24 Apr 2024, 07:22 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 04 Nov 2019, 20:29 |
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Joined: 01/18/11 Posts: 7690 Post Likes: +3686 Location: Lakeland , Ga
Aircraft: H35, T-41B, Aircoupe
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Username Protected wrote: What are the qualifications to be a test pilot?
Hours? Years? Obviously time in type isn’t an option?
Aerobatics? Some other training?
Or is it just someone who is crazy enough to take the job? I ho with crazy
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 04 Nov 2019, 20:34 |
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Joined: 05/17/10 Posts: 4434 Post Likes: +1739 Location: canuck
Aircraft: x23mouse
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https://en.wikipedia.org/wiki/Velocity,_Inc. Quote: In 1992, Velocity introduced the "173", also known as the long wing. This model had a longer wing giving it a lower landing speed. The name was a play on the name of a popular model of Cessna, the Cessna 172, the idea being it is one better. Some flying Velocity planes experienced "deep stall" incidents, where the main wing stalled before the canard causing an unrecoverable stall. After a lengthy investigation, Velocity found and solved the cause of these stalls. The 173 included airfoil modifications that prevented the deep stall.[7] The original kit was also modified to prevent a deep stall, and was now known as the Standard model. pg11 Sick of “The Deep Stall” Question??? http://www.velocityaircraft.com/views/V1.pdf
_________________ nightwatch...
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 04 Nov 2019, 22:44 |
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Joined: 02/28/17 Posts: 1214 Post Likes: +1191 Location: Panama City, FL
Aircraft: Velocity XL-RG
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Username Protected wrote: There is a big difference between the first test flights of the Velocity you built and the flight test program Velocity conducted on the prototype(s) before selling you the kit. If I remember correctly, Velocity actually lost one of the prototypes to a deep stall and had to do some redesign. The Raptor will need a similarly thorough and professional test program if the kit is to ever go into production.
Never implied otherwise. Just offering a datapoint. And the Velocity that had the deep stall was not “lost”. It flew again.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 11:10 |
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Joined: 06/17/14 Posts: 5018 Post Likes: +1951 Location: KJYO
Aircraft: C-182, GA-7
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Your story about the ultralight makes me think about two things: That may have been in this person‘s first time flying this model of ultralight or flying in ultralight aircraft. A similar surprise may be awaiting Raptor.
I almost suspect the Raptor aircraft will get airborne quicker than the designer suspects if there is a little wind gust during one of his high speed taxi tests. He keeps tickling the Dragon’s tail.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 12:52 |
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Joined: 05/17/10 Posts: 4434 Post Likes: +1739 Location: canuck
Aircraft: x23mouse
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from the link above (6 posts) titled pg11 Sick of “The Deep Stall” Question??? Quote: There have been four incidents of“deep stall” & one fatality . Here are the facts as explained to me byDuane & Scott: • 1st deep stall Neil Hunter • 2nd deep stall Carl Pascarell • 3rd deep stall Jim Patton • 4th deep stall Neil Hunter (fatal)Let’s look at each of these four situations.
_________________ nightwatch...
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 13:17 |
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Joined: 05/01/14 Posts: 8803 Post Likes: +13586 Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: from the link above (6 posts) titled pg11 Sick of “The Deep Stall” Question??? Quote: There have been four incidents of“deep stall” & one fatality . Here are the facts as explained to me byDuane & Scott: • 1st deep stall Neil Hunter • 2nd deep stall Carl Pascarell • 3rd deep stall Jim Patton • 4th deep stall Neil Hunter (fatal)Let’s look at each of these four situations. 2 and 3 were done intentionally over water with a professional test pilot at the controls. The first one happened to be over water by chance. The fourth occurred after a fix was available but not applied to the accident aircraft. The problem was solvable, as most are, but it needed to be identified and then the wings had to be modified.
_________________ Be kinder than I am. It’s a low bar. Flight suits = superior knowledge
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 13:36 |
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Joined: 05/17/10 Posts: 4434 Post Likes: +1739 Location: canuck
Aircraft: x23mouse
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Username Protected wrote: If the ailerons are a screwed as we think may be possible.. gonna be a short flight...
We need to get to the bottom of this problem? Why? This ain't our problem.
comments at HB
"I learned to fly on dirt and grass strips, never had ailerons do that.
Your reasoning doesn't fly. " -----
"Might have a been the nose oscillation or shimmy causing the wing rock. The aileron flop was secondary. Not flopping in latest video." ------
["I'm now working on getting the aircraft to around 82 knots and holding it there for a few seconds. If I can comfortably do that without running out of runway to stop then it will be time to see if I can get the main wheels off the ground for just a second." ------- "In FAA lingo that is "intent to fly"]
https://www.homebuiltairplanes.com/foru ... ost-500262
_________________ nightwatch...
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 14:13 |
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Joined: 07/06/14 Posts: 3013 Post Likes: +1994 Location: MA
Aircraft: Cessna 340A
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Username Protected wrote: "Might have a been the nose oscillation or shimmy causing the wing rock. The aileron flop was secondary. Not flopping in latest video." I worry that if the issue is by the nature of the design (not correctable by rigging or tension), this is exactly the type of situation that can set up a feedback loop that will cause flutter and failure. If the wings rock the ailerons will deflect opposite the deflection? Forget the shimmy, or the fact that the ailerons were bouncing on the ground -- these are only a sign that there could be a fundamental flaw to be addressed, not dismissed.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 14:37 |
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Joined: 01/30/09 Posts: 6088 Post Likes: +3381 Location: Oklahoma City, OK (KPWA)
Aircraft: planeless
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Username Protected wrote: "In FAA lingo that is "intent to fly" sounds just shy of "intent to die"
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Nov 2019, 19:08 |
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Joined: 10/06/19 Posts: 139 Post Likes: +45 Company: Water Cleaners
Aircraft: Pilatus PC-12 NG
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Username Protected wrote: What I don't understand: in this day and age, even if you're 50+ and you suck at anything remotely close to a computer, get a 20 year old student to do a model of your plane project with Catia, let the sim go for a few hours (that should give you a good hundred thousand runs), and see the results.
You'll know what to expect performance wise, what and where it will break after XX hours, and so on. Fun fact... AVERAGE age of the engineers at Nasa during the Apollo program was.....
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