Hi,
Here another picture of an older prototype wherein the pivot is visable.
The outer carbon tubes have an OD of 1.7mm so the aluminium tubes are very
thin. This runs extremely smooth.
Correct! Sharp eye ;-) The slots will be closed with a small loop of
kevlar thread.
Btw the base pitch is adjusted by turning the balsa prop spar with respect
to the outer tubes.
Kevin
Op 2 mrt. 2013 06:23 schreef "Tapio Linkosalo" <tapio.linkosalo_at_iki.fi> het
volgende:
> On 1.3.2013 22:49, Kevin Lamers wrote:
> > [Attachment(s) <#TopText> from Kevin Lamers included below]
> >
> > Here a carbon hub I'm working on currently. The main tube weighs 15mg
> > including the bracket for the screws. The tube is 2mm ID and has a
> > 0.05mm wall thickness (2 layers 17 gsm prepreg).
> > I hope the attachment gets through.
>
> Yes, it came out fine. I have two questions: first, you have the prop
> blade hinge as the two carbon tubes pivoting within each other? how much
> friction is there to that hinge? I was discussing component weight with
> Kang several months ago, tried his setup to use a small carbon rod as
> the blade holder pivoting inside the (0.3mm ID) pultruded tube, but it
> felt to me to have quite a lot of friction. I'm slowly coming towards a
> conclusion that these blade hinges should be very free to help adjusting
> the hub... The second question is shorter: what keeps the blade holder
> from pulling out of the hub (when centrifugal force of rotation is
> applied)? Your pitch arm has a slot, so the pitch setting wire cannot
> second as a blade holder.
>
>
>
> -Tapio-
>
>
>
> ------------------------------------
>
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>
- application/x-ygp-stripped attachment: stored
Received on Fri Mar 01 2013 - 22:53:45 CET