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Landing gear struts without scissor links

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cpatelaero

New Member
Joined
Apr 13, 2020
Messages
4
Hello,

I am working on a tube-in-tube (Tony Bingelis/AR-5/CA-65) landing gear strut for a custom homebuilt that is a mash-up between a KR2 and a Gazaile II, with EZ-like construction methods. 1125 lb gross, Rotax 912iS. I'm considering designs that do not have a scissor link. Would greatly appreciate inputs from anyone who has firsthand experience with the following designs:

- Parker Teeny Two: Has a simple implementation with a spring and concentric rubber hoses. Torsional constraint is provided by a ~quarter inch bolt riding on a slot in one of the tubes. The contact stresses do come out to be high for a heavier airplane. Did the Teeny Two have any problems with the bolt-in-slot arrangement, esp. with wear/plastic deformation?

- Tipsy Junior: Seems like a square tube inside a circular one. Not sure if something like Phenolic/Delrin or wood is used as the spacer, but there seems to be a reasonable bearing area. Any experience with this design?

- Jodels: Some of them seem to have streamline struts with no scissor links, but I don't have any further info. Did they work well?

I will be able to do the structural sizing, so just need inputs on how the designs worked in general.

Thank you!
 
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