Stalls & Stick Raps - Flt 005 - Hakan's Fowler Flap Lancair - Last flight before flap testing
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- Опубліковано 29 жов 2020
- 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
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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 - Авто та транспорт
The flutter testing quick cut had me in stitches.
Thanks, glad you dug it
Dude you are killing it with those sounds effects lol
Hahhaha, it’s not too much?
@@utopiasnow No, this is what the kids love.
@@utopiasnow Only thing missing were fart sound effects and my day would be complete haha
Loved the editing on this one! Really enjoyed it. The intercom audio was a bit quiet but otherwise amazing as always!
Airplanes are cool!
Thanks George!!
Another awesome video. Love it
Thanks man!!
Just when I was wondering how to spend Friday evening after a me262 documentary. Perfect timing!
Thanks man
Great video 🤙🤙🤙
Glad you enjoyed Thanks for coming along!!
Great work! Ill be taking a lot of your procedures for my test flying.
fantastic
thanks for sharing such interesting content!
Glad you enjoyed it! Thanks fro coming along!!
'is he still alive...'
"thanks for that. '
🤣🤣
haha yeah
Always love your videos! Really makes me think about how even in my not-so-cool kind of flying that there's many opportunities to sit down and break down the sequence of events pragmatically and discuss the potential threats that may interfere with the mission objectives. Looks like you guys had fun in MI too!
Thanks man!! Glad you liked it. Michigan was good.
Good for Mr. Hakan! Lot of work there! Again impressed with the SA on the entire event! Thanks for sharing Elliot! 8) --gary
So stoked!!
Really appreciate this stuff, Im no test pilot but did fly my Sonex today...thanks for all the effort keep it up.
sounds like a good day to me!!
Congrats! I'm a few weeks out from first flight of my Sonex. Can't wait to join the club!
@@noelwade Super! I really enjoy mine look me up on the sonex form I'm from Bozeman MT...
@@gi8323 - Nice! Some friends of mine in Bozeman fly sailplanes & King Airs. If I get over there next year I'll have to swing by!
Very enjoyable again! Thanks heaps Elliot, looking forward to the next. I used the captions for the comms which helped . It was a bit quiet but I always generally go back over those parts anyway before I get the full gist (unfamil with ATC jargon as I'm not a RL pilot, accents, speed of talking etc). Not a crit! by the way! Great editing too.
Thanks man
Yes indeed, flight #5 felt like a win..! 👍
A win for sure!!
A satisfied customer . That's another tick on the checklist.
One step forward
Testing planes is really Cool.
Well spoke!
this is the first in the Serie i can say: positive rate!😐😄👏🏻
Stoked!!
I love the video! I’d give anything to have one of these planes!
Thanks man, you should build one!!
@@utopiasnow I would love to be able to one day! They are such sleek aircraft. Someone has one in the hanger next to a friend of mine. Right now with my wife and kid I’d like to be able to build an RV-10 to fit my mission, but a Lancair would be a blast!
Hoosier Pilot RVs are fun too. Sounds like you have a plan!!
@@HoosierPilot Just order the tail and get going. I built a 10, now I'm going to build something fast!
@@_Stark I wish I had the time and money to get to work on one. For now I’ll just have to bank on winning the AOPA sweepstakes plane 😂
It takes a lot of guts to stall such a fast plane without a slip indicator (ball)! 😳 No wonder the wings dropped? Even with a ball, that's pretty hard to fight in a Lancair? 😉
It was a great day!!
@@utopiasnow Exciting job, you have! 😎
I did some of my multi checkride at Ramona, looked like there are a ton of cool planes there.
For sure a cool place!
great music
Enjoyed the flight, loved the video, learned a lot as always and will watch again, and maybe again to pick up more. But wonder if the addition of a yaw string in the absence of a ball would be an easy and quick thing to do in advance of these type of flights, (in hindsight or for future projects)? Seems a cheap way to add confidence, or is it not really needed?
There was a yaw string on flight 6 ;)
Nice work 👍
I'd like to request a half second or so more on the still cards inserted throughout the video. I thought I was a reasonably fast reader but was struggling to keep up. 😳
Thanks man. My thought was people would pause if they wanted to read. But that may be aggressive.
Haha I did have to pause to read the cards, but that's after backtracking a bit. My reflexes definitely failed the test 😆
Yeah, a second more on the cards - enough to hit the spacebar - would be nice... but otherwise good show! Can't wait 'til those big flaps come down. Monster Fowlers for the win!
G’day!! Great work with everything.
May I ask a favour? Could you tell us more about the chaser aircraft, what is it? I thought I knew them all!
Love your work, mate.
Tango Two, built by Justin Gillen
Eliot, you really have this format down!!!! :D Thank you for sharing this!
The only note I have is to lessen the difference in volume in the office sections and in flight audio, but I can turn my volume knob up and down. :)
Thanks man. I appreciate the feedback. The volume thing is some new comm cables I bought, I wrestled with the edit for a week trying to fix it and finally gave up. My apologies for any ear blasts. Airplanes are cool
@@utopiasnow Thank you for trying! I'm definitely glad to see this test program, and to see it really getting going now.
Great vid, as always.
Since you occasionally perform tests alone (in the sense that you are the only one there from Wasabi), have you considered a gps tracker to carry with you in your flight suit?
Stating your location by comms seems risky, especially since the comms are perhaps difficult for non-flight-test ears.
Otherwise, switching on your phone's live tracking (through maps, or even whatsapp or something), is for sure a nice back up.
Even if the signal might not be good at high altitude, the moment you'll need it - hanging from your parachute - it is likely to work.
Thanks for the comment. Yes the cell phone is a must. Another reason we like chase on high risk flights.
do you know by chance what motor you stuck in that thing?
As always sweet vid Elliot. I like the edit style as well. Keep it up. How can we get some t-shirts to Australia? I went on the site but they only ship to USA?
Thanks man. I haven’t got a good solution yet for shirts in Australia. My apologies.
Postage from the US to Australia sucks. So frustrating.
Opening up the envelope on my Long Ez with stick raps was by far my most nerve-wracking test flight, more so than the first flight, I think. Of course, that was in 1986, so a few brain cells have atrophied since then.
Sounds like a good time!!
Always enjoy your videos, I'd suggest adjusting the volume levels for the voice-overs to the inflight audio. 👍✈️
Yeah there was a problem with the audio cables on the flight. I apologize.
@@utopiasnow No worries just pointing out stuff to make your videos even better. Not sure what editing software you use but it is fairly easy to adjust volume levels that way.
zmatt thanks, yeah the radio track is as high as I could get it. I fought with it for a week, and finally just released it. My apologies.
@@utopiasnow Yea I think it was because of the loud static in there. Still a great video.
Another great video, but I do have a request. I listen with headphones on, so volume is critical to me. Could you please increase the radio volume level to more closely match your narration volume. If I turn it up to hear the radio better, I get blasted out when you go back to narrating. Thanks for your great videos.
Thanks Bart, there was a problem with the comment cables so unfortunately that was as loud as I could get the radio track in the video. My apologies, I know it’s annoying. I think I have it fixed for the next one.
That's awesome Elliot, thanks.
stick or control RAP: quick, sharp pulse input to flight control system, sometimes by striking the yoke or stick.
😎
I'm late to this series and didn't see this question elsewhere, but were you doing stick raps without a chute, or was that an editing flub?
Love your content, but it'd be nice to eliminate some of the repetition in the pre and post flight briefs. Your commentary is very educational.
Despite having a glass cockpit, I would definitely have an inclinometer! ("Keep that ball centered!")
Woot woot!
Are you still doing work on the Raptor? Or is Peter now on his own? I saw he made a first flight, could barely hold altitude. I hope he gets it all figured out.
We haven't heard form Peter in a while. Super excited to hear he has made progress, especially after so much hard work. Thanks for the comment.
The first two times it stalled in the right-wing dropped is odd because you're right aileron was up. Your third stall more matched your aileron position with the left wing dropping. Is that an indication that your ball was not centered as you mentioned in the video?
Yes
Did I hear correctly 14:34 that this plane doesn't have a turn coordinator/slip indicator? Why not? What about a HSI? Surely he's going to drop some proper avionics into it at some point, correct?
There was a yaw string on flight six. ;)
6:40 Where are the links for the Stick Raps info?
Do you carry a PLB in your flight suit in case you have to jump out? And why no slip ball????
I don’t, Justin does. Good thought tho.
So at 170 that is 195.63251 Miles per Hour was that in a shallow dive ?....Thanks my friend...Fly safe...Blessing to you and your family.....
Thanks for the comment. That was level at 8k at WOT and 2500 rpm.
no slip-skid indicator?
There was on flight 6 ;)
Is a stick wrap a pulse or a step input. I thought they were Dirac impulse input.
The idea is a step input to excite the widest range of frequencies in the structure.
@@utopiasnow I get that, learned it modelling step functions with Fourier functions. I'm studying autocontrol currently (mechatronics engineering student in Australia - want to engineer myself into aviation) and we're using step functions in feedback transfer functions which a very different effect. It's not what you're doing as you're disconnecting the feedback loop.
I guess I'm asking why you regard the stick wrap as a step and not an impulse? Is the deflection not short enough to behave like delta function?
@@utopiasnow As an aside, I can see that you're checking each axis and control input. in 5kn increments. How do you respond in the plane if one of the wraps initiates an undamped or divergent oscillation? Is there a response that works or is the divergence going to increase too quickly and you have to bail?
The short answer is you likely won’t catch it before the airplane scattered. However the idea is that you can feel the damping change with speed and knock it off before it goes undamped. Either way it’s better to scatter yhe airplane on a flight test day at altitude over the airport l, than descending below a layer with the lady in the right seat on the way to grandmas for thanksgiving. Thanks for the comment.
@@utopiasnow yeah scattered in testing is quite preferred. I just wondered if you had enough warning to dump power and airspeed before it scattered. Sounds like damping reduces gradually but instability is very fast.
shoutout to the 5 disgruntled people who took the time to thumbs down
I hope you enjoyed the video Rory!!
Elliot Seguin always man!
it was 180kt flare?
Mahan Ehsani I don’t understand the question.
@@utopiasnow at the end of the dive, you said: 180 flare, its not going faster?
180 Kts clear I believe was the call
@@utopiasnow clear, thank you!
#XLiOnNow ⇚ yo check outt my buddy X LI, he's a lit rap artist!! Many kno him as the president of asia. ⚡️👲🏻🇨🇦
I dislike the editing style (unrelated family scenes, abrupt transitions, moving forward and backward in time) but the flight test content makes up for it.
Thanks for the feedback
Thanks for the honest feedback!
I disagree.. the kid stuff is cute.. I’m fine with it. It shows he’s got a family, and he’s making safe decisions with going home to them in mind. I could do without the sound effects, but they were kinda funny. Overall great entertainment.