compound curves in plywood

nafod40 :

BA-100 wrote:
Does the cedar strip technique you mention use multiple layers of
veneer? Presumably you need a form to wrap this around. Does it have
to be solid or can you just use formers, say, every 9 inches or so?
How do you clamp to get a good bond between layers?

A different build method from cold moulding. Does not use veneers.
Here's a great site on the strip-built approach.

http://www.guillemot-kayaks.com/Buil...ilt/index.html


OK, now i'm totally confused! Most canoes i've seen seem to have their wood
running at about 45 deg. This looks pretty much just like strip planking
any boat!
I used to build models like this, using strips of balsa from nose to tail.
I've never seen a full sized aircraft using anything like this. Most seem
to use either sheets planked on formers, like many thirties glider like the
Minamoa or other european high performance saillanes of the thirties as
well as the Albatross of WW1, or the Lockheed method. (And BTW, the guy who
says the dutch built stressed ply airplanes for the Germans is a bit off
course, Tony Fokker only built those things under duress, he hated them and
didn't design them, rather, he and his chief dsigner, Rheinhold Platz,
developed the steel tube fuse we all came to know and love, but I digress)
There were a few inthe late thirties, notably the Timm aircraft and one
odball little twin, the Langley which used something called the "Vidal"
method of contstruction which apparently involved about 5,000 sq feet of
veneer and god knows how much resin to make one airplane. Pretty litle
thing

http://www.aerofiles.com/langley-twin.jpg
http://www.aerofiles.com/langley-twins.jpg

As you can see, the unpainted versions clearly show a 45 on all the wood
visible. Presumably, the underlying layers al go 90 deg to each other.
You gotta love the way the did the cowls out of wood as well!

http://www.aerofiles.com/langley-twins.jpg There's little doubt but that
this airplane would be nigh on impossible to build at home, but surely one
of these must be able to produce the simple teardrop that is the Baby's
pod. By the way, on the original, the teardrop is pure. That is, the fillet
between the teardrop pod and the wing was not all one piece. That fairing
is added on afterwards and is non-structural, which,it seems to me, would
simplify molding the pod no end.