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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 11:12 
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where it uses the battery to get up and cruise,


So for most of the flight except for the power off glide to a cornfield?

"Regenerative Descent". ;)
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 12:08 
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"Regenerative Descent". ;)

:clap:


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 14:51 
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In rolling hills, if trying to improve mileage, accelerate going down a hill and coast up the next

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 15:09 
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In rolling hills, if trying to improve mileage, accelerate going down a hill and coast up the next


But you need to make it up the first hill in order to use that system... :lol:

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 15:19 
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In rolling hills, if trying to improve mileage, accelerate going down a hill and coast up the next


But you need to make it up the first hill in order to use that system... :lol:

After 70, it is all up hill

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 18:21 
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A car with a 300 HP engine needs between 10 and 20 HP (3-6%) to cruise at highway speed

Small technical nitpick here (and not refuting any of your other points), but 10-20hp is very low for the a modern car.

An average American family sedan, cruising at 75mph, gets about 25mpg. That means 3gph which translates to about 30-40 hp continuous. If you're driving in hill country then add about 8hp for every 1% of uphill grade (and subtract it on the way down the other side).

:cheers:

I think the 10-20hp figure comes from old engineering textbooks that were written in the 55mph era or even longer ago than that. (It doesn't go up or down exactly by the cube of road speed, because rolling resistance and cooling drag follow a different curve than aerodynamic drag, but it does exponentially increase at highway speeds.)


You're right, my cruising HP numbers probably relate to 50-55 mph not 75 mph so I guess cars use 10-12% max HP in cruise, still well below what airplanes do. IIRC many single engine airplanes require nearly to 50% power just to stay in the air at max weight.
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 17 Aug 2021, 18:35 
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You're right, my cruising HP numbers probably relate to 50-55 mph not 75 mph so I guess cars use 10-12% max HP in cruise, still well below what airplanes do. IIRC many single engine airplanes require nearly to 50% power just to stay in the air at max weight.


Car engines can run at high HP all day, as they do in the Diamonds, provided they are adequately cooled.

Edit: I missed the original reason this was posted, ignore me.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2021, 11:59 
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I will apologize in advance if someone else has already noticed this, as I've likely missed a post or two in this 260+ page thread...

However, I just looked at a web page that made me snort coffee through my nose, and I don't want to be the only person so affected.

I was reading the other thread about the super cheap/high performance/10months from flying design and was inspired to go see the current state of the Moller Air Car.

I believe I have found the primary design influence for the Raptor NG.

Attachment:
886F124F-583E-442A-8A27-0740291AB920_4_5005_c.jpeg


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2021, 18:23 
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Nice can that be considered a biplane?
Be careful of what gets sucked out if the door pops open.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2021, 00:19 
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Nice can that be considered a biplane?
Be careful of what gets sucked out if the door pops open.

At least you will be able to claim multi time when operating them!
Peter just needed a 2nd engine.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 29 Aug 2021, 18:21 
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Nice can that be considered a biplane?
Be careful of what gets sucked out if the door pops open.

Orobably will employ a downward ejection system


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 29 Aug 2021, 18:23 
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Nice can that be considered a biplane?
Be careful of what gets sucked out if the door pops open.

Definitely need to join the upoer wing to the stabilzer.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 31 Aug 2021, 22:22 
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But like Jack pointed out, he DOES need most of the HP in cruise. A car with a 300 HP engine needs between 10 and 20 HP (3-6%) to cruise at highway speed, an airplane, especially one intended to go fast needs 60-80% of the HP used for sea level takeoff. The weight of the batteries will very likely eliminate any possible efficiency gain from a battery/ice hybrid approach. What a battery plus electric fans could do is provide a short duration burst of thrust during an "engine out" landing or EFOTO.


This is all true, but there is another factor. The whole Raptor concept only makes sense because it's a diesel. Diesel is what gives some validity to the claims of fuel economy and range. But making aviation diesels is hard. Only Diamond managed to do it successfully after who knows how much investment, and even those engines are not great. Peter found out first hand that you can't make a good aviation diesel out of a crappy car engine.

But here is the kicker - you can make a decent genset out of a crappy car engine. And it costs much less than aviation engine. And, you don't care about its reliability so much because you have the batteries to keep the motors running for a bit after the engine kicks the bucket. And you can make the engine a bit smaller because you can supplement it with battery power for take-off operations.

Of course, the whole thing with ducted fans and box wing etc. is a total crap and a distraction. This project is about the powerplant, not the airplane. If he would just buy a Velocity kit and outfit it with hybrid propulsion, maybe he would get somewhere.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 01 Sep 2021, 03:22 
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In rolling hills, if trying to improve mileage, accelerate going down a hill and coast up the next

And guess where the speed trap is located...

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 09 Sep 2021, 11:33 
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I just watched most of the NG video. What's the consensus?

It'll be a website full of promises only?
An RC prototype? Will the RC fly?
A full-sized mockup?
A flying prototype? Will it kill someone?
A rip-roaring success that does what Peter hopes it'll do?

Or. . .my vote. . . .we've heard the last of it all.


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