[hpv-boats] re CF Blades

[v garza]

Rick:

Great looking prop, thanks for posting.

Have you reached perfection with this prop, so it can be used with your 
other boats as well? Or is a dedicated prop for your racing machine? If you 
can go to mass production, perhaps others would be interested in a 
purchase....

Thanks,

Vic
----- Original Message ----- 
From: "Rick Willoughby" <RICKWILL at bigpond.net.au>
To: "HPV" <hpv-boats at hupi.org>
Sent: Thursday, March 08, 2012 2:34 AM
Subject: [hpv-boats] re CF Blades


> Rick
>        How much of a weight difference is there
> between the CF blades and steel ones?
> Do you provide a slot in the hub for the shaft
> or do you leave it blank. Being a nylon hub
> it wouldn't be hard to drill.
>
> Ian
>
> Ian
> The normal stainless blades weigh 70g.  Remember this is quite a  small 
> prop.  The CF blades currently have an aluminium core and weigh  20g.  The 
> core is needed for twist strength as I am only using  unidirectional fibre 
> lengthwise on the blade to resist bending.
>
> The next ones I mould will have a stainless steel strip for the  core. 
> This will add a bit of weight and should help deployment as  well as 
> stiffness against twisting.
>
> There is much less effort in making these blades compared with  grinding 
> stainless steel.
>
> I was surprised how easy it is to get a perfect blade from the  mould. 
> The mould cost a bit but it is well made and virtually  guarantees a good 
> result.  The mould maker had not used CF for  reinforcing before so it was 
> an experiment for him as well.  He has  made a mould for a larger 
> fibreglass prop used for wind turbine and  thousands of others moulds but 
> mine is tiny by comparison with these.
>
> Rick Willoughby
> rickwill at bigpond.net.au
>
>
>
>
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