Framing

Home
Up
Boat Designs
Cruising Pictures
Boats for Sale
Services
Contact
Search
Site Map

 

Origami boats are sometimes referred to as "frameless". 

In fact only the assembly is frameless.  The boats themselves are longitudinally framed.

The following study shows the effects of various framing styles on the resulting strength and stiffness of the plating.

It can be seen from this study that increasing the height of the frames provides the best result, but uses up the interior space.

"T" and Angle bar style frames are the next best method and significantly better than flat bar.

Hull curvature provides a modest increase in the strength, increasing with the amount of curvature.

 

Stiffness

Strength

Weight

stiffness/weight

strength/weight

Plate Only

0.1

0.5

9.0

0.0

0.1

Flat bar

8.3

2.1

10.5

0.8

0.2

T Bar

29.9

8.1

12.0

2.5

0.7

Angle bar

29.6

8.0

12.0

2.5

0.7

2 angle bars

49.8

14.6

15.0

3.3

1.0

2 flat bars

14.9

4.1

12.0

1.2

0.3

3 flat bars

20.5

5.9

13.5

1.5

0.4

4 flat bars

25.3

7.7

15.0

1.7

0.5

5 flat bars

29.7

9.3

16.5

1.8

0.6

Double width flat bar

14.9

4.1

12.0

1.2

0.3

Double height flat bar

55.6

7.8

12.0

4.6

0.7

1.5 Times height flat bar

25.1

4.5

11.3

2.2

0.4

Curve 1 part in 12

0.9

1.0

9.0

0.1

0.1

Curve 1 part in 6

3.3

2.2

9.0

0.4

0.2