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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐บ๐ธ subdave ( Able Seaman)
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Here is a short video I did to test the belt drive.
I am using 7.4V and a rubber band for the belt. I will test in in water when I get a proper sized O ring for the drive. ▲
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Remove Ads ๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง jarvo ( Lieutenant)
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Hi Dave, your worries are well founded, they are very susceptible to going astern and following waves, my original one as a kid sank on several occasions. Don't worry about removing the deck, the glue is brittle, go slowly from the middle of the hull and gently work your way round, there will be a little breakaway from the hull edge but this gives you the key to re-sighting the deck, you then get proper access to the inner hull to mount the motors properly
Mark ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐บ๐ธ subdave ( Able Seaman)
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I was thinking of adding access hatches in the rear deck well.
I did not want to risk removing the deck and breaking something. Plus having done this in builds before if you don't get it sealed good you will end up underwater very fast. ๐ฏ Dave ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง smiggy ( Master Seaman)
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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..... ๐ ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง jarvo ( Lieutenant)
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Sound like new shafts and props, lower the shaft angle and 2 x 280 or 380 motors
Mark ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง smiggy ( Master Seaman)
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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 ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง jarvo ( Lieutenant)
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Hi dave, mine takes 4 x c cells, not flat 4.5v going up to 7.2 pack should not be to bad also some weight saving with NiMh
Mark ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง Dave M ( Vice Admiral)
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When I had one of these many moons ago I well remember the hot smell coming from the veritable Mighty Midget motor. I believe it ran on a 4.5 v dry flat pack so you may have a problem with 7.5 volts. The rubber band drive was quite reliable. Sadly lost at sea on a rather windy rough water day in a large deep and dirty pool.
Please share how you fit the servo for the rudders. Good luck Dave ๐ ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐บ๐ธ subdave ( Able Seaman)
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I think I may adapt the if it ain't broke don't fix it saying with this conversion.
๐ So many times I have ripped out the stock motor and added a more powerful unit. This time I think I will try the Mighty Midget and belt drive. I powered it up with a rubber band for now and a two cell 7.4V battery and I was impressed with the speed the props were turning. I have found that powering a motor made for dry cell batteries with a more modern battery capable of supplying more current the motor will deliver more power. I have vet to try an in water test as I know the poor rubber band would not survive. I plan to get a suitable size O ring to use for the drive. It should be just a matter of adding a small ESC and servo for the rudders. I don't want to cut the deck off so this may prove challenging. Still in the thinking stage. Can you smell the smoke. ๐ญ Dave ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง smiggy ( Master Seaman)
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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 ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง Dave M ( Vice Admiral)
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Hi Mark
I have not converted my pair yet but you will note from the above comments that the props are at far too an acute angle. if you fit two small brushed motors you should be able to lower the shafts. The rudders need to be resited and extended above the aft deck and a control rod run down one side. They are v small boats so lots of power is not needed but a LiPo will keep the weight down Good luck and please post your efforts Dave ▲
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Remove Ads ๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐ฌ๐ง jarvo ( Lieutenant)
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Smiggy and Dave, I am also converting both the Fire boat and the Triple screw yacht, looks like a new set of models will set sail, I was looking to use the old rudders with brass tube soldered over the rudder posts with brass tube for the posts. With a micro servo between the tiller arms, lets see if it will fit!!!!!
Possibly with a lipo battery to save weight, maybe brushless motors as well???? Mark ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
8 years ago by ๐บ๐ธ subdave ( Able Seaman)
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Nice build.
I just aquired this model and am thinking of adding RC. Dave ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
11 years ago by ๐ฌ๐ง smiggy ( Master Seaman)
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Hammer, I find it very hard to throw anything away in case it comes in useful. Mind you, finding it again is another matter. ๐ฏ
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. ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
11 years ago by ๐ฌ๐ง AlanP ( Lieutenant)
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That's a good idea smiggy, might pinch it ๐ can I ask what the circle is on the underneath.
Alan ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion part 8
11 years ago by ๐ฌ๐ง hammer ( Lieutenant)
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Ingenuity is what I like, especially using what is to hand. (not spending money). Me being a poor old pensioner. ๐
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๐ฌ Victory Industries Vosper Fire Boat RC conversion
10 years ago by ๐ฌ๐ง smiggy ( Master Seaman)
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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) ▲
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๐ฌ Victory Industries Vosper Fire Boat RC conversion
10 years ago by ๐ฌ๐ง twinkle ( Master Seaman)
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Interesting Project
any update yet ? regards emma ▲
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