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Author Topic: Tether Point  (Read 532 times)

Online Motorman

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Tether Point
« on: May 19, 2020, 05:42:30 PM »
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« Last Edit: August 23, 2021, 10:27:20 AM by Motorman »
Matthew 7:6

Offline Paul Smith

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Re: Tether Point
« Reply #1 on: May 19, 2020, 08:24:00 PM »
Back in the day, rearward leadouts were in vogue.

Later on they moved forward in the interest of speed and smooth flying.

Then came adjustable leadouts.

I think, given the massive power of modern engines, the leadouts can move forward and still have more than enough line pull.
Paul Smith

Offline Reptoid

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Re: Tether Point
« Reply #2 on: May 19, 2020, 09:24:43 PM »
If you're building a Nemesis II, build it per the plans. It was one of the best flying combat designs of the era. Some designs moved the leadouts rearward when lines went to .018". Many of the "Nostalgia designs were designed to fly on .015" lines. When you build one now and intend to fly Nostalgia you want the lead out rake (especially at 75MPH) and a little extra tip weight (.018"=more drag and more weight)
Regards,
       Don
       AMA # 3882

Offline John Given

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Re: Tether Point
« Reply #3 on: May 20, 2020, 05:58:04 PM »
The tip on my VP Nemesis II. Made from Howard’s plan.


Offline Howard Rush

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Re: Tether Point
« Reply #4 on: May 21, 2020, 03:07:40 AM »
Leadout position moved aft 1/2" or so when line diameter changed from .015" to .018".  Here's a drawing.
The Jive Combat Team
Making combat and stunt great again

Offline Tom_Fluker

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Re: Tether Point
« Reply #5 on: May 22, 2020, 07:37:01 AM »
Off topic, but something I have always wanted to know - where did the tail shape come from?

I have one in my study from the 1976 Nationals finals (junior) and got to thinking about that when looking at it.

Offline phil c

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Re: Tether Point
« Reply #6 on: May 22, 2020, 06:02:32 PM »
Off topic, but something I have always wanted to know - where did the tail shape come from?

I have one in my study from the 1976 Nationals finals (junior) and got to thinking about that when looking at it.

I don't know Howard's excuse, but the shape is a highly eccentric ellipse(i.e. not symmetrical).
phil Cartier

Offline Howard Rush

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Re: Tether Point
« Reply #7 on: May 22, 2020, 10:05:17 PM »
It's two half ellipses with the quarter chord a straight line: a ratio of 3:1.  An earlier version had a 2:1 ratio.  I guess I thought the 3:1 was aerodynamically better.  I kinda enjoyed carving them.
The Jive Combat Team
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