I have to replace the firewall and nose gear on my 601HD. The 601XL seems to have a "beefier" nose wheel gear support. Anyone ever done a swap?

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I'm Just finishing the conversion on my 601hd. I scratch built the 650 nose gear assembly and stiffeners.  Also decided to install the Viking steel bungee.  Jim Olson sent me his plans for the spring gear mains conversion, now I have zero bungees on my plane.  No problems and it seems to be so much more robust in every way. 

Here's a couple of photos,  shows before and after.  Mine was a conventional gear now being converted to Tricycle. 


Charles, thanks so much! How do I get Jim Olson's plans for the conversion??

Charles, many thanks! How do I get Jim Olson's plans?

I've got the file here on my computer I'll send you a copy.

Many thanks!

I sent a friend request, I'll attach the files to a message. There's quite a bit of info, pics and measurements. I modified from his plan slightly but will send the file as I received it.

Thanks again!

here are the PDF's I have a bunch of photo's for the install as well.


Thanks again!

I have a 601 HD and the 650 firewall is a direct replacement from what zenith has informed me. Plan on upgrading mine in the near future.

Looks like I will probably go that way also.


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