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23 Jan 2026, 07:56 [ UTC - 5; DST ]


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:22 
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yeah, i completely challenge that, you can watch that right main gear literally bend to failure from the torque/pressure placed on it while the brake struggles to hold the tire against the pavement.....looks like it was locked and they exceeded the load limits of the entire structure- perhaps due to the lack of wings, but that gear is being bent to failure

You are trying to tell us that the gear "bent to failure" during run up on a plane with no wings???? You dont think the plane is light enough here to just slide?
If this "exceeds the load limits", then I can think of at least one engineer that should be looking for a new line of work.....
Seems pretty clear something failed in the retract mechanism. I see absolutely no indication of bending to failure. These are landing gear after all, they are designed to flex.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:29 
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Username Protected wrote:
https://www.youtube.com/watch?v=V-Hw7SWCxF8

2 inch nose wheel.

that runway is entirely too rough to fly anything other than a Super Cub with 30 inch tires.
I cant believe you would fly a retract off of it.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:38 
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Username Protected wrote:
https://www.youtube.com/watch?v=V-Hw7SWCxF8

2 inch nose wheel.

that runway is entirely too rough to fly anything other than a Super Cub with 30 inch tires.
I cant believe you would fly a retract off of it.


Yup, obviously if it's too rough for model jets so you can't fly a Lancair. Or possibly you could conclude that wood screws into balsa wood are stronger than the Lancair gear?

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:46 
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Yup, obviously if it's too rough for model jets so you can't fly a Lancair. Or possibly you could conclude that wood screws into balsa wood are stronger than the Lancair gear?

Yep. I live on a grass strip and listen to this kind of stuff on almost a daily basis. It usually comes from people who 1) are scared of grass, and 2) have very little, if any, experience on grass to begin with.
I, like you, think my grass strip is far more forgiving than asphalt, and just as smooth.
Is it perfect? No.
Would I land a Citation here? Once.
Is it going to cause issues with the landing gear on a single? No.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:51 
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Yup, obviously if it's too rough for model jets so you can't fly a Lancair. Or possibly you could conclude that wood screws into balsa wood are stronger than the Lancair gear?

Yep. I live on a grass strip and listen to this kind of stuff on almost a daily basis. It usually comes from people who 1) are scared of grass, and 2) have very little, if any, experience on grass to begin with.
I, like you, think my grass strip is far more forgiving than asphalt, and just as smooth.
Is it perfect? No.
Would I land a Citation here? Once.
Is it going to cause issues with the landing gear on a single? No.


Got pretty close to landing my jet here but chickened out at the last moment thinking about "what would the insurance company" think. Decided on a low approach instead. I say this jokingly, it's not approved to land an Eclipse on grass.

Grass is great, those that judge it don't have the experience to make a proper opinion.

Last edited on 13 Aug 2016, 12:01, edited 1 time in total.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:53 
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https://m.youtube.com/watch?v=UFCaaJ_1tXc


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:57 
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its going to be interesting to see what the insurance companies think about landing the new PC24 on grass, given it will be approved for it.
I get dinged pretty good on my premiums for basing my 340 here ( even though its yet to spend a night in my hangar). I assume it is the length (2,300') that is the issue more so than the surface.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 18:59 
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Eclipse can do relatively short fields with 1000 to spare too despite what people say:

https://www.youtube.com/watch?v=HAUrjbpi7NI


Last edited on 13 Aug 2016, 12:02, edited 1 time in total.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 20:29 
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Company: Minnesota Flight
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Username Protected wrote:
Yup, obviously if it's too rough for model jets so you can't fly a Lancair. Or possibly you could conclude that wood screws into balsa wood are stronger than the Lancair gear?

Yep. I live on a grass strip and listen to this kind of stuff on almost a daily basis. It usually comes from people who 1) are scared of grass, and 2) have very little, if any, experience on grass to begin with.
I, like you, think my grass strip is far more forgiving than asphalt, and just as smooth.
Is it perfect? No.
Would I land a Citation here? Once.
Is it going to cause issues with the landing gear on a single? No.


This is a thread about the Lancair. How familiar with the landing gear are you? It is no where near as well designed as say a bonanza. Go look at the size of it. Look at how thick the scissors are. Then make those comments. All we are doing is urging some thought on it. BWTHDIK.
Not like I own one or anything.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 20:52 
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Aircraft: 2016 Cirrus SR22 G5
Username Protected wrote:
its going to be interesting to see what the insurance companies think about landing the new PC24 on grass, given it will be approved for it.
I get dinged pretty good on my premiums for basing my 340 here ( even though its yet to spend a night in my hangar). I assume it is the length (2,300') that is the issue more so than the surface.


The key here is 'basing' your aircraft on a grass strip. The base of operation is what the insurers look at when rating the policy. Operations "to/from" unimproved strips or grass strips should not pose any insurance issues at all (even for the PC24) as long as the 'base' is on an adequate length hard surface runway.

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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 21:05 
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The landing gear did not bend to failure. They simply moved in retraction. The locking pins weren't fully seated internally in the main gear hydraulics. Hydraulic pressure holds the main gear down with internal pins as a back up. It is not recommended to tow the aircraft unless the hydraulic accumulator is fully charged. If you understand the geometry of how they work then it makes sense. [youtube]https://youtu.be/gpy5wSf4No4[/youtube]
See how it would appear they bent and folded under the plane, when simply the down lock wasn't pressurized.

See how thin the scissor lock is? Piece that is disconnected behind the strut.


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 21:16 
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Interesting share Todd, I learned something today! The video clearly showed the end of that gear bending like a pretzel though, would the locking pin still provide enough strength for the torque to be applied at the pivot point? What pressure is holding the upper end of the gear allowing the bottom to bend?


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 21:27 
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Rack and pinion.


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 21:36 
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Username Protected wrote:
Interesting share Todd, I learned something today! The video clearly showed the end of that gear bending like a pretzel though, would the locking pin still provide enough strength for the torque to be applied at the pivot point? What pressure is holding the upper end of the gear allowing the bottom to bend?


I must be missing where it bends like a pretzel. Looks like it clearly ended up in its wheel well. The trunion is at an angle so it in and twists like a Cessna. Have you seen the picture of the snapped main gear from Addison though?


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 Post subject: Re: Lancair IV-p
PostPosted: 12 Aug 2016, 22:29 
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Joined: 07/21/08
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Location: Decatur, TX (XA99)
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Username Protected wrote:
Interesting share Todd, I learned something today! The video clearly showed the end of that gear bending like a pretzel though, would the locking pin still provide enough strength for the torque to be applied at the pivot point? What pressure is holding the upper end of the gear allowing the bottom to bend?


I must be missing where it bends like a pretzel. Looks like it clearly ended up in its wheel well. The trunion is at an angle so it in and twists like a Cessna. Have you seen the picture of the snapped main gear from Addison though?

I was there when the gear failed at Addison. The plane is in the hangar with mine and I spent some time studying it. That plane hit very hard. The wings are toast, as is almost everything else. They never found all the blades off the prop....
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