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Model Boats Website Team
December 2018: 4 people November 2018: 11 people October 2018: 9 people September 2018: 13 people August 2018: 5 people July 2018: 8 people June 2018: 8 people May 2018: 7 people April 2018: 24 people March 2018: 11 people
Has anyone done any significant modifications to a Thunder Tiger Avanti fast electric? I have one and all I have done is to replace the nylon prop with a metal one thus there is very little increase in performance and the reason for doing this was due to the nylon prop throwing a blade after striking an underwater object. Prestwich Model Boats have a suitable replacement motor complete with a better ESC than the existing Ace one and their system can handle up to 4S Lipos instead of the stock set up of 3s . I have located a source of a 4S Lipo which length and width is same as my 3S one but the height is a little more and it will fit into the battery box. To trim it out properly I would have to add some ballast to the starboard side. Due to the electrics including the battery all being in a small watertight box at the stern there is not a great amount of scope for a lot of mods. Boaty😁
Hi, I'm doing some (a lot) of research before embarking on a Bristol Pilot build. My attention has now turned to controlling the twin fore sails. A helpful guy at my club mentioned using a 'mixer'. Anyone who has controlled two foresails and/or a genoa on a racing yacht may have some ideas here - any welcome. But my initial question is about terminology. Reading my Futaba handbook - a truly excellent translation 😡- I find two terms under the mixer section - 'OFS' and 'VR' - any idea what they mean? For interest, the problem is that the front sail overlaps the rear 'foresail' so we can not simply attach a sheet to the front sail to drag it to a 'tight' position as this may tangle with the rear foresail. The second problem is that if the foresail is out to the port, the drum winch must turn anticlockwise to haul it in, whereas when it is to starboard the winch must turn clockwise. I do love these problems, but desperately need help. If its only someone telling me not to be stupid and just lket the foresail hang loose - I'm not racing afterall👍 Sam
Hi Peter. It shouldn't need ballasting very much if at all. As I won't be able to adjust the position of any heavy components I'll use small pieces of lead to adjust fore/aft and port/starboard trim. Robbob.
Hi all for the second blog report on the schnellboot I am going to go over the rudder a propeller shaft assembly in more detail. The first stage was to make the rudders which were made of brass ,and having taken note of what has been said about the increase in size needed for the kit by other members I have increased the size of the rudders by 50% so that they have more effect and hopefully the boat will be more agile .I fitted 3mm treaded rod on to the rudder and in a 4mm flanged tube to reinforce the brass rod. The second stage was to make and fit 5mm flanged tube in the location for the rudders in the boat, these were made to be above the water line and will be sealed in place to reduce the possibility of leaks. These were fitted to a rudder platform inside the boat which was fitted to the kit moulding for the rubbing strip that runs the length on the boat and secured by making resin blocks which were fitted with computer extension nuts. which were then superglue in place to secure the rudder platform. The rudders were then fitted in place and held in position with the tiller collars which were made from 8mm rod and fitted the tiller arms and locked in place with 3mm computer screws and ni-lock nuts, a connecting plate was then fitted to connect the three tillers together, I also fitted rubberised washers to seal the rudder tubes. The third stage was to make the propeller supports. The centre support was a direct copy of the kit part made of brass and fitted to the kit with a plate and screws (this plate and the rudder plate were made from galvanised steel) and will sealed with resin after the I test the boat for leaks. The port and starboard supports were made by taking the kit parts and cutting them in have along the joint line or mould seam this gave me a template ,which I used to make cross-section segments but I did alter the template by increasing the boss diameter to 10mm and extending the support legs so that the finished support could be fitted through the hull (the picture of these show the mk1 version where I forgot to allow for the 4mm prop shaft which has a 6mm tube) any way the boss of these segments were drilled out with a 7mm drill and a length of 7mm brass tube fitted through the boss to assemble the segments, all of which were coated in soldering flux at this stage of the assembly which were riveted at both ends to hold it all together during soldering, after soldering the supports were then filed to the size and shape to resemble the kit parts as close as possible and fitted to the hull using a superglue and talcum powder mix and then I cast resin around the extensions to secure the prop supports in place. The fourth stage is the propeller shaft housing for the centre propeller housing I place a brass rod in a plastic straw and place in position in hull and using resin I sealed the hull with the rod in place this gave me a pilot hole for the centre prop shaft after I removed the brass rod. For the port and starboard shafts I used the kit parts which had hole place when assembled, this when I reinforced the housings ,the centre housing I glue 2mm of plasticard on each side and for the port and starboard I made a brass tube shroud which covered the housings which left gaps between the kit part and the brass which was filled by casting resin in the gap this increased the diameter to 10 mm so that there were little chance of breaking throw with the drill and finished these off by fill-in the outside with body filler and sanded to shape and finish . I then drilled through the pilot hole in the housings using very long extended drills and a wheel brace ( if I had use a power drill the heat would have melted the plastic of the kit and may have caused problems) I drill the shaft housings out 6mm them filed them out with 6mm file so that I could insert a length of 6mm brass tube. After all this was done I fitted a flanged bush made from 7mm tube and 2mm brass plate turned to 11mm to the ends or the propeller shaft housings. And now it is time I must ask for some help could anyone advise me on the length of propeller shafts, I know I can use a 300mm shaft for the centre shaft, but port and starboard will have to be longer. and I also need advice on selecting the motors, I want to use 4mm prop shaft with 35mm propellers. Any opinions welcome.
Hi, Doug. I’ve attached a zoomed-in photo of the “Anchor Enclosure” that’s built into the starboard bow bulwark of the Wyeforce. There’s an anchor in the box but I can’t tell for sure what kind it is. Maybe a navy-type with the fluke & bill pointed inward toward the deck? A better photo is needed to be sure, so I’ll keep looking. The enclosure itself would be simple to build & fit to the hull. I remember seeing a photo of the boat’s foredeck area that showed what may have been a hawse pipe running inboard from behind anchor enclosure & down through the deck, presumably to a winch belowdecks? Does that make sense? Pete
My dad built this over a long period of time, starting in the '80s. The hull is fibreglass and the rest is scratch built from plastic card, balsa, ply, wire and anything else he could adapt. Although he installed the motors, props and rudders he never completed the RC installation or tested it. I inherited his boat models a few years ago and wanted to "finish the job", getting the model on the water. After installing the RC gear and batteries over the last few months, this weekend was the first sailing outside the bath at the Valley Gardens boating lake. Happy to report that it sailed really nicely, seems to be reasonably stable although I did restrict it to calmer times when the MTBs and faster boats weren't running ! HMS Cadiz was a battle class destroyer, laid down and launched during WW2 although she didn't receive her commission until 1946 so didn't see combat with the Royal Navy, serving with the home fleet. Due to the changeover in pennant numbering she was originally allocated R09 and later, when the admiralty decided to revert to the D for Destroyer pennant numbering she was assigned D79. To reflect this my model has D79 on the starboard side and R09 on the port side. She was sold to Pakistan in the late '50s, and renamed PNS Khaibar. She was sunk with the loss of nearly all hands in 1971 in the Indo-Pakistan war.
Been researching the squeal and stutter on other websites and conclude RFI is probably not the major contributor. Others attribute it to a mismatch in the ESC / motor timing, which seems more likely. Whatever caused it, resulted in the affected motor failing. Which came first, the failure causing squeal or squeal causing failure is open to conjecture. Much to my surprise the manufacturer has decided to replace the motor under warranty. In the meantime, the motors I had planned to use originally (2800kV Outrunners) came into stock, so purchased a couple. Until now have had to use the ESC default settings as did not have a programming card. This also arrived with the motors. Following advice from another contributor reprogrammed the motors with “softer” start and acceleration settings. Fitted and tried the new motors and settings. On the bench, the squeal and stutter have almost gone. The motors are also more tractable. As the brushless motors are now going to be used for high speed operation only, with slow on the centre brushed, thought could simplify the controls by putting the brushless ESCs on one control system using a “Y” lead. However, this introduced inconsistent and erratic motor responses. Reverted to the two previous separate controls, port and starboard. On the water the performance is fine, as is the reliability. The 2S battery gave almost half an hours operation. The bow lifts nicely with both 2 & 3 S Batteries; plenty of spray. Hopefully resembling a 50 knot vessel! Another adjustment is needed to the transom flaps to try to hold the bow down later as she accelerates. Feeling now to finally be making progress with this model. The squeal has not gone, nor has erratic motor operation. The squeal is high pitched screech, rather like treading on a budgie! When it happens, bringing the control back to neutral and advancing it again almost always overcomes it. The erratic operation happens also when starting and is rather like the motors are not getting a signal to react to the control. Again, returning through neutral briefly seems to correct it. The revised motors and ESCs have increased the weight to 6lbs for the hull including all running gear, excluding batteries and superstructure. Whilst still trying to control weight have concluded this figure is satisfactory as the performance certainly is.
Decided to separate the two power systems; one to the port ESC and motor and the other the starboard. Hope this will reduce interference between the motor systems. Have also reverted to a remote battery powered Rx rather than the BECC system, again to reduce possible interference. The modifications did not resolve the problems. The squeal and stutter are still present, but much reduced. Sounds rather like a slipping coupling, but as these have been checked many times they can be eliminated. Apart from the squeal and the stutter, everything works well. The squeal /stutter occurs at start up, when it happens the control is returned to neutral, If the motor is immediately reselected, usually the problem goes away and the motor runs up cleanly. It only occurs when both motors are selected at the same time. Either runs up cleanly when selected individually. Interestingly enough, did some research on various Model Boats site and found some references to RF interference, no specific solutions though. Also examined some Aero modeling sites as they use powerful brushless motors with ESCs. There is some history of the problem there. Evidently when the mosfets (?) of the ESCs convert DC to AC, RF interference is generated. It can often be addressed by using ferrite rings on the ESC control leads. My latest ESCs actually have ferrite rings, so the problem must have been anticipated. This might account for the latest reduction in squeal and stutter levels. Am at a loss to think of any other modifications, so decided to conduct a water test. Maybe it is a characteristic of brushless motors, but their control response seems “ragged”, not smooth as with a brushed. Anyway, the squeal and stutter seemed reduced yet again, perhaps the water load damped them down. Was able to start exploring both the performance envelope and the viability of the brushed centre shaft motor. First impressions are that on a 2S battery the performance is fine, but it sparkles on 3S. On 3S the stutter and squeal are more pronounced though. Intend to do further trials but, unless something unexpected occurs, now plan to use 2S power. The centre brushed motor idea works well, this layout seems a good compromise. Will design a simple switching circuit to ensure the brushless motors can selected separately. This will avoid the inadvertent operation of both brushed and brushless unintentionally as they are on the same control stick. The brushed can then be used for low speed operation. Returning to the problem of squeal and stutter – has anybody else experienced this and how was it resolved?
[Score: 5/10] 6"/1000g Huntsman Capable of 6mph and a runtime of 10mins Twin Propellors (4 Blade 20mm) Direct Drive Powered by LiPoly (7.4v) Batteries - Comments: This really is a build project, it is hardly out of the box. It will eventually grace the starboard side davits on Bulldog. However she shall be a fully working boat in her own right, a spin off from the Diana Challenge in a boat mag years ago. More when I get a whole lot more done
I took my Emma out for a second "real" water voyage, tethered of course. Overall I am pleased with my progress. I need a more powerful servo to manage the sails and my rudder mechanism needs to be reworked so that it doesn't bind-up short when tacking starboard. https://youtu.be/_IXdwBZyCqE
OK, you know and I know that this is an Aerokits Sea Hornet, BUT, with a little reworking, it becomes a very passable Chris Craft Special (sometimes Custom) Runabout. One cockpit, long engine deck. I think it suits the Sea Hornet shape and proportions very well. Generally, I think too much is expected to be going on with a basic Hornet and the deck furniture is too simplistic. Also, don't be tempted to call this one a barrel back They had one continuous curve right over the transom from chine to chine, whereas this hull and the Special Runabout had a break, albeit a small one at the deck level. Anyway, I redecked the Hornet with 1/16th" ply, leaving the engine hatch long. I also had to make a small hatch at the stern to service the tiller and its connection. Then I realised I would never be able to get to the two starboard screws that hold the steering servo in, so a wee hatch went in over them too. That will be held in with a small magnet and just popped up from inside the engine 'ole hatch. Because the hull needed filling and various repairs, I decided to paint it, but veneer plank the deck. many Chris-Crafts were painted and I think this one in a nice off-white with a varnished Mahogany and pear deck will look just the job with nickel plated deck furniture, made in brass and nickel silver and plated in nickel to look like chrome in scale. Chrome is a) difficult to get these days and b) too bright and garish on a model. The hull has been epoxied and rubbed down then brush panted heavily with cellulose primer surfacer. This rubs down a treat ready for a sprayed enamel top coat or three. Cheers, Martin
I am after some information on the ELCO 80ft 103 class, I have gathered conflicting data on the positon of the three rudders relative to the propeller shafts. Some say inline, others say outboard of shafts. Port and starboard shafts of early examples were set 47inches from the centre line (keel). The Italeri plastic kit shows them in line. I have seen pictures of a latter boats were the rudders are not directly behind the propellers but not sure about early boats like the 103 class.
If the boat has 2 rudders I usually install the props-clockwise on the starboard side and counter clockwise on the port side. If the boat has a single rudder-clockwise on port and counter clockwise on starboard.I find it produces better control when you reverse.
Evenin' Neville, Yes go for 3 blade cast (not soldered) brass props, one LH, one RH. Jury is still out on which should be port and which starboard😉 Size I'm not sure of, my 28" twin shaft PTB has 35mm props, which I may reduce depending on the sea trial results, so I'd guess your 44" boat may need something larger, perhaps 40-42mm? Hope the drivers of larger Fireboats and such pick this up and can advise! All the best, Doug 😎