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29 Mar 2024, 11:27 [ UTC - 5; DST ]


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 00:01 
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At least he has not mentioned transitioning to a wing warp design! It works for birds and the Wright Brothers.
Honestly, I hope he gets this figured out and ?succeeds? without a fatality. However, I see way too many unnecessary bends in the flight control path. My fear is he will find out what plastic and cabling can do when they rub together. It will actually take materiel off the control cable. Seizing up was already noted.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 07:56 
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Fly by wires...
Yeah, that makes sense. :eek:
Loose power and it will get interesting real fast.

Ah, no problem! Just install a hydrazine APU!

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 08:21 
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At least he has not mentioned transitioning to a wing warp design! It works for birds and the Wright Brothers.
Honestly, I hope he gets this figured out and ?succeeds? without a fatality. However, I see way too many unnecessary bends in the flight control path. My fear is he will find out what plastic and cabling can do when they rub together. It will actually take materiel off the control cable. Seizing up was already noted.

The inner sleeve is metal.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 08:49 
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His sleeve looks like conduit I’d find at Home Depot with a plastic sheath on the outer diameter.

He needs to take the slop out of the cables. I’m no engineer but he keeps on trying to do so with composite pulley brackets (flex) attached to a skin (flex). A number of AEs keep employing him to use properly tensioned high quality cable in the comment section.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 12:10 
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Username Protected wrote:
At least he has not mentioned transitioning to a wing warp design! It works for birds and the Wright Brothers.

Given all the rest of the design problems, he might already have a warping wing, just not one that can be controlled.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 12:46 
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At least he has not mentioned transitioning to a wing warp design! It works for birds and the Wright Brothers.

Given all the rest of the design problems, he might already have a warping wing, just not one that can be controlled.

:coffee:

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 13:35 
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If i were going to use push pull cables, it would be these.
I have them on my boat , smooth and no slop.
https://push-pull.com/marine/


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 13:48 
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If i were going to use push pull cables, it would be these.
I have them on my boat , smooth and no slop.
https://push-pull.com/marine/


Ever had a frozen throttle or mixture cable? Especially in an airplane intended for higher altitudes and lower temps where condensation during descent is an issue.

Push-pull cables for flight controls are for ultralights, that people other than me are flying.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 14:04 
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If i were going to use push pull cables, it would be these.
I have them on my boat , smooth and no slop.
https://push-pull.com/marine/


Ever had a frozen throttle or mixture cable? Especially in an airplane intended for higher altitudes and lower temps where condensation during descent is an issue.

Push-pull cables for flight controls are for ultralights, that people other than me are flying.


I had one of these cables freeze up on a Citation. scary.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 14:07 
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Image

:D

(Oh, a Citation!)


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 14:21 
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If i were going to use push pull cables, it would be these.
I have them on my boat , smooth and no slop.
https://push-pull.com/marine/


Ever had a frozen throttle or mixture cable? Especially in an airplane intended for higher altitudes and lower temps where condensation during descent is an issue.

Push-pull cables for flight controls are for ultralights, that people other than me are flying.

Those marine cables are 3/8 diameter, they do not resemble throttle or mixture cable which
Are Anout .07 and very whippy.
I am not advocating push pull, in fact if i were going to do it i would use the cables as pull only as on the boat. The pull side is always in tension which pretty much erases free play. And the minimum curve radius is 4” which he should not have to come near.

I am saying if someone is trying push pull the marine cables would be the way to go, they are all stainless steel and permanently lubed.

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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 14:24 
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If i were thinking fly by wire, i would try to figure out how to modify a dual stec 3100 system with his sloppy ass cables as an emergency back up.
At ga tech, we used to say “yesterday i could not spell injiner, now i are one.”


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 15:15 
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Joined: 02/28/17
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Username Protected wrote:
Ever had a frozen throttle or mixture cable? Especially in an airplane intended for higher altitudes and lower temps where condensation during descent is an issue.

Push-pull cables for flight controls are for ultralights, that people other than me are flying.


Cables like these are used on the Velocity. Not sure if Velocity uses Morse, Teleflex or a different brand. But mine work fine and I haven’t heard anyone mention them freezing in cold weather.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 16:46 
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Given Peter's inability to design a proper mechanical aileron control linkage, I strongly suspect that any electrical replacement he comes up with will also be unsatisfactory given that such a system is probably an order of magnitude more complex.



The FBW system should be easy. A couple of linear actuators, a raspberry pi and a Bluetooth connection to the accelerometers on an iPad and you're done. Don't even need the side controls, just the iPad.


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 Post subject: Re: Raptor Aircraft 5 Seat Pressurized 3,600 NM Range Die
PostPosted: 21 Jan 2020, 17:02 
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Here are screen shots from his video of the forward and aft pulley assemblies. It seems that a design change that connected the assembly to additional surfaces, either above or to the side, could provide the additional rigidity required. He doesn't show enough of the interior structure to determine if there are suitable attach points near the existing pulleys but it is clear that mounting to just the single flexible fiberglass surface has not worked well.


Please login or Register for a free account via the link in the red bar above to download files.

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