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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 09 Nov 2019, 20:54 
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I hate it when someone rips out pages of a book and then wont tell you how it ended.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 10 Nov 2019, 21:45 
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Perhaps this thread is now ...

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 10 Nov 2019, 21:52 
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OK, I give up. What happened??

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 10 Nov 2019, 22:21 
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 10 Nov 2019, 23:09 
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I am asking because I have no idea... but how hard would it be to take that motor off of the raptor and replace it with something that is already tested and proven? How many hours would that take? What motor could be used?

If Peter did that then he could possibly keep working on this motor on the test stand and developing it and working out all of the bugs. At the same time he could start to fly the raptor and get some basic test data and start building hours. Personally there are just to many queston marks with this project at this point to see anyone wanting to fly it with the current power plant. Maybe he will find someone to do it, but I suspect he is going to have to do it himself at some point and I think that is a huge mistake as well.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 01:43 
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The Celera 500 apparently flew for the first time this week. Size differnces aside, could this possibly achieve the type of breakthrough gains that the Raptor project was/is trying to deliver.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 02:11 
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I am going to miss Chris Close... or who ever he was.
oh yeah, Fly Raptor, Fly...

and I really hope that the test pilot takes his time on the preflight.... :ohno:

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 06:15 
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OK, I give up. What happened??

That cat moved on to another sandbox, I suspect.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 08:56 
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The dreaded reverse polarity


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 09:43 
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I have never heard of the Celera 500 until today. I don't know anything about it but to me that this is UGLY. Maybe I am the only one.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 09:55 
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No, it's ugly. :)

And it's going to have to takeoff and land on an almost flat attitude given the location of the main gear and the prop clearance.

I'm really curious about the planned 400kts at 65,000' with 30-40MPG with a prop and reciprocating engine. I thought a turbines are most efficient at those altitudes.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 11:24 
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Username Protected wrote:
No, it's ugly. :)

And it's going to have to takeoff and land on an almost flat attitude given the location of the main gear and the prop clearance.

I'm really curious about the planned 400kts at 65,000' with 30-40MPG with a prop and reciprocating engine. I thought a turbines are most efficient at those altitudes.


Don,

I am way outside my wheel house. From what I understand from physicists and mechanical engineers; there is currently no hypothetical or theoretical turbine which can match the fuel efficiency of a piston. The problem with piston engines is the complexity and the associated reliability issues.

Assuming I follow the logic; when you have a flame front and the associated expansion of the fuel in a piston you push against a defined container with solid surfaces. While in a turbine, the flame front is pushing against air. Air offers significantly less resistance, therefore it has less ability to convert to mechanical energy.

Tim


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 13:36 
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There is a thermodynamic limit here as well....

A piston engine can burn the fuel at much higher temperatures as the burn is intermittent.
The turbine being a continuous process its hard to get the high burn temperatures...

The Heat engine efficiency is related to the difference between the peak temperature and the heat sink or dump temperature in any heat engine.

While not exactly related to the otto(piston) or Bryaton(Jet) cycles carnot is the theoretical upper limit in possible heat engine efficiency,

eff=(1-(Tcold/Thot))
Where temperatures are absolute temperatures.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 14:23 
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Username Protected wrote:
I have never heard of the Celera 500 until today. I don't know anything about it but to me that this is UGLY. Maybe I am the only one.

I hadn’t either. In my book, Otto Aviation Group is going about this the right way: don’t make any announcements until you have something concrete to announce. I wonder where they are getting their funding?

FWIW, I don’t think the Celera is ugly but I can see why some hide-bound traditionalists might think so.
:bud:

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Nov 2019, 14:53 
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Username Protected wrote:
I have never heard of the Celera 500 until today. I don't know anything about it but to me that this is UGLY. Maybe I am the only one.

I hadn’t either. In my book, Otto Aviation Group is going about this the right way: don’t make any announcements until you have something concrete to announce. I wonder where they are getting their funding?

FWIW, I don’t think the Celera is ugly but I can see why some hide-bound traditionalists might think so.
:bud:


Am I the only one with a Celera flashback to the X-1?
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