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DIY Mast Construction

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tahoedirk
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Re: DIY Mast Construction

Postby tahoedirk » Thu Oct 22, 2015 1:51 am

Big cane
Great question with no correct anwer. Sword 2 goes concave due to extra thin , parallel trailing edge. Spotz,2 does not. Lot's of different designs work well .

My first 19mm symmetrical mast was amazing until I wanted to go 25 . Now that I struggle to go 35 it's a whole new game. I don't really want to go slow any more.
Hydrofoils are awesome , they go straight up and downwind FAST , as well as jumping to the moon!

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downunder
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Re: DIY Mast Construction

Postby downunder » Thu Oct 22, 2015 2:51 am

Denisesewa wrote:Just in case anyone wants to know about the validity of Divinycell / corecell as a core material, this is a cross section of an MHL Lift strut I shortened.
DSCN1414.JPG

Cheers. One photo says 1000 words...

It is even visible, if I see it right, where two div./corecell pieces are joined. And there is no stringer or an I-Beam to worry about. I still might throw it in.

Awesome.

I've built a mini tuttle mold yesterday, ready to pour some tuttles :) So pumped!
Last edited by downunder on Thu Oct 22, 2015 3:24 am, edited 1 time in total.

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foam-n-fibre
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Re: DIY Mast Construction

Postby foam-n-fibre » Thu Oct 22, 2015 3:01 am

Wow, there's been some great info on this. Yes I see that centre seam too. Downunder I think you are way ahead of me on this, at this time of year there's no point in starting a build here now.

Thanks for the great info
Peter

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Re: DIY Mast Construction

Postby bigcane » Thu Oct 22, 2015 6:59 am

Thanks Denisesewa, thats great info. Planning to start my second build soon. This time i think I'll try the table saw to shape the wood core to the template rather than just using the grinder. I like the wood core method, it ends up quite strong at lower cost as you do not need huge amounts of carbon.

granini
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Re: DIY Mast Construction

Postby granini » Mon Oct 26, 2015 1:36 pm

Hi,

I build my own mast / strut with the following layer Setup from outside to core:
- 92gr carbon fabric(woven)

3 times (in total 6 layers):
- 400 gr biax 45/45
- 200 gr unidirectional

3 times uniderectional 200gr

And as core 400 gr biax + 20 rovings.

In total 10 layers + Center layer were applied using vacuum Infusion with a mole. The 80 cm mast has an US box head. The whole mast weights ready 1100 gr and is quite stiff.

Chheers

Granini

GBH Riv
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Re: DIY Mast Construction

Postby GBH Riv » Mon Oct 26, 2015 9:39 pm

This is my attempt using fibreglass to test the process .
George
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2015-10-27 07.27.12.jpg

Denisesewa
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Re: DIY Mast Construction

Postby Denisesewa » Mon Oct 26, 2015 10:03 pm

GBH Riv wrote:This is my attempt using fibreglass to test the process .
George
your construction looks great , I would caution however that the rather blunt Leading edge and that the high point of the foil appears to be about 20% chord , this was the cause of ventilation issues with my first foils, since corrected by moving the high point to about 40% and having a sharper leading edge.
Otherwise great work, you should do a build thread to document the process.

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Re: DIY Mast Construction

Postby kitexpert » Mon Oct 26, 2015 10:05 pm

Nice work, GBH Riv.

Your mast profile looks very sleek and hydrodynamic, but is quite thin and asymmetric. Is it ridgid enough for torque and bending, esp. for torque?

Perhaps Denisesewa's "present DIY" is better approach.

Thanks D for drawings, that mast section was interesting too.

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Re: DIY Mast Construction

Postby GBH Riv » Mon Oct 26, 2015 10:56 pm

Thanks for the input much appreciated , I have been using my production foil that I have as a guide been riding it for 3 Years . I have been following your posts Denisesewa its good to read your practical experiences and development I have been pondering the issue with the strut profile for a very long time I am not sure but what I have seen and tried it appears that if your strut is on the wide side the profile needs to be more symmetrical with a more pointy leading edge but these foils seem to be slower whereas the narrower foils the wide point seems to be more forward nearer the leading edge and also looking at surfboard fins this seems to be the case . It has been explained to me that as the water hits the leading edge it needs to slow down enough so when it passes the widest point it follows the foil shape and not vortex . If the water passing the wide point is going to fast it will vortex and not follow the foil shape . My foil profile is 13mm wide and 120mm long .My final build will be from carbon I am using fibreglass just to test my production method and get it wright. George

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Re: DIY Mast Construction

Postby Denisesewa » Mon Oct 26, 2015 11:15 pm

GBH Riv wrote: It has been explained to me that as the water hits the leading edge it needs to slow down enough so when it passes the widest point it follows the foil shape and not vortex . If the water passing the wide point is going to fast it will vortex and not follow the foil shape .

That makes sense.


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