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 Post subject: Re: Helmet build
PostPosted: Mon Sep 30, 2013 12:54 pm 
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Location: Perth, Australia
Everything more than 275-300g is heavy for me. If you're like 100kg, than 500g would be fine I guess:)


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 Post subject: Re: Helmet build
PostPosted: Tue Oct 01, 2013 3:00 am 
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If i made one, a Female mold of the head would be First.
Then take a Male mold off the inside of that, --- and work Out.

What ever you decide on for energy absorbing foam , 1/8th inch thick of that total
would include Nomex-Honeycomb with 8oz Spectra or Kevlar on each side.

The Carbon would go on the Outside, and it would be a Twill weave cause
it's a bit stronger than plain weave, and it Looks way COOLER !!

Bille


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 Post subject: Re: Helmet build
PostPosted: Tue Oct 01, 2013 3:10 am 
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Location: Perth, Australia
Yes, plaster mold is on the way...Need to seal it before any epoxy work.

For that I'm after some PETG which is a heat moldable, see:

http://www.youtube.com/watch?v=ooVBJbYac_4

http://www.youtube.com/watch?v=snL__KCXfCw

Spectra would be great, thanks!


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 Post subject: Re: Helmet build
PostPosted: Tue Oct 01, 2013 4:04 am 
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zob wrote:
I don't know what is a heavy helmet for you.
I bought a ProTec Twoface helmet. It weights 525 g. On the other hand Hero2 weights 225 g (with water proof housing).
I don't think all the work is worth for the bad results you can get.


This for example is acceptable weight. :

http://www.petzl.com/en/outdoor/mountaineering-and-climbing-helmets/meteor-iii


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 Post subject: Re: Helmet build
PostPosted: Wed Oct 02, 2013 6:50 am 
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Location: Perth, Australia
Once again to find something in Perth is not a mean feat.

A rubber sheet 1000x1000x1.5 is AU$110....It's rubber FFS...That's more than a CF!

I do not know what else I can use not to get wrinkles on a top. Any ideas?

Ah, found petg 2400x1200x0.5 $30. Not bad....


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 Post subject: Re: Helmet build
PostPosted: Fri Oct 04, 2013 3:16 am 
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'
'
'
First let me say, I don't want to sound too ruff or stern, on you.

But!

Give 'ead a shake mate!

What are you going to 'make' a helmet for?

Go out and buy one!

You talkin' about protectin' the ol' brain box, the noggin', the day ol' jelly doughnut!

This piece of equipment is not something to be messing around with, in terms of safety.

What ever you make will be unproven. And the only way you will prove it, is if you walk away, or not.

I look ridiculous when I kite. I've got a big old orange life-jacket--It's the vest, not the really old head through the keyhole type!--(people laugh until they have a problem and need to tread water, control their board and fix lines or just sit there and wait for the wind to come up. I just relax floating.) and I wear a bicycle helmet!

Super light, cheap and does the trick!

I've taken some real crashes and was in shallow water and the impact really stunned me. I blew of the plastic on the bike helmet somehow somewhere, too.

I've even tried a hockey helmet and it works just fine, too.

I've seen guys with snowboard helmets and kayak helmets.

Do yourself a favour and just go buy one.

SweetDoug


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 Post subject: Re: Helmet build
PostPosted: Fri Oct 04, 2013 4:54 am 
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Location: Perth, Australia
SweetDoug wrote:
'
'
'
First let me say, I don't want to sound too ruff or stern, on you.

But!

Give 'ead a shake mate!

What are you going to 'make' a helmet for?

Go out and buy one!

You talkin' about protectin' the ol' brain box, the noggin', the day ol' jelly doughnut!

This piece of equipment is not something to be messing around with, in terms of safety.

What ever you make will be unproven. And the only way you will prove it, is if you walk away, or not.

I look ridiculous when I kite. I've got a big old orange life-jacket--It's the vest, not the really old head through the keyhole type!--(people laugh until they have a problem and need to tread water, control their board and fix lines or just sit there and wait for the wind to come up. I just relax floating.) and I wear a bicycle helmet!

Super light, cheap and does the trick!

I've taken some real crashes and was in shallow water and the impact really stunned me. I blew of the plastic on the bike helmet somehow somewhere, too.

I've even tried a hockey helmet and it works just fine, too.

I've seen guys with snowboard helmets and kayak helmets.

Do yourself a favour and just go buy one.

SweetDoug


Point taken.

How about this: you are hooked on an unproven kite! Gosh. It's unproven! Not certified!

You can only walk away if you did not break a neck. And of that my friend, helmet will not protect you...I would know, I'm a paragliding pilot.

Soooo many ppl I knew never walked away. It' a false security thinking a helmet will save you. And than, being a 100% paraplegic below a neck is a bit less bad than a 100% brain injured.

Think Christopher Reeve.

PS
I would rather have a titanium helmet than a cycling one. Titanium would be really cool hey?! :)
Btw titanium is a material of choice for cranioplasty.

PSS

I've asked here coz we build stuff. We are not an average street joe's who just buy, buy and buy more stuff...


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 Post subject: Re: Helmet build
PostPosted: Fri Oct 04, 2013 7:41 am 
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Location: Perth, Australia
Today I've got a petg sheet. Pretty cool stuff that.

Tomorrow will try to build a small vac table off peg board, and hopefully vac a first FG run. I got an idea how to build an inner foam with the Divinycell 5mm. Might be puuurfect...

This:

http://www.amateurboatbuilding.com/articles/howto/foam_sandwich/planking.html


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 Post subject: Re: Helmet build
PostPosted: Fri Oct 04, 2013 8:37 am 
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Location: The Naki
Have you though of making two and testing one to destruction to see how it stands up?

You can most likely google helmet safety tests and replicate them.

PS don't listen to the nay sayers telling you, you can't do it. What they really mean is they can't do it. They are then applying there own limitations to your situation.


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 Post subject: Re: Helmet build
PostPosted: Fri Oct 04, 2013 8:54 am 
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Location: Perth, Australia
plummet wrote:
Have you though of making two and testing one to destruction to see how it stands up?

You can most likely google helmet safety tests and replicate them.

PS don't listen to the nay sayers telling you, you can't do it. What they really mean is they can't do it. They are then applying there own limitations to your situation.



Yes. Will kick ass one or more with a concrete slab... Just for my own piece of mind. Or for the nay sayers:)

But first things first...


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