Hi again,
Once more I'm coming back much later than I anticipated but I haven't been totally slacking– it's just that everything seems to have been taking longer than I thought and unfortunately, I haven't had the uninterrupted run at it that I had hoped.
Terry and Andy, thanks for your hints on firming the hinges. I had forgotten how sticky paint and grease can be and, whilst I haven't got to painting those sections yet, I'm sure it'll help.
I've been working on the last major structural element of the build – the bomb bay doors and of course they were trickier than I thought they would be. We'll start at the beginning.
Top of the photo are the parts to make the starboard door. Bottom is the assembled frame for the port door. Apart from the framework, two metal end pieces are supplied and a center metal rib. These will support working hinges that are unlike anything on the actual aircraft. Also in the picture are the cylinder door jacks that should allow the doors to open and close to some degree, when fitted.
The original skinning scheme, envisioned by the magazine, is to skin the doors in individual panels, inside and out.
Here is the metal sheet and template supplied. I did experiment with the first and second panels but it is so difficult, even on the outer skins, to get them to curve to the same degree, that there would be gaps to fill between every panel. Add to this the extra drying time for each panel before its neighbour could be positioned, that I thought that there must be an easier – and quicker – method.
Here is my solution. Each door is 30cm in length, approx.
I couldn't see why this couldn't be achieved by using just two panels. After some experimenting with tracing paper and light card I felt brave enough to cut the metal sheet to join at the centre metal rib. This was then riveted and shaped to fit the convex shape of the door frame. The above shows a first test fit and the type of clamping required to keep the skin following the shape of the frame when setting.
After only a coat of primer to the frame (it won't be visible when fully skinned) the first section was attached with contact adhesive and left overnight to dry. Before this though, the panel lines had been scribed to match the positions of the ribs. (On the actual aircraft there are two intermediate formers between each rib, hence the additional rivet lines.) The second panel was then adjusted to fit and left overnight to set.
The next task was to skin the inner door surfaces. This created its own problems as the inner doors consist of a distinctive shape of double concave panels, top and bottom.
Because of this unique shape I found that the metal sheet was to thick to bend to get a tight contour with the ribs. I experimented with .25 plastic card and found that, with plenty of clamping, the card fitted the contours much better.
Here the left panel has been attached, left overnight and most of the clamps now removed. The right panel is undergoing the same process and you can see the amount of clamps needed to get the correct shape when setting. Both sections had been riveted and panel lines scribed before attaching.
Here, the finished door has had a reinforcing strip (chrome tape) added between the top and bottom sections.
I am currently working on the starboard door but that shouldn't take as long as I have worked out most of the problems on the first one.
I'll wait until both are completed before final painting. It's now my intention to continue working on the bomb bay and bomb load before attaching the doors and complete this section before moving on to other aspects of the build.
I will keep you posted as progress is made.
Gerry