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The Gennaker should be either a headsail or a spinnaker (ERS G.1.3) If it is a headsail, I don't see any restriction to the butterfly. Furthermore, the RRS mentions about the sheeting of sails in section 55.3 "(a) a headsail clew may be connected (as defined in The Equipment Rules of Sailing) to a whisker pole, provided that a spinnaker is not set". I don't see any restriction on the side for this whisker pole in the ERS (please correct me if i am wrong), so it could on the opposite side of the boom which then would be a "practical" way to operate the butterfly configuration. If it is a spinnaker, the answer should be in the Class Rules (as mentioned by Greg Eaton already) e.g. ORC rating systems 209.4 "Spinnakers shall be sheeted on the same side as the boom, except when gybing or manoeuvring."
I think this is only restricted by class rules or if the SI were to restrict it. An example of a class rule restriction is below from the Melges 15 class.
C.11 Boat Handling C.11.1 Wing on Wing Sailing (i) A boat shall not sail with the spinnaker filled opposite the mainsail (commonly known as wing-on-wing) for a distance of 2 or more of her hull lengths. A boat may take a Two-Turns Penalty as described in RRS 44.2 when she may have broken this rule while racing. However, when despite taking a penalty, the boat gained a significant advantage in the race or series by her breach her penalty shall be to retire.
Wing-on-wing sailing (as we call it here in the US) is common in some classes (where it's not prohibited by the class rules or SIs), to the point where sailmakers invest in producing videos on how to execute the technique. Here's one example from North Sails:
Getting a little in the weeds here, but for some reason I thought that it was OK to have shoulders outside as long as hips were inside. That's not really how the rule reads, but I thought it was how it was interpreted maybe? Thank you.
Doesn’t it depend upon the number of lifelines?. If you have double LL’s, a crew can sit facing out and fold over the lower LL and use an outstretched appendage to hold a sheet out.
49.2 “[…] On boats equipped with upper and lower lifelines, a competitor sitting facing outboard with his waist inside the lower lifeline may have the upper part of his body outside the upper lifeline”
And …
Case 4: “[…] No part of a person’s body is a ‘device’. It is therefore permissible for a competitor to hold a sheet outboard ..”
Doesn’t it depend upon the number of lifelines?. If you have double LL’s, a crew can sit facing out and fold over the lower LL and use an outstretched appendage to hold a sheet out.
Quite right, but it would be a pretty strange sheet lead.
Alberico, on Sunday I had to do exactly what you asked about here. We lost our spin-halyard (luckily for only the last leg of the last race of the J105 regatta) in 20g30kts and finished the last downwind leg of the regatta "butterfly" (we call it "wing-on-wing").
My bowman laid with his back on the deck (butt at the toe rail and full torso inside the life lines) with both his legs outstretched and his feet stabilizing the clew of the winged jib. Given the forces in those winds, he needed the extra strength available in his legs.
We actually only lost 1 boat in that last leg. :-)
If it is a headsail, I don't see any restriction to the butterfly. Furthermore, the RRS mentions about the sheeting of sails in section 55.3 "(a) a headsail clew may be connected (as defined in The Equipment Rules of Sailing) to a whisker pole, provided that a spinnaker is not set". I don't see any restriction on the side for this whisker pole in the ERS (please correct me if i am wrong), so it could on the opposite side of the boom which then would be a "practical" way to operate the butterfly configuration.
If it is a spinnaker, the answer should be in the Class Rules (as mentioned by Greg Eaton already) e.g. ORC rating systems 209.4 "Spinnakers shall be sheeted on the same side as the boom, except when gybing or manoeuvring."
https://www.youtube.com/watch?v=X5BIpAMA-ak
but you must not use a 'human whisker pole' that contravenes RRS 49,
Position 5 and 6 break RRS 49.2
P 4 breaks RRS 49.2 rule on boats with a single lifeline.
P 1, 2, 3 are OK
Thank you.
Torso is the main part of your body, and does not include the head, arms , and legs
An arm is not a torso.
A shoulder is debatable.
A shoulder and hip together are part of a torso.
See diagrams 1 and 4 in Case 36
In your diagram there's clearly a substantial part of torso outside. That breaks the rule.
And …
Case 4: “[…] No part of a person’s body is a ‘device’. It is therefore permissible for a competitor to hold a sheet outboard ..”
Quite right, but it would be a pretty strange sheet lead.
My bowman laid with his back on the deck (butt at the toe rail and full torso inside the life lines) with both his legs outstretched and his feet stabilizing the clew of the winged jib. Given the forces in those winds, he needed the extra strength available in his legs.
We actually only lost 1 boat in that last leg. :-)
Ang