stunthanger.com

Building Tips and technical articles. => 1/2 A building. => Topic started by: Chris Keller on October 21, 2008, 08:29:00 PM

Title: 1/2a apc props
Post by: Chris Keller on October 21, 2008, 08:29:00 PM

Maybe I'm missing something, but all the APC props that are for 1/2a have too big of a hole in them to run on any of the engines that I have. how do you mount a prop with too big a hole?

Title: Re: 1/2a apc props
Post by: minnesotamodeler on October 22, 2008, 04:18:11 AM

Bothersome for sure, otherwise the APCs are good props for 1/2A.  I use a short length of fuel line over the mounting bolt to fill in the oversize hole.  Don't know what engine they designed those things for, I never saw a 1/2A requiring that large a hole.

Title: Re: 1/2a apc props
Post by: ray copeland on October 22, 2008, 08:01:48 AM

I use the Oregon brand yellow fuel line for inside chainsaw tanks, 3/32 x 3/16 size available at Ace Hardware for around 50 cents a foot, fits norvel and ap prop screws well. A little more rigid than silicone hose. Also works well on a syringe for fueling.

Title: Re: 1/2a apc props
Post by: Larry Renger on October 22, 2008, 02:23:32 PM

I think the big hole has something to do with avoiding shrinkage of the hub in the molding process.  Some APC props come with an adapter.  I use several pieces of Aluminum tube inside each other to get the prop centered.

Title: Re: 1/2a apc props
Post by: Ralph Wenzel (d) on October 22, 2008, 03:07:13 PM

Every bag (that I've seen) of APC ½A props has a string of 4 adapters. Talk your friendly LHS out of one. I suppose it's possible that APC would sell a set at a reasonable price just to be sure you use their props . . .

Title: Re: 1/2a apc props
Post by: john e. holliday on October 23, 2008, 08:24:06 AM

Get ahold of Melvin at "MBS Model Supply" about the adapters for the APC props.  I think his son was making metal ones at one time.  Just google "MBS Model Supply".  DOC Holliday

Title: Re: 1/2a apc props
Post by: Chris Keller on October 23, 2008, 08:35:14 PM

I got a few 5.7 x 3 apc props and some fuel line to use as a bushing today. time to test them #^