thedoor forum posts in last 60 days

Grantmac said..
Thoughts on putting a mast track on a higher volume flat rocker wing board?

PatK said..
After riding the Severne Alien some years i got a Predi 110. It is great. I love the skateboard feeling. The SAB 799, 909 and 969 are amazing. The 999 needs to remove the straps forward to get it balanced. Missing tracks, also missing a soft deck around the footpads.

Grantmac said..
After a multi-year relationship with winging I'm becoming tempted by some freeride foil and moving towards foilstyle.

Thing is I'm pushing 100kg in gear and I don't want to be swimming home. All the equipment looks to be barely uphaulable at most or a full on sinker at worst. Availability isn't great either.
Would I be completely off base trying to find a Wizard 130? Or should I focus on the 114 and deal with a lack of low end. Ideally I'd like to be getting on the water in 12kts.

Foil I'm less concerned about. I've got the Balz 909/370/93cm and all I should need to get is the 903K fuselage.

Mark _australia said..
I would expect a carbon track has an outer glass layer to prevent metal to carbon contact. Metal and carbon in saline is literally a battery. Electrolytic corrosion.

Mark _australia said..
I would expect a carbon track has an outer glass layer to prevent metal to carbon contact. Metal and carbon in saline is literally a battery. Electrolytic corrosion.

jaumet said..



Hey thedoor!

Yeah you got it right.
If you want to improve pitch stability on an wing-tail configuration you can either move the CG forwards or moving the NP Aft.
In these foiling craft the position of the CG is driven mainly by the weight of the Rider. However, the position of the rider cannot be arbitrarily set like in an aircraft (a wingfoil has no control surfaces) and so its position is a consequence of the overall external pitching moments (Drag and Lift of the Foil, Board and Sail). Lets say that the rider position is the control surface for pitch balance.

Therefore the only thing that we can actively in this case to improve Stability to move the NP aft is to increase the Tail Volume (again aircraft terminology).
In plain english this is to produce as much lift and as far aft as possible. This can be done by means of a larger fuselage (longer lever) or by making the stab larger or running it at a higher angle of attack.

Making the board longer from the front would not impact the stability as it does not affect the weight or the forces on the system much.

Hope this answers your question