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Speed,Combat,Scale,Racing => Combat => Topic started by: Motorman on May 19, 2020, 05:42:30 PM

Title: Tether Point
Post by: Motorman on May 19, 2020, 05:42:30 PM

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Title: Re: Tether Point
Post by: Paul Smith 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.

Title: Re: Tether Point
Post by: Reptoid 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)

Title: Re: Tether Point
Post by: John Given on May 20, 2020, 05:58:04 PM

The tip on my VP Nemesis II. Made from Howard’s plan.

Title: Re: Tether Point
Post by: Howard Rush 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.

Title: Re: Tether Point
Post by: Tom_Fluker 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.

Title: Re: Tether Point
Post by: phil c on May 22, 2020, 06:02:32 PM

Quote from: Tom_Fluker 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.

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

Title: Re: Tether Point
Post by: Howard Rush 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.