29 Mar 2024, 06:15 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 24 Jun 2020, 12:10 |
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Joined: 12/17/13 Posts: 6322 Post Likes: +5522 Location: Hollywood, Los Angeles, CA
Aircraft: Turbo Commander 680V
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Username Protected wrote: I am sad that Airbus stopped eFan development. That looked like cheap multi time!
I think the reality is that all these ducted fan designs look cool and we want them to work (because they look like little jets), but they're terrible from an efficiency point of view. We mustn't forget that Solar Impulse 2 carried over 5000lbs of its own weight on 4x13kW motors. That's like 70hp and a weight-to-power ratio of about 96. Most aircraft we fly around in are around 10-15 ratio. How did SI2 achieve such high weight carrying capacity? Big, slow turning props. Had it had smaller ducted fans that looked cool like jets, that efficiency would have evaporated.
_________________ Problem is the intelligent people are full of doubt, while the stupid ones are full of confidence.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 24 Jun 2020, 13:17 |
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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: But... but.... it has a chute. Who would want to be the first to test out the chute in this pusher??
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 24 Jun 2020, 15:14 |
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Joined: 03/17/08 Posts: 6052 Post Likes: +12360 Location: KMCW
Aircraft: B55 PII,F-1,L-2,OTW,
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Carb failures are an occasional occurrence on the P-51. On many Mustangs we have an emergency fuel switch. When you turn it on, it sprays a gallon a minute into the blower intake. If the carb fails, you pull the mixture to ICO, set the M.P. to 33" and turn on the switch. It runs like a champ. You can pull the throttle back to about 25" and it starts chugging and puffing black smoke, or you can push it up to about 36" and it starts to shake (mild detonation). Fly it to the high key, 3000 foot over the point of intended landing, turn off the switch and do a 360 degree SFO (simulated flame out) pattern and you are on the ground in moments.
It is very simple, a solenoid valve and a fitting welded shut and drilled out to a #40 (IIIRC) hole, and tapped into the induction system. Stone simple, but really reassuring. It would not work on a diesel however.
_________________ 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: 24 Jun 2020, 19:59 |
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Joined: 05/01/14 Posts: 8705 Post Likes: +13324 Location: Операционный офис КГБ
Aircraft: TU-104
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Username Protected wrote: It would not work on a diesel however. No, but I would think it would be possible to engineer something similar. There is no need for spark, so a limited mechanical mode for fuel and turbo waste gate that will give you say 120 hp would up the confidence level. But this would be for a theoretical real plane. I wouldn’t expect the belt drive on the Raptor to last long enough to have concerns about engine reliability. Does it matter if the engine is running if the prop is no longer connected to it?
_________________ 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: 24 Jun 2020, 20:35 |
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Joined: 09/21/13 Posts: 1974 Post Likes: +1192 Location: Wausau WI - KAUW
Aircraft: H35
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Username Protected wrote: But... but.... it has a chute. Does it though? I know it was on the list as an "available option", but I was thinking it wasn't actually on the prototype yet. Might be wrong there though...but I don't see anything in his video list, and that seems like one he'd put in the forefront as a sales hook. (And if it's not installed...there goes a tiddly bit more off that useful load... )
_________________ Be nice - Jim H Be nice, be kind, I don't care, be something, just don't be a jerk ;-) - Doug R
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 25 Jun 2020, 01:49 |
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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: But... but.... it has a chute. Does it though? I know it was on the list as an "available option", but I was thinking it wasn't actually on the prototype yet. Might be wrong there though...but I don't see anything in his video list, and that seems like one he'd put in the forefront as a sales hook. (And if it's not installed...there goes a tiddly bit more off that useful load... )
It’s installed. He has tried to include anything that would be in a production model.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 25 Jun 2020, 09:18 |
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Joined: 05/06/14 Posts: 6540 Post Likes: +7392 Company: The French Tradition Location: KCRQ - Carlsbad - KTOA
Aircraft: 89 A36 TN, 78 Tiger
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Username Protected wrote: It’s installed. He has tried to include anything that would be in a production model.
I don't care who you are..... That 's funny...
_________________ Bonanza 89 A36 Turbo Norm Grumman Tiger 78
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 25 Jun 2020, 09:36 |
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Joined: 12/10/07 Posts: 30432 Post Likes: +10538 Location: Minneapolis, MN (KFCM)
Aircraft: 1970 Baron B55
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Username Protected wrote: Crazy idea maybe, certainly would cost some payload - what about a stowable electric motor that would deploy on demand, one of those used by motor gliders but scaled up a bit? Like many "crazy" ideas, this one won't get far. Ignoring the little details like a glider needing 1/10 the HP to stay aloft and a significant additional weight for the motor, prop, and retract system you'll need something to power that motor which could outweigh the existing engine.
_________________ -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: 25 Jun 2020, 09:54 |
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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: Crazy idea maybe, certainly would cost some payload - what about a stowable electric motor that would deploy on demand, one of those used by motor gliders but scaled up a bit? Like many "crazy" ideas, this one won't get far. Ignoring the little details like a glider needing 1/10 the HP to stay aloft and a significant additional weight for the motor, prop, and retract system you'll need something to power that motor which could outweigh the existing engine.
You could have one of those small ram air turbines power it.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 25 Jun 2020, 22:06 |
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Joined: 06/17/14 Posts: 4894 Post Likes: +1862 Location: KJYO
Aircraft: C-182, GA-7
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Username Protected wrote: Carb failures are an occasional occurrence on the P-51.<snip> ...but the P-51 doesn't have a chute! I don't want to fly in a single without a chute.Actually, my bucket list is spending some of the kids' inheritance on a donation to some museum for one of their P-51 rides. However, the Raptor is not on the ol' bucket list.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 25 Jun 2020, 23:24 |
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Joined: 05/11/10 Posts: 9261 Post Likes: +11837 Company: ? Most always. I like people. Location: KFIN Flagler, FL
Aircraft: 1991 Bonanza A36
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Username Protected wrote: Carb failures are an occasional occurrence on the P-51.<snip> ...but the P-51 doesn't have a chute! I don't want to fly in a single without a chute.Actually, my bucket list is spending some of the kids' inheritance on a donation to some museum for one of their P-51 rides. However, the Raptor is not on the ol' bucket list. With you Bob.
The Raptor may be the bucket...
_________________ Bible In Poems BibleInPoems.com BNice
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