10 Nov 2025, 06:01 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die  Posted: 05 Feb 2021, 08:41 |
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Joined: 07/06/14
Posts: 4051
Post Likes: +2793
Location: MA
Aircraft: C340A; TBM850
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Username Protected wrote: My money is on the redrive. Either that or loss of oil pressure. If it was the redrive, he’ll get it back in the air. If he cooked the engine, that would be quite a setback.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 09:13 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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A Raptor without an engine is blessing to the world and a great extension of Peter's life expectancy.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 09:44 |
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Joined: 05/13/14
Posts: 9118
Post Likes: +7642
Location: Central Texas (KTPL)
Aircraft: PA-46-310P
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Username Protected wrote: My money is on the redrive. Either that or loss of oil pressure. If it was the redrive, he’ll get it back in the air. If he cooked the engine, that would be quite a setback.
How much will a new engine cost?
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 09:59 |
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Joined: 05/01/14
Posts: 9742
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Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: How much will a new engine cost? In dollars or hours? I think the later is likely the bigger setback.
_________________
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 Feb 2021, 10:10 |
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Joined: 11/03/08
Posts: 16895
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Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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Username Protected wrote: Believe what you want, I just design diesel engines for a living.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 10:11 |
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Joined: 03/22/18
Posts: 3724
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Location: Nashville, TN
Aircraft: Lazarus - a B60 Duke
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Username Protected wrote: The issue with running Jet A in a turbo diesel VW engine is the sulfur. The high sulfur content will plug up the common fuel rail among other things after a bit.
You can run it 50/50 and not hurt it (one guy is closing in on 300k miles and hasn't touched a thing doing just that) but more likely you'll need to tweak the fuel system for Jet A. Probably have to re-work it completely. Doable, but you'll lose fuel economy doing it.
The older diesel trucks from the late 90's and 2000's (Cummins in-line 6) like Jet A just fine. The ones with the big smoke stacks sticking out above the bed belching more sulfur into the air than the dump truck in front of you.
Anybody get an update on Peter after today's flight? Hi Rich, Sulfur is a problem for the aftertreatment, but airplane engines won't have that. The fuel system doesn't care. Most industrial engine makers allow unlimited use on jet fuel.
Airplane engines won't. His Audi powerplant as he's using it will.
I have built and tuned Audi/Volkswagen engines on and off for over a decade. They're fantastic engines, always wondered about the aviation aspect of it, but the more modern ones have fairly complicated fuel systems that are prone to issues to start with. Adding sulfur in those lines to clog up the little orifices that create the balanced fuel delivery the newer models have will cause problems eventually.
I'm waiting to hear about the redrive but I didn't know he was getting a rattling. Anyone have a link to that video? I've had a wrist pin turn loose on a TDi before and it does make a distinct sound.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 10:42 |
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Joined: 05/13/14
Posts: 9118
Post Likes: +7642
Location: Central Texas (KTPL)
Aircraft: PA-46-310P
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Username Protected wrote: I'm waiting to hear about the redrive but I didn't know he was getting a rattling. Anyone have a link to that video? I've had a wrist pin turn loose on a TDi before and it does make a distinct sound. He said he found the rattling, and it wasn't the engine. It was something near/on the intake scoop. I guess he didn't have it "dialed in."
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 10:47 |
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Joined: 10/07/18
Posts: 3609
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Company: Retired
Location: Columbus, Ohio
Aircraft: Baron 58, Lear 35
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I saw the link to the rattle issue on the HBA site three or four days ago. If In the audio of yesterday’s flight he told the tower he was declaring because of “low oil pressure”. Then a minute or two later he said he had loss the engine.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 10:53 |
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Joined: 08/10/14
Posts: 1798
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Location: Northwest Arkansas (KVBT)
Aircraft: TBM850
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Username Protected wrote: He can’t pressurize it. He cracked one of the windows when he left the front jacked up one time. That’s another problem he’s going. To get to “fix’ during production. I doubt he'll ever get pressurization to work at anything more than a couple PSI (good for a 8000 ft cabin at 12,000 ft). Besides that it's very likely he knows nothing about the subject plus the fact that the shape of his cabin is completely wrong for a pressurized vessel leads me to believe that getting up to a useable 5+ PSI cabin pressure differential without adding another 500 lbs of structure simply isn't feasible.
He tested it to 5psi around 18 months ago before the window cracked (long after the test), door seals leaked but they were aiming for 5.5psi.
https://www.youtube.com/watch?v=x4gs_fZkDWM
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 12:19 |
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Joined: 05/06/14
Posts: 7272
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Company: The French Tradition
Location: KCRQ - Carlsbad - KTOA
Aircraft: 89 A36 TN, 78 Tiger
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That engine had no hope for being a reliable long term option... I am glad that he found out while being in the pattern. The design, the location, the lack of cooling... too many weak links in the chain to be a viable option for aviation. This is not a car, with constant throttle changes. This engine was not designed for that. As good as those engine are, they were not designed for a constant RPM at high torque... Diesel is a good option, but they need to be designed from the ground up. Why would he think that he could do better than Lycoming and Continental, with their large RD department, deep pockets and years of advanced designs...  If those guys have not pulled it off yet, how can a dude in a garage make it happen?
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 12:51 |
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Joined: 04/26/13
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Location: Columbus , IN (KBAK)
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Username Protected wrote: Why would he think that he could do better than Lycoming and Continental, with their large RD department, deep pockets and years of advanced designs... Maybe he's been following SpaceX. Real innovation seldom comes from huge corporate behemoths.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 12:52 |
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Joined: 05/13/14
Posts: 9118
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Location: Central Texas (KTPL)
Aircraft: PA-46-310P
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Username Protected wrote: Why would he think that he could do better than Lycoming and Continental, with their large RD department, deep pockets and years of advanced designs... If those guys have not pulled it off yet, how can a dude in a garage make it happen? I don't get any sense that Lyc or TCM have large R&D expenditures. The engines are not that evolved over 60 years.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 05 Feb 2021, 13:03 |
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Joined: 05/01/14
Posts: 9742
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Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: Why would he think that he could do better than Lycoming and Continental, with their large RD department, deep pockets and years of advanced designs... Maybe he's been following SpaceX. Real innovation seldom comes from huge corporate behemoths.
SpaceX is around 10 times the size of Continental and Lycoming combined.
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