1/24 RAF 68Ft Vosper RTTL

Started by peterbro

28 updates 175 likes 32 comments
peterbro Opening post 41

1/24 RAF 68Ft Vosper RTTL

This will be my first boat build at this scale, so who knows how it will turn out.

I got a set of Vic Smeed's plans from Sarik Hobbies along with their wood packs for the model - I thought having some laser cut parts might be helpful.

I grew up in Alness, so if the build goes well I'll probably paint it as 2757 which was based at 1100 MCU Alness/Invergordon in the late 1950's to early 1960's.
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1 comment
  1. B rian J ames
    Petty Officer 2nd Class
    Well done U , keep extending U're self with new types of builds. Keep up the fantastic work, & please sent pics if when available. 'B J'.👍 🤞. Someone, Chuggalong? mentioned 'Cindy' a 'push' tug! Have U ever 'pushed', a 'pull' door? The 'other' push! How much does 'free' time cost? 🤔 Theep Dinking again? 'B J'.(wrong spell. intentionally).
    Liked by peterbro and Peejay and

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Making up the keel

The keel came laser cut with the Sarik Hobbies wood pack, along with some 1/8" square strips and 1/8" ply planks to be glued on either side.

Looking at the plan and laser cut bulkheads, the 1/8" planks should have been 1/4", so I've added a couple more 1/8" ply planks to the rear of the keel to make it the right size.

I got some V slot aluminium extrusion from Amazon to use as a jig for building the hull on. I've no idea how well this will work, but time will tell...
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3 comments
  1. Ceedee
    Recruit
    Hi there, I just bought the same kit from Sarik and it arrived yesterday. I remember there was a similar vessel at Portpatrick Harbour late 60's early 70's.So I look forward to keeping up with your progress and any tips. Cheers

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Adding some bulkheads

Even though the bulkheads came laser cut in the wood pack, I wasn't too sure about the positioning of the front No1 bulkhead, so started with No2 & 3 instead.

It took a while to work out how to use some v slot aluminium to make a framework that would keep the bulkheads vertical and perpendicular to the keel, but I think I found something that works.
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6 comments
  1. ChrisF
    Vice Admiral
    Always a good idea to put some holes through the bulkheads before assembly whilst it's nice and easy. As Ronald says a Forstner bit makes a nice neat hole - I have a set of different sizes for that.

    Even if you don't use the holes it takes a bit of weight out of the frames.
    Liked by hermank and Peejay and
  2. AlessandroSPQR
    Fleet Admiral
    Hi Peterbro, you have found an excellent solution to align the frames well on the keel.

    I completely agree with ChrisF.
    I also designed and then made a series of holes (square and round) aligned on the frames, as well as many openings. I passed through the holes: fixed wooden spars (to reinforce the structure and create supports for electronic setups and other); removable wooden spars (for central alignment check); electrical cables (since they were heavy they were placed at the bottom).
    Liked by hermank and Peejay and

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Remaining vertical bulkheads added

Added bulkheads 1, 4 & 5 today.
I cutout the centres of 4 and 5 before attaching them to the keel using a circular saw blade on the flexible attachment to my mini table saw - not a bad result for my first time using it.
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Stern bulkhead (No6) added

I didn't do this one yesterday because it isn't perpendicular to the waterline (and therefore the other bulkheads) and also didn't fit without some modification.
A few more Amazon purchases to get moveable extrusion joints and much fiddling later and it is in place.

In addition to getting the fixing angle right, it took longer because despite both the bulkhead and keel being laser cut items from the Sarik short kit they don't fit together.

The bulkhead comes with a 1/8" keel slot, but the keel is 3/8" wide at that point, despite being 1/4" narrower than the keel design on the plan.
It looks like the central 1/8" keel section is the only one that should be full length, to give a 1/8" tab for the bulkhead, but all 3 laser cut keel parts are identical in the kit.

I guess if I'd noticed before laminating the keel sections I could have done something about it. I didn't though, so had to widen the keel slot in the bulkhead instead.

I also found that the deck height was too low when dry fitting, which prompted much height, level and angle measuring.

Oddly, the bulkhead is exactly the same size as the one in the plan and the angle I had was also pretty much spot on - it just sat noticeably low on the keel compared to the deck level of the other bulkheads, which isn't the way it looks on the plan.

I eventually decided to add 1/8" shim to the slot in the bulkhead to raise it up to approximately the same height as the other bulkheads. The slots for the chine also line up reasonably well visually with the shim in place, so hopefully it was the right thing to do.
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More hull progress.

A relatively easy job today.

I added the 1/8" carlings that join all the bulkheads together at deck level and the engine room sides that are located immediately inboard of the carlings between bulkheads 4 & 5.
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Chine Laminations Added

The chines are made from 3 laminated 1/4"x1/8" strips on each side.
I added one layer at a time over three days, using lots of 1" bulldog clips to clamp everything down.

The strips between bulkheads 1 & 2 are bent inwards and upwards. This was my first go at plank bending and I improvised a tool out of some pulley wheels mounted to some V slot aluminium to try and get something consistent.

Bending the height of the strips distorted them slightly, but I don't think that will matter in the end since they will have to be carved down to the bulkheads later anyway.
Liked by Wolle and premecekcz and

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Extending the Keel at the Bow

The keel from the Sarik semi kit stops at the level of the chines near the bow so some work is required to build it up to full height. The plan is a bit hazy on exactly what the full height is (which may be why Sarik stopped short). I've tried to make it level with the inwales at bulkhead No1.

I also decided to make a former for the curve of the inwales between the bow and bulkhead No1 to increase the chances of getting something symmetrical.

For both of these tasks I scanned parts of the plan and imported them into Adobe Illustrator to get something that could be scaled and printed accurately.
Once printed I stuck the shapes onto some 1/8" ply, cut them out and then glued them in place.
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Inwale Laminations Added

The inwales are made from 3 1/8"x1/4" strips laminated together.
Unlike the chines they run the full length of the boat.

The bow sections involve much more curvature than the chines did, so I soaked each strip in boiling water before bending - this seemed to work, as none of them broke.

The bow former allowed each strip to be clamped to what I hope will be a symmetrical curve.

The next stage will be to trim the chines and inwales back to the bulkhead shapes.
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peterbro #10 of 29 41

Weekend Progress

This weekend I planed and sanded the chine and inwale laminations down to the shapes of the bulkheads ready for the hull skin to be added.

Since the bulkheads in the semi kit have the more accurate curved shapes from the plan I'm going to try planking rather than shape ply sheet to composite curves.
To make that a little easier I added more formers at the bow ahead of bulkhead 1 at the level of the chine line.

My current plan is to add the hull skin over the former before adding the solid bow block from the plan. Hopefully that will mean I'll know the exact shape required for the block.
Liked by EdW and Wolle and
2 comments
  1. peterbro
    Chief Petty Officer 2nd Class
    It's a load of v-slot aluminium parts that I found on Amazon.
    It seems to have worked pretty well so far, but if I were starting again I'd go for base plates with an odd number of slots to allow the jig to be more symmetrical.

    With the 4 slot base that I used the keel is offset and the bulkhead supports aren't the same size, which makes things look a bit odd even when they aren't.
    Liked by hermank

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