34
|
Page
Copyright © 2014 by Corsair Marine International
The high potential speeds possible with rotating masts off the wind can be intimidating
to new multihull sailors, and, if necessary, the potential speed can be reduced to a more
comfortable level by reducing sail or by under rotating the mast, which depowers the
mainsail. More rotation can be used as one becomes comfortable with the speeds
possible.
When spinnaker running before very large seas offshore, with boat speeds of 20 knots
or more, there can be a danger of pitch poling. This can be caused by pressure from the
mainsail which cannot be caused downwind should the bow dig in. The
solution is to
drop the mainsail,
which virtually eliminates this risk. This rule only applies to racers, as
cruisers should have reduced sail well before this even becomes a danger.
The limit for racers with modern rigs will always be nose diving, though this is hard to do
with a Corsair design, due to their characteristic ‘high bow’ sailing stance. The C28, for
instance, at speed, frequently has the complete center hull bow section out of the
water, the waterline beginning just in front of the daggerboard. This comes from the
wide flat swept up aft sections of the main hull which generate negative lift, actually
sucking the stern down.
This characteristic can be maximized when needed with high speed racing downwind, by
moving the crew inboard and aft to the back of the cockpit. This keeps the flat aft
sections of the center hull in the water and the bows very high, by increasing the
negative lift at the hull aft sections. This works most effective on aft cockpit rotating
mast boats, where the heeling component of the sails is less than the fixed mast, that
being angled more forward.
Also important for the best performance, by minimizing wetted surface area, is to move
crew weight well forward in light to moderate winds, to keeps the bows down,
countering the stern negative lift.
The boat should also be heeled to leeward (crew on leeward side) when sailing to
windward in light winds, just as with a mono. This keeps the sails in a more efficient
shape.
ANCHORING
Trimarans tend to be lively at anchor, due to their light weight and shallow draft. They
like to sail from side to side, which can be annoying. This is simple to overcome by using
a bridle setup to each float bow. These have eyes fitted as standard, for a block to lead
the bridle lines aft.
When anchoring, just lay out your anchor as normal, over the main hull bow roller. Set
up the rope bridles, running through the blocks on the float bows and back to the
spinnaker coaming winches. Bring the 2 bridle lines together in the center of the boat
and attach to the anchor line. Let the line out further until the take over the load. You
will then have a well behaved boat.
Summary of Contents for 28R
Page 1: ...SAILING MANUAL For Corsair Trimarans ...
Page 2: ......
Page 57: ...55 Page Copyright 2014 by Corsair Marine International CORSAIR SAIL PLANS C24 MKII sail plan ...
Page 58: ...56 Page Copyright 2014 by Corsair Marine International Sprint 750 MKII sail plan ...
Page 59: ...57 Page Copyright 2014 by Corsair Marine International Dash 750 MKII sail plan ...
Page 60: ...58 Page Copyright 2014 by Corsair Marine International C28 RS C28 CR C28 CE sail plan ...
Page 61: ...59 Page Copyright 2014 by Corsair Marine International C31RS C31 CR C31 UC sail plan ...
Page 62: ...60 Page Copyright 2014 by Corsair Marine International Cruze 970 sail plan ...
Page 63: ...61 Page Copyright 2014 by Corsair Marine International C37 CR RS sail plan ...
Page 69: ...67 Page Copyright 2014 by Corsair Marine International C37 CR RS accommodation plan ...
Page 94: ...92 Page Copyright 2014 by Corsair Marine International TYPICAL TRAILER SETUP ...