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Model Boats Website Team
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What-ho chaps, hope you all had a merry one. I appear to have become the 'proud' owner of a Mamoli kit for the Americas Cup cup boat 'Puritan'. Everything is in the box with the exception of the plans, instructions and the keel and formers to build the hull. There is evidence the the owner had started to build the boat, some of the detail parts have been assembled, companion ways and the like, but all the hull planking appears to still be in its pack. I suspect he took the missing parts out to start the hull but got distracted. Sadly he died earlier this year but the kit is a few years old. Now this is where you come in, hopefully. Has anyone out there built this now out of production kit and still has the plans that came with it? If so can you send me a copy, I'll pay the copying and postage costs, or can you send scans of the plans?. The interweb has yielded a set of lines and I think I can get them into scale, having found the basic dimensions of the boat, but the actual plans might yield information to ease the build. Either way I hope to produce a build blog along the way - but I've set out to do that before and failed on a Type 21 frigate HMS Active built from scratch, got carried away building the boat. Thanks in advance Graham 'smiggy'
Thanks Gerry, your post came as I was posting my reply to the above. The links I found didn't have the /frame.htm ending which makes the link work. Sometimes I don't get the imterweb Anyway, thanks again to all for helping. Graham
Thanks guys. When I Googled it I got several links to the web site that didn't work, except one to their photos page. It was a trip to Deans Marine and a chat with Ron that prompted me to get in touch with the club (he didn't have a contact number to hand but we both thought it would be easy to find) for advice on solving a problem we've got at our club. The modelboats.co.uk link came up with the goods. I've phoned Mick, their secretary, and left a messaged and he has phoned me and left a message but I'm confident that we will be talking to each other soon!
Hi, I'm trying to contact the Secretary of the Peterborough MBC but can't find a contact. Their web site isn't working at the moment, so is anybody a member or know how to contact them? Thanks Smiggy (Graham)
The lake isn't used as a breeding pool any more. There is a boat hire business but its just pedalos now. I'm sure you'd be made most welcome but the weed really is a problem at the moment. Where are you based now?
This is our problem. A good wind in the right direction can clear a patch but as soon as it drops the water is covered. It is quite dense and it takes a powerful boat to get through. The other problem is you can't see and debris floating under the weed. Is been getting worse over the past few years and at the moment e are mostly a social club.
Hi seafarer, I've scratch built a Type 21 frigate and managed to find motors for the radars. I got them from a company called Precission Microdrives, web site https://www.precisionmicrodrives.com/gearmotors. They don't come cheap, the three on the mast cost £45 - and then there's the replacement for the one I 'lubricated' with super glue. That said the effect is fantastic and they just make a slight whirring noise when running and go all day on the 6 volt battery (I needed to fit resistors to them to get the speed down a bit). Hope this helps. Graham PS The service was very good. PPS The film of them working doesn't appear to be working so I've posted a still, the motors are 20mm long to give an indication of the size. The air traffic control radar on the bottom platform shows the full length of the motors. PPPS Web address changed, thanks Dave.
Having dabbled with building websites, many many moons ago, I can appreciate the work that goes into projects like this. We're blessed to have someone with the talents and energy you have Stephen looking after us. Excellent work, well done and thank you.
This is the props bit from the instructions, "I bought a pair of contra-rotating brass props from the Prop Shop taking their advice on the best size for the boat (their ref 0871/3 M2). The prop shafts are Graupner jobs with 96mm tubes, 114mm shafts with M2 threads. At around the same time I bought half a dozen cheap 6V motors, the Intention being to use one per shaft." Forget the cheap motors, I'm running 2 x 280's at the moment and a 9V pack of AAA batteries spread out around the area where the original battery tray was. Not ideal. It's either more power, brushless, and lighter batteries or major weight loss, re-building the deck and above in lighter material. I still intend to rebuild the old one I dissected to see exactly was inside. I haven't the 'oomph' to this at the moment but it will happen, honest. In fact this discussion has got the juices stirred..... 👍
I'm with Dave about the old Midget motor and running it on a higher voltage. It sound like you're keeping the lovely original large brass props but they will take a lot of turning at higher speeds and I do fear for the 1950's motor. Also when I was 'researching' the project I met a guy who had done the conversion and whilst he was reluctant to tell me anything about the steering, other than a hole in the well deck was the only way, he did say that if you stick with the original props they generate a lot of torque at higher speeds as they not handed and both spin the same way. The result makes the boat unstable and rolly, if you see what I mean. Whatever you do don't take the deck off. There has to be a perfect watertight seal or the boat will take on water as it sits low in the water. I can't think of any way of achieving this and maintaining easy access to the mechanical gubbins inside. A hole in the well deck lets you get at the steering hear and is fairly easy to seal. As Dave says please do let us know how you get on. Graham
Hi All I rather think that the angle of the props is to allow the original design to use the Mighty Midget motor and drive both props with a rubber drive band (laggy band to you and me). As the resultant power was enough to potter around the boating pond it was considered 'job done' at the time. I think Dave M is bang on in altering the angle, if you look at the fuzzy outline on the Plans and Docs page you can see that the prototype prop shafts were at a much more shallow angle and had less showing through the hull. Anything to save weight is a must and LiPo batteries and brushless motors are a great idea. I say this but because of stories of doom and fire about the LiPos and my view that brushless motors are the work of Beelzebub (because they have 3 wires) I haven't gone so far. Brushless motors indeed, you'll be telling me next that they're going to put a man on the moon! Smiggy
Good luck if you do give it a go. The beauty of using balsa is that it is so easy to work and is very light so you aren't adding any real weight at the top of the superstructure, something that is vital on these frigates that can be very tender and roll a lot. Most of my frigate is balsa for just this reason and it can carry enough ballast to keep it stable in all conditions.
I made the funnel for my Type 21 frigate by the old bread and butter method using 1/4in balsa. I drew the different sections needed, glued them together and then sanded them down. The cap was made in one piece and fitted onto the top face that was sanded to the correct angle. It was then finished in a couple of coats of resin to seal the job and then filler where necessary. The various exhausts are from odd bits of tubing in the scrap box, but the rectangular vents for the Olympus engines were a fiddle getting the angles right so that they stood vertically on the angled plane. If you want to try 3D printing talk to Fireboat, aka Stephen, who runs this site, as he had a 3D printer and produced a load of life raft canisters for me and was very helpful. Graham
Well I did make It with my little Victory Industries Fireboat but didn't sail It 😯 there was lots of wash from the bigger boats. It was a good event and I'll definitely be there next year, weather, money and health permitting. Sign of age that, time was It was only money permitting 😯 In the end the club sold themselves short as they had a BBQ selling burgers and drinks and there was a stall around the corner doing likewise as well as the Ice cream van. Well done and thanks King Lear.
HI Emma, I'm a little confused as the story of the project should be visible with the post with this photo attached. If you found this In a random search the rest of the project write up Its In the Build Blog section of the site. If you are around I'll be at the King Lear event with the finished boat from around lunch time on. Who knows, If the water Is calm enough I might even risk a turn on the water! Graham (smiggy)
I've just finished a mostly scratch built Type 21 frigate 1/96th scale. I was hoping to source at least some of the fittings from Sirmar as they are/were the only ones working In that scale. I managed to locate some of the parts but have had to make most. The worst part to have to make lots of the life raft canisters. In desperation to get the boat finished I ended up cannibalising my model of a Type 22 so I still need some more. Similar with the Corvus chaff launchers, but there are only 2 per boat and I do know where there Is at least one In kit form. I have considered buying a kit and making up a mould and casting some afresh, or patiently making a load using some dowel and a lot of patience but If you can make some then great. I suppose the next question Is what Info do you need. I can draw one for you with dimensions and send a file (Illustrator or PDF) to you via PM.
Hammer, I find It very hard to throw anything away In case It comes In useful. Mind you, finding It again Is another matter. 😯 Alan, feel free to pinch away. As for the circle - no Idea. The decking Is thicker there but the circle doesn't appear to do anything as all the deck/cover did was give access to the motor and drive belt, or laggy band as we called It.
Thanks Dave. I did have a thought this morning, I should have weighed the original boat In Its sailing trim, batteries and all, and put It In the test tank before I started so I had a datum to work from. I'll be blowed If I'm going to strip the boat down for this but I'll put all the bits In the hull of the wreck and see how that floats/weighs. Finding some batteries might be a problem though. I also have a cunning plan on driving the contra-rotating props from one motor but this will need throwing a few beer tokens at It so don't hold your breath. I value my trips to the therapy centre to talk rubbish with like minded Individuals. 😛 You'll have to put a blog up when you do start work on them so everyone can see how a 'pro' tackles It. 👍
Well, the beans have been spilled, all over a build blog 👍 . I still don't understand why the blogs read back to front - begin at the end and end at the beginning - and uploading pics from a Mac Is a problem, but If I can put steering Into a Victory Industries .................. 😎
Post Script. My boat's davit went missing many moons ago so encouraged by Dave M I have bitten another bullet and made one. But this one Is more than just cosmetic. I've never been happy with the security of the small deck between the two cabins so I have fixed this. I put a lip along one end that hooks under the deck flange. The locating peg on the davit Is long enough to take a hole and a short length of wire (paper clip obviously) that hooks under the deck flange at the other end. When the davit Is turned to be over the side of the boat It's unlocked and when It Is turned to point forward It's locked, securing the deck. (Photo 11)
The maiden voyage. Well, mixed fortunes. The Cunning Plan Mk1c - steering system, small fire boats for the use of worked a treat 👍 Unfortunately the overall weight proved more of a problem than I expected. There was power a plenty and she went like the clappers but getting there was a bit nerve wracking. The angle of the props forced the bow down and I had to be careful until the hull generated enough lift to get the bow up and a give nice bow wave. Not planing like her larger sisters but she did look something like the picture on the box. You can see the problem In the water shot, the green stuff on the foredeck Is some pond weed we're plagued with at the moment. (Photos 10 and 10A) The battery position Is tricky as this will be single heaviest part of the kit. As you see In Photo 9 I tried Velcro-ing It to the roof of the aft cabin but this put the CoG of the boat too far back and left the transom gunwale just above the water meaning that the well deck would fill with the slightest wave or when reversing. The maiden trip was with a 'hump' 6v pack just ahead of the motors but this meant that although the boat was level the bows were a bit too low. The current set-up Is 4 AA batteries, 2 either side of the motors and 2 In the roof as before. It looks OK In the bath........ I hope this will Inspire some of you to take the plunge. I'm no engineer and have completed this with a standard household drill, a Dremel type drill for cutting the cockpit hole and the usual small pliers, wire cutters, small files and tweezers any modeller will have to hand and a small desk mounted vice. The only slightly specialist tools were a pack of fine drill bits and a couple of pin drills obtained on Ebay. A small pillar drill would have made drilling the rudder shafts a lot easier but I passed the Initiative test (and only broke one drill bit). I only have a very basic understanding of electricity and have only just figured out soldering. This Isn't Intended to be a definitive solution and If you can see alternatives to the above, especially the power plant let us know. Using lighter motors will help and using just one will too, but driving contra-rotating props from one motor Is beyond me - at the moment. Oh, and I really wouldn't advise taking the whole deck off. You'll never get It back on properly unless you're very good or very lucky. I am contemplating rebuilding the test boat but with a completely new deck structure probably made of balsa wood to save weight - and because I bought a load cheap a while ago...........
Final assembly, read this all through before starting. All the modules were designed to fit Into the hull through the existing removable hatches and the hole cut In the cockpit deck. This Is how I did It to achieve a reasonable balance fore and aft using my existing motors and battery packs. The esc fits neatly between the servo and motor mounting plate and the wiring was connected up before fitting the motors Into the boat. The receiver fits In the front half of the boat but the position of the battery pack Is a problem, see the end of the assembly. This was the best position to balance the boat but on final assembly I got obsessed with sticking a stick battery under the old battery hatch roof. Big mistake as this moved the CoG back and the transom waterline was just under the deck. I found It easier to plug the esc and servo wires Into the receiver before fitting the motors Into the boat. So, fit the battery and then feed the receiver and motor/esc assembly through the old battery hatch and fiddle It forward Into position and feed the receiver around or next to the battery. Fit the motors mounting plate over the mounting lugs and make sure It Is firmly mounted. The rudder servo can now be placed In position over Its mounting lug and between the two prop shaft humps. Fit the prop shafts and connect the UJs to them. Now comes the fiddly part. Hone the bearing surface of each rudder shaft with some fine wet and dry and fit a rudder Into the boat and make sure you can see the tiller hole. Now, remember those molding lugs under the cockpit? On the test boat they came off with the access hole but on my boat they were slightly different and had to be cut off. A fiddle but It has to be done. Using a small amount of superglue on the end of the tiller fit It Into the hole making sure that no glue gets onto the rudder tube and glues everything together. If you do need to get everything apart later It's quite easy to break the glue join by twisting the tiller. Repeat for the other rudder. Then, using a piece of wire, put a drop or two of light oil down the rudder tube from the bottom. This will seep Into the gap between the tube and shaft and the honing will retain the oil like the honing of the bore In an engine and form a flexible seal. If you didn't get reduced to swearing at that you probably will at this. Fit the push rod onto the RAL so that you can feed It forward towards the servo as you fit the control assembly onto the two tillers and the RAL pivot. Now fit the other part of the pushrod onto the servo arm and connect the two parts of the connector. Sounds easy but make sure you have some valium handy. Dentists and gynecologists should find this easy. Tweezers and fine pliers are essential. All you need to do now Is fire It all up for a final check that everything works, and why shouldn't It, you've been so careful. Now Is also the time to adjust the rudder linkage to make sure the rudders are straight when the radio stick Is In the middle, but you knew that anyway. And whilst you're asking, the RAL should stay on the pivot, but to make sure It does I put some packing under the cockpit floor so that this rests on top of the pivot when Its all put together. (Photo 8) When you have finished It should all look something like Photos 9 & 9A. Now seal the gubbins under the cockpit away under a watertight lid. The cockpit will get water In It and It will find a way Into the boat and It won't take much to consign all your hard work to Davey Jones. It took me two goes, eventually using silicone and the best named product around - Captain Tolley's Creeping Crack Cure, available on the Interweb.
The base plate that supports the pivot for the right angled lever that converts the side to side movement to fore and aft Is located over the Inner P bracket lugs and extends to the lug at the rear of the servo mounting using the same bolt to retain It. All very neat. The actual pivot Is the same 2mm brass rod used for the rudder shafts. The mounting block Is two pieces of scrap glued together and drilled to take the rod. The only odd 'found' component Is the white plastic tube that supports the lever. Any diabetic that Injects will be sick of the sight of these as they cover the needle points. At last, a use for them - well one at least. If you do decide to use this system don't stick the pivot down Immediately as Its position relies on the lengths of the various levers. I made the levers and when satisfied put everything together In situ and fiddled with the pivot position (double sided tape helped to tack the pivot down whilst doing this). When happy with the position I marked It and then stuck It down. The plate that connects the rudder tillers and the right angled lever (there must be a shorter term for this) has a slot In It to take the RAL (there, that'll do). What you see In the photos Is the Mk3. The trick Is to stop the lever fouling the slot whilst supporting the plate. The part of the lever that slots through Is 'U' shaped and there's a small thin plastic plate glued to the U either side of the connecting plate. By forming the pivot loop around the 2mm brass rod meant that the RAL stayed horizontal keeping everything In line. (Photo 7) NB On final assembly the crank on the arm from the servo Is fitted upside down to this photo to make It easier to fit the whole thing Into the boat. The last piece of the jigsaw Is the link between the servo and the RAL. Without using a clevis this can't be fitted with everything In situ so Is split to make this possible. The join also allows for some final adjustment. The joining piece Is the brass Insert and screws from a small electrical connector block. The split has to be one long and one short as the only access to the join Is either through the cockpit hole or the old battery hatch but the choice Is made because the brass connector can foul the floor under the cockpit.
It was obvious from the start that the original rudders had to go but how do you control them? I had toyed with the Idea of starting from scratch and moving the shafts away from the transom giving a bit more room to attach a lever to the top but surveying the deckless hull It was obvious that this would Involve a lot of work Including making new P brackets to get the props further forward. The Idea of drilling a small hole In the shafts to take a wire tiller facing forward was hatched as this would give a large range of movement but not take any room to the rear of the shaft. First the hole that takes the original rudders Is opened out to take a 2mm ID tube and carefully drilled through to the Inside of the hull. Whilst It's fairly clear above the mounting bosses stop as soon as the drill breaks through. You will need a 19mm length of tube to sleeve the hole, this will just fit leaving enough room above It for the tillers to fit In the hole you will need to drill In the top of the shafts. The shafts should be 2mm dia to match the tube and 46-47mm long and the centre for the hole for the tillers should be 1.5-2mm from the top. The diameter depends on the wire (paper clip) you use for the tillers. The tillers are bent from wire with a crank In the end. I put a piece of heatshrink onto the tillers to act as a stop when you Insert them on final assembly but a piece of tape would be just as good. (Photo 5) The rudder blades can be salvaged from the original and soldered onto the shafts or new ones made from plastic and glued on. I know the purist would baulk at this but If I soldered them on they would fall off just after the boat got out of reach of the shore. I've put my faith In modern adhesives. I do have another cunning plan Involving yoghurt pots If this plan fails. Photo 6 shows the assembled mechanism that was designed to be easily fitted through a hole cut In the well deck floor. In practice the word 'easily' Is open to Interpretation.
So to the steering. Before we start, all the wire used In this was kindly donated by various paperclips of different sizes. First cut a hole In the cockpit floor around the embossed hatch markings and adding the 2 semI circular extensions to give access to the tops of the rudder shafts. Make sure to leave an adequate lip to mount a false floor over the hole and make a watertight join. Attached Is a jpeg file of the shape of the floor to act as a template but the resultant floor will need fettling to get a good fit. This Is supposed to be a pdf file but I can't upload that so I can't guarantee the size. I recommend cutting a thick paper or thin card one first to check for problems before cutting a plastic one. I made mine out of 1mm plastic and to avoid an ugly gap around the steps I shortened slots for the sides of the steps by about 1mm and the chamfered the ends of the slots so they rest against the steps. The original hatch Is marked on the pdf so when transferring the shape down you can pin prick through to mark the corners and then draw the hatch, I used the point of a pair of dividers. Fitting a small servo between the humps where the prop shafts exit the hull seemed a good Idea. There Is a central lug to the rear of these that Is used to mount the battery box on some boats that offered a handy mounting point for a base plate to mount the mechanism on. The base plate was made to fit comfortably between the humps to locate It sideways and long enough to fit over the lug and be screwed down. The mounting for the servo was glued to this plate. (Photo 4)
I had already been advised not to use the nice original brass props as they are too large and exert too much torque on the boat at speed. To this end I bought a pair of contra-rotating brass props from the Prop Shop taking their advice on the best size for the boat (their ref 0871/3 M2). The prop shafts are Graupner jobs with 96mm tubes, 114mm shafts with M2 threads. At around the same time I bought half a dozen cheap 6V motors, the Intention being to use one per shaft. The prop shafts are a straight swap for the originals being the same outer diameter, always assuming the O rings that seal the hull-shaft join are OK. The motor mounting push fits over the original lugs. Once the motors are attached to the prop shafts everything Is secure without having to screw the base down. This alleviates the problem of access to the screws and the motor and bracket assembly Is easily fitted and removed. Once the base plate Is made and fitted and the motors are mounted onto their base and connected to the shafts and UJs It's a simple job of measuring the wedges that join the two and present the motors at the correct angle. I guess you could just mount the motors horizontally onto the base plate but I don't know what the tolerance of the UJs Is. (Photos 2 & 3) The options for different motors and drives, Including sticking with the original are many, this Is just my take on the Issue. The motors I used are quite heavy at 40g each and I have thought of fitting smaller lighter ones. I have a couple but they are 9V and the extra weight of the batteries, let alone the space taken, put me off. Has anyone experience of or Ideas about brushless motors and lipo batteries? I was put off lipo when I saw a fire proof bag to put the batteries In when charging them and then the problems Boeing had. They sound like the work of the devil to me! Plus I'd have to cough up some beer tokens for a brushless/lipo set up.
(When you read this section try to Imagine the opening sequence to the first Star Wars film with the text disappearing Into the distance.) 😯 It was a great birthday when I was given a Victory Industries RAF Crash Tender. The picture on the box showed a boat planning at speed, but despite the best efforts of the Might Midget electric motor the model never actually reached such velocities. It was a free sailor following the course set by Its two brass rudders at a disappointingly pedestrian speed. Nevertheless I loved that boat. There was something about Its looks. Obviously I wasn't the only one judging by the number of models of the two prototype craft that have been produced over the years despite such a short active service. It was always my dream to see my boat speeding across the water and under full control. A dream I had when I polished Its shiny, sleek black hull. I knew nothing about radio control other than It was for adults and cost money way beyond my pocket money. Now I am an adult and have a bit more pocket money and by a happy accident I now play with radio controlled model boats. An expedition Into the loft uncovered my beloved boat and I started to think about how to go about achieving the two goals of making It go faster and under radio control. Parts were bought with this Intention but work never commenced as I didn't have the confidence or experience to start cutting Into the boat I'd kept for so long. Converting a RNLI Severn to 'proper' RC was the Inspiration I needed. The main breakthrough came when I bought an old boat that was way past Its best and had lost all the deck fittings off Ebay. I cut the deck off to see what problems lay hidden and started to work out the best way of fitting a rudder system Into a confined space. What follows Is the result........ Through the removable hatches on a complete boat you can see the obvious mounting lugs for the motor and the four lugs that take the screws that hold the prop shaft P brackets. The big mystery was what else Is there under the rear cockpit deck. The answer Is not a lot. The main problem Is 4 molding lugs under the well deck floor that look like a by product of the molding process. At this point I will say never assume, assumption Is the mother of all cock-ups. As It turned out the shape of these lugs differs between my two boats so don't assume that you can work around them, more later. (Photo 1)