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25 Jan 2026, 21:52 [ UTC - 5; DST ]


Stevens Aerospace (Banner)



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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 09:04 
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My guess is that designing such a control system is beyond his ability (like a lot of other things).

Apparently just imagining the need for such a system is beyond his ability.

Even if all of the stars aligned and he got this thing to a state where it was flyable and didn't weigh in like an African elephant, there are so many of these design issues that making a marketable kit out of it would still require a huge redesign.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 09:40 
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Username Protected wrote:
...there are so many of these design issues that making a marketable kit out of it would still require a huge redesign.
He's way past thinking of that. He seems to be a 50/50 mix of easily distracted and tunnel visioned. In any case, he appears to be completely "winging" the pre-flight testing. Is there a test program he is planning, running, and recording for each run?


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 10:01 
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Username Protected wrote:
...there are so many of these design issues that making a marketable kit out of it would still require a huge redesign.
He's way past thinking of that. He seems to be a 50/50 mix of easily distracted and tunnel visioned. In any case, he appears to be completely "winging" the pre-flight testing. Is there a test program he is planning, running, and recording for each run?

If so, we're not seeing it.

I think his focus is on demonstrating that it will fly. I don't know what the details of the escrow money are, but whatever he has to do to meet the requirement to get the rest of the money freed up is what he's going to do. My guess is that the language of the document is more along the lines of "upon completion of a successful test flight", perhaps with stipulations on height, duration, etc. My further guess is that it doesn't include performance requirements such as weight, speed, rate of climb, and so on.

So in order to continue to move forward he needs to show that it will fly. He's going to do that come hell or high water. After which time I have no idea what he would do, because he's boxed himself into a corner, but if he has a chance to sell the project or bring in investors to finish the work, he's first going to need to make it fly in a believable way.

Given what I've seen I think that he may be so personally invested in this project that he won't want to let it go to someone else, in which case he's going down with the ship.
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 10:30 
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Aircraft: 1969 Bonanza E33C
2500 ft ground roll to 100 knots “indicated” and it’s glued to the runway.

One person, no bags and light on fuel.

2500 ft! Holy cow!


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 10:47 
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2500 ft ground roll to 100 knots “indicated” and it’s glued to the runway.

One person, no bags and light on fuel.

2500 ft! Holy cow!

Yeah, not to say that's not a bad thing, but the "glued to the ground" is more a function of the weak trim spring allowing the elevator to float up instead of lifting the nose. I have no idea what liftoff speed will actually be, but it may well be right at the calculated value provided that the elevator is actually used to raise the nose.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 27 Aug 2020, 12:55 
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I am very curious about his potentiometer. Is it a simple resistance pot? If so, damn poor choice.


Given that the readout for the calibration was a voltage from 0-5V, it does seem like a resistance pot, and not a digital encoder. My speculation, based on the failure mode illustrated in the chart, is that the pot rotated relative to the lever, perhaps it is not tightened down or otherwise prevented from moving. I would have expected a loose wire to have sent it to zero or full scale.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 00:05 
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Username Protected wrote:
I am very curious about his potentiometer. Is it a simple resistance pot? If so, damn poor choice.


Given that the readout for the calibration was a voltage from 0-5V, it does seem like a resistance pot, and not a digital encoder. My speculation, based on the failure mode illustrated in the chart, is that the pot rotated relative to the lever, perhaps it is not tightened down or otherwise prevented from moving. I would have expected a loose wire to have sent it to zero or full scale.

The "gas pedal" in several Audi's I own or have owned is connected to two potentiometers with one wired to increase the voltage when the pedal is pressed and one that outputs decreasing voltage with increased pedal movement. Chances are the ECU for the Audi Diesel he's using works the same way.
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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 01:44 
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Username Protected wrote:
The "gas pedal" in several Audi's I own or have owned is connected to two potentiometers with one wired to increase the voltage when the pedal is pressed and one that outputs decreasing voltage with increased pedal movement. Chances are the ECU for the Audi Diesel he's using works the same way.

He is not using an Audi ECU. He is using a MOTEC


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 04:15 
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every modern diesel car and every truck you pass on the highway, has a "throttle" by wire. This isn't unusual or difficult, in fact for a an electronic diesel it's the only way it can work.

It's only hard if you start trying to change what works. If you're using an engine from an audi car, bring the controls from the car.A guy in a shed is not going to improve on VW's engineering. Even if using an aftermarket ECM it's still going to be set up for the car control inputs.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 07:15 
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I guess he is not the only one with those ideas...
Successful flights with their prototype. Already have 35 hours.
Laminar flow. Diesel Engine. Long Range. Pressurized.
https://www.ottoaviation.com/celera-500l
Attachment:
Screen Shot 2020-08-28 at 4.12.05 AM.png


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 07:59 
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Joined: 09/13/09
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Location: KJWY - Mid-Way Regional (DFW area)
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New video up. He plans to fly. Wearing a flight suit now and told ATC he was going to do a high speed taxi “but might take it flying into ground effect.”

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 08:26 
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I heard that his flight suit will make him a better pilot. I don’t think we know anything about his flying qualifications. I would certainly be getting a lot of recent experience in a Velocity and a Lancair if I was him.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 08:43 
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Company: WA Aircraft
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Username Protected wrote:
I heard that his flight suit will make him a better pilot. I don’t think we know anything about his flying qualifications. I would certainly be getting a lot of recent experience in a Velocity and a Lancair if I was him.


He’s a CFI. That means he can fly anything, but it has to be from the right seat.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 08:46 
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Joined: 03/01/14
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Aircraft: T-210M Aeronca 7AC
Throttle belongs in the left hand, stick in the right; just not Peter’s.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 28 Aug 2020, 08:54 
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Joined: 05/13/14
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Location: Central Texas (KTPL)
Aircraft: PA-46-310P
Username Protected wrote:
I guess he is not the only one with those ideas...
Successful flights with their prototype. Already have 35 hours.
Laminar flow. Diesel Engine. Long Range. Pressurized.
https://www.ottoaviation.com/celera-500l
Attachment:
Screen Shot 2020-08-28 at 4.12.05 AM.png

First I've ever heard of this. This thing looks like a flying submarine. The claimed numbers are impressive. I hope the wing spar is some kind of carbon nanotube structure, because the wing looks puny.


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