[Rhodes22-list] Trailering With/Without The Mast Crutch?

[Rick Lange]

Are we just talking about the IMF mast?  If so, I've never seen it vibrate
at all.

Regards,

Rick Lange


On Tue, Nov 26, 2019 at 11:36 AM Mary Lou Troy <mtroy at atlanticbb.net> wrote:

> Roger,
> The mast crutch in question is mounted to the stern rail so the distance
> is still roughly 22 ft. This is how GB always transports their boats. I
> think if you were trailering a lot you might want to consider that
> vibration but if you were only trailering short distances, it might not
> matter. Also the masts with in mast furling have additional
> strengthening from the second chamber that keeps the wiring separate
> from the furling tube.
>
> Happy Thanksgiving to all,
> Mary Lou
> ex R22
> now Rosborough RF-246  Tara
> Rock Hall, MD
>
> On 11/26/2019 10:57 AM, ROGER PIHLAJA wrote:
> > Allyn,
> >
> > The mast was not designed to be unsupported for ~22 ft, the distance
> between the bow and stern pulpits.  Think of the mast as a spring.  Left
> unsupported, the mast will vibrate as the trailer goes down the road.  If
> you add in the mast crutch, the unsupported distance is cut by ~1/2.  This
> increases the resonant frequency of the spring outside the range that will
> be encountered on the road.  While the mast will not fail immediately due
> to this over the road vibration, every cycle is adding to total fatigue
> cycles.  The vibration on the trailer is much higher frequency vs when the
> mast is stepped on the water.  This means the fatigue cycles add up pretty
> fast on the trailer.  A 100 miles at expressway speed with the center of
> the mast unsupported probably racks up the fatigue cycle equivalent of
> several years of use on the water.  You are definitely shortening the life
> of your mast if you trailer without the mast crutch supporting the center.
> >
> > Roger Pihlaja
> > S/V Dynamic Equilibrium
> >
> > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
> >
> > From: Peter Nyberg<mailto:peter at sunnybeeches.com>
> > Sent: Monday, November 25, 2019 4:33 PM
> > To: The Rhodes 22 Email List<mailto:rhodes22-list at rhodes22.org>
> > Subject: Re: [Rhodes22-list] Unsure of plastic part above cabin
> >
> > Allyn,
> >
> > Yes, leaving the mast in the crutch during transportation is the norm.
> >
> > —Peter
> >
> >> On Nov 25, 2019, at 4:21 PM, Allyn Baskerville <allynb at adsne.com>
> wrote:
> >>
> >> I did notice cracks around both holes. I agree with Peter that the mast
> crutch wasn't used. When I purchased the boat, the mast was tied to the
> stern and bow rails. I've seen pictures with the mast propped up with the
> mast crutch during transportation, but I'm not sure if this is the norm.
> >>
>
>