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12 Aug 2020, 07:39 [ UTC - 5; DST ]


MRM (Honeywell)



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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 23 Nov 2019, 19:39 
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Username Protected wrote:
Are those comments from the same Jeff that worked on this airplane with Peter up till they "finished" it?

Jeff who?

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 23 Nov 2019, 19:45 
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I don't see why some of you even read his stuff or watch the video's? I am amazed at the the positive words being shown to the build. You guys are just to kind to Raptor people.


:thumbup:


I’m afraid it’s like watching a car crash in slow motion. You can’t look away. Positive words....... most will be able to get their money back from escrow (minus the fee). The ones that dropped $20k and/or bought into the company. Well, sometimes when you speculate in high risk/high award ventures, you lose.


I get it, its just sad to see it! I would never buy into something without seeing the finished product. Any body into ROULETTE?

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 23 Nov 2019, 20:27 
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 23 Nov 2019, 21:31 
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Username Protected wrote:
Are those comments from the same Jeff that worked on this airplane with Peter up till they "finished" it?

Jeff who?

Jeff Kerlo

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 24 Nov 2019, 03:59 
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Username Protected wrote:
Are those comments from the same Jeff that worked on this airplane with Peter up till they "finished" it?

Jeff who?


The guy that helped Velocity design the XL.

https://www.linkedin.com/in/jeff-kerlo-00b38b15

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 24 Nov 2019, 04:01 
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In the latest video, he added the weights to the ailerons. The left aileron weighs more than the right because of the trim tab, yet he decided to make the balance weights the same so now the right aileron wants to tip up. :sad:


Some of the stuff he does just doesn’t make any sense. You would think after about tearing the aircraft into pieces, he wouldn’t keep on the “That should be fine” mindset.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 24 Nov 2019, 08:18 
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Username Protected wrote:
In the latest video, he added the weights to the ailerons. The left aileron weighs more than the right because of the trim tab, yet he decided to make the balance weights the same so now the right aileron wants to tip up. :sad:


Some of the stuff he does just doesn’t make any sense. You would think after about tearing the aircraft into pieces, he wouldn’t keep on the “That should be fine” mindset.


This is way too heavy of an aircraft to have this kind of cavalier attitude...
He is in way over his head. Adding weight like this, without calcs... what can possibly go wrong?
"Fixing as you go" shows flaws in the design.
"Improving as you go" is what experimental building is about.
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 24 Nov 2019, 16:39 
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Username Protected wrote:
This is way too heavy of an aircraft to have this kind of cavalier attitude...
He is in way over his head. Adding weight like this, without calcs... what can possibly go wrong?
"Fixing as you go" shows flaws in the design.
"Improving as you go" is what experimental building is about.

Ah, don't ailerons have to be statically balanced about their pivot point? Even if the left and right had different polar moments due to the extra weight of a trim tab, as long as they were balanced there wouldn't be anything causing one to droop statically. And if those ailerons aren't balanced (individually) I'd expect flutter to tear them and/or the wings off at anywhere near the speed this design is claimed to achieve.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 24 Nov 2019, 23:29 
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Ah, don't ailerons have to be statically balanced about their pivot point? Even if the left and right had different polar moments due to the extra weight of a trim tab, as long as they were balanced there wouldn't be anything causing one to droop statically. And if those ailerons aren't balanced (individually) I'd expect flutter to tear them and/or the wings off at anywhere near the speed this design is claimed to achieve.

Lance said Polar....

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 25 Nov 2019, 00:19 
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Lance said Polar....

:coffee:

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 30 Nov 2019, 22:11 
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I've been watching this for some time as well. Primarily for the powerplant as I think he's on to something there, redrive issues aside. Probably needs a gearbox.

If he gets tired of waiting for test pilots and goes and crashes it, hopefully someone has the blueprints to the engine and design. I think it would sell well.

That might be his best course of action at this point. I'm just over here wondering what kind of life of their own those aileron counterweights (that are shaped like airfoils) will take when you start stall testing.

Should be especially fun to have an aileron try to come up just as you enter the stall.

:popcorn:


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 30 Nov 2019, 22:34 
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hopefully someone has the blueprints ...

I am hoping for a merciful hangar fire that destroys the prototype and drawings/plans ...

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Last edited on 01 Dec 2019, 11:23, edited 1 time in total.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 30 Nov 2019, 23:19 
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Username Protected wrote:
hopefully someone has the blueprints ...

I am hoping a a merciful hangar fire that destroys the prototype and drawings/plans ...

What don't you like about the engine? People have been begging for a turbocharged Diesel replacement for a long time. At least the Experimental community could benefit.

I could see one of these engines on a Lancair IV-P doing quite well.

I also like the idea of using the hot coolant piped through the wing and tail leading edges as a full-time anti-ice using the typical Audi after-run coolant pump setup to circulate it.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 30 Nov 2019, 23:47 
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All of us would love a cheap kerosene burner, and a 300 kt four seat pressurized airplane that burns 12 gph...

But my fear is the Raptor engine conversion has been engineered much like the airframe. Building a robust aircraft engine is not easy...

The demands of an aircraft engine are much different than an automobile engine. They are much more like a tractor, and go to the local Deere dealer and take a look at a 300 hp tractor engine. You won't be mounting that on anything that flies.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 30 Nov 2019, 23:57 
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What don't you like about the engine?

You mean besides the intent to have the engine produce significantly more power than Audi intended and do it for an extended time period? How about the poorly designed reduction drive?

Quote:
I also like the idea of using the hot coolant piped through the wing and tail leading edges as a full-time anti-ice using the typical Audi after-run coolant pump setup to circulate it.

I could be wrong but I think you'd need way more BTUs than an after-run pump could possibly deliver. For that matter, I'm not certain that the total wasted heat output of the engine minus what goes out the exhaust could keep the wing and tail leading edges above freezing with a minus 20° C OAT and a 200+ KT true airspeed, especially if those leading edges are just part of the whole wing surface.

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