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    MTGMB
    7 Posts ยท 3 Followers ยท 14 Photos ยท 27 Likes
    Began 11 years ago by
    Petty Officer 2nd Class
    United Kingdom
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    Latest Post 23 days ago by
    Petty Officer 2nd Class
    United Kingdom
    Most recent posts shown first   (Show Oldest First) (Print Booklet)
    ๐Ÿ“ Re-start.
    23 days ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 15 Views ยท 5 Likes
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    ๐Ÿ’ฌ Add Comment
    Ooh look, 9 years later I'm doing a bit more, it's sat on the top of various wardrobes over the years but now it's back. There's a 2mm deck and some superstructure and even some possible Sterodent torpedo tubes....the hull was done, motor mounts and propshaft all in. I'll nick the radio out of my MK2 Fireboat, it rarely runs anyway. I did find an Iranian Navy gun/missile boat the other day, add a torpedo or two and perhaps this isn't such an OTT concept after all!

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    ๐Ÿ“ MTGMB
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 4 Likes
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    ๐Ÿ’ฌ Add Comment
    Easier to form lower skins than I thought, laminating from the 32thou helped a lot.

    ๐Ÿ“ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 20 Views ยท 2 Likes ยท 12 Comments
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    ๐Ÿ’ฌ Add Comment
    After a long pause I am as far as propshaft, motor and rudder installation. I need a servo next but spent all my pocket money climbing a mountain in Wales this month. it was good but wet.
    The motor lives on the usual alloy bracket, screwed to two wooden plinths made from strip laminated with araldite. it's all standard stuff but making it this way allowed me to shim the height correctly, the strip being about 1.5mm thick. I'll post some pics if I can work out the Google drive thing but you will also see that the lower skins are on and after the servo installation I can think about the upper hull skins and then the superstructure. All good stuff๐Ÿ˜€.

    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฉ๐Ÿ‡ช RNinMunich ( Fleet Admiral)
    โœง 19 Views ยท 2 Likes
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    That's what it's apparently generally come to mean ๐Ÿ˜Ž
    What you describe is a Cardan Shaft or double Cardan joint!
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    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    That's interesting, didn't know that! Always thought it only became a cardan when a short shaft had a UJ at each end to to change the drive plane. Live and learn!๐Ÿ˜
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฉ๐Ÿ‡ช RNinMunich ( Fleet Admiral)
    โœง 19 Views ยท 1 Like
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    Hi,
    Strictly speaking the UJ is a Cardan link! Named after Jerome Cardan (Geronimo Cardano) โ€ 1576 italian mathematician, its inventor. ๐Ÿ˜‰
    Whatever!
    fid - if it feels good - do it! Main thing is to enjoy what you are doing. ๐Ÿ‘
    We all just wanted to help you avoid disappointment with the performance.๐Ÿ˜ญ
    Greetings also to Zdenek in Prague. He knows what he's doing folks!
    Check out some of the magnificent ships he has built - here
    http://www.inkoust.estranky.cz
    ๐Ÿ‘๐Ÿ‘๐Ÿ‘
    Cheers Doug ๐Ÿ˜Ž
    http://www.inkoust.estranky.cz
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    All getting involved now! I suspect it looks worse in the pictures because the prop thrust will definitely pass over the rudder although perhaps not ideally. And I don't have a cardan shaft, just a uj because as I said, simple appealled for a part time hobby as this is to me. My aim was to see if I could form the wooden hull like my Dad did on the fireboat cos I always admired the shape but of course I would like to finish the job eventually ๐Ÿ˜€
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    Ah well, thanks for that! I think you and Sonar are quite right, and no doubt better qualified to comment. Certainly the motor could be lower but I hesitated about moving it forward because of the weight distribution which I thought would be better at least halfway or more aft. As for prop sizes, again I am largely guessing what might work, on the fireboat I have a fifty mm z two blade which seems to work well without the motor getting hot but that has a slower, torquey motor, so smaller will probably be appropriate with the 750s. in truth I'll leave it as it is until I can trial it, probably a few years away, and if it is a disaster then I can still change it then๐Ÿ˜‰
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฉ๐Ÿ‡ช RNinMunich ( Fleet Admiral)
    โœง 21 Views ยท 3 Likes
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    I would say you've achieved your main objective magnificently ๐Ÿ‘ The hull is looking really good.
    But the shaft angle is maybe 3 times the optimum, based on looking at my Aerokits Sea Scout layout and Sonar's advice!
    Looks like there is plenty of scope in the hull to mount the motor further forward and much deeper and still be able to fit a pretty large prop. But bigger isn't always better!
    Not really my expertise but would guess with 50mm you risk overloading the motor!? I'm sure the experts here can advise you better on that than I.
    You may also find the boat more responsive to the rudder if the prop thrust is directed at the rudder instead of more below it as it seems to be now?
    Cheers Doug ๐Ÿ˜Ž
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    Mines a bit more than that! in all truth I am no a boat designer so I just look at things in a practical way and while I absolutely agree with what you are saying I also know the old fireboat works ok for me. The other thing I wonder is with a short, light at the bow boat and all the weight aft of the centre could the prop thrust tend to lift the whole boat as much as push the front down? Like I say, just thinking aloud rather than speaking from experience!
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡น๐Ÿ‡ณ none ( Chief Petty Officer 1st Class)
    โœง 19 Views ยท 1 Like
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    lower the motor mounting as close as you can to the bottom of the hull making sure the propellor does not touch the underside of the external hull if this makes sense
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡น๐Ÿ‡ณ none ( Chief Petty Officer 1st Class)
    โœง 19 Views ยท 1 Like
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    Or as close as possible depending on the shape of the hull
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡น๐Ÿ‡ณ none ( Chief Petty Officer 1st Class)
    โœง 19 Views ยท 1 Like
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    should be 8 to 10 degrees.
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    I would tend to agree! The more it pushes forward the better of course. But I largely copied my 36" fireboat and to get the prop dia options up to about 50mm it needs quite a angle. I didn't want to complicate the drive line either as my main interest was in forming the hull, just to see if I could really. I suppose the proof will be in the sailing!
    ๐Ÿ’ฌ Slowly does it.
    9 years ago by ๐Ÿ‡ฉ๐Ÿ‡ช RNinMunich ( Fleet Admiral)
    โœง 20 Views ยท 2 Likes
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    Hi, Prop shaft seems, to my eyes, to be at a very steep angle!
    Would have thought it reduces forward thrust and / or tends to push the bow down. is this normal for this type of boat?
    Maybe I'm just more used to displacement hulls, destroyers etc.
    Cheers Doug ๐Ÿ˜Ž
    ๐Ÿ“ I have done something, honest...
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 21 Views ยท 4 Likes ยท 2 Comments
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    ๐Ÿ’ฌ Add Comment
    Ought to say the skin here is just trial fitting, not gluing on, see comments below! Couple of pictures just to prove it really does exist! I am about to start on the lower skins but here you can see the stringers and bulkheads etc. The second to last one definitely did not get drawn wrong and need a modification, oh no. it isn't on the kitchen table when my wife was at work either.
    Bit concerned at the change of profile at the forward keel, not looking forward to that bit but will be able to re-profile it if need be as there is a lot of spare material there. I'm using 0.032" ply for the skins and will laminate to strengthen as required, not having done this before I am as usual guessing a bit. it seems to me easier to go with the more flexible materials rather that struggle with the thicker- how thick does the skin need to be? How does 2 plies of .032" with a layer of epoxy between them sound, I don't know, well stiff enough I would have thought on the high seas but generally abuse proof enough I am not so sure.

    ๐Ÿ’ฌ I have done something, honest...
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    HI thanks for the advice, I have been keeping it clamped down during any work and I agree totally, as the skins go on the risk gets worse! My double skins are going to be one on the outside and doublers between the bulkheads on the inside so should avoid some tension issues there. I am happy to see it coming together though!
    ๐Ÿ’ฌ I have done something, honest...
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง Dave M ( Vice Admiral)
    โœง 19 Views ยท 1 Like
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    Your build is progressing well. You really do need to attach the formers to a solid base or you run the risk of the hull distorting as you apply the side sheets. A length of 5/8 mdf would suffice with small uprights nailed to each former.
    The 1/32 wood will be fine and even stronger if you use two skins. You will really need to support the hull if you are double skinning at least until the glue has fully cured - 24hrs at least.
    Looking forward to seeing how you progress
    dave
    ๐Ÿ“ Merry Christmas
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 20 Views ยท 2 Likes ยท 1 Comment
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    I bet this was written off as another idea that got no further! I will pop some photos up soon but I have completed the main part of the hull minus skins, once I glue the last stringer on I will clean up what I have done and get the camera out. I have learned that bending 3/8" sq spruce around the deck profile is easier said than done and laminating in 1/8" strips is easy! I also found that warming said 1/8" sq strip is easy with a heat gun and less messy than steaming which is how I did the 3/8...said I hadn't built a boat before.

    ๐Ÿ’ฌ Merry Christmas
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง Deswelham ( Petty Officer 1st Class)
    โœง 19 Views ยท 1 Like
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    God idea about using thinner strips and laminating
    ๐Ÿ“ First steps
    11 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 23 Views ยท 6 Likes ยท 2 Comments
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    ๐Ÿ’ฌ Add Comment
    Been looking for a hobby for a while now to fill in the small amount of spare time I get and having (mostly) finished my Dads Aerokit 36" (detailed in another blog somewhere here) fire tender a mere 40 odd years after he began it, I decided to see if I could do the hard bit and build a hull myself rather than fitting out what he had already done. I do like to do things my own way though so decided to go from scratch rather than a kit. I can't list marine architect on my CV so I used the Aerokit hull to get a start for the dimensions then altered it all to suit what I thought would be best, especially the spacing between the bulkheads to allow for batteries and radio etc. The superstructure will be different to reflect the er, interesting weapons specification demanded by the 'customer'. Hopefully we will end up with a wooden hull around 880mm long by 255mm beam, powered by a Caldercraft CEM750S at 12v driving a single prop. I did want to go for a twin motor set-up but the extra cost didn't really justify itself to me.
    I have drawn full scale the plan and side elevation and the bulkheads which have now been photocopied full size. I cut the main keel section from 5mm ply and laminated it with two 9x9mm spruce sections using polyurethane adhesive. Despite clamping to a flat surface during the cure it still ended up a banana which is why I like to work with metal but never mind, I clamped it to a long radiator in the lounge (understanding wife required here) for a few days and it is now straight. I have pasted the plan views of the bulkheads to 3mm ply and will be fret sawing them over the next few days if time allows. That's about it so far.

    ๐Ÿ’ฌ First steps
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    Slowest reply ever? Sorry,just noticed this, perhaps by now you have the order?
    ๐Ÿ’ฌ First steps
    11 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง Pav403 ( Petty Officer 1st Class)
    โœง 19 Views ยท 1 Like
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    Good luck with the build, hopfully when my kids are old enough I'll get a simlar order for an all singing / dancing super destroyer ๐Ÿ˜€

    Regards

    Dave
    ๐Ÿ“ MTGMB
    11 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 22 Views ยท 4 Likes ยท 4 Comments
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    ๐Ÿ’ฌ Add Comment
    This the story, possibly to be a long drawn out one, of a scratch built wooden boat. Nominally for my six year old son, he has provided the spec for the armament, and as no amount of firepower is too much for a boy, he has asked for torpedoes, guns and missiles, hence the name!

    ๐Ÿ’ฌ MTGMB
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง DodgyGeezer ( Sub-Lieutenant)
    โœง 19 Views ยท 1 Like
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    "...designed for an 8 year old to be able to make themselves..."

    (so long as an adult cuts out the parts...)
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    ๐Ÿ’ฌ MTGMB
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง DodgyGeezer ( Sub-Lieutenant)
    โœง 19 Views ยท 1 Like
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    In that case you may be interested in this site, which has free plans for a 20" PT boat. The good things about it are:

    1 - it's simple to make, designed for an 8 year old to be able to make themselves
    2 - it's designed to be made in a bedroom, with few tools and little disturbance
    3 - it's cheap, materials about ยฃ5
    4 - it's realistic, so it will look good on the shelf
    5 - it's fast, with lots of guns....


    http://eezebilt.tk/PTBoat.html
    ๐Ÿ’ฌ MTGMB
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง fid2b ( Petty Officer 2nd Class)
    โœง 19 Views ยท 1 Like
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    I've no doubt he'd love it! if it goes bang, explodes or otherwise creates mayhem it's good for him...
    ๐Ÿ’ฌ MTGMB
    10 years ago by ๐Ÿ‡ฌ๐Ÿ‡ง DodgyGeezer ( Sub-Lieutenant)
    โœง 19 Views ยท 1 Like
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    He probably wants an 80ft Elco American PT boat.

    They had several machine guns, several cannon, torpedoes, depth charges and missiles. Also, occasionally, anti-tank guns and mortars...


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