Using the data gethered in my post above we can estimate the difference in righting between an Alu and carbon mast, this may be of interest when balancing the pro's and con's.
Additional data is that a pentex mainsail itself will weight 5.5 kg with a centre of effort at about 4.150 mtr up from the mainbeam. With a mast angled downwards (10 degrees) in a capsized position the leverage becomes 4.150 + 0.220 mtr = 4.370 mtr= say 4.50 mtr. This results in an added virtual tipweight of about 4.5/8.5 * 5.5 = 2.911 kg
The 94.5 kg platform (using a 12.5 kg mast on a 107 kg ready to sail boat) is also angled at 10 degrees and thus also provides some additional virtual tip weight of (sin(10)*1.25*0.5*94.5) / 8.5 = 10.256 / 8.5 = 1.207 kg
So the total virtual tip weight of the whole craft on its side is :
Alu mast = 8.25 + 2.911 + 1.207 = 12.618 kg Carbon mast (12.5 kg total) = 5.8 + 2.911 + 1.207 = 9.918 kg
In effect the carbon masted boat takes 9.918/12.618 kg = 79 % = say 80 % of the righting moment that the alu masted F16 does.
And a tipweight lowering of 1 kg results in :
5.00 + 2.911 + 1.207 = 9.118 kg tipweight => 9.118 / 12.618 = 72 % resulting in a 7 % gain in righting ability.
If 100 % equals a 85 kg skipper (me) then 7 % improvement of righting constitutes 5.95 kg less skipper weight needed to right the boat relative to the current tipweight rule.
It is to the class members to evaluate if this is enough of a reason to propose and support a class rules change.
To give some perspective to these calculations. If we assume that it takes at least 85 kg (=me) to right the alu masted F16 in ALL conditions including no wind and perfectly flat water (a very demanding condition) then it requires 67 kg to right the F16 with a carbon mast compliant with the current rules and a 61 kg skipper if we lower the tipweight rule to 5.00 kg.
Many of us have indicated that a little wind makes righting the alu masted F16 significantly easier, probably requiring only 75 kg to right the alu masted F16.
