George Lendich wrote:

. One other question I have is. If titanium is not the material to
use what
is ?

                       Respectfully, Tony

Good question. One of the steels obviously. Starting with 4130 heat

treated,

shot peened and rolled threads.  Perhaps 4130 is not optimum. Also
you

want

to make a distinction between a bolt and a stud. A bolt has exposed

threads

unlike a properly installed stud. Makes a difference if you are
putting
a bending load on the stud or bolt. The bending loads come from the
long
bolt vibrating in the over size housing bores.

Paul Lamar

Paul,
I guess I will have to look at this for my single rotor, so this
discussion
is timely for me.
So I would be happy if someone told me what the current bolts are
made of,
and what characteristics I have to look for.

Perhaps 4340 might be a good material,s it is extremely tough.
George ( down under)

Hi Paul and George, Because the bolts {studs} are roughly half the
length for a single rotor, the vibration frequency will away above
that found in the twin, so I doubt it will be of any consequence.
Also, the single  has a bearing on each side of the rotor, the whole
engine is much more rigid and much less inclined to twist {squirm}.
FWIW, Dave McC

 
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