Interesting mold making video

[Flatiowa]

At approx 3:20 mark it reminds of this

Eliminate conventional spars and ribs. Use stressed skin and an internal web, similar in cross section to corrugated cardboard. Mold entire fuselage shell and an interior reinforcement - the latter doubles as internal outfitting for seats, baggage, etc.

Here's the picture of our race plane's horizontal. Five parts for the stab, manufactured in three tools. Parts are self jigging so total stab assembly time was about two hours on a Saturday morning.

I could see the same sand/cement method working with hot wire type patterns as it does the center pivot and pattern board.

 

[Pops]

 

[Tiger Tim]

 

[Victor Bravo]

 

[Bille Floyd]

 

[Flatiowa]