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Author Topic: What size keadouts for a 5' built-up model with .35-.45 size engine?  (Read 1244 times)

Offline 944_Jim

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OK, Gents!
Subject says it all. The model of subject right now is a UKIE with Fox .35. Another model is smaller at 34" with a Cox Medallion .15.

So I hope to buy one 50 foot spool of 7-strand to cover lead-outs for both models.

I fly .049-.074, so this is uncharted territory for me.

Thanks for any and all answers in advance!.


Offline Dan McEntee

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Re: What size keadouts for a 5' built-up model with .35-.45 size engine?
« Reply #1 on: September 03, 2020, 08:54:57 PM »
  I have an oddball set of .027" lines that I figured I would never use to fly anything, so I have been using that for lead outs. If you use the method of putting lead out wire through thin copper tubing, then bending to a tear drop shape to put through your bell cranks as a method of bushing the bell crank, this will fit through 1/6" copper tubing also. Plenty strong for almost any stunt model.
  Type at you later,
  Dan McEntee
AMA 28784
EAA  1038824
AMA 480405 (American Motorcyclist Association)

Offline Ken Culbertson

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Re: What size keadouts for a 5' built-up model with .35-.45 size engine?
« Reply #2 on: September 03, 2020, 10:15:25 PM »
Technically, anything that is stronger than your lines which usually means a larger diameter.  If your lines break on a pull test you want them to do it outside the wing.  If they break in flight, it won't matter.  Just don't use something so small that it can wear out at the bellcrank.

Ken
AMA 15382
If it is not broke you are not trying hard enough.
USAF 1968-1974 TAC

Offline 944_Jim

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Re: What size keadouts for a 5' built-up model with .35-.45 size engine?
« Reply #3 on: September 04, 2020, 04:05:20 PM »
Dan,
ISTR .027 being the magic number. Now I feel better (I couldn't trust the oxygen-powered carbon-based computer under my hair).

Ken,
I thought that too, but I wanted to be pretty close to legal/appropriate.

I think I have some .018, so that will be employed by my BHM Challenger. I'll also keep my eye open for an old spool of .027 for the UKIE.

Thanks much, guys.


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