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by GregK
Thu Jul 18, 2019 5:13 pm
Forum: Kitesurfing
Topic: Naish ditches octopus system.
Replies: 31
Views: 1825

Re: Naish ditches octopus system.

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...
by GregK
Wed Jul 03, 2019 5:56 pm
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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 "
by GregK
Tue Jul 02, 2019 8:18 pm
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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.
by GregK
Tue Jul 02, 2019 5:12 am
Forum: Kitesurfing
Topic: Tear-Aid Type A one side or two sides for canopy repairs?
Replies: 7
Views: 284

Re: Tear-Aid Type A one side or two sides for canopy repairs?

+1 for what Chris recommended.
by GregK
Fri Jun 28, 2019 7:42 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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...
by GregK
Fri Jun 28, 2019 6:27 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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.
by GregK
Fri Jun 28, 2019 3:01 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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...
by GregK
Fri Jun 28, 2019 2:46 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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 ...
by GregK
Fri Jun 28, 2019 2:31 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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 ( ...
by GregK
Fri Jun 28, 2019 2:19 am
Forum: Kitesurfing
Topic: Aluula ? New Revolutionary Material from Ocean Rodeo
Replies: 193
Views: 15596

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

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...

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