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« on: June 13, 2012, 11:47:55 AM »
I had it, the mast was pumping in the midsection.
My conclusion was that the mast was under too much compression. could be wrong about the cause.
I fix the problem and have never had the pumping since.
Start off by removing the boom
Loosen uppers, lowers and backstay
position the mast in the center of the mast partner. if you have the mast collar install it
secure the mast in the mast partner with pine wedges, I use about 8 on them
tighten both lowers on each side a little then switch sides. Tighten to Loos setting listed below
open hatch in main salon and eye up the mast track for any bends
Tighten uppers a little on one side then the other. Ditto on the settings
If you tighten one side too much, a bend at the top is visible
tighten backstay. should see a nice bend aft
I have a roller furlng on headstay that can not be adjusted
I you have an adjustable headstay back it off so that the mast has a bend aft
BTW I had a friend that had a P323 he tightened the backstay so much he could not open the cockpit lockers
Go for a sail, adjust, then pin the turnbuckles
I yank my mast every season, and it never pumps even high winds
The Loos I have is the one that you attach to shrouds then pull a string loop to read the numbers. The cheapest model.
If you have my Loos. try 38.5 to 39 on lowers and I think 42 to 45 on uppers and backstay.
These numbers worked for me
Good Luck
BobG