25 Apr 2024, 17:02 [ UTC - 5; DST ]
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die  Posted: 14 May 2016, 20:47 |
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Joined: 12/10/07
Posts: 8021
Post Likes: +6943
Location: New York, NY
Aircraft: Debonair C33A
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Username Protected wrote: So I am curious, how many folks here would be willing to get into a single engine plane powered by a car engine?  I mean, big companies like CMI etc. have been working for years (quite unsuccessfully) to build an aviation diesel, and this guy is just going to stick an Audi engine in it and fly away?  Don't tell diamond aircraft
Yeah, how many years and millions did it take Thielert and then Diamond to produce a viable engine, and how many problems did it have? And that's with a puny 170 hp motor. If these Raptor guys can make a reasonable 300 hp aviation diesel, they won't need the rest of the plane, they could make many millions just selling the engine.
Too bad it ain't gonna happen.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 14 May 2016, 20:51 |
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Joined: 01/24/16
Posts: 309
Post Likes: +288
Location: Memphis, TN
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Username Protected wrote: Yeah, how many years and millions did it take Thielert and then Diamond to produce a viable engine, and how many problems did it have? And that's with a puny 170 hp motor. If these Raptor guys can make a reasonable 300 hp aviation diesel, they won't need the rest of the plane, they could make many millions just selling the engine.
Too bad it ain't gonna happen. Maybe the EPS folks will have a better chance. There are quite a few aircraft companies banking on their success. Frankly, this Raptor thing seems like a pie in the sky. Physics are just not going to cooperate.
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N108KK Meridian
KNQA Millington
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 14 May 2016, 22:44 |
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Joined: 03/26/15
Posts: 357
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Location: KHSV
Aircraft: SR22
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Username Protected wrote: Use the free heat from the exhaust system to supplement and maintain the coolant temp flowing to the wing. Did someone basically say... Exergy?!? 
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Dan Brown
Yours: Bell 406, EC45, BE20, C182, H60, TEX2, H500
Mine: SR22
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 15 May 2016, 08:26 |
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Joined: 05/23/08
Posts: 6059
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Location: CMB7, Ottawa, Canada
Aircraft: TBM - C185 - T206
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I gave you a +1 Marc. Dont know why you got a -1 from someone else. Im just tired myself hearing about these bogus paper airplane with claims that dont make sense. You cant reinvent physics. What a waist of time. Username Protected wrote: Let's see. It is 15% more efficient than a Cirrus so it goes 50% faster, burning half the fuel, carrying half more weight and it travels twice as far...but it is made out of space age carbon fiber with a state of the art Diesel engine with all the latest and greatest glass cockpit for 1/4 of the price of the Cirrus but we want to get it down to 1/5 of the price. Very doable.
There was a really great little jet that did this a while ago but it's model was one third as unrealistic as this one. How did that work out? Probably a lot better than the Moller car. But wait. We could build a new modern flying car and with a few improvements we could surely put one of those in every garage. How is that one coming. If it is not ready yet maybe we should make that one a VTOL 4 seat car, cause the 2 seat horizontal take off one can only barely fly. I am sure that a 4 seat VTOL one will be much better.
Why spend $3K on a deposit, when I can count on Santa Claus to get one down the chimney way before they get this one done.
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Former Baron 58 owner.
Pistons engines are for tractors.
Marc Bourdon
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 02 Jun 2016, 14:34 |
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Joined: 03/01/14
Posts: 2152
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Location: 0TX0 Granbury TX
Aircraft: T-210M Aeronca 7AC
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Username Protected wrote: So I am curious, how many folks here would be willing to get into a single engine plane powered by a car engine? I mean, big companies like CMI etc. have been working for years (quite unsuccessfully) to build an aviation diesel, and this guy is just going to stick an Audi engine in it and fly away? I've flown behind a Subaru powered CH650 and several VW powered airplanes. I think the VW has been proven to be reliable for sure in a single place airplane and possibly in Dave Thatcher's CX-5 which is proving to do a good job in a tandem. Time will tell and I'd love to see someone crack the code for much cheaper/reliable powerplants.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 06 Apr 2017, 13:25 |
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Joined: 11/24/11
Posts: 76
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Aircraft: Mitsubishi Solitaire
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I don't think his numbers are that ridiculous. Remember he's giving TAS at 25,000 feet and does say IF their engine can produce the rated power at that altitude. The SR22TN does something like 220 KTAS at 25,000 feet, he's claiming 230.
There's no magic in the aerodynamic design, it's all about whether he can meet the engine performance and fuel consumption goals. I think that's unlikely, but I applaud the effort.
Nathan
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 07 Apr 2017, 08:33 |
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Joined: 08/10/14
Posts: 1734
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Location: Northwest Arkansas (KVBT)
Aircraft: TBM850
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Username Protected wrote: I don't think his numbers are that ridiculous. Remember he's giving TAS at 25,000 feet and does say IF their engine can produce the rated power at that altitude. The SR22TN does something like 220 KTAS at 25,000 feet, he's claiming 230.
There's no magic in the aerodynamic design, it's all about whether he can meet the engine performance and fuel consumption goals. I think that's unlikely, but I applaud the effort.
Nathan 230ktas on 7gph - the max projected speed at FL250 is 300ktas which will be a bigger feat. The plan for doing this is to use a compound turbo (explained in some of the videos) to create enough boost to maintain HP at altitude. This seems like a reasonable approach but begs the question - why don't other manufacturers already do this? That said, even if it only goes 250ktas, that would still be pretty sweet.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 07 Apr 2017, 09:08 |
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Joined: 12/03/14
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Location: KEHR
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Username Protected wrote: 230ktas on 7gph That's like saying the next Corvette will get 75 MPG. Mike C.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 07 Apr 2017, 09:18 |
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Joined: 08/26/15
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Company: airlines (*CRJ,A320)
Location: Florida panhandle
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Username Protected wrote: The plan for doing this is to use a compound turbo (explained in some of the videos) to create enough boost to maintain HP at altitude. This seems like a reasonable approach but begs the question - why don't other manufacturers already do this? Maybe they think it's a niche market and capable as this machine may be, it won't sell like hotcakes because the market (light airplane that cruises in the mid-twenties) simply isn't big enough?  I'm just speculating- I don't know either.
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Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die Posted: 07 Apr 2017, 09:50 |
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Joined: 11/07/11
Posts: 724
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Location: KBED, KCRE
Aircraft: Phenom 100
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Username Protected wrote: 230ktas on 7gph That's like saying the next Corvette will get 75 MPG. Mike C.
It will! (.......in electric mode)
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