do NOT know the Atom - from what i found it is only 99 litres ??
and for light winds they speak of it handling 9m sails ??
what is your definition of light wind
with a bum knee, will you only do waterstarts or ??
the difference between 7-oh and 7.5 is minimal
based on james douglass' sail calculator there is a difference of one knot
7.5 should be good to go around 15 knots for your weight
if you are in steady solid winds - even less wind is required
i use an MS-2 8-oh cammed sail in winds 20 to 40 kph on a 160 liter 79 cm board
under that i use a CAT longboard with the same sail
i weigh a bit more than you though - 100 kilos ...
sounds to me you may need more sail than 7.5 if Atom is a sinker !!
btw the MS Pursuit is okay with constant curve or hard top masts ONLY - no NP !!
lotsa luck !!
joe windsurfer @ 100 kg
2006 AHD type-F FF 160/79cm, 2002 BIC Techno Formula + 2000 Fanatic BEE 124 LTD
Gaastra Flow 3x 7.0, MS MS-2 8.0, TR4 10.0
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Last edited by joe_windsurfer; 11th December 2011 at 08:54 PM.