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    H.Sw.H.S. Visby
    by Rowen ๐Ÿ‡จ๐Ÿ‡ฆ ( Commander)
    ๐Ÿ“ฃ










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    ๐Ÿ“ H.Sw.M.S. Visby
    2 days ago by Rowen ( Commander)
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    Decided the Visby class would make an ideal project so started to accumulate the necessary bits.
    Another modeller donated a pair of used KMB 28mm waterjets, but missing the reverse / steering nozzles. After this stroke of luck, turned to obtaining the missing nozzles. Thought getting a pair would be easy!

    Made innumerable attempts to make contact through the KMB website. Then E mails and even telephone calls from Canada to place an order, got absolutely no response.
    Finally, in desperation, thought as โ€œRN in Munichโ€ lived in the same country and speaks German, perhaps he would be able to make contact locally. Doug gave his usual generous support.
    After many attempts - nothing (thanks again Doug โ€“ now I know what Fleet Admirals are for!). Fortunately, we both gave up.

    By now had obtained some scale GA drawings and printed them off at the appropriate size. Discovered that the KMB jets were too big to fit in the stern recess anyway!
    Searched for alternatives and found there are many different sizes available.
    Through AliExpress, found a 22mm jet unit made by MSQ. With some trepidation, ordered a pair.
    These arrived quite quickly and were nicely manufactured. Think they are 3D printed, but not sure. Anyway, they look good and robust. With minor modifications, they will be fine. The KMB are the black and the MSQ white in the photo.
    With the wisdom of hindsight, it might be easier to install an even smaller unit, but too late. Anyway, the 22 mm should move more water than a smaller one.
    As the original vessel could do some 35 knots, this should make max. speed more realistic.
    The challenges of squeezing these units into the available space do not look insurmountable. Rather too late anyway as now have them.
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    ๐Ÿ’ฌ Re: H.Sw.M.S. Visby
    1 day ago by Rowen ( Commander)
    Flag
    Thanks Chas for your offer and interest.
    In a nutshell - no, never got through to them.
    Anyway, the 28mm unit turned out to be larger than could get into the space, so they would not have worked anyway.
    I opened an account, with Canada as the address, it made no difference. Then Doug tried from Munich, he could not place an order in Germany and then ship to Canada.
    Think he heard K.M.B. has changed ownership, so these might be start-up troubles. Doubt Brexit is the issue.
    The MQT units I finally bought were not much more expensive for the whole assembly, including KaWeMa style reversing/steering units. They look as if they will fit too (that was not KMBs fault, just mine).
    AliExpress and Bangood have a range of waterjets on their sites. Some look good, others maybe not so.
    Was thinking could adapt one of their steering/reversing units to a K.M.B. body, but never got around to trying.
    Thanks again,
    Rowen
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    ๐Ÿ’ฌ Re: H.Sw.M.S. Visby
    1 day ago by RC-Modeller ( Recruit)
    Flag
    Hi,
    Have you managed to get your reverse for your KMB jets?

    I live in the UK, and since Brexit when we left the EU Market, they won't send to the UK. It's a shipping company issue at the moment.

    I like you tried to contact them several times with no luck. As I had purchased from them several time before, I just changed my delivery address to my Son's in Germany. He then sends stuff onto me.

    I have purchased from KMB for several years with no problems, and still buy from them via a different route.

    I've checked their website, and They do ship to Canada, so I think you will have more luck if you just open an account, then just go ahead and buy them online.

    The - KMB JET28 KaMeWa-like steering and thrust reversal system, is the better of the two reverse units at 21โ‚ฌ each.

    If you need any more help, pse PM me.
    Regards
    Chas
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    ๐Ÿ“ H.Sw.H.S. Visby
    10 days ago by Rowen ( Commander)
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    Been trying to find an interesting model for my next build and was intrigued by the articles on a semi-scale waterjet powered Finnish stealth corvette in the Model Boats magazine. Thought that a similar model would be an interesting introduction to the world of waterjets.

    Quickly discovered that to make a scale model with a manufactured glass fibre hull (my preferred construction), would have to find a similar vessel as nobody offered a GF hull for that ship. The author of the article had made his semi-scale model by adapting another hull.

    After searching around, discovered then decided on the Swedish Visby class. This was an early version of a stealth corvette and has had excellent reviews in the various defence forums. Was waterjet powered and of similar dimensions, meeting my requirements.

    Concluded this would make a nice project, so started to accumulate the necessary parts.
    Researched the class in more detail and found Swedish naval vessels are also know as โ€œH.M.S.โ€, but in Swedish! The Swedes have a proud naval tradition and use a similar nomenclature to the British. They are referred to as โ€œH.Sw.M.S. XXXโ€ amongst the Naval fraternity.
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    5 days ago by Rowen ( Commander)
    Flag
    Thanks Dave,
    Had already decided to use a "coffer dam" approach, good to see it reinforced by an authority.
    The suggestion to fit the unit to the bottom of the hull first is a good one. Was going to fit to the transom first, but if this works for Dave, will emulate it.
    Thanks Rowen
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    5 days ago by dave976 ( Midshipman)
    Flag
    Hi Rowen
    Spoke to Dave to-day and he has a similar unit to yours. As expected he researched what was available and how others had fitted their units. As a result he has no water ingress.
    Basically he made a coffer dam round the unit where it joins the hull bottom. This was fibre glassed to the hull. He then used a sealant between the hull and the unit that dries hard but remains flexible. He has no problem with the transom connection. In discussion it would appear that a glued joint fails over time due to vibration. I believe I will use a similar system but fit a metal plate to the outside hull and bolt this to the flange on the unit. We are really in the realm of the submariner and they always use bolted fixtures to seal anything exposed to water.
    Dave's instructions also advised fitting the unit to the hull and then cutting a hole to size. Dave used some mastic to seal the residual joint line.
    Hope this helps and looking forward to your buid
    Dave
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    8 days ago by Rowen ( Commander)
    Flag
    Thanks Dave. Would be interested in Dave Ws advise and thoughts, he is one of the modellers whose work astounds me.
    Rowen
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    8 days ago by dave976 ( Midshipman)
    Flag
    Hi Rowen
    Looking at the Ali version it appears to be well made and I suspect they used stainless for the metal fittings. A magnet will not attract and reveal if it is stainless. It was several years ago when Brian had the problem and I am sure the later versions have rectified the issue. My waterjet units use plastic flanges where the unit fits to the stern and there is a machined joint from the internal waterjet to the output unit. I have not progressed my build so cannot say if it will leak but I have not heard of any problems from others who have fitted and used the exact same unit. My friend Dave Wooley has installed waterjets in his recent model so I will ask if he has found this to be an issue.
    Dave
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by RNinMunich ( Fleet Admiral)
    Flag
    "put wings on her and she's not unlike a stealth bomber"
    Not surprising Nerys, same principles are used.
    Minimise the area of surfaces which reflect radar waves back the way they came, especially vertical surfaces. I.e. Scattering. Thus reducing the size of the echo. Allegedly the Visby, and similar small ships, look like innocent small fishing boats on radar plots.

    Reckon cannonballs from close range could have punctured her hull๐Ÿ˜ฎ, it's built using composites I believe.
    Stay safe U2,
    Doug ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by Nerys ( Fleet Admiral)
    Flag
    No Doug, to my eyes there's nothing ship shape about her at all, put wings on her and she's not unlike a stealth bomber, but at least the cannon balls would roll off those near vertical sides.

    Cheers, Nerys
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by RNinMunich ( Fleet Admiral)
    Flag
    "Unlike the KMB, where the outlet slides into the nozzle, there is a dual flange with O ring layout. "
    Rowen; as I understood from the KMB site (Hooray, got it right๐Ÿ˜€) they supply an alu flange to go between the two parts? But wadda I know about water jets๐Ÿ˜‰
    Alls well that ends well I trust ๐Ÿคž
    Cheers, Doug ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by RNinMunich ( Fleet Admiral)
    Flag
    Hi Nerys,
    Not quite 'ship shape' eh Nerys๐Ÿ˜‰
    I reckon first thing Jacky Fisher would have said is
    "Where are the bloody guns?"
    Second
    "RADAR, what the bloody hell is that?"
    Trust you and the worthy Alice are keeping well๐Ÿคž
    All the best, Doug ๐Ÿ˜Ž

    PS: Sorry Dave, got me typing fingers in a twist. Don't know me Ks from me Ms ๐Ÿ™„
    Oo's bin muckin aboot wiv me keyboard? ๐Ÿ˜
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by RNinMunich ( Fleet Admiral)
    Flag
    "Cannot vouch for the quality, ..."
    Never mind the quality Rowen!
    FEEL the width! ๐Ÿ˜‰
    Perhaps it's just as well then that KMB was so unresponsive.
    Cheers ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by Nerys ( Fleet Admiral)
    Flag
    Interesting shape ship, don't know what the designer of HMS Dreadnought would have had to say about her.

    Nerys
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by Rowen ( Commander)
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    Hi Dave,
    Cannot vouch for the quality, although the construction looks sound.
    Think the body is 3D printed and the impellor aluminium (optional). The shafting looks stainless steel. The motor is additional, but fits straight up to the mounting flange.
    Unlike the KMB, where the outlet slides into the nozzle, there is a dual flange with O ring layout.
    I understand this is an area of common waterjet leakage, so the O ring idea might be better.
    Not wanting to reveal too much of my next blog, but the KMB would not have worked anyway!
    Rowen
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by dave976 ( Midshipman)
    Flag
    Hi Rowen
    I hope they are similar. A fellow club member used a Graupner type which he had to strip after every use as it seized with rust.
    I haven't even started this model but have attached brushless motors to each unit and have Esc's and many of the bits including the hull. I think yours will be finished before I start.
    Dave
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by Rowen ( Commander)
    Flag
    Hi Dave,
    That is the company. Have still got the jet units and they look fine. The ones I got from AliExpress look almost as good.
    Will not know until the model is on the water. Maybe next Summer
    Rowen
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    9 days ago by dave976 ( Midshipman)
    Flag
    Hi Rowen
    Sounds interesting.
    I have a Shannon to build using twin waterjets. I got mine from
    https://kehrer-modellbau.de/en/KMB-JET28-Rev.-3/?p=1
    Brilliant engineering and much better than some other offerings. Is this the site Doug was referring to?
    I hope you have good eyesight as it may start to blend in at distance.
    Dave
    https://kehrer-modellbau.de/en/KMB-JET28-Rev.-3/?p=1
    ๐Ÿ”—
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    10 days ago by RNinMunich ( Fleet Admiral)
    Flag
    Hi Rowen,
    Thought the Aussie option would be too expensive with freight an all๐Ÿค”
    Look forward to the detail of what and where you find the alternative.
    What scale will she be?

    Ref the folding gun! (Better than a smoking one I guess๐Ÿ˜ฎ)
    Would be cool if you could cruise along the shore in stealth mode ...
    then suddenly unfold the gun ...
    and blast the unsuspecting spectators with a pulsed water jet salvo
    ๐Ÿ˜๐Ÿ˜‚
    "Problem is the long, narrow hull ..."
    Perennial problem with warships Rowen. The high length to beam ratio (generally around 10:1) increases the max speed achievable for a given power plant.
    One reason why the engine rooms and boiler rooms / generator rooms are staggered on warships with 3 or 4 shafts; carriers etc. Another being damage control of course๐Ÿ˜‰
    But you aren't going BB gun battling. ARE YOU?๐Ÿ˜ฎ
    https://www.youtube.com/watch?v=R94Rr781-Uk
    https://www.youtube.com/watch?v=w4d3yn9CHGY
    Have fun squishing in the jet drives๐Ÿคž

    Yeah, shame about MKB. Was glad to have tried to help.
    Very odd. Their site is still up but they don't react to anything!
    Glad you found an alternative source. Look forward to the details in the blog.
    Go go go Commander; ALL AHEAD FLANK SPEED.
    Cheers, Doug ๐Ÿ˜Ž
    AKA 'Sleepless in Munich' ๐Ÿค”๐Ÿ˜ด
    https://www.youtube.com/watch?v=R94Rr781-Uk
    ๐Ÿ”—
    https://www.youtube.com/watch?v=w4d3yn9CHGY
    ๐Ÿ”—
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    10 days ago by Rowen ( Commander)
    Flag
    Thanks Doug,
    Recently became aware of them. Have already placed an order though with another company.

    Your question on the gun is germaine, have not thought much about that yet. Whilst the vessel has little vulnerable and fiddly detail the internal hull layout is challenging.
    Problem is the long, narrow hull leaves little room for Waterjets and their control linkages- watch this space for future blogs!
    Thanks again for your efforts with KMB
    Rowen
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    10 days ago by RNinMunich ( Fleet Admiral)
    Flag
    PS: You can get a 1:72 scale hull here (101cm x 14.5cm) ๐Ÿ˜ฎ
    https://southerncrossmodels.com.au/index.php/corvettes/53-sw...
    Not cheap, never mind the freight from Down Under ๐Ÿค”
    About CAD165 plus freight.
    Cheers, Doug ๐Ÿ˜Ž
    https://southerncrossmodels.com.au/index.php/corvettes/53-swedish-visby-class-corvettes
    ๐Ÿ”—
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    ๐Ÿ’ฌ Re: H.Sw.H.S. Visby
    10 days ago by RNinMunich ( Fleet Admiral)
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    Excellent choice Rowen๐Ÿ‘ not too much external detail to worry about ๐Ÿ˜‰
    Are you going to make the 57mm barrel fold into the turret like the original does?
    Have fun, looking forward to following๐Ÿ˜€
    Cheers, Doug ๐Ÿ˜Ž
    https://en.wikipedia.org/wiki/Visby-class_corvette

    https://www.google.com/search?q=visby+class+corvette+model+plan&client=firefox-b-d&tbm=isch&source=iu&ictx=1&fir=zni8pU33bztREM%252CdwUz6gHbUgMWNM%252C_%253BxsoAv4TsD4VMHM%252C_l67NBw_IHJ4JM%252C_%253BOTCs6rYCveCfOM%252CdwUz6gHbUgMWNM%252C_%253BQcFKWUItXmUW0M%252CdwUz6gHbUgMWNM%252C_%253B2PWGyzcu4KiIuM%252CcejGOSusFwqKdM%252C_%253BTWa0BXkt8bBw_M%252CcejGOSusFwqKdM%252C_%253B_M35lfOLHNrrCM%252CcejGOSusFwqKdM%252C_%253B6XvJT4Sq7bhIJM%252CdwUz6gHbUgMWNM%252C_%253ByzoxZbNryZCBpM%252CdwUz6gHbUgMWNM%252C_%253BAmG2oU_yU0qpeM%252C5dVALKBBzujKUM%252C_&vet=1&usg=AI4_-kQZtlwhfVlwaLh-HF-GrOiolwa5dA&sa=X&ved=2ahUKEwjJm9rfgqP0AhXSDOwKHbTgBL0Q9QF6BAgkEAE
    https://en.wikipedia.org/wiki/Visby-class_corvette
    ๐Ÿ”—
    https://www.google.com/search?q=visby+class+corvette+model+plan&client=firefox-b-d&tbm=isch&source=iu&ictx=1&fir=zni8pU33bztREM%252CdwUz6gHbUgMWNM%252C_%253BxsoAv4TsD4VMHM%252C_l67NBw_IHJ4JM%252C_%253BOTCs6rYCveCfOM%252CdwUz6gHbUgMWNM%252C_%253BQcFKWUItXmUW0M%252CdwUz6gHbUgMWNM%252C_%253B2PWGyzcu4KiIuM%252CcejGOSusFwqKdM%252C_%253BTWa0BXkt8bBw_M%252CcejGOSusFwqKdM%252C_%253B_M35lfOLHNrrCM%252CcejGOSusFwqKdM%252C_%253B6XvJT4Sq7bhIJM%252CdwUz6gHbUgMWNM%252C_%253ByzoxZbNryZCBpM%252CdwUz6gHbUgMWNM%252C_%253BAmG2oU_yU0qpeM%252C5dVALKBBzujKUM%252C_&vet=1&usg=AI4_-kQZtlwhfVlwaLh-HF-GrOiolwa5dA&sa=X&ved=2ahUKEwjJm9rfgqP0AhXSDOwKHbTgBL0Q9QF6BAgkEAE
    ๐Ÿ”—
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