indicated 126 on ship static. The significant reduction in cruise speed appears to be tied to the engine not reaching full power, likely tied to the throttle/gear interaction seen on flights 7 and 8.

Landing flaps up with an approach at 95 KIAS was adequate.

Power Settings
Take Off WOT/2700
Climb WOT/2500
Cruise WOT/2500

CHT Limit - 440°F Climb
420°F Cruise
Oil Temp - 215°F
VS0 - 57 KIAS (52 KCAS)
VS - 77 KIAS (70 KCAS)
Vrot - 83 KIAS (75 KCAS)
VFE - 110 KIAS (100 KCAS)
VLE - 134 KIAS (122 KCAS)
VA - 157 KIAS (143 KCAS)
VNE - 259 KIAS (235 KCAS)
LLF - +3.8g/-1.52g
(flaps up)
+2.0g
(Flaps Down)


Maintenance Before Flight
Removed tufts from left side of the airplane
Removed left fwd facing tail camera and elevator cameras
Removed outboard aileron VGs
Removed all tufts from the horizontal tail

Planned Flight Profile
Engine Start
Take Off
Initial climb 100 KIAS
First Power Reduction WOT/2500
Climb 125 KIAS to '10.5K MSL
45° Flap Extension
3x Flaps 45°-Gear Down Stalls (Ship Static)
1x Flaps 45°-Gear Down Stalls (Alt Static)
3x Flaps 35°-Gear Down Stalls (Ship Static)
1x Flaps 35°-Gear Down Stalls (Alt Static)
3x Flaps 0°-Gear Down Stalls (Ship Static)
1x Flaps 0°-Gear Down Stalls (Alt Static)
3x Flaps 45°-Gear Down-10” MAP Stalls (Ship Static)
1x Flaps 0°-Gear Down Stalls-10” MAP (Alt Static)
GPS Cloverleaf at Cruise (8k Press Alt, 2500 RPM, WOT)
RTB
Normal approach
Flaps up landing (95 KIAS)

Bailout altitude: Out of control below 5,000
If less than 50% of control remaining RTB
If we can't fly at or below 150 KIAS at 1.5 G with more than 10% of control remaining, bail out.

Squawks:
Recommend different engine monitor with more display area
Recommend different airspeed indicator w/ only knots
Recommend different airspeed indicator ~40 Knots
Brakes Soft
2800 RPM prop governor setting
Idle 1,000-1,200 RPM
Throttle/Mixture moves with gear retraction

Next Steps:
Need to redo performance testing once full power is confirmed. Then after confirming the cruise speed is adequate the program would be complete. In the event cruise speed isn’t adequate I would test stall handling at AFT CG limit, then remove VGs until control and stall speed were only just adequate or until design cruise speed is reached.

#flighttest #pilot #aviation #avgeek #aircraft #pilot #doityourself #elliotseguin #flight #Lancair #testpilot #fly #whyIfly
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