Originally Posted by schoonerdog
Oh, BTW, the prout 45 I saw with a rotating mast was an aerorig. Free standing, rotating mast, so no shrouds. Amazingly easy to use, great performance, astronomical price
The Carbospars aerorigs were not cheap
, or light. We have built a number of these (called them Easyrigs) and they were considerably cheaper and lighter. If you design the boat around the rig, and allow for maintenance
and replacement on a stayed alloy rig, the easyrig will almost certainly work out cheaper.
Other advantages are:
lightly loaded sheet can be dumped to completely depower the rig and stop the boat in any conditions, on any point of sail.
Because the rig is unstayed, it flexes in gusts, hugely increasing the safety
factor and reducing the need to reef.
The headsail is clear of the deck
, allowing visibility forward and to leeward.
can be hoisted, reefed and lowered on any point of sail, any wind speed. Bat cars and rcb track are not required.
Gybing is far easier (pull in then release the lightly loaded sheet), far safer (no traveller, no boom crashing across, no stays to stop the boom) and in really bad conditions you can granny the rig all the way round the front of the boat.
There is much less maintenance
, and what there is is at deck level. If anything does break, the mast won't fall down.
Running square, you ease the boom to 90 degrees or more, the jib
poles out to windward automatically.
Reaching, the jib
does not need barberhauling
Apart from local reinforcing of the deck and mast step, the layout of a cat is not compromised with local strengthening for chainplates, fore beams, strikers, travellers, mast bulkheads and sheet winches. Not having all these is also a considerable weight saving.
If a round mast is used, there may be more windage, depending on what rig configuration is chosen. If a wing section is used, the drag is way less.
The jib cannot easily be backed during a tack.
Forestay tension can be hard to get, which affects the jib for heavy air upwind and racing
. Easy enough to put runners from the hounds to the end of the boom if required for these situations.
It has been generally accepted that multis are too stiff for unstayed rigs. Team Phillips, Jimmy (60' Irens cat), the 35' cat in the attachment and the 50 footer in this video
prove that this is not the case. It is possible to engineer
and build an unstayed mast to suit the righting moment and desired use of any boat.