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3 Tube main landing gear
http://thorp18.com/thorpforum/viewtopic.php?f=7&t=8370
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Author:  SAT18 [ Fri May 17, 2019 5:45 am ]
Post subject:  3 Tube main landing gear

Hi,

On my current project that I purchased, I noticed the landing gear differs to the original plans. It is made of 3 tubes on the gear legs (1"x0.188, 1.25"x0.120" and 1.5"x0.120") All other dimensions are per dwg-515 (Long landing gear.)

The 1" tube runs the full length of the main gear from top attach point to axle mount, with the 1.25" tubing fitting over this and it being about 2" short on both the top and bottom. It is welded to the 1" tube. The 1.5" tube is as per Dwg 515. Heat treating done as per the plans.

This landing gear has not flow yet, it was locally manufactured to replace a damaged LG. Has anyone seen this kind of design on a T18 A-frame? Trying to determine if it is worth using.

Dan.

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Author:  James Grahn [ Fri May 17, 2019 9:25 am ]
Post subject:  Re: 3 Tube main landing gear

Not in my 21 years of flying these have I seen that type of gear.
Cubes

Author:  leewwalton [ Sat May 18, 2019 10:55 am ]
Post subject:  Re: 3 Tube main landing gear

Looks way overbuilt to me .. gear is heavy enough as is. That one looks 50% heavier!

Author:  James Grahn [ Mon May 20, 2019 7:01 pm ]
Post subject:  Re: 3 Tube main landing gear

If you use that gear, I recommend that you frequently inspect the 1” tube area by the axles. That cannot be as strong as 1.25 by .313 wall.
Cubes

Author:  fytrplt [ Mon May 20, 2019 7:21 pm ]
Post subject:  Re: 3 Tube main landing gear

it is also welded down there where it needs to flex.

Author:  dickwolff [ Wed May 22, 2019 7:21 am ]
Post subject:  Re: 3 Tube main landing gear

Dan...

The plans-designed gear is already plenty stiff. What you have there is going to be worse. You really don’t want that.

D

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