sorry no-one has answered :-(
NP are saying this sail is good for an 80 kg sailor in 7 to 12 knots!!
are they knots ?
i too am around 100 kilos
my 8.5 does not have cams, but is great around 15 to 20 knots
under that I use a 10.0 TR-4 race type sail - from 10 to 15 knots
the 8.5 can be used under 15 knots, planing starts to suffer for heavyweights
an 8.5 is a GREAT sail for people of our numbers

you can use the james douglass sail calculator for estimates
it states 16 knots for 100 kilos with 8.5

joewindsurfer.blogspot.com

I have found out the hard way today that it the weight of the sailor probably does not matter much.

NP are pretty spot on (12 knots) - even for my 100kg. Around 2.00 - 2.30pm the wind at Lake Illawarra has picked up so much that I could not hold the sail in neutral - probably because of the deep profile.

Thanks for your earlier replies!

joe windsurf said...

winds really picked up - how many knots ??
deep profile - can you apply more outhaul ??

some formula guys less than 100 kilos use 10.0 up to 20 knots !!
that is a bit hairy, butt 100 kilos with an 8.5 is good up to 20 knots as well ...

hope ya enjoyed it :-)

joewindsurfer.blogspot.com

Oh yes, I've enjoyed it very much until I had to switch to "survival mode" to get back to shore. Until the wind got to strong it did it's job very well: It felt very light and got me planing. It felt even lighter then my Excess 9.9 (!) which I have tried after. But by then I was so buggered...

As you've mentioned before, the Helium is a light wind sail (next to no loose leech)and I could not change the Out- or Down haul.