Subject: Re: [harryproa] Rudder progress...
From: Dennis Cox
Date: 8/26/2010, 5:06 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

You got it...
 
If you use carbon, you don't need much... if you use glass you need lots more.  Basically the channels are somewhere around 70 to 80% fiber (I think) so its about 80% the stiffness of aluminum and a whole lot stronger, fatigue resistant and corrosion resistant.  Each (bar) of fiberglass on each side has the dimensions 5mm x 32mm and are seperated by 5mm of ply.  If I did my homework right, it should deflect less than an 25mm at the end under the full load lateral load of flying the hull.  The safety factor is above 4, so I'll run it up well above its design load during the test.
Dennis

From: Antonio Tutusaus <atutusaus@telefonica.net>
To: harryproa@yahoogroups.com.au
Sent: Thu, August 26, 2010 4:38:54 PM
Subject: RE: [harryproa] Rudder progress...

 

Dennis:

 

Thanks for the details. So basically the rudder is made of layers of plywood reinforced with tow and epoxy down the middle on both sides?

 

Toni

barcelona

 

 

 

De: harryproa@yahoogroups.com.au [mailto:harryproa@yahoogroups.com.au] En nombre de Dennis Cox
Enviado el: jueves, 26 de agosto de 2010 19:31
Para: harryproa@yahoogroups.com.au
Asunto: Re: [harryproa] Rudder progress...

 

 

Hey Toni,

 

I'll be glad to...

 

My status... a lot less than I thought I'd be... mainly because I can't seem to find much time lately.  I have just shy of 30 hours into it.  I have the lee hull partially  assembled.  It has the bottom and sides attached with stringers in the corners.  I've also attached the fiberglass strands for the pick-up points of the diagonal beams.  I have the blanks for the rudders completed and one has been filament wound.

 

Design brief of the rudders.  Once my first one cures, I'll be stress testing it.  You might want to wait for those results before using any of this.  Some of this is me experimenting.  The proof will be in the test.

 

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