Mast Pumping 1988 Catalina 36 MKI

[jssailem]

Care Preston. Running out in a blow ("We had it close hauled in 20 gusts to 25 last weekend") with a rig that needs to be tuned for issues like "MAST PUMPING" can lead to unexpected results.

Might consider taking it a little easy till you get the rig tuned.

Then go out and have at it.

Just saying.

 

[Mark Maulden]

When the rig starts shaking and making noise, it's time to wake up and check the anchor...

 

[Prestonrockstar]

I don't think anyone sleeps in 20 knots + while anchored.

 

[Prestonrockstar]

Care Preston. Running out in a blow ("We had it close hauled in 20 gusts to 25 last weekend") with a rig that needs to be tuned for issues like "MAST PUMPING" can lead to unexpected results.

Might consider taking it a little easy till you get the rig tuned.

Then go out and have at it.

Just saying.

Exactly. I just didn't know it was out of tune. Seems obvious in hind sight. Rigger coming out to do it up right.

 

[jssailem]

Good idea.
When you get the rig aligned and tuned, if you still have an issue, check the back stay. I put up a radar reflector on our back stay. Great for radar reflection, but a liability in a very stiff breeze while anchored or in the marina. As the 30+ breeze blows through the rigging the radar reflector likes to snatch a bit of it and act like a drunken sailor wagging about. This transfers to the mast and the mast conveniently shares the pumping, throbbing message down to me while I am trying to rest.

With the mast properly tuned, pulling up the slack by tightening the back stay has helped.

Good luck.

 

[quadrille38]

I found on my previous boat a Catalina34 that if I sheeted in the main sheet too tightly the mast would pump. Loosen it a bit and the pumping would stop

 

[Parsons]

I don't think anyone sleeps in 20 knots + while anchored.

You need better ground tackle! I've slept many a breezy night about fifty yards behind my Rocna set well in sand or mud. In the lea of an island, there's no fetch and therefore minimal waves.