Hello all,
In a thread where the plans of the Hohenzollern-model from Heinrich Winter's book were presented as representing a Dutch warship of 1664, I posted this drawing:
In red the mainframe of a Dutch warship of 1703, in blue the mainframe of a Dutch warship of 1664. I hope it is clear from this drawing that the mainframe of the Dutch warship of 1664 is very flat.
Then I did some more research into the shape of the mainframe of the Hohenzollern-model which I would like to share here.
(Beware! The drawing above was made in the conventional way: the contours show the outside of the mainframes. Since Heinrich Winter measured the Hohenzollern-model on the outside of the hull, and not on the outside of the frames, all four following drawings show the contours of the outside of the hull of the Hohenzollern-model.)
The flatness of the Dutch warship of 1664 we see in the drawing above, we do not see in the plans of the Hohenzollern-model from Heinrich Winter's book. In the plans from the book we see a mainframe that is not flat at all. Here is that mainframe:
In red I added a rising line that starts where the planking touches the keel and that is tangent to the contour of the planking of the mainframe. This rising line is at an angle of 13,73° with the horizontal.
I drew this rising line because we can find a similar rising line on a drawing that was made before the plans in Winter's book were made. Here is that preliminary drawing:
The rising line I mentioned is marked with 'Anstieg' and I marked it in green. This rising line is at an angle of 9,80° with the horizontal.
So the green rising line on this preliminary drawing is at a much smaller angle with the horizontal than the red rising line from the plan from the book.
Please note that the preliminary drawing also shows the values Winter noted when measuring the Hohenzollern-model. These values show that Winter only took measurements three station lines down from the waterline 'WL', he did not take measurements from the bottom of the model. The only measurement he took from the bottom was the rising line marked 'Anstieg' and the distance from the keel where this rising line touched the outside planking at the position of the mainframe of the model. He gives a value of 'ca 14 cm' for this distance.
That the angle of the green rising line on the preliminary drawing is not just a simple drawing mistake, can be seen on a second preliminary drawing that shows a similar rising line. Here is that second preliminary drawing:
I marked the rising line on this preliminary drawing in blue. This rising line is at an angle of 9,32° with the horizontal. Since this second preliminary drawing is a bit deformed, I think we can say that the two preliminary drawings show approximately the same rising line angle.
A drawing like the second preliminary drawing can also be found on one of the plans from Winter's book; on 'Tafel IV'. Here it is:
I drew a rising line in magenta this time. As you can see it is at an angle of 13,69° with the horizontal, and therefore confirms the angle of 13,73° of the red rising line on the other plan from Winter's book.
I think we can conclude from this that something went wrong when the preliminary drawings were transformed into the plans from Winter's book. The preliminary drawings show a much flatter mainframe than the plans from Winter's book. So the plans from Winter's book probably do not show the shape of the hull of the Hohenzollern-model.
When we add this problem to the other problems we can find in the plans from Winter's book, wrong shape of the transom, wrong gun port positions etcetera, I think we have to conclude that it is impossible to retreive the shape of the hull of the Hohenzollern-model by using the plans from Winter's book.
Now let's compare the angles of the rising lines that we found on the preliminary drawings, 9,80° and 9,32°, and the angles of the rising lines we found on the plans from Winter's book, 13,73° and 13,69°, with the angles of rising lines we can draw based on information from two contracts for Dutch warships of 1664.
Here is the rising line of the 'blue ship' of 140 feet of the first drawing above. Drawn on the outside of the planking, like on the plans from Winter's book:
As you can see the rising line for this Dutch warship of 1664 is at an angle of 5,74° with the horizontal.
And here is the rising line for a Dutch warship of 160 feet of 1664:
The rising line for this Dutch warship of 1664 is at an angle of 6,45° with the horizontal.
So the rising line angles of the actual Dutch warships of 1664 are much smaller than the rising line angles on the preliminary drawings, which are much smaller than the rising line angles on the plans from Winter's book. When we compare the rising line angles of the actual Dutch warships of 1664, 5,74° and 6,45°, with the rising line angles on the plans from Winter's book, 13,73° and 13,69°, I think we can conclude that it is not a good idea to use the plans from Winter's book to make a model of a Dutch warship of the 1660s. The actual Dutch warship of the 1660s were much flatter than the plans of the Hohenzollern-model from Heinrich Winter's book show us.
R.
In a thread where the plans of the Hohenzollern-model from Heinrich Winter's book were presented as representing a Dutch warship of 1664, I posted this drawing:
In red the mainframe of a Dutch warship of 1703, in blue the mainframe of a Dutch warship of 1664. I hope it is clear from this drawing that the mainframe of the Dutch warship of 1664 is very flat.
Then I did some more research into the shape of the mainframe of the Hohenzollern-model which I would like to share here.
(Beware! The drawing above was made in the conventional way: the contours show the outside of the mainframes. Since Heinrich Winter measured the Hohenzollern-model on the outside of the hull, and not on the outside of the frames, all four following drawings show the contours of the outside of the hull of the Hohenzollern-model.)
The flatness of the Dutch warship of 1664 we see in the drawing above, we do not see in the plans of the Hohenzollern-model from Heinrich Winter's book. In the plans from the book we see a mainframe that is not flat at all. Here is that mainframe:
In red I added a rising line that starts where the planking touches the keel and that is tangent to the contour of the planking of the mainframe. This rising line is at an angle of 13,73° with the horizontal.
I drew this rising line because we can find a similar rising line on a drawing that was made before the plans in Winter's book were made. Here is that preliminary drawing:
The rising line I mentioned is marked with 'Anstieg' and I marked it in green. This rising line is at an angle of 9,80° with the horizontal.
So the green rising line on this preliminary drawing is at a much smaller angle with the horizontal than the red rising line from the plan from the book.
Please note that the preliminary drawing also shows the values Winter noted when measuring the Hohenzollern-model. These values show that Winter only took measurements three station lines down from the waterline 'WL', he did not take measurements from the bottom of the model. The only measurement he took from the bottom was the rising line marked 'Anstieg' and the distance from the keel where this rising line touched the outside planking at the position of the mainframe of the model. He gives a value of 'ca 14 cm' for this distance.
That the angle of the green rising line on the preliminary drawing is not just a simple drawing mistake, can be seen on a second preliminary drawing that shows a similar rising line. Here is that second preliminary drawing:
I marked the rising line on this preliminary drawing in blue. This rising line is at an angle of 9,32° with the horizontal. Since this second preliminary drawing is a bit deformed, I think we can say that the two preliminary drawings show approximately the same rising line angle.
A drawing like the second preliminary drawing can also be found on one of the plans from Winter's book; on 'Tafel IV'. Here it is:
I drew a rising line in magenta this time. As you can see it is at an angle of 13,69° with the horizontal, and therefore confirms the angle of 13,73° of the red rising line on the other plan from Winter's book.
I think we can conclude from this that something went wrong when the preliminary drawings were transformed into the plans from Winter's book. The preliminary drawings show a much flatter mainframe than the plans from Winter's book. So the plans from Winter's book probably do not show the shape of the hull of the Hohenzollern-model.
When we add this problem to the other problems we can find in the plans from Winter's book, wrong shape of the transom, wrong gun port positions etcetera, I think we have to conclude that it is impossible to retreive the shape of the hull of the Hohenzollern-model by using the plans from Winter's book.
Now let's compare the angles of the rising lines that we found on the preliminary drawings, 9,80° and 9,32°, and the angles of the rising lines we found on the plans from Winter's book, 13,73° and 13,69°, with the angles of rising lines we can draw based on information from two contracts for Dutch warships of 1664.
Here is the rising line of the 'blue ship' of 140 feet of the first drawing above. Drawn on the outside of the planking, like on the plans from Winter's book:
As you can see the rising line for this Dutch warship of 1664 is at an angle of 5,74° with the horizontal.
And here is the rising line for a Dutch warship of 160 feet of 1664:
The rising line for this Dutch warship of 1664 is at an angle of 6,45° with the horizontal.
So the rising line angles of the actual Dutch warships of 1664 are much smaller than the rising line angles on the preliminary drawings, which are much smaller than the rising line angles on the plans from Winter's book. When we compare the rising line angles of the actual Dutch warships of 1664, 5,74° and 6,45°, with the rising line angles on the plans from Winter's book, 13,73° and 13,69°, I think we can conclude that it is not a good idea to use the plans from Winter's book to make a model of a Dutch warship of the 1660s. The actual Dutch warship of the 1660s were much flatter than the plans of the Hohenzollern-model from Heinrich Winter's book show us.
R.