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12 Aug 2020, 07:30 [ UTC - 5; DST ]


MRM (Honeywell)



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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 08 Jul 2020, 11:32 
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Joined: 03/05/14
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Company: WA Aircraft
Location: Fort Worth, TX (T67)
Aircraft: 1969 Bonanza E33C
Better than I would guess, but that’s still cruisin.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 08 Jul 2020, 22:58 
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Joined: 12/28/17
Posts: 538
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Location: Washington, OK
Aircraft: Cherokee 180C
Username Protected wrote:
Any guesses on landing speed?

No need to guess, the numbers are easy for anyone to find. The website says the stats are
Max gross: 3,800lbs
Wing area: 167 sq.ft.

Let's say the finished product is a real porker at 5,000lbs and use 1.3 for max coefficient of lift* and use VREF = VS × 1.3

Math says 5,000lbs + 167sq.ft. + CL1.3 = 82 knots stall speed

Multiply VS × 1.3 to get VREF = 107 knots


:shrug:

That's fast for a single but nothing special in the big scheme of things. If we use the suggested max gross weight then the numbers come out to 72 and 93. Sorry to sound like a wet blanket.

If he wants the stall speed to be "61 knots" then that airfoil is going to need a lot of attention.



* 1.3 is a reasonable, conservative number. 1.5 is average for a flapless airfoil a GA airplane, so take away a bit for this being a slightly swept wing on a canard airplane (canard means the main wing will typically never see critical AoA and slightly swept means it won't make quite as much peak lift)

don't canards run a higher stall speed due to their airfoil and wing design over conventional?

160 lb cable tension is pure stupidity. I'm surprised he can move the controls at all.
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 08 Jul 2020, 23:25 
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Joined: 08/26/15
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Location: Florida panhandle
Aircraft: Travel Air,T-6B,CRJ
Username Protected wrote:
Better than I would guess, but that’s still cruisin.

Yep, and it's not inconceivable that a lot of people who can legally fly it (single engine airplane rating) will have had no experience in an airplane with such a fast final. It's not something that is overly difficult to learn and adapt to, but it is one more risk factor if the thing ever makes it to market.

Some of the Velocitys "stall" (mush) around 70 knots. This airplane appears to be as fast or maybe a little faster than that.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 09 Jul 2020, 15:56 
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Company: WorleyParsons
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Username Protected wrote:
Big picture, approximate numbers. I don't have the engineering data on this airplane and it seems neither do any of us on this thread.

Peter's entire suite of engineering data consists of just one polar.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 09 Jul 2020, 16:38 
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Username Protected wrote:
Big picture, approximate numbers. I don't have the engineering data on this airplane and it seems neither do any of us on this thread.

Peter's entire suite of engineering data consists of just one polar.

If you're trying to get me to apply for the job, it's not gonna work.


BTW, we made it 58 pages and 8 months in this thread without that word, 'polar.' :D

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 00:30 
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Joined: 05/11/10
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Location: KFIN Flagler, FL
Aircraft: 1991 Bonanza A36
Well, we won't say it any more... bye polar...

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 06:30 
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Username Protected wrote:
Well, we won't say it any more... bye polar...

Hmmmmm.........I’m of two minds on this.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 07:04 
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Aircraft: Velocity XL-RG
latest video is out. It really is like watching a train wreck in slow motion. Apparently there was no safety on the door latch. IMO, an absolute requirement on a door which hinges on the top.

The solution? A hair tie.

You can't make this stuff up. Well, I guess you could, but no one would believe you.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 07:52 
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Username Protected wrote:
latest video is out. It really is like watching a train wreck in slow motion. Apparently there was no safety on the door latch. IMO, an absolute requirement on a door which hinges on the top.

The solution? A hair tie.

You can't make this stuff up. Well, I guess you could, but no one would believe you.


I had to laugh at that “fix” when I saw it. And what in hades is up with that gear retract and drop? I’ve never seen anything like it. The rears just flop down and that weird pulse on the retract. Those huge holes that are left open should be great on the aero. A Velocity XL with TN is going to be just as fast and will have an UL of 1000.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 12:55 
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The hair tie looks like it's good for up to 20 cycles. It doesn't even look like it would prevent an accidental opening of the door handle.

The rest of the video is him playing with the gear switch. Between the concussive sounds and main gear flapping mid-way through the cycle, it doesn't inspire a lot of confidence.

This guy would be great as part of a build team, but it's not working out as a solo venture.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 13:55 
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Joined: 12/22/07
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Location: KPTK (SE Michigan)
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Username Protected wrote:
This guy would be great as part of a build team ...

No. Nope. Non. Nein. Nyet.

Peter does not listen. If you assigned him a specific task, would you actually trust him to do it precisely as specified?

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 16:03 
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Username Protected wrote:
This guy would be great as part of a build team ...

No. Nope. Non. Nein. Nyet.

Peter does not listen. If you assigned him a specific task, would you actually trust him to do it precisely as specified?


Exactly!!! I wouldn’t trust him to build anything except maybe a complicated Rube Goldberg device with no real purpose, no lives at stake, and no need for it to last much more than a couple of cycles.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 16:09 
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Joined: 03/05/14
Posts: 2101
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Company: WA Aircraft
Location: Fort Worth, TX (T67)
Aircraft: 1969 Bonanza E33C
Hair tie


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 11 Jul 2020, 21:53 
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Joined: 05/13/14
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Username Protected wrote:
... him to build anything except maybe a complicated Rube Goldberg device with no real purpose...
I think he's checked that box.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 13 Jul 2020, 15:23 
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Aircraft: N100L 421C
I am sure its an aviation approved hair tie, I bet he bought it at aircraft spruce.

I was pretty surprised that was his solution and that he was comfortable sharing it on the video. I kind of expected he would laugh and say just kidding.

He would have been better off with a Zip tie, bailing wire, or duct tape. At least we would relate to that, but hair tie? LOL

Mike

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