I think Butch is referring to the carbon-steel

problem that

Airbus has.

Those parts look great Butch, looks like this thing

is

for real.
--
Perry Mick
Duckt N7XR

Perry!!........You doubted me??.........Shame on you :-)

FYI, even the Shank Jig is done, per the attached
drawing.

Unfortunately I had to take time-off from my life, due
to a HUGE personal set-back.

No I didn't doubt you.  I know you're serious and dedicated,
it's just great to see the real hardware!

No Perry, I'm not referring to the AirBus mishap. I
happen to whole heartedly agree with Paul's assesment of
de-lamination/separation of the lay-ups, further
exacerbated by the elements (Moisture) seeping in. I
have personally witnessed this early on the infancy of
Composites, in my brother's Yacht Club.
As far as I'm concerned, the chances of this occurring
in our Prop Blade is zilch to none since it operates as
a HUGE centrifuge.

It's my ignorance of Composite construction
(Epoxies),that makes me very eerie of the bonding
strength of dissimilar materials joints, vs time.......
So Perry, make sure that you OVERKILL the Shank to Blade
Hub joint. I'll take the additional weight even if I
have to fly on an empty stomach to compensate for it ;-)

                                     Butch

Well, unlike Mr. Rutan, I don't know how to calculate
how much "stuff" to use building these things, so I tend
to make them "bulletproof". I guess I should take a course
in "composite engineering".

I'm making a carbon-fiber fan now for someone else,
very similar to the one I've been flying for the last two years.
That carbon is incredibly fun to work with, and the light
weight is amazing.  I build the three fan blades simultaneously
and they tie into each other in the center.  When this is
complete the fan is incredibly light.  I then build the
hub filling in the gaps between the blades, that is when it
gets heavy, but all the weight is in the hub.

The LAEV blade will be much larger than my fan blades and
will absorb more HP, believe me it will be overbuilt.
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

 
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