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    Scratch Built 31" 'Blue Moppie'
    by EdH πŸ‡ΊπŸ‡Έ ( Midshipman)
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    πŸ“ Scratch Built 31" 'Blue Moppie'
    19 hours ago by EdH ( Midshipman)
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    My grandson’s β€˜Blue Moppie’ is progressing. The toe rail and rub rail were added to the hull (some interesting bending challenges), but most work was on the superstructure. As in past models, I wanted the whole thing to come off in one piece, but knowing how this model will be driven, the seal has to be perfect. The cabin side and coaming was a three piece laminate to fit over the the raised edge around the opening and because the locking device would be in the center, the whole superstructure was built very slightly flatter than the deck, so when dogged down there is a lot of pressure all around the seal. The fitting I used has a tapered entry so is easy to line up when replacing the top. The fit is tight, so because the real Moppie has a rail in front of the driver, I made it strong enough to pull on. I bent a piece of solid brass rod and threaded the ends, so it bolts to the plywood base. It would be nice to also have another handhold in the front, but I can't think of anything that looks like it would belong. Suggestions? The knob used to lock the superstructure down will be black and hopefully look like an RDF or compass in the wrong place? Because any cockpit will fill with spray, I am putting a a tarpaulin over the center cockpit (one photograph shows one rolled up) and the driving cockpit will have to be a black pit. The crew will have to be cut off at the knees. The top half of the steering wheel is in. As before, the last picture is the real β€˜Blue Moppie’.
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    πŸ“ Scratch Built 31" 'Blue Moppie'
    9 days ago by EdH ( Midshipman)
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    Work continues on my grandson’s scratch built β€˜Blue Moppie’. The motor, shaft, rudder etc were removed and short pieces of shaft were put in all the openings as dust shields. Because of the extreme curves, the chine and toe rail were laminated. The topsides and hull were a challenge as the sheet of 1/16” Bass not only had to curve top to bottom, but also bend sharply towards the bow, something a flat sheet of wood does not want to do! The thin Bass would split if I used individual clamps, so I made a jig to hold the frames securely, then bent two lengths of 3/8” x 3/8” fir across the frames, clamped to the jig. This way the load was spread out. It took a lot of pressure to bend the fir this sharply, but nothing split and the frames held together. With the hull flare, the toe rail did not come to a point at the bow, but was one continuous curve at deck level. Even using three thin laminates of 1/16 x 1/4 it was a stretch. Blue Moppie actually had more of a point than the Black Watch 30 I had the line drawings for, so I could have saved myself some trouble. Many people modeling this type of highly flared bow use a solid piece carved and sanded to shape, but I wanted to try to bring the sheet all the way to the stem and still keep the curves. Next I put the lift rails on the hull, which of course was what helped the early Ray Hunt designs do so well offshore. I used 1/8" x 1/8” Bass, which again involved some hefty bending. The later Ray Hunt designs had less of a curve at the bow, which again would have easier. Once firmly attached, they were sanded to their triangular cross section. Much more sanding to do, but the hull is taking shape. I included a picture of the real Blue Moppie as a reminder.
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    9 days ago by EdH ( Midshipman)
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    Chris, the flare was indeed a challenge. In the first third of the hull, the bulkheads are 1 1/4" apart and the remainder are 2 1/2", plus each bulkhead is 1/8" thick. This was not a problem as I'm not doing the interior and it did make following the curves a lot more accurate.

    I did a dry run for each sheet, clamping the fir strips as hard as I dared, then leaving them overnight with wet paper towel over both the strips and sheet. Next day I cinched them all the way in and again left them all day, soaking. When I eventually glued them, they had taken on a shape, but still required a lot of pressure.

    I normally fiberglass my hulls, but I'm trying to keep the weight down as my grandson wants something really fast. It weighs very little, which will restrict it to flat calm days, but it should fly, hopefully in a straight line. My Black Watch 30 model, which has the same lines, is a heavy boat with lots of twin engine power (picture), but is absolutely controllable at way over scale speed, so the hull is proven. I put some power into the RAF Crash Tender and this gets unstable with too much throttle, at much lower speeds than the BW30. I've heard the same with models of older hull designs like the tenders and PT boats
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    9 days ago by ChrisF ( Midshipman)
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    Could be one of my Fairey hulls! Which do of course have links.

    I know what you mean about the flare, had a right game with my Huntsman 31. Used thin birch ply and had to slit it and fill with P38 to get a smooth curve. If doing again would use more formers like you have.

    Your build is coming along well and looks great.

    Chris
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    πŸ“ Scratch Built 31" 'Blue Moppie'
    27 days ago by EdH ( Midshipman)
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    I’ve started the model my youngest grandson asked for. He wanted something similar to my 30” Huntress model (green boat pic) but he felt there was no need to go into this detail. For me it's more interesting to build an actual boat, so I had the idea of building the famous Bertram β€˜Blue Moppie’, which with all her racing success, put designer Ray Hunt’s Deep V hull firmly on the map and radically changed powerboat design. She had a Bertram 31 hull which is almost identical to β€˜Huntresses' Ray Hunt Deep V, for which I still had the line drawings, so it was a no brainer. If I put a tarpaulin over the center cockpit, the whole boat is essentially almost flush decked, with no places for water to collect. I will have to think up two figures in the back! As usual I put the whole drive train in before even adding bulkheads, as I find it so much easier to get the shaft straight and the motor accurately lined up. The keel is two halves, with routered groves in each side to take the shaft and rudder casings. By loosening the four motor mount screws, everything except the shaft casing can be removed during the build, but it's easy to re-install, with everything already lined up, once painting etc is done. My grandson wants this to blow every other boat out of the water, so instead of fiberglassing the hull as normal, I’m painting the wood directly to save weight. He’s going to have to understand that any accidents will cause quite a bit of damage, but I guess that if I built it, I can rebuild it, at least if I have some parts salvaged!
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    23 days ago by jbkiwi ( Fleet Admiral)
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    I watched your build, very nice job

    JB
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    24 days ago by Madwelshman ( Midshipman)
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    If you send me a private message with your email address, I will see if I can find the plan that I have and send it to you.

    Will
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    24 days ago by pressonreguardless ( Commander)
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    Great Video Ed!
    Thanks for sharing.
    Trev
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    24 days ago by EdH ( Midshipman)
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    Madwelshman, I only currently have rather blurred photographs of Blue Moppie's superstructure, so there may be a bit of β€˜interpretation’. The hull is fine as I’ve got accurate line drawings of the Black Watch, which is so similar. If anyone has drawings or an aerial shot from roughly above they would be appreciated!
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    24 days ago by EdH ( Midshipman)
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    ChrisF, I would use this method again, especially for difficult curves. I essentially built the boat from the inside out, so no foam was visible when the cabin top was removed. You have to paint the foam when sanded to avoid issues with the resin
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    24 days ago by Madwelshman ( Midshipman)
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    The Moppie boats are quite famous in the offshore world aren't they.
    Great to see a slightly more unusual boat/lesser seen boat being built.
    I think I have plans, including top sides for 'Brave Moppie'.
    There were 5 versions of boat all sharing the same hull, just with different superstructure, Huntress and Brave Moppie being two of them.

    Will be following the build with interest.

    Will
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    25 days ago by ChrisF ( Midshipman)
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    I've seen foam blocks being used but not spray foam. But you've made it work well and ended up with a nice model. With inbuilt buoyancy as well!
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    25 days ago by EdH ( Midshipman)
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    The bow is very similar in the two boats and not easy to replicate with full sheets of wood, even with many bulkheads and 1/16" Bass. The next post will show the result!
    I used a totally different method on 'Huntress', the sister ship model. I sprayed expanding foam between the bulkheads, sanded it to shape, then fiberglassed the whole thing, using very fine cloth. No problem with curves this way!
    Incidentally in the real boat the extreme flair really works. I have been caught in some heavy seas off the Maine Coast and the flair just powers the waves aside.
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    25 days ago by ChrisF ( Midshipman)
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    It has got some curves hasn't it! I used some thin ply in the bow area of my Huntsman 31 which has pronounced flare. I still had to slit the ply and use some P38 filler to get a smooth curve. I haven't got as many formers as you have though and if building the hull again would add more.

    Interesting history about your Black Watch 30 and it's links with Fairey. I'm building 5 at the moment and 2 more in the pipeline.

    Thanks for the link to the Cowes-Torquay race. I've watched the 1969 Round Britain a few times and picked up a copy of the original book.
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    26 days ago by EdH ( Midshipman)
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    Thanks ChrisF. The frames are all Bass wood so everything is still very light. The hull will be 1/16" as there are some horrendous curves, but I'm hoping with all those bulkheads and the many lift strakes running the full length, that this hull has, it will be strong enough.
    My Huntress is a 1" to 1' model of our Black Watch 30, built in 1989 by Ted Hood at Little Harbor. It was designed by Ray Hunt, who of course had a hand in designing the original Fairey boats. The Bertram 31 hull, which he did later and was so revolutionary in the industry, is the same deep V, but is somewhat different. The Black Watch has very similar lines to the Bertram 31, so although I'm cheating a bit, it's very close. I got the line drawings from Ted Hood's biography.
    I've had a lot of fun looking at clips from the 1962 Cowes to Torquay powerboat race which I remember following as a kid.
    https://www.youtube.com/watch?v=PJFs_aXid2Y
    Blue Moppie (#88) surprised everyone by coming in second to the Vosper built Tramontana, which was so much larger, with vastly more horsepower. There were a lot of Fairey Huntsmen in that race!
    Thanks for commenting.
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    26 days ago by ChrisF ( Midshipman)
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    Yep, I like to build some unusual models as well as the more common ones and yours is interesting.

    I don't think you need worry about saving weight by not glassing the hull when you have all those bulkheads/frames!

    Your Huntress is interesting as well. Was it adapted from the Fairey design?

    Chris
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    26 days ago by pressonreguardless ( Commander)
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    Great Looking Build, Looking forward to your progress, Ed
    Trev
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    26 days ago by EdH ( Midshipman)
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    Thanks jbkiwi. I try to do unusual scratch projects. The last one was 'Maid Rosalind', a 40" model of a Thames cruiser, a Windboats Fairwind built in the 1940s. I did a blog on it.
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    πŸ’¬ Re: Scratch Built 31" 'Blue Moppie'
    26 days ago by jbkiwi ( Fleet Admiral)
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    Interesting project Ed, nice to see something unusual being built, interested to see how it turns out.

    JB
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