Elliot Seguin | Stalls & Stick Raps - Flt 005 - Hakan's Fowler Flap Lancair - Last flight before flap testing @utopiasnow | Uploaded 3 years ago | Updated 3 hours ago
Expanding the slow and fast sides of the envelope and getting a handling qualities baseline before we begin testing the custom flaps on Hakan's modified Lancair 320.
Flight 5 happened the same day as flight 4. Since we had finally been able to get the engine to cool well enough to fly the entire first flight card (on flt 4) it was time to get a baseline (on flt 5) before we started flap testing. These huge Fowler type flaps are the result of tremendous engineering and fabrication effort on Hakan's part and it's super exciting to be wrapping up the last bits before that fun testing.
Thank you for coming along with Wasabi Flight Test. We hope that there are lessons learned in this video that can be applied to your aircraft projects. We would love to help you with your flight test project, give us a call. Thank you!
Website: www.wasabiaero.com
Patreon: www.patreon.com/ElliotSeguin
Tshirts and More preferredaltitude.com/collections/wasabi-air-racing
Instagram: www.instagram.com/edseguin
Facebook: www.facebook.com/WasabiAirRacing/notifications
Sponsors:
Method Seven Eyewear: methodseven.com
Butler Parachute: butlerparachutes.com
Timestamps:
00:26 Introduction
01:18 Preflight Briefing
01:34 Preflight Briefing - Comms...
02:15 Preflight Briefing - Debris on runway flt 4...
03:27 Preflight Briefing - Overview
04:03 Engine Start - Takeoff
05:42 Stall capture
06:18 Stick raps and dive testing
07:35 First Dive VA to 170 KIAS
07:44 Why position calls
08:45 First Dive VA to 170 KIAS
09:34 Cruise Check Explanation
09:52 Cruise Check
10:03 Envelope discussion
11:14 Clean stalls discussion
12:40 Clean stalls 1 & 2
14:23 Clean stalls Sideslip discussion
14:54 Clean stall 3
15:45 2nd Dive to 180 KIAS
16:43 Post Flight Debrief
--Flight Report--
Flt 005 Flight Report
Summary
Flt Date 9/22/2020
Engine Start: 9:54 LCL
Engine Shutdown: 10:43 LCL
Engine Start Temperature: 24°C (75°F)
Flt Time: 0.8 HRS
Landings: 1
Fuel State Takeoff: Half Tanks
Total Time After Flight: 2.7 Hrs
Chase: None
Data:
Engine start was normal. During climbout engine would not rev above 2600 RPM. Climbed to ten thousand for the dive test. Stick wraps found the pitch axis the least damped (still very damped). Both roll and directional axis were dead pan. After the dive test we descended to 8,000' for a speed power. At 170 KIAS (WOT, 2500 RPM, 1250°F) it wasn't clear that the airplane was done accelerating so I knowcked it off. Then we climbed to ten thousand for the stall checks. Three stalls were performed (power off, gear and flaps up). The first two were at roughly 70 KIAS and resulted in a right wing drop and no other noticable characteristics, stick still had 20% aft stick remaining, stick force was still positive. On the third stall I led the stall with left rudder and was able to get a pitch bobble and a left wing drop, not to mention the stall speed was closer to 65 KIAS. After the stalls we dove the airplane to 180 with stick wraps to clear the speed envelope for another cruise check. Cruise check speed power at 8,000' MSL, WOT/2500/1350°F, 170 KIAS (215 MTAS). In cruise #1/290°F #2/364°F #3/359°F #4/352°F OT/180°F. During the descent the gear speed envelope was opened to VLE (122 KIAS). Landing was nominal.
Power Settings
Take Off WOT/2700
Climb WOT/2500
Cruise WOT/2500
Engine Limits
CHT Limit - 420°F Climb
400°F Cruise
Oil Temp - 215°F
V Speeds
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
No changes, no fuel added, no oil added
Planned Flight Profile
Engine Start
Take Off
Initial climb 100 KIAS
First Power Reduction WOT/2500
Cruise climb 125 KIAS to 10,000’ MSL
Dive to 170 KIAS w/ stick wraps on 5 K centers
Descend to 8000' for cruise power check WOT/2500
` Climb to 10,000 at 125 KIAS
Stalls - clean, power off
RTB
Normal approach
Flaps up landing (110 KIAS)
Squawks:
Recommend different engine monitor with more display area
Recommend different airspeed indicator w/ only knots
Brakes Soft
CHT split large
#1/290°F #2/364°F #3/359°F #4/352°F
Peak CHT 417°F (OAT 75°F)
Peak OT 180°F
Next Steps:
Flap testing.
-- End Flight Report --
Thank you for reading this far down. We feel fortunate to do this work and fortunate to share it with you. Let us know if you see something we missed.
airplanes are cool
#baffling #experimentalaircraft #aircraftmechanic #tools #builtnotbought #flight #testpilot #aviator #aviation #aircraftengine #horsepower #fly #whyIfly
Expanding the slow and fast sides of the envelope and getting a handling qualities baseline before we begin testing the custom flaps on Hakan's modified Lancair 320.
Flight 5 happened the same day as flight 4. Since we had finally been able to get the engine to cool well enough to fly the entire first flight card (on flt 4) it was time to get a baseline (on flt 5) before we started flap testing. These huge Fowler type flaps are the result of tremendous engineering and fabrication effort on Hakan's part and it's super exciting to be wrapping up the last bits before that fun testing.
Thank you for coming along with Wasabi Flight Test. We hope that there are lessons learned in this video that can be applied to your aircraft projects. We would love to help you with your flight test project, give us a call. Thank you!
Website: www.wasabiaero.com
Patreon: www.patreon.com/ElliotSeguin
Tshirts and More preferredaltitude.com/collections/wasabi-air-racing
Instagram: www.instagram.com/edseguin
Facebook: www.facebook.com/WasabiAirRacing/notifications
Sponsors:
Method Seven Eyewear: methodseven.com
Butler Parachute: butlerparachutes.com
Timestamps:
00:26 Introduction
01:18 Preflight Briefing
01:34 Preflight Briefing - Comms...
02:15 Preflight Briefing - Debris on runway flt 4...
03:27 Preflight Briefing - Overview
04:03 Engine Start - Takeoff
05:42 Stall capture
06:18 Stick raps and dive testing
07:35 First Dive VA to 170 KIAS
07:44 Why position calls
08:45 First Dive VA to 170 KIAS
09:34 Cruise Check Explanation
09:52 Cruise Check
10:03 Envelope discussion
11:14 Clean stalls discussion
12:40 Clean stalls 1 & 2
14:23 Clean stalls Sideslip discussion
14:54 Clean stall 3
15:45 2nd Dive to 180 KIAS
16:43 Post Flight Debrief
--Flight Report--
Flt 005 Flight Report
Summary
Flt Date 9/22/2020
Engine Start: 9:54 LCL
Engine Shutdown: 10:43 LCL
Engine Start Temperature: 24°C (75°F)
Flt Time: 0.8 HRS
Landings: 1
Fuel State Takeoff: Half Tanks
Total Time After Flight: 2.7 Hrs
Chase: None
Data:
Engine start was normal. During climbout engine would not rev above 2600 RPM. Climbed to ten thousand for the dive test. Stick wraps found the pitch axis the least damped (still very damped). Both roll and directional axis were dead pan. After the dive test we descended to 8,000' for a speed power. At 170 KIAS (WOT, 2500 RPM, 1250°F) it wasn't clear that the airplane was done accelerating so I knowcked it off. Then we climbed to ten thousand for the stall checks. Three stalls were performed (power off, gear and flaps up). The first two were at roughly 70 KIAS and resulted in a right wing drop and no other noticable characteristics, stick still had 20% aft stick remaining, stick force was still positive. On the third stall I led the stall with left rudder and was able to get a pitch bobble and a left wing drop, not to mention the stall speed was closer to 65 KIAS. After the stalls we dove the airplane to 180 with stick wraps to clear the speed envelope for another cruise check. Cruise check speed power at 8,000' MSL, WOT/2500/1350°F, 170 KIAS (215 MTAS). In cruise #1/290°F #2/364°F #3/359°F #4/352°F OT/180°F. During the descent the gear speed envelope was opened to VLE (122 KIAS). Landing was nominal.
Power Settings
Take Off WOT/2700
Climb WOT/2500
Cruise WOT/2500
Engine Limits
CHT Limit - 420°F Climb
400°F Cruise
Oil Temp - 215°F
V Speeds
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
No changes, no fuel added, no oil added
Planned Flight Profile
Engine Start
Take Off
Initial climb 100 KIAS
First Power Reduction WOT/2500
Cruise climb 125 KIAS to 10,000’ MSL
Dive to 170 KIAS w/ stick wraps on 5 K centers
Descend to 8000' for cruise power check WOT/2500
` Climb to 10,000 at 125 KIAS
Stalls - clean, power off
RTB
Normal approach
Flaps up landing (110 KIAS)
Squawks:
Recommend different engine monitor with more display area
Recommend different airspeed indicator w/ only knots
Brakes Soft
CHT split large
#1/290°F #2/364°F #3/359°F #4/352°F
Peak CHT 417°F (OAT 75°F)
Peak OT 180°F
Next Steps:
Flap testing.
-- End Flight Report --
Thank you for reading this far down. We feel fortunate to do this work and fortunate to share it with you. Let us know if you see something we missed.
airplanes are cool
#baffling #experimentalaircraft #aircraftmechanic #tools #builtnotbought #flight #testpilot #aviator #aviation #aircraftengine #horsepower #fly #whyIfly
