From the information and help gained from the “Fibreglassing a Hull” post, I had several options that I could use.
One option was to build a hull planked with 3mm balsa and fibreglass. I have seen this before on a Freemantle Class Patrol Boat and was ideal for that shape hull and I also intend to use the same method much later when I plan to build the same boat.
Second Option was to build a balsa plug, create a mould and make a hull from fibreglass. This was a smashing idea but the problems would be great. As on the Mk 1 hull, I had problems just trying to get the correct shape of the hull and had never fibreglassed before.
Third Option was to build a hull using the Double Diagonal Planking method, then fibreglass over the lot. It didn’t take too long for me to realize what ever method I used that fibreglass was always a part of the process. Oh well, looks like I am going to have to learn how to use this stuff after all.
I opted for the Double Diagonal Planking method-strong; light weight and looks like a good challenge but most importantly – fun to try out.
Now that I have an accurate set of plans and the method of skinning the hull, I set out making formers and keel once again of 8mm ply. I used ½” or 12mm square softwood doublers that traveled the full length of the internal keel so the planks may be glued to. The intermediate and deck chines were also made from ½’ or 12mm softwood.
Now that I am going to plank this hull, I needed to install intermediate stringers to help support the planks and keep the correct shape of the hull. As with the Mk 1 hull, I decided to use block balsa to make up the bow area, that is, from the very front to the first former and sand down to the correct shape.
You would think that after all the mishaps I made on the first hull, I would not make the same mistake again – WRONG…I did it again, I sanded the balsa blocks down to the former and did not allow for the thickness of the planks…
Martin the keen modeler