[hpv-boats] Sleeved Shaft

[v garza]

Rick, lots of good info on material I don't know much about, Thanks! I did 
use a 0.18" pultruded CF shaft sometime ago until it tangled in a root and 
fractured. It was great, unlike anything else while it lasted, for my 
particular gadget. I am trying for even thinner and lighter using maybe one 
carbon mesh layer, since there is not a lot of torque demand in normal 
conditions. The lighter the lever arm in my application the better. I have 
also experimented with longish tapered spinners fore and aft of the prop, 
made from lightweight FLOATING material. Interesting advantages to these 
spinners when combined with a lightweight shaft and prop, as it introduces 
some upward forces that allow some degree of reverse, among other things....

Vic


----- Original Message ----- 
From: "Rick Willoughby" <rickwill at bigpond.net.au>
To: "HPV Boat" <hpv-boats at bikelist.org>
Sent: Monday, August 16, 2010 9:26 PM
Subject: Re: [hpv-boats] Sleeved Shaft


> Vic
> It could easily reduce to half nominal diameter.  The fibres will run  a 
> little straighter so will increase buckling resistance but not so  much to 
> torsional rigidity.
>
> If you only wanted to go to around 1/4" overall you might get 3  layers on 
> something starting at 1/8".  I think you would have to wait  for some 
> initial cure before putting on each layer.  With epoxy you  can accelerate 
> the curing by heating.  The other way would be to  place all layers dry 
> and then really soak the shaft, working until  wetted out.  The fibres 
> tend to form tiny needles that catch on  successive layers as they are 
> slid on.  The more damage the more  needles.
>
> Rick
>
> Thanks, Rick you have given me a lot to think about.  Those are quite
> impressive measurements.
> How thin will the 1/4" mesh go when stretched tight on a rod, as I am
> shooting for about 1/8" on the rod part. That way I can add another  layer
> for strength if needed. Can I get small amounts of the equivalent  epoxy 
> in
> USA, is my next question to research....
>
> Vic
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