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Building Tips and technical articles. => 1/2 A building. => Topic started by: Motorman on October 21, 2019, 05:40:36 PM

Title: Tom Morris Lines .008"
Post by: Motorman on October 21, 2019, 05:40:36 PM

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Title: Re: Tom Morris Lines .008"
Post by: Dave Hull on October 21, 2019, 07:06:20 PM

Motors,

Use copper crimp sleeves of proper size. They need to be just big enough to get 3 passes of the wire thru it. Smaller ID is better. I got some appropriate sized sleeves from MBS. Next, stop using the side cutters! Use round jaw pliers. I bought a pair of Craftsman pliers and they work fine for making lines. I like to make three crimps per sleeve with the center crimp formed 90 degrees from the outer two.

I wrapped my first set of .008" lines using 34 gauge (.0063") copper. You can do it, but working with such small lines makes it tedious. I use this same serving wire for all line terminations regardless of size so it's not the diameter of the serving wire that makes it tedious, but the size of the stranded lines. I suppose it would be easier if I used a jig to hold the line, but I don't. Since I got the small sleeves, I have crimped all my .008 lines. No slips and no breaks so far.

I would agree that CyA in crimps is not a confidence building technique.

The Divot

Title: Re: Tom Morris Lines .008"
Post by: 944_Jim on October 21, 2019, 08:21:42 PM

And use eyelets! I cheated on my 24.5" Scientific P-40. I thought, Meh! How much pull can there be?

Second flight I felt something go "Pop," and the plane lunged for the ground!
I barely got enough up into it to fly the tank out. After landing I discovered the neat little loop I put in the up-line pulled out within the sleeve, and stopped pulling once it was cinched down on the line clip. The down-line hasn't pulled out yet, but I had to re-do center based in the up-line now being a 1/2" longer! Those lines will be cut down and remade for smaller models...with eyelets!
I bought my crimping pliars from Hobby Lobby. A nice, pretty, pink round trip needle-nose pliars for only crimping sleeves. Later, same lines, but fresh, with eyelets and copper tubes. Not one pullout, even when slinging my BHM Mosquito around (twin .074 Norvels... not very light).

Title: Re: Tom Morris Lines .008"
Post by: 944_Jim on October 23, 2019, 03:56:14 PM

MM.
.008"x3 (all side-by-side)=.024"
1/16"=.0625"
1/32"=.03125"
I think I used 1/16" id tube on my last lines. I need to check anyway...my tube supply is running low.