HMS Echo by Hamilton - 1:48 - Admiralty Models - cross-section

[hamilton]

Thanks OC

 

Christian - I'm not sure...but I suppose I'll find out...and I'll try to be conscious of this as I go....thanks!

hamilton

[hamilton]

A small update - not much time this past week for modelling, unfortunately, but I have a short break from work over the weekend, so hopefully I'll be able to make some progress. Today, I spent a very short time putting together a simple jig for taking vertical measurements - it's just the profile drawing adhered to a piece of 3/4" plywood with a batten clamped along the line marking the bottom of the keel. I made some tick strips out of card, but I think I will take a different approach to transferring these marks - I have a number of right angle plates that I made from 1/8" acrylic some time ago and the taller of these can be used to transfer vertical measures to the model - instead of using tick strips on the drawing, I will use 1/4" masking tape which can then be fixed to the right angle plate itself - perhaps a more stable way of transferring the measures, but we'll see how it goes - I'm going to try to mark and file out the notches for the sweep port sills and lintels this weekend using this method. 

hamilton

[allanyed]

Your idea of using a stiffer material is a great idea.  I have used my machinist squares similar to your use of right angle acrylic plates.  Looking forward to your progress.

Allan

[hamilton]

Thanks Alan - yes, this seemed like a much better approach than trying to line up tick strips. It'll be a little tricky as the model progresses, and I may need to modify the framing squares to allow me to continue using this method as I work aft - the framing square that I built from the Admiralty templates is too wide for me to be able to slide the acrylic squares in back of the frame for transferring marks. I'll see if I can puzzle this out over the weekend as I try to get my first frame raised. One thing I will definitely need to do is mark out the station lines as verticals on both the disposition of frame and profile drawings, so I'm sure I'm correctly laying the tape strips. This wasn't necessary for the deadflat frame as there is a little reference for it on the drawing itself, but it will be much better to mark them all out as verticals to ensure the reference lines are correct.

 

In the meantime, I spent a bit of time last night testing the method and seeing if I could set up the deadflat frame with accuracy. Using the vertical measurement jig and some 1/2" masking tape (turned out I didn't have any more 1/4" stuff, which I think would be better), I took measures for the upper & lower deck beams at side, the height of breadth line and the design waterline. I then just peeled this tape off the jig and carefully lined it up with the edges of the square at the bottom and along one side - repeated for the port side square and that was that. The port and starboard squares were lined up with the height of breadth line on the drawing fixed to the building board and then clamped in place.

 

In the photos below, I've set the frame up and clamped the fore and aft framing squares and the lateral squares. I found it useful then to take a tick strip with the lines marked out and used this to test the port & starboard symmetry of the frame  and make minor adjustments to its positioning before final clamping. What you see in the final shots below is the frame set up on the building board ready to be marked out for the various lines noted above. The deadflat 1 frame needs also to be marked out for the sweep port notches on its aft face. In fact there are, I think, only 4 frames total that don't need to be notched out for sweep ports, gun ports and/or scuppers.

 

A brief observation - the process of constructing frames has really re-oriented my focus and attention in modelling. The necessity to approach each component with care and thought for its relations is so much more on the surface of things than I've experience in my work on model kits, where I feel like I lag in conscientiousness here and there where the kit manufacturer has done the work for me....Even with my scratch Bluenose there were a couple of "auto-pilot" moments where I was leaning much more on the documentation supplied by MS for their kit, and where I felt I could fudge things without any overall bad effect. Here, there's no fudging things! It has to be right or it's not going to work - it's a lot of pressure, but it feels like there's a lot of learning happening too, which is fun.

 

Here are some photos - I hope to have the first frame raised by the end of the weekend - I just need to mark it out, trunnel the joints, work on the keel notch to ease the fit, and it'll be ready to go......deep breath....

hamilton

Edited May 17 by hamilton

[hamilton]

One last update for today. I used the markings on the tape strips attached to the right angle plates to mark out the lines on the front face of the deadflat frame. I then cut a tick strip and marked the lines on it from the profile drawing and checked against the marks on the frame. With a very small adjustment on the starboard side, the markings were nice, even & symmetrical. I then unclamped the frame and extended these marks across the face of the frame using a straight edge, and then extended the lines around the frame, so each line is marked out on all sides.

 

I still need to add trunnels to the futtock joints, which should be interesting - the joints are such a tender spot that I'm not sure how to approach it in terms of supporting the frame so it doesn't break under even the controllable pressure of hand drilling....My current idea is to put the frame in my bench vice so the outside edge of the frame is just above the jaws and going for it from there....I have some cast-off futtocks that i made while practicing my scroll saw work so I might just glue up a couple of those just to see how it feels and how it goes....I guess I'm not in any rush!

hamilton

Edited May 18 by hamilton

[hamilton]

So I may have been pre-emptive, but I decided to raise the deadflat frame on the keel today. Doing so took quite a bit of finessing and was definitely aided by the deadflat 1 frame when it came to final positioning.

 

The whole endeavour was slowed by the fact that I broke not one but both of the frames while adding the trunnels, and had to reset the futtocks and in one case re-make one of the chocks - which I did using the method suggested by Greg which worked way better for fit - still a bit of adjusting to do, but not as much as when I was just cutting them from the patterns on the frame drawings....

 

For mounting, the frame was merely glued to the keel assembly with PVA, which I will let cure for 24 hours before securing the seating with a length of brass rod - this will be invisible under the keelson, so I'm not going to treat it in any way, just use it for structural support.

 

I lined up the frame along the reference lines on the lateral framing squares and clamped these in place. I then clamped the forward square along the centre line (I etched a centre line on the acrylic base and vertical support for certainty)and then clamped the frame to the aft framing square.

 

Once this was done, I inserted some 2mm spacers (scrap basswood) between the two frames and used a length of 2mm basswood for a bracing piece at the top. This is only glued to the aft edge of the deadflat frame but clamped between the 2 frames to secure it. I was quite please not only with the seating of the frame, but with the alignment of the outside edges of these first two frames. I will be adding these horizontal braces to the tops of the frames as I go for structural support and to ensure symmetry and will saw the centre portions flush and sand down the remaining material flush with the frames when I fair the cross-section for planking. The bracing pieces you see further down the frame are not glued and will be removed once the glue is set and I'm ready to install deadflat 1, which I will do after completing frame 1 forward.

 

Any comments, tips or feedback on this process are always appreciated. Thanks and bye for now

hamilton 

[hamilton]

A final update - deadflat 1 has now also been raised, after notching it out on the aft face for the sweep port sills. Here are a couple of shots to round out the set....moving on to frame set 1 next....think I will continue to do these in pairs as long as that continues to make sense....

hamilton

[druxey]

All looks fair and square!

[hamilton]

Thanks Druxey! We'll see how the rest of them go......frame 1 F/A is on the go now and hope to finish on the weekend....been fun so far

hamilton