Hello Everyone,
I present my biggest project so far.
A new fuselage which allows to use Takuma Kujira V1 & V2 wings on the ALLURE mast 2023.
It allows to use "custom" stabilizers with your kujira V2 too.
ALLURE is a little french brand but it's reputated here for its great front wings, thin mast and "made in europe" construction. The mast is 13.2mm at the bottom and 14.2mm at the top. It is manufactured at SABFOIL factory in Italy, from HM carbon.
The mast is stiff and thin as the same time. You will re-discover your wings!
Discover the project here : www.kparts-watersports.com/products/Masts-and-fuselages-WINGFOIL-c151687277
I like this, i had to sell the V2 Takuma 85cm carbon mast because it felt too draggy.
-This fuse is made of Alu or Carbon?
-The mast/fuse connection is conical?
-The "rake" shims are mast plate shims or mast/fuse shims?
Thx!
Select to expand quotemcrt said..
I like this, i had to sell the V2 Takuma 85cm carbon mast because it felt too draggy.
-This fuse is made of Alu or Carbon?
-The mast/fuse connection is conical?
-The "rake" shims are mast plate shims or mast/fuse shims?
Thx!
Hello! The fuselage is made of 6082-T6 aluminium, the anodization is made in France. The mast/fuse connection is conical, yes!
And the rake shims are made to be placed between your board and your plate.
Hope that will help ;-)
Hello!
First shippings for my customers in France, Switzerland, Australia. Here are some pictures of the pieces! I chose grey for the fuselages to make them different from the originals Takuma. It is hard and reinforced anodization.
As you can see, I have designed the fuselage for Takuma V2 front wings in order to have 2x M6 threads for "custom" stabilizers like KPARTS or KD Maui stabs. The connection is made thanks to flat 3D shims provided.
Nicely done and the Allure mast looks very nice. Why not try to make it as low drag as possible as long as the cost doesn't become prohibitive. Studies show mast drag to be an extremely low % of the overall drag of a foil system so it's hardly worth putting too much money into pursuing thin. Stiffness is far more important.
Interesting reading on the subject;
projectcedrus.com/cedrus-development/the-state-of-the-mast/
Choice excerpt;
"...A 12mm thick section with 130mm chord length has the same amount of drag as a 19mmx120mm XXXX! Chord length has a massive impact on drag, because it influences wetted area. Increasing chord length by 10% for example, from 100->110mm, increases drag by almost 20%. Changing thickness 10%, going from 18->20mm, increases drag by less than 10%, but increases stiffness by almost 40%"
From my experience, from what I've seen and from various tests I've been able to do, there's a big difference between theory and practice when it comes to hydrofoil design. I was able to attend mast tests with low chord and high thickness versus larger chord with low thickness. It's clear, the thinner mast gave much better sensations. I also tested wings which were excellents on paper, low drag, good lift, with a high efficiency profile. And of course on the water, it didn't work.
So in foil design, it's good to relate to the theory, but the best thing is to test a lot of things and draw conclusions based on real sensations and real performances 
That's what Martin Turbil (from ALLURE brand) and I are doing.
Select to expand quoteanto22 said..
From my experience, from what I've seen and from various tests I've been able to do, there's a big difference between theory and practice when it comes to hydrofoil design. I was able to attend mast tests with low chord and high thickness versus larger chord with low thickness. It's clear, the thinner mast gave much better sensations. I also tested wings which were excellents on paper, low drag, good lift, with a high efficiency profile. And of course on the water, it didn't work.
So in foil design, it's good to relate to the theory, but the best thing is to test a lot of things and draw conclusions based on real sensations and real performances That's what Martin Turbil (from ALLURE brand) and I are doing.
My experience is more limited but i agree 100% with this.
I do not know if the Cedrus designer got those numbers from computer models or actual testing but they do not fit at all with what i have felt riding thicker masts (they felt like dragging seaweed all the time).
I like stiffness too but i am 70kg and i wing/surf with foils around the 1000cm2 size.
I do not need so much stiffness and i do not want it if it comes at the cost of glide.
I have seen a few reviews of the Cedrus mast where the only complaint was the drag.This may not be a factor if you are a big dude blasting in The Gorge in nuclear winds, but for me it is huge.
And surfoil pumping is cardio enough without extra resistance...
Maybe the future will be different thickness/stiffness masts for different riders/purposes.
