Plan B

International One Metre Racing Yacht

SHOWCASING - PLAN B - A HIGH PERFORMANCE IOM RACING YACHT FOR COMPETITIVE RC SAILING

RIGS

The rigs are supplied ready to have sails fitted.

All three rigs use 11 mm diameter x 0.6 mm wall black, high-tensile aluminium mast sections and your choice of either 11 mm diameter x 0.6 mm wall black, or rectangular Sailsetc black boom sections.  The rectangular booms sit a little higher, but enable infinite rather than stepped sail adjustments.  

The #1 rig mast has 12 mm forward pre-bend rolled evenly from the head to 900 below and the #2 rig mast has 8 mm forward pre-bend rolled evenly from the head to 600 below.  The #3 rig mast is without spreaders or forward pre-bend.  With all three rigs, I tighten the back-stay to initially give very little mast aft bend, progressing to more at top-of-rig wind strength.  #1 and #2 rigs use the forward shroud positions at the deck.  The steeply raked #3 rig uses the aft shroud positions at all times.

Spreaders of the #1 and #2 rigs are bespoke from 3 mm diameter aluminium.

The #1 jackstay-variant mainsail is cut to suit a straight mast and will accept only very little aft bend adjustment.

Shroud heights, jib-boom pivots, mast pre-bend and mast rake are combined to give a rig that will automatically adjust to wind gusts, freeing and flattening both jib and mainsail in harmony.  This allows the correctly trimmed yacht to sail close-hauled to windward, in balance, needing only minimal helm correction.  

The mast has a plain, cylindrical plastics step.  In the hull, the mast-step base is flat and parallel to the waterline.  This allows the mast step  angle to be tuned to the rake used, helping to keep the lower mast in column. 

#2 and #3 rigs have internal mast corrector weights, to bring them to a nominal #1 rig weight.

Fittings are a selection of Sailsetc commercial and Plan B bespoke.  

 

A PERFORMANCE IOM DESIGNED AND BUILT IN AUSTRALIA BY PETER BURFORD
"Everyone needs a Plan B"