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CoreAS said..2:42 on the video windsurfer and myself windfoiling.
Wind was 15 mph, we are both having fun so everyone has choices!
a) 8.5, board and fin
b) 5.0, board and foil
The main difference its difficult to do 100% planning gybes or duck gybes on a 8.5

When windsurfing in lighter winds there is always the schlog factor, carrying big/heavy sails, sail drag etc but with wind foil you are always moving and having fun, the sensation of going off the wind on a foil equals doing coke, JimS

Yeah but that windsurf board looks a older longer narrower board. An 8.5m Cheetah would be more suited to a 80-85cm wide board for light winds. I use an old board (2003) with my Ezzy Lion 8.5m, just 125l, but its 80cm wide, 235cm long and has a wide 57.3cm tail ofo.
You are using the latest Slingshot foil which you said you have had 23mph out of, the older Hover did just 20 mph. Both are slow. They arent fast foils.
I can plane out of gybes in 15mph winds. I dont duck gybe anything.
I wouldnt fancy launching in a shorebreak with a foil. Or sail in shallow water. Hit the bottom and you could break the nuts/mountings in the fuselage and then thats trouble. Cross thread a fin bolt and you can replace it cheaply. Low tide in Poole Harbour I'll be using my fin board.
This thread seems to have turned into a discussion about which is the best. I'm going to use foils to compliment my fin boards. I've posted 55 session on the GPS site with my 8.5m. Slowest is 19.9 knots for the 10 second average. Fastest 24.77. On my foil kit, I'll be happy if I reach 22. Top speed isnt my main aim but dont want to chug around, its making the best out of the conditions.
If you want to compare speeds:
Poole Harbour in a choppy southerly 15 knots average wind gusting 20. Not quick speeds as it wasnt much good for that as it as so choppy.
Today was the first time I have seen all 3 sail at the same time on different kit.
Garry on the foil, been doing it nearly 3 years and still improving. He is usually is quicker than the other 2 on a fin, by about 1 knot.
Bob & Danny have switched to proper slalom kit in the last 2 years and both improving.
Garry 24.56 knots 10s average.
www.gps-foilsurfing.com/default.aspx?mnu=user&val=366151&uid=18265&spotid=598Bob 26.55 knots 10s average.
www.gps-speedsurfing.com/?mnu=user&val=366141&uid=24325&spotid=598Danny 26.36 knots 10s average.
www.gps-speedsurfing.com/?mnu=user&val=366146&uid=23796