[hpv-boats] V15 Shaft

[v garza]

----- Original Message ----- 
From: "Rick Willoughby" <rickwill at bigpond.net.au>
To: "HPV Boat" <hpv-boats at bikelist.org>
Sent: Sunday, August 15, 2010 5:36 PM
Subject: Re: [hpv-boats] V15 Shaft


> Vic
> It was only a single layer.  The epoxy was Solid Bond 330.  This is  the 
> TDS:
> http://www.solidsolutions.com.au/datasheets/tds_er_epoxy_bond_430.pdf
> The bond did not break but it would not have reached fully cured  state 
> when I tested.
>
> The fibres were tight to the steel because I hung the shaft from the  tube 
> to stretched it while it cured.
>
> I had intended to use up to 3 layers but the tubing I purchased was  too 
> small to allow that.
>
> There is no doubt that building up the number of layers would add 
> stiffness.  The idea is fine but my initial execution was poor.  I  would 
> recommend it if you want a torsionally stiff lightweight shaft  that will 
> bend.  You could build it up on any round section material  as a former. 
> It should be a complete seal so electrolysis will not  be an issue.  The 
> connections would also be epoxy gued.

Rick, if you can suffer one more pesky question? This can be answered with a 
yes or no.

Do you think there would be enough LONGITUDINAL stiffness in a tube formed 
from layers of the expoxied mesh alone, to mimic the round section 
behaviour, IF you dissolve out the round section?

Hope this makes sense, as I as my goal is to get the lightest, thinnest, 
strongest, flex shaft possible.

Vic

>
> Rick
>
>
> Was this shaft you constructed covered with only a single layer of  carbon
> fiber mesh tube?
> What kind of epoxy did you use, and did you use the heat shrink tubing
> method to tighten up to the shaft?
>
>
> Could that angle strength be improved somehow, say by using multiple 
> layers
> set in offset mesh pattern, alternately reversed from a lengthwise
> direction?
>
> Thanks,
>
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