stunthanger.com

Building Tips and technical articles. => 1/2 A building. => Topic started by: Dane Martin on July 07, 2020, 05:41:43 PM

Title: Jim Walker .065
Post by: Dane Martin on July 07, 2020, 05:41:43 PM

I'm not 100 percent certain on the displacement. I've seen a few on Ebay, so I know they're not super rare. But, what's the history?  Did they come on some of the ready to fly planes? Is there a way to date this engine?

I got a sweet deal on a small 1/2a lot. I got a couple royal spitfires, this Jim Walker engine and some others.

Title: Re: Jim Walker .065
Post by: Dane Martin on July 07, 2020, 05:42:19 PM

The royal spitfires

Title: Re: Jim Walker .065
Post by: dennis lipsett on July 07, 2020, 06:32:20 PM

My memory is a little short but I believe that it was made by Mel Anderson and  It was the largest of the small compact engines of the day that he made. He also made a special version for Jim Walker, it had a bulb controller that when you squeezed it it closed a clapper on the venturi and gave you a crude form of throttle control. We had fun doing touch and goes with one of them. It might have been 1955 or there about. As I said my memory is getting shaky.

Title: Re: Jim Walker .065
Post by: James Holford on July 07, 2020, 08:39:48 PM

Yea I know the deal you got great score!

Sent from my SM-G965U using Tapatalk

Title: Re: Jim Walker .065
Post by: Dan McEntee on July 08, 2020, 07:13:51 AM

     Notice the resemblance of the Walker engine to the Royal Spitfire! I think I have at least one of these myself.
   Type at you later.
     Dan McEntee

Title: Re: Jim Walker .065
Post by: Dane Martin on July 08, 2020, 08:26:18 AM

Very cool Dennis.  I think you're at least close, if not on the money.

So, probably more work than it's worth.... but this one has a broken lug, and missing backplate. What I've done in the past, was to TIG weld it back up and mill it out.

It's a threaded back plate. I can cut as fine as 120tpi. So that should be an "easy" task.

Title: Re: Jim Walker .065
Post by: dennis lipsett on July 08, 2020, 11:47:32 AM

Quote from: Dane Martin on July 08, 2020, 08:26:18 AM

Very cool Dennis.  I think you're at least close, if not on the money.

So, probably more work than it's worth.... but this one has a broken lug, and missing backplate. What I've done in the past, was to TIG weld it back up and mill it out.

It's a threaded back plate. I can cut as fine as 120tpi. So that should be an "easy" task.

Dane,
Hope that your restoration goes well. But remember that when you run it don't be surprised when it is only about average power. He was making engines to appeal to a specific group, mainly energetic young people who wanted a fun model to fly. It really was a different generation.

Dennis

Title: Re: Jim Walker .065
Post by: Dane Martin on July 08, 2020, 12:47:11 PM

Quote from: dennis lipsett on July 08, 2020, 11:47:32 AM

Dane,
Hope that your restoration goes well. But remember that when you run it don't be surprised when it is only about average power. He was making engines to appeal to a specific group, mainly energetic young people who wanted a fun model to fly. It really was a different generation.

Dennis

Thank you Dennis. With that, it'll probably just end up on a light free flight sport model. Really more of something to be able to hear it run. Sit back and admire it. They don't seem rare, so I could probably just Ebay one. But I think I like making parts and running these things more than anything right now

Title: Re: Jim Walker .065
Post by: Chris Sarnowski on July 08, 2020, 04:24:17 PM

Check the piston-conrod ball joint play before you run it. I have one that is pretty sloppy. Does not look like it can be reset easily like a Cox piston ball joint.

-Chris

Title: Re: Jim Walker .065
Post by: Controlliner on December 09, 2021, 07:49:14 PM

.065. the piston is three piece piston snap ring and ball cup (socket)

Title: Re: Jim Walker .065
Post by: Fredvon4 on December 10, 2021, 05:01:03 AM

Would this have been used on one of these?

https://www.rcgroups.com/forums/showthread.php?4027561-Jim-walker-firebaby-arf

currently for sale.....not mine