27 Apr 2024, 21:29 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 09:16 |
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Joined: 03/17/08 Posts: 6081 Post Likes: +12523 Location: KMCW
Aircraft: B55 PII,F-1,L-2,OTW,
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"...on a part of the prop shaft where there is no damage, no scoring from the other one..."
"...drill bleed holes in the caps so it will hold enough pressure, and slowly upscale those to get enough bleeding but hold enough pressure..."
If the prop shaft is scored, it got hot, and if it got hot, the metallurgy could have changed, and if it is scored, that is a place for a crack to start.
Drilling bleed holes to regulate the pressure might possibly work, unless of course the viscosity of the oil changes with temperature, which it does dramatically.
One thing that scares me about this is how many pilots, whom I share the sky with, don't see the huge problems with this project and continue to be very supportive.
_________________ Tailwinds, Doug Rozendaal MCW Be Nice, Kind, I don't care, be something, just don't be a jerk ;-)
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 14:29 |
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Joined: 03/12/21 Posts: 9 Post Likes: +2
Aircraft: Cessna 172
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I also tried to explain why the turbines used here are too small and also greatly impacting performance. As a data point, my 2.2L Subaru uses a turbine wheel about 10mm larger than Raptor where Raptor should have something around 10mm larger than mine with almost 50% more displacement and around double the HP.
Now move the compressor up to 25,000 feet where in the inlet pressure and density is about 1/3rd of SL conditions and compressor won't process the same mass of air as at SL at the same compressor rpm.
Up high, we need to intake a greater volume of less dense air and compress it back to near SL pressure to feed it to the 2nd stage compressor so it can then increase that pressure to the required value in the intake manifold to make rated power.
There are a myriad of other factors involved but a simple, short video can't cover all those things and that wasn't the intention of this one.
I'll try to touch on some other factors in subsequent videos on turbocharging and intercooling as this seems to be a popular topic. [/i][/quote]
Interesting engine discussion.. but in reference to the Raptor, to be very simple - If you want a successful program you need to choose whether to be an airframe designer or an engine designer...trying to do both at the same time is a recipe for failure.
(not sure who this should be attributed to, but it is a long-standing rule that is very seldom proven wrong)
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 14:47 |
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Joined: 04/26/13 Posts: 19981 Post Likes: +19741 Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: Interesting engine discussion.. but in reference to the Raptor, to be very simple - If you want a successful program you need to choose whether to be an airframe designer or an engine designer... Or if you don't have adequate experience at either, be a program manager and leave the technical details to the experts.
_________________ My last name rhymes with 'geese'.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 15:11 |
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Joined: 05/01/14 Posts: 8804 Post Likes: +13592 Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: and leave the technical details to the experts. But then we would miss out on all of the innovations Peter is going to come up with to defy physics.
_________________ 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: 30 Mar 2021, 15:22 |
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Joined: 04/26/13 Posts: 19981 Post Likes: +19741 Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: and leave the technical details to the experts. But then we would miss out on all of the innovations Peter is going to come up with to defy physics. Yes, it is entertaining, but it doesn't sell airplanes.
_________________ My last name rhymes with 'geese'.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 18:00 |
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Joined: 01/30/09 Posts: 3356 Post Likes: +1965 Location: $ilicon Vall€y
Aircraft: Columbia 400
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Username Protected wrote: Yes, it is entertaining, but it doesn't sell airplanes. Sells delivery positions!
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 18:01 |
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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: But then we would miss out on all of the innovations Peter is going to come up with to defy physics. Yes, it is entertaining, but it does sell some airplanes. FIFY
_________________ FTFA RTFM
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 18:49 |
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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: How many airplanes has Peter sold? So far it looks like 0. Larry and I cross-posted. He did better than I did.
_________________ FTFA RTFM
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 21:10 |
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Joined: 03/17/08 Posts: 6081 Post Likes: +12523 Location: KMCW
Aircraft: B55 PII,F-1,L-2,OTW,
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Username Protected wrote: Yes, it is entertaining, but it doesn't sell airplanes. Sells delivery positions! See my earlier post... Terrifying to me that there are pilots that lack the basic technical knowledge to make a intelligent assessment of the Raptor project.
_________________ Tailwinds, Doug Rozendaal MCW Be Nice, Kind, I don't care, be something, just don't be a jerk ;-)
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 22:03 |
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Joined: 04/26/13 Posts: 19981 Post Likes: +19741 Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: Yes, it is entertaining, but it doesn't sell airplanes. Sells delivery positions! Only in East Darwinia.
_________________ My last name rhymes with 'geese'.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 30 Mar 2021, 22:50 |
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Joined: 12/10/07 Posts: 30849 Post Likes: +10796 Location: Minneapolis, MN (KFCM)
Aircraft: 1970 Baron B55
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Username Protected wrote: More like Thomas Edison, succeeding by failing thousands of times? Edison didn’t try thousands of things that others had already proven to fail. He tried new things. How many other people tried to build a 300+HP redrive with Delrin bearings. Probably the biggest difference between Edison and Peter is that Edison actually succeeded. But both seem to have the notion that you might be able to make something work without understanding the science behind it just by trying different ideas hoping you'll eventually stumble onto the right answer. 's a
But I just read what might be a better catchphrase for Peter: "Failure is not an option, it's a lifestyle.
_________________ -lance
It's easier to fool people than to convince them that they have been fooled.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 31 Mar 2021, 00:00 |
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Joined: 11/22/12 Posts: 2608 Post Likes: +2372 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: Terrifying to me that there are pilots that lack the basic technical knowledge to make a intelligent assessment of the Raptor project. I'm more saddened by those that could, but don't or won't. Like financially savvy people who fall for get-rich-quick cons and pyramid schemes, or romantically experienced ones who fall for catfishing. They would know it's too good to be true if they analyzed it dispassionately, so they don't. It's not that they don't know enough to recognize reality if they see it, it's that they won't look at it. They turn away so they can continue to indulge in the fantasy.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 31 Mar 2021, 00:52 |
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Joined: 04/24/18 Posts: 727 Post Likes: +340 Location: NYC
Aircraft: ISP Eagle II SR22 g2
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Username Protected wrote: But then we would miss out on all of the innovations Peter is going to come up with to defy physics.
Yes, it is entertaining, but it doesn't sell airplanes.
Sells YT ads though...
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