Keep it up men! We're all ears.....ugly but helpful.
Ferg
----- Original Message -----
From: "McFadyean" <ami@mcfadyean.freeserve.co.uk>
Subject: RE: Tail[planes
> The "few" is actually the "many"!
> 13 ft.lbs times inertial load factor (3.8g)* = 593 ins.lbs
> Times 1.5* = 889 ins.lbs ultimate>
> Times 1.5* = 1334 ins.lbs ultimate with nominal factor for
non-interference > fit/potential for light hammering.>
> 2no. 1/4" pins bearing on 0.063" wall of 1.5" dia tube generates a
> bearing pressure of 27,587 psi.>
> This should be well within the bearing strength of 4130 N.
> Hence, in my very first contribution to this thread I caveated my response
> that I could not get the tube to fail by means of calculation.
> Nevertheless, they do fail and, as Bob Harrison has pointed out, it is not
> the 4130 tube that fails. Rather, the stainless tube instead. All we need
> to do now is find out what grade it is.>
> (* Ref. Bruhn "The Analysis of Flight Vehicle Structures", JAR-VLA and
> others).>
> Duncan mcFadyean
>
> On Saturday, January 19, 2002 4:30 AM, Fred Fillinger
> [SMTP:fillinger@ameritech.net] wrote:
> Indeed true, and I see where I made it sound like the mass balance has
> > no effect, but I measured it. It takes only about 13 foot-pounds to
> > lift the balance weight. That's about 1/20th of that required to
> > elongate two 1/4" holes in 4130 at least, to the point of noticeable
play, in> > my test. Maybe 13, reflecting inflation, is still a "few?" :-)
> > > Best, > Fred F.
>
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