Thickness of tiller rope of HM Bark Endeavour

[Hatteras]

What would be the thickness of the tiller rope on a ship like Endeavour or Bounty? The instructions of Occre's Endeavour state that 0.15 mm thread should be used. With a scale of 1:54 this translates to 8.1 mm in reality, less than a centimeter (or about a third of an inch). I can hardly imagine this could withstand the enormous forces exerted on the rudder. Or an I wrong?

 

[AllanKP69]

I believe the rope size they call out is half of what it should be. It is usually a good idea to compare Occre rigging information with sources based on contemporary information such as from Lees Masting and Rigging and Steel's The Elements and Practice of Rigging and Seamanship.

Tiller rope was 0.22Xmain stay diameter. To get to that dimension, the circumference of the main stay was 0.5 the diameter of the main mast. The diameter of the main mast in inches was 0.90 per three feet of the mast length. The length for Bounty and similar size ships was about 2.22 times the beam. For Bounty, working backwards

Beam of 24.4 feet X 2.22 = 54 feet
54/3= 18
18X.9=16.2 inches diameter
16.2X0.5= 8.1 inches circumference for the stay
8.1 / 3.14=2.58" diameter of the stay
2.58X0.25=0.64" diameter for the tiller rope
At a scale of 1:54 the diameter would be
0.64/54= 0.0118 inches
0.0118 X 25.4= 0.3mm so double what OcCre calls out, a big difference.

You may want to check my math to be sure.
Allan

 

[Hatteras]

I believe the rope size they call out is half of what it should be. It is usually a good idea to compare Occre rigging information with sources based on contempory information such as from Lees Masting and Rigging and Steel's The Elements and Practice of Rigging and Seamanship.

Tiller rope was 0.25Xmain stay To get to that dimension, the circumference of the main stay was 0.5 the diameter of the main mast. The diameter of the main mast in inches was 0.90 per three feet of the mast length. The length for Bounty and similar size ships was about 2.2/2.4 times the beam. For Bounty, working backwards

Beam of 24.4 feet X 2.2 = 54 feet
54/3= 18
18X.9=16.2 inches diameter
16.2X0.5= 8.1 inches circumference for the stay
8.1 / 3.14=2.58" diameter
2.58X0.25=0.64" diameter for the tiller rope
At a scale of 1:54 the diameter would be
0.64/54= 0.3mm

Thank you @AllanKP69. That is a very clear and convincing answer.

 

[AllanKP69]

Hi Mike,
I just did a little editing as I transposed some numbers, but the end result is correct, ie: 0.3mm Sorry for any confusion.
Allan