19 Apr 2024, 12:46 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 08 Sep 2019, 12:34 |
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Joined: 06/17/14 Posts: 5003 Post Likes: +1949 Location: KJYO
Aircraft: C-182, GA-7
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Username Protected wrote: <snip Michael’s quote>Applauding the guy’s efforts is OK but it doesn’t change physics. This thing may not actually be capable of flight. If you put enough engines on a brick it will fly, right!?
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 09 Sep 2019, 07:24 |
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Joined: 05/03/12 Posts: 2126 Post Likes: +566 Location: Wichita, KS
Aircraft: Mooney 201
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Username Protected wrote: <snip Michael’s quote>Applauding the guy’s efforts is OK but it doesn’t change physics. This thing may not actually be capable of flight. If you put enough engines on a brick it will fly, right!?
Only if the CG/W&B is reasonable!
Raptor seems to have a lot going wrong. As others have said, I hope nobody dies trying to prove this thing will do what the designer claims it will.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 11 Sep 2019, 17:38 |
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Joined: 07/11/14 Posts: 1195 Post Likes: +312 Location: 46U
Aircraft: C182
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The latest videos show misunderstandings of the nose gear dampening and fixture. I had the same Lancair nose gear on my Stallion and same problem. Fixes are proposed after severe shimmy during taxi. We’ll see...
I once had nose gear shimmy on landing in my 182. It was so severe that I radioed the Tower to advise. Thought I’d be stuck on runway. And then it suddenly stopped. But no tower response as the shimmy actually popped out my transmitting radio! All turned out well —- no damage, had shimmy damper rebuilt.
Blue skies,
Tom
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 11 Sep 2019, 17:49 |
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Joined: 07/11/14 Posts: 1195 Post Likes: +312 Location: 46U
Aircraft: C182
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Note that this nose gear assembly was originally designed in Australia for the early Lancairs and used for later models. The shimmy damper is integral to the post / shock absorber.
The original solution proposed for the Raptor was to add an external Bonanza/Cessna type damper but they are now trying to make the original work with better fastening and a new tire.
For me, these “discoveries” like the damper and destroyed pump motor are shocking so late in the game.
Blue skies,
Tommy
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 11 Sep 2019, 20:59 |
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Joined: 03/15/16 Posts: 450 Post Likes: +346 Location: NC
Aircraft: Looking for one
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Username Protected wrote: Note that this nose gear assembly was originally designed in Australia for the early Lancairs and used for later models. The shimmy damper is integral to the post / shock absorber.
The original solution proposed for the Raptor was to add an external Bonanza/Cessna type damper but they are now trying to make the original work with better fastening and a new tire.
For me, these “discoveries” like the damper and destroyed pump motor are shocking so late in the game.
Blue skies,
Tommy Yeah, it's interesting that he didn't know it already had a damper. Building an aircraft via trial and error seems like a dangerous approach.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 11 Sep 2019, 22:03 |
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Joined: 08/26/15 Posts: 9543 Post Likes: +8779 Company: airlines (*CRJ,A320) Location: Florida panhandle
Aircraft: Travel Air,T-6B,etc*
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Just for a point of reference that's Beechcraft-related, the development work on the Texan II was done at the end of the 1990s but the original nosewheel shimmy damper was found to be inadequate and often quite wanting on anything but brand new airplanes. The collective braintrust in Wichita, Wright-Patterson, and Pax River got an airframe mod figured out and as early as 2012 we had aircraft on the flight line with a "friction collar" in the nose gear assembly that provided additional damping to supplement the original shimmy damper.
I'm not making excuses or justifying anything about the Raptor, not even saying to cut the guy a break, just trying to keep this stuff in perspective on what the industry "experts" sometimes do.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 02 Oct 2019, 00:43 |
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Joined: 03/15/16 Posts: 450 Post Likes: +346 Location: NC
Aircraft: Looking for one
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He’s figured out he can double the injector pressures. He took a tuning class. He’s been fine with 1700 EGTs. This engine is going to grenade on him. Why wouldn’t he get this engine to a tuning expert? This isn’t something you can just play with.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 02 Oct 2019, 06:52 |
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Joined: 05/11/10 Posts: 12403 Post Likes: +11412 Location: Indiana
Aircraft: Cessna 185, RV-7
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Username Protected wrote: Why wouldn’t he get . . . a[n] . . . expert? This isn’t something you can just play with. The question and observation apply to every single part of the project.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 02 Oct 2019, 07:11 |
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Joined: 12/12/10 Posts: 275 Post Likes: +57 Company: PLANELOGIX Location: KRDU
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Username Protected wrote: He’s been fine with 1700 EGTs. This engine is going to grenade on him... I admire his tenacity and enjoy following his channel, but I agree with you guys... I hope his trial and error process does not result in a fatality. In the recent video he was talking about EGTs and he says something to the effect of "... and I've had them up above 2000 degrees so 1900 doesn't bother me." that doesn't seem like a valid reason why 2000 degrees shouldn't bother you. Logic like that is what makes me nervous. Somewhere earlier in the video he says he estimates he's putting out about 220HP. Doesn't seem like a lot of power for a bird that, IIRC, exceeds 3600lbs. I'm not an engineer so maybe there's more to consider than just weight and power in this case. https://youtu.be/8L9e8zReCUg?t=1212
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_________________ PLANELOGIX: Always online and available. Aircraft record ecosystem https://www.planelogix.com
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 02 Oct 2019, 17:01 |
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Joined: 05/11/10 Posts: 12403 Post Likes: +11412 Location: Indiana
Aircraft: Cessna 185, RV-7
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Username Protected wrote: Bless his heart....as we say in the south. When I lived in Alabama, we used to say “if somebody’s blessin’ your heart it means something bad is happening to you!”
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 03 Oct 2019, 02:03 |
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Joined: 06/17/14 Posts: 5003 Post Likes: +1949 Location: KJYO
Aircraft: C-182, GA-7
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Username Protected wrote: Bless his heart....as we say in the south. When I lived in Alabama, we used to say “if somebody’s blessin’ your heart it means something bad is happening to you!” ...specially if someone is fixin' ta say "Hey y'all, watch 'is!"
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 03 Oct 2019, 06:56 |
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Joined: 09/29/10 Posts: 5681 Post Likes: +4873 Company: USAF Simulator Instructor Location: Wichita Valley Airport (F14)
Aircraft: Bonanza G35
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Username Protected wrote: Bless his heart....as we say in the south. When I lived in Alabama, we used to say “if somebody’s blessin’ your heart it means something bad is happening to you!” I recently resurrected the phrase from my childhood in South Carolina during a sim debrief where the student screwed the pooch in fine fashion: “Bless his little heart, he meant well.” The student didn’t see the humor, the other IP almost split his sides laughing.
No charge for two more old sayings.
_________________ FTFA RTFM
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