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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
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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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Remove Ads ๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง dave976 ( Captain)
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง dave976 ( Captain)
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 176 Views ยท 2 Likes
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"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 hull๐ฎ, it's built using composites I believe. Stay safe U2, Doug ๐ ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง Nerys ( Fleet Admiral)
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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"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 right๐) they supply an alu flange to go between the two parts? But wadda I know about water jets๐ Alls well that ends well I trust ๐ค Cheers, Doug ๐ ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 176 Views ยท 2 Likes
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Hi Nerys,
Not quite 'ship shape' eh Nerys๐ 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 well๐ค All the best, Doug ๐ PS: Sorry Dave, got me typing fingers in a twist. Don't know me Ks from me Ms ๐ Oo's bin muckin aboot wiv me keyboard? ๐ ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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"Cannot vouch for the quality, ..."
Never mind the quality Rowen! FEEL the width! ๐ Perhaps it's just as well then that KMB was so unresponsive. Cheers ๐ ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง Nerys ( Fleet Admiral)
โง 179 Views ยท 3 Likes
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Interesting shape ship, don't know what the designer of HMS Dreadnought would have had to say about her.
Nerys ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 175 Views ยท 4 Likes
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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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Remove Ads ๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง dave976 ( Captain)
โง 187 Views ยท 0 Likes
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 176 Views ยท 2 Likes
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฌ๐ง dave976 ( Captain)
โง 187 Views ยท 2 Likes
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Hi Rowen
Sounds interesting. I have a Shannon to build using twin waterjets. I got mine from ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 182 Views ยท 3 Likes
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Hi Rowen,
Thought the Aussie option would be too expensive with freight an all๐ค 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 guess๐ฎ) 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 ๐๐ "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 course๐ But you aren't going BB gun battling. ARE YOU?๐ฎ ▲
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 181 Views ยท 3 Likes
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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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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 182 Views ยท 2 Likes
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PS: You can get a 1:72 scale hull here (101cm x 14.5cm) ๐ฎ
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๐ฌ Re: H.Sw.H.S. Visby
2 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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๐ฌ Re: H.Sw.M.S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 155 Views ยท 0 Likes
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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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๐ฌ Re: H.Sw.M.S. Visby
2 years ago by ๐ฌ๐ง RC-Modeller ( Recruit)
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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 21โฌ each. If you need any more help, pse PM me. Regards Chas ▲
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๐ฌ Re: H. Sw. M. S. Visby
2 years ago by ๐บ๐ธ pressonreguardless ( Rear Admiral)
โง 111 Views ยท 0 Likes
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Only in America, Land of Opportunity๐คฃ๐๐คฃ๐
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Remove Ads ๐ฌ Re: H. Sw. M. S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
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Could well be! My stuff comes by air, allegedly. When tracked it usually flies direct to Toronto so avoids the US.
No reason why that problem could not arise here though. Rather more of a challenge to throw things out of an aircraft!! ▲
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๐ฌ Re: H. Sw. M. S. Visby
2 years ago by ๐ณ๐ฟ jbkiwi ( Fleet Admiral)
โง 138 Views ยท 1 Like
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Hi Rowen, perhaps this is why the postal service is slow up your way ?
▲
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๐ฌ Re: H. Sw. M. S. Visby
2 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 144 Views ยท 1 Like
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Hi Toradog, hope you feel better now!
Am likewise fed up of shipping companies. In Canada they have now included the โfloods in BCโ as another reason for delays, even if your package is airfreight! The legacy of COVID will be milked for years. Glad you enjoy the blog, most of my projects are coming to a halt as parts are in the mail! ▲
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๐ฌ Re: H. Sw. M. S. Visby
2 years ago by ๐บ๐ธ ToraDog ( Captain)
โง 144 Views ยท 2 Likes
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Rowen,
Looking fantastic. I hope you will allow me a short rant. DHL is now charging a "breakage fee"? Shapeways dded a processing and and handling fee that is a percentage of the order, UPS and FED EX no longer guarantee delivery by stated dated, and the US Post Office has gone back to the Pony Express. Not to mention that every company is using COVID as an excuse not to fill orders in a timely manner. Besides the lives lost, which will never be overcome, we have not even begun to realize how much this pandemic has, and will forever, change our lives. Sorry Rowen, Keep your build flowin'. ▲
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๐ฌ Re: H.M. Sw S. Visby
2 years ago by ๐บ๐ธ pressonreguardless ( Rear Admiral)
โง 141 Views ยท 0 Likes
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Looks Great. Very anxious to see her in operation๐๐
Trev ▲
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