Rudder/Centreboard shaping

On Sun, 13 Jul 2003 22:03:37 +1000, "Andrew Denman"
<megnden.RemoveThis@internode.on.net> wrote:

 >Hi,
 >
 >heard of a method of shaping foils by constructing a jig for a router.
 >Anyone done this or have a link for some pics?
 >
 >TIA
 >
 >Andrew
 >

There is a propellor making machine on sale which
works on this kind of principle.

In its simplest form, imagine a smooth tube on which
the cross bar of a letter "H" slides.
On the left top spoke of the "H" is a pointer, on the right top
spoke of the "H" is a router
On one of the bottom spokes of the "H" is a counterweight, so the
whole thing balances about level.
The propeller blade master is held down parallel to the H vertical
bar,
The blank is held parallel to the other vertical.

After setting up, the pointer is carefully moved over the master,
while the router profiles the blank.

Brian Whatcott Altus OK<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rudder/Centreboard shaping 

Andrew,

What Brian descrided is call a pantograph. I think. Do a Google search
for it and you will get more info than you ever wanted.

Ron
 >> Stay informed about: Rudder/Centreboard shaping 

On Sun, 13 Jul 2003 22:03:37 +1000, "Andrew Denman"
<megnden DeleteThis @internode.on.net> wrote:


I'm not gonna discount your desire to use a router but I'm going to
make a suggestion that you think about a right angle grinder with a
(about)36 grit wheel I've created paddles and a
rounded/shaped/flaired keel





 >Hi,
 >
 >heard of a method of shaping foils by constructing a jig for a router.
 >Anyone done this or have a link for some pics?
 >
 >TIA
 >
 >Andrew
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rudder/Centreboard shaping 

"Andrew Denman" <megnden RemoveThis @internode.on.net> wrote in message
news:3f114a7e$1@duster.adelaide.on.net...
 > Hi,
 >
 > heard of a method of shaping foils by constructing a jig for a router.
 > Anyone done this or have a link for some pics?
 >

I've used a table-saw with a dado-blade and a NACA foil template for setting
the blade angle and height. I use multiple longitudinal passes, stopping
short of the end of the stock to leave the top squared off for easier
attachment to the rest of the rudder assembly. a Here's what the template
looks like:

<a style='text-decoration: underline;' href="http://www.fototime.com/C8B026E54F3183C/orig.jpg" target="_blank">http://www.fototime.com/C8B026E54F3183C/orig.jpg</a>

And here's a comparison of using that method vs a router:

<a style='text-decoration: underline;' href="http://www.fototime.com/ED5A7A8CBB17B99/orig.gif" target="_blank">http://www.fototime.com/ED5A7A8CBB17B99/orig.gif</a>

And the last rudder blade I built using the method:

<a style='text-decoration: underline;' href="http://www.fototime.com/47D7C04ECDB5C13/orig.jpg" target="_blank">http://www.fototime.com/47D7C04ECDB5C13/orig.jpg</a>

Mark<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rudder/Centreboard shaping