kobo said..





One of the main jobs of the tail is to keep the underwater airplane or foil rig flying in a nice level flight.
If the tail doesn't push down enough it allows the whole rig to point down which is felt as a nosedive.

This is mainly due to drag created from the front foil, and because the 1675 has a lot of camber and surface area it creates a lot of drag which requires more push down from the tail to maintain level flight.

I tried the 232,180, KD maui and crisp333 tails and non of them pushed down enough to maintain level flight. The 202 tail has a pronounced camber which does. Conversely if the tail pushes down too much it's felt as rising front foot pressure and then breaching. I hope that explains it, industry use terms like forward pitching moment as the drag created by the front foil making it want to swing back , and there are other factors like the front foil AOA and COG of board and rider on foil mast placement etc but basically that's what the tail does.

BTW when they talk about a tail like the 202 creating a lot of lift , it means that it pushes down harder and makes the front foil point up more and produce more lift.
The lift of the tail acts in the opposite direction to the lift of the front foil , the tail pushes down and front foil pushes up.

Windoc said..
Great to know, Eppo! Thanks.

Foilmate said..




50 fuse is great for larger foils. I've moved to a 60 fuse to slow the pumping cadence down DWing.But I sit around 15-17km/h max with this set up.Tried red shim yesterday, helped but not significant gains in speed to overcome the giant / thick front wing

Foilmate said..




50 fuse makes a big difference to turning ability, plus less mast flex. It will be my end game.. In the meantime, I went out yesterday with the 50 fuse and was exhausted from pumping. Haven't tried the 70 fuse with it. Would turn horribly but cadence would slow down immensely in the learning phase.Do you find that the board is popping up but not taking off? I'm on a different board but mates are on 7-9 setting on their Armstrong DW boards. I've ridden theirs on setting 7 (+glide 220) and felt like the foil was going to breach the whole time. Whole lot of front foot pressure.

kobo said..





I have used it to increase early lift on the 1675 for paddle ups not to reduce it...but maybe reducing it will allow you to build more board speed paddling and reduce the chances of too early lift off and stalling ??

Foilmate said..
202 pump tail feels ridiculously slow in combination with the 1675. Have you tried shimming the 202? My gut feel is that the 220 glide would be a better for a touch more speed

kobo said..




I know crew that ride Army DW boards can run the 180/140 tails because the tracks are forward enough to compensate for reduced lift. I've been using the 220 tail on my Sunova board with 1675 and that tail has more lift and speed than the 202 but slightly wider so it's a little harder to turn

Pacoo said..




Thanks Kobo, how much do you weight?. I'm using a KT so tracks are not an issue.
I'm incline for the 180, as I don't want to loose turning.
I wish these manufacturers start to provide objective numbers, top speed, and recommend tail, track position etc,
Every new foil is a battle.

kobo said..




I'm 80 kg , and I guess the 1675 is a bit of a specialty foil that was designed primarily as a dock start wing, but it can also be used to learn DW but then you need to tinker with it to tune it for that purpose. If you want plug and play.. the new HAs are the way to go. I bought an 880 put it on a standard 60 fuse on with a 140 tail no shim and away she went and I haven't changed a thing.