Correct name for the valve in the new Pivot is a halkey-roberts ( http://www.halkeyroberts.com/products/inflation/boat-valves/690-nsbvg-boat-valve.aspx ) , definitely not a Boston valve, which Naish ( and many other brands ) were using previously. More info and pictures of Boston valves here - https...

pj sofine wrote: ↑

Wed Jul 03, 2019 1:32 pm

After 14 pages,can someone explain how aluualalalua is pronounced ?

I believe it's " Ah - Loo - La "

The material may also see applications in inflatable SUPs and kayaks.

As material production volumes increase, material price tends to come down, so hopefully there is broad / multiple sport applications.

+1 for what Chris recommended.

Getting pretty far off topic - maybe pressurized fabric tubes needs a separate topic - who is willing to start it ??

Maybe we can entice Bill Hansen, an undisputed expert, to clarify the muddle...

tilmann wrote: ↑

Fri Jun 28, 2019 6:07 am

... a kite where the ends are bending away in strong gusts...

Look closely next time this happens and I suspect you'll see that the ends aren't bending ( smooth, gradual deformation along the LE length ) but are actually kinking or buckling, with most of the bending happening at one point.

This is incorrect. Increased pressure does increase bending stiffness. Feels wrong, but no, bending stiffness is the same. Do a free-body diagram analysis of a theoretical model ( cylindrical thin-walled pressure vessel ), calculate the bending stresses and stress induced from lower and higher inte...

Here the link to the K-forum page with the article by the Navy ( got that wrong ! actually Naval Undersea Warfare Center Division ) - see the 3rd post from the top, by nixmatters : https://kiteforum.com/viewtopic.php?f=1&t=2401290&start=70 Read the two articles referenced in this post, they explain ...

Are you saying pumping LE to 4PSI and pumping same LE to 12PSI will result in same resistance to bending? Let me answer this in another way : Two identical kites, one pumped to 4 psi, the other 12 psi. Fly them in a very light breeze, the load on their airframes is quite light, both will deflect ( ...

Are you saying pumping LE to 4PSI and pumping same LE to 12PSI will result in same resistance to bending? Yes, although it "feels" wrong, US army researchers investigated the bending stiffness of inflated tubular structures, measured it, and confirmed a theoretical analysis of a pressurized thin-wa...