WY kitfox Yamaha build

115 posts in this topic

Posted

Your build is truly inspiring. I have been plugging away on my scrappy build, but I must admit, I think you will have a show horse when she is done!

Thanks for the compliments!  Build threads and flying videos keep me motivated, that’s one of the reasons I’ve been documenting my build here. 

 

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Posted

nice progress. Thanks for sharing!

Would you like to share some more info regarding your landing gear, like width and especially tube dimensions front and rear legs...

most of the tubing is .049, 1 1/4 inch for the front leg and 1 inch on the rear.  The legs are about 33 inches long and center to center on the tires is about 82 inches. Keep in mind this is hillbilly engineered...

Curious. I am building a gear myself. Where is the 33" measured from?

front gear leg mounting point to the axle mount.

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Posted

Foot wellFBAFF60C-85BA-442F-8829-7CD3270602CB.thu680A2225-A4E8-423D-AEA2-BC67FF3712DE.thu680A2225-A4E8-423D-AEA2-BC67FF3712DE.thuI’ll do my best to update my build but for some reason I can only add about half my photos without getting some sort of error.1DCB91C1-EF8E-430F-AB2E-2999E3EEE53C.thuFirst try at covering.

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I like the firewall a lot.  Is it 0.016 301 SS? Did you weight it?

I like how you put use the fabric to move the air around the cabane. What is the vertical distance your cabane bracket (where the tension rods mount) hangs from your floor? It looks like many used 7-8 inches. It looks like 6" might be the closest one could get without too much tension on the longerons.

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Posted

Between 6”-7”. I built a truss that was basically the width of the fuse and about 6” tall and welded it to the bottom of the seat truss structure.

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Posted

Between 6”-7”. I built a truss that was basically the width of the fuse and about 6” tall and welded it to the bottom of the seat truss structure.

I am working on something similar. If you have any pictures of the truss, that would be great. Also, I am currently researching the geometry of the intersection points of the front landing gear tube and the strut tube (this intersection is an imaginary line drawn that intersects the 2 lines) to assure there are no buckling forces to the front tube under a hard landing. The geometry is important there. I will be happy to share my findings with you. If you have any drawings of your gear, I can check your gear for that as well.

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Posted

This is the best I can do on the photos.

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Posted (edited)

3/4 .049 tube is what I used for the cabane truss. I didn’t “engineer” my landing gear but I did find a link on this site  to an old article that gave some guidance on designing a cabane style gear, it explained how moving  mounting points and angles varied the loads through the fuselage, I used what I learned in that article to design my gear. I haven’t seen any pictures of how the kitfox fuselage fails on a hard landing when equipped with a cabane gear but I suspect the lower longerons at the front mounting point will be pushed in towards each other.

Edited by 72chevy
Clarification

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Posted

Good stuff! You are a pioneer with a super cool bird!!

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Posted

Been working on the firewall forward and it’s basically done now. With everything completed I will need to get the engine back on my test stand and verify the exhaust, intake and fuel system I came up with perform correctly.

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Posted

For whatever reason the above photos didn’t go up in any particular order, oh well, I’m sure everyone can figure out what’s going on.

I guess the time flies, this is where I was at this time last year.

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Posted

You sure do beautiful work.  I hope to get down there this spring and see it in person.

Im in the process of installing EFI on my 912ULS.  Should be ready to fire it up this weekend.  

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Posted

I'll second what Paul says,  real nice work!  JImChuk

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Posted

I will second (second) that. Awesome work! A future show winner.

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Posted


That's some really nice work. Great welding. Neil

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Posted

You have my vote on that for sure!

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