Hello all,
The stern printed parts have required ongoing filling and sanding. The parts are slowly looking smoother and more consistent. I haven't done too much further from last week and have spend a bit of time thinking about how to design the interface for these parts as they connect to the hull. In the meantime I have given some thought to the stern and fore hydroplanes, most notably the forward planes. The drawings show some inconsistency with different plan sections showing slight difference in their position horizontally along the hull. As best i can see it these planes are mounted just behind the forward torpedo tubes. I have therefore decided to take a position mirroring that. The planes feature a guard that sticks out just in front of the plane and extends back until it connects the furthest outer extension of the plane pivot shaft. These guards I assumed are to stop mine cables getting stuck and making the cable ride around the plane and then down the hull.
I could have made these parts with a 3D print file. I have actually modelled these parts but decided to go with a Renshape made component anyway. So I cut a thin strip of Renshape and then finely sanded it to the right profile. I then used it to create a template and marked out the outline to cut another. Once thsi was done I then cut out the second plane and then sanded it to mirror the first.
It is interesting looking at a fore plane design that is 100 years old. I wonder how effective long thin narrow planes are. I realize that the designers probably contended with narrow planes being better at dealing with mine cables. I presume that they had very little data to go on as submarines were so new. I wonder if they did any tank testing for hydrodynamics in 1912.
The next step was to drill a 2 mm hole at the pivot point . Fine sanding and making sure that the pivot holes are in exactly the same position.
So I marked out a position along the length of the hull. Found a vertical position and marked it. Then found a horizontal position and then marked that too. I had to carefully drill a either side of the hull in the same spot so that the brass rod would come out at the exact opposite point on the other side.
I have positioned the planes lower than the torpedo tube doors and further back. I have to also think about where the transition point occurs in the Z cut. So the top and bottom hull will be separated vertically just in front of where the planes will be.
I have increased the rake of the planes and angles the inner edges outwards as they head out either direction from the pivot point. The reason for this is that the hull curves up and without this rake then as the plane moves upwards or downwards it will close the distance between the inner surface and the side of the hull and scraping will occur.
More next week.
Dave h
The stern printed parts have required ongoing filling and sanding. The parts are slowly looking smoother and more consistent. I haven't done too much further from last week and have spend a bit of time thinking about how to design the interface for these parts as they connect to the hull. In the meantime I have given some thought to the stern and fore hydroplanes, most notably the forward planes. The drawings show some inconsistency with different plan sections showing slight difference in their position horizontally along the hull. As best i can see it these planes are mounted just behind the forward torpedo tubes. I have therefore decided to take a position mirroring that. The planes feature a guard that sticks out just in front of the plane and extends back until it connects the furthest outer extension of the plane pivot shaft. These guards I assumed are to stop mine cables getting stuck and making the cable ride around the plane and then down the hull.
I could have made these parts with a 3D print file. I have actually modelled these parts but decided to go with a Renshape made component anyway. So I cut a thin strip of Renshape and then finely sanded it to the right profile. I then used it to create a template and marked out the outline to cut another. Once thsi was done I then cut out the second plane and then sanded it to mirror the first.
It is interesting looking at a fore plane design that is 100 years old. I wonder how effective long thin narrow planes are. I realize that the designers probably contended with narrow planes being better at dealing with mine cables. I presume that they had very little data to go on as submarines were so new. I wonder if they did any tank testing for hydrodynamics in 1912.
The next step was to drill a 2 mm hole at the pivot point . Fine sanding and making sure that the pivot holes are in exactly the same position.
So I marked out a position along the length of the hull. Found a vertical position and marked it. Then found a horizontal position and then marked that too. I had to carefully drill a either side of the hull in the same spot so that the brass rod would come out at the exact opposite point on the other side.
I have positioned the planes lower than the torpedo tube doors and further back. I have to also think about where the transition point occurs in the Z cut. So the top and bottom hull will be separated vertically just in front of where the planes will be.
I have increased the rake of the planes and angles the inner edges outwards as they head out either direction from the pivot point. The reason for this is that the hull curves up and without this rake then as the plane moves upwards or downwards it will close the distance between the inner surface and the side of the hull and scraping will occur.
More next week.
Dave h
Comment