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post #5682 of Old 01-08-2014 Thread Starter
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Size and speed

Originally Posted by robelz View Post
There is one SF3600 and not a single 10.80 built up to now: How could they register without (really) knowing wether they will have a boat or not?

I did not know the Opium is rated so high...
Yes, they will have a boat and the race will only start in 200 days. I believe that a conditional entry can be made (since they don't now yet the TCC rating of the boat).

From some time now that I wanted to make a post about ratings and boat speed. The images of small boats like the JPK 10.10, Pogo 30 or SF 3200 planning fast downwind give the impression that those boats are faster than bigger performance boats, heavier boats that don't plane so easily and even if that can be true under a very small set of conditions is not true in what regards the overall picture and sail conditions.

Sure, they can have an advantage on a transat with strong trade winds because that's where some of those conditions are more frequent but on a regatta course or in coastal or offshore races with mixed winds the difference in speed is true regarding their rating.

We have seen that the boats I have mentioned on a previous post and that race the transquadra have a IRC TCC rating between 0.949 and 1,051 being the ones with higher rating the new SF 3600 and the new JPK 10.80. The Pogo 10.50 and the Opium 39 would be inside the old max TCC allowed of 1.074 but are now out.

Just to give an idea how size matters I will post some TCC-IRC of several fast 40ft performance cruisers and of some well known racers the size of the SF 3600, the Figaro II, and class 40 just to put things in perspective. Several numbers means that I have found different values regarding different boats.

X40: 1.069... Elan 410: 1.067/1.064/1071.... Grand Soleil 40: 1.063.....J122: 1091/1086/1.084.....XP 38: 1.081/1.086...

Comet 41s: 1.084...... First 40 :1088/1.085/1084.... A40 – 1091/1087/1086..... X41: 1.097.... Ker 39: 1.123/1.136/1.235/1.115...

.MAT12: 1.132 ....Mills 39: 1.100....Pogo 12.50: 1.176 ...King 40 1.120/1.194 ....MC33 patton 1.053...

Class 40: 1.176/1.188/ 1280..... Figaro II: 1.085/1.094/1.080/1.081

Of course, one thing is the rating other the ability of a boat to be sailed to it and in what regards boats like a class 40 or a Pogo 12.50 they will only be able to do it in a race mostly downwind (what explains the normally bad results of these fast boats in IRC racing where mixed conditions are the norm).

Regarding performance cruising it makes sense to have a bigger boat that allows an overall better speed and more interior space, regarding racing and specially in what regards short handed racing or solo it makes sense a smaller boat because you need a crew to exploit a bigger one, with the exception of boats like the Pogo or Opium that can be sailed with a small crew or solo.

Regarding compensated racing with a crew that is a completely different ball game and here size does not count and it makes sense to have a smaller less expensive boat that needs less crew and can have results as good as a bigger one and win races. That's where the A31, A35 and JPK 10.10 are winners, double winners since they are also good boats for solo or short crew sailing as their results on the transaquadra and on the last Fastnet show.

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Last edited by PCP; 01-08-2014 at 10:20 PM.
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