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Old October 17th 17, 04:26 PM posted to rec.aviation.soaring
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Default Is there a nose hook modification for a standard cirrus

On Tuesday, October 17, 2017 at 10:13:50 AM UTC-4, wrote:
On Monday, October 16, 2017 at 8:29:08 PM UTC-5, Andreas Maurer wrote:
On Mon, 16 Oct 2017 01:17:26 -0700 (PDT), krasw
wrote:


Statistical data would be like "we have a group of Std.Cirrus gliders with nosehook and similar group with C/G hook, and we can say that this group exhibits XX accidents during tow per 100000 hrs, and other group YY accidents per 100000 hrs". Or something to that effect.


100% agree.

For 25 years my club has had two DG-300: One with nose hook and one
without. We had exactly one incidence where a DG-300 got the tow plane
out of control by pulling up its tail.

It was the one with the nose hook.


Andreas, pre Newtonian physics (Galileo) suggest that the nose hook is providing more stability, no non-stochastic statistics necessary to prove that! Why is it so hard to accept that you're better off with the tow line attached to a point far forward of the cg? Anecdotal stories are BS.


"True" nose hook is higher and more in line with the center of mass, thus reducing the pitching force when rope tension is really high. This helps with kiting to a degree. It is possible to yank hard enough that this pitching force can exceed the ability of the horizontal tail to overcome, especially at high weight and aft CG. Dick Johnson did an article about this in late '86 or early '87.
Also provides some straightening effect in yaw obviously.
FWIW
UH