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Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 2:51 pm
by jumptheshark
I think I'll venture into Aluula from the big side of the kite spectrum. Well, more accurately the mid size. I want to spend the money where I use it most, and that is by far and away my 8-9m range. Want to size any new significantly lighter kite to take over for my 8.4m cloud, and take a bite out off the range of my current 12 and 6m kites.

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 3:09 pm
by alford
iriejohn wrote:
Wed Aug 28, 2019 4:09 am
alford wrote:
Wed Aug 28, 2019 2:55 am
Was that board a Mako? Shape looked like one but not color. Anyone?
It has "MAKO" written on it.
Funny! I was looking at it on my phone, forgive oh great one!

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 6:16 pm
by geokite
Not sure if it has been mentioned already, but I would think the biggest usage for a stronger fabric like Aluula would be to make a LEI paraglider (so it can survive the increase in pressure with altitude).

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 7:36 pm
by SENDIT!
Toby wrote:
Tue Aug 27, 2019 11:34 pm
I want a 20 !
I KNEW IT! :lol: :lol: :lol: :lol:

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 7:46 pm
by JakeFarley
I wonder how over time the Aluula fabric will fare, giving repeated stresses and fatigue. Have any tests been performed on Aluula in this area?

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Aug 28, 2019 8:24 pm
by SENDIT!
I got a chance to ride both the 14.5 Flite Black and a prototype 9.5 Prodigy (don't know if it will be "Black" also, but the LE was gold Aluula). I'm not certain where the claim originated for more power per size, but I can't really comment on that. I'd have had to flown a non-Aluula back to back with the Aluula version and I didn't do that. As jumptheshark was saying, what we may discover is that with that faster/lighter kites, it may sort of seem that way. I don't know, but I look forward to finding out.

What I CAN say with certainty is that the 14.5 turned more rapidly than any that I've flown before, that's without a doubt. Considering that the wind was light (14 mph) and I (230 pies) was on a Slingshot Glide (nice improvement on that this year, btw) and was just sort of effortlessly whipping the kite around. I was just out there having fun and enjoying how lively it was. I exercised better judgement and ignored the inner voice that kept shouting "LOOOOOOP IT!!!!!" :lol: I didn't know how much I was doing that until I came in and Todd Horn (OR Rep and super nice guy) laughed and said that he'd pointed out to someone else that I was really "manhandling" the kite.

Bottom line I think, we are all in for an improvement in our gear, whether this year with OR, or sometime later with *insert your favorite brand here*. Living in light wind area like I do, I think I will probably have plenty of my local riders that will want one just like I do. More days on the water are coming! :)

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Mon Sep 02, 2019 9:24 am
by pmaggie
Any news on release date/price etc.?

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Wed Sep 04, 2019 7:33 am
by Matteo V
blu wrote:
Fri Aug 09, 2019 9:28 pm
and you can order any color as long it's black- why?
please give us a choice of different colors
From the other thread....

I learned an important lesson today on why black is the best LE color. Frickin charcoal all over the beach from beach fires makes other colors ugly on just one landing. I definitely would never buy a kite with any other color on the LE.

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Thu Sep 05, 2019 1:12 pm
by ldmelo
OzBungy wrote:
Wed Aug 28, 2019 7:13 am
It has been suggested that an Aluula kite will be double the price of normal kites. It would want to have more than double the performance of a normal kite for that to be at all attractive.
Best thing is... probably the already good non-alula kites will get a price drop .....

Re: Aluula ? New Revolutionary Material from Ocean Rodeo

Posted: Fri Sep 06, 2019 1:19 am
by GregK
GregK wrote:
Fri Jun 28, 2019 2:19 am
... US army researchers investigated the bending stiffness of inflated tubular structures, measured it, and confirmed a theoretical analysis of a pressurized thin-wall structure subjected to bending : the stiffness is independent of inflation pressure, both in theory and in practice. ...
CORRECTION - I went back and reviewed the test results and simulation/modelling work reported in these articles, and my summary above is not correct.

While their analysis and test results confirmed the linear dependence of the onset of buckling ( or wrinkling as they called it ) with respect to inflation pressure, their test results also clearly showed that increased inflation pressure does increase the bending stiffness of woven fabric inflated structures.

It was not a linear relationship, in the first test reported ( a 6-inch diameter un-coated plain-woven Vectran fabric air beam with a 2:1 ratio of weft-to-warp fiber density ) in the low-load region of the test below the onset of wrinkling, bending stiffness increased with pressure with slightly less than a linear dependence, about a 0.7 order or power relationship.

In their second test series using a smaller 2-inch diameter air beam with everything else similar to the first series, the bending stiffness increased with very close to a linear relation to inflation pressure, about 0.9 order.

And in their third series of tests, only two test pressures were used, so not enough data from which to determine a relationship, but definitely an increase in bending stiffness with the higher inflation pressure.

It is an over-simplification to assume plain-woven fabric will act with isotropic in-plane properties. When inflated, the axial or hoop load in the fabric will be twice the axial load, creating shear stress, to which the woven fabric's response is complex ( weft-warp fiber slip & friction, weft-warp fiber angular shift ) and non-linear, not a function of material properties, but rather a system property. Also increased inflation pressure alters the weave crimp, the undulating pattern of fibers running over and under adjacent fibers in the weave. Alterations in crimp geometry, termed crimp interchange " is a source of nonlinear load-extension behavior for fabrics " - a direct quote from the first article.

So go ahead and pump harder, your kite does bend less with higher inflation pressure.