Recent Code Zero 0.8 and all P&H branded Code Zero sails have no windows. The window only gives a view of the sky anyway.
The batten, boom and gooseneck fitting are unchanged from previous generations of the sail. Also unchanged is the neat and expert way the sail has been cut, assembled and sewn.
Many kayakers will not bother to use their sails upwind but it is worth the effort learning how to do so. The Grand Prix sail material is stiffer than the original dacron material and it is a little more difficult to judge how high to the wind you can paddle sail without luffing (back winding) the sail. The softer dacron sails definitely showed the when the leading edge back winded at an earlier stage. I was not bothered by this but if beginners are particularly concerned about beating performance (rather than just blasting downwind having fun) they could thread a wool tell tale through the luff of the sail about half way up and in front of the batten. The tell tale should blow horizontal sailing close as possible to the wind but if you point too high into the wind it will start to move vertically. Swapping between two Aries kayaks, one with the Code Zero and one with the Trade Wind 80, the experienced paddler found it easier to out point the other paddler when using the Trade Wind 80 upwind in a F3-F4. However, down wind there was little difference in speed between the two sails. Interestingly the flat area behind and above the batten often appeared to be back winding when close hauled but the full part of the sail below the batten continued to pull strongly.
One thing I did notice about the new sail is I find it easier to control upwind in stronger winds. It feels much more stable than the previous dacron versions of the sail. Although they may be softer and more forgiving, they lack the feeling of stability and power of this new sail. I think the Trade Wind 80 sail's very solid feel is due to its centre of effort being much more static. Basically I like the feel of Trade Wind 80 a very great deal when going upwind. It also proved particularly effective upwind in combination with the Aries using a forward fin.
At the end of this test there was no sign of wear, cracking or delamination in the three sails on test.
In Europe, the FEKS Trade Wind 80 is available from Kari-Tek. Price in the first batch is the same as the outgoing Code Zero i.e. £198 (exc. mast and fittings) then subsequent deliveries will be £218. If you are in the Southern Hemisphere keep an eye on the Expedition Kayaks web site as they are main distributor in the FEKS's native Australia.
Phil and I have been using free loan sails that remain the property of Flat Earth Kayak Sails, the only cost to us was the postage from Australia. I have however, bought three other FEKS sails at full price. Neither Phil nor I have any financial interest in FEKS. Ian bought his sail for full price.