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Post by Deleted on May 11, 2019 16:13:04 GMT
thanks, there are 2 tapped holes in the MK conical casting that take the long set screws that retain the original motor - I guess you could have used those. I had added to my post before you posted to point out that in this case the motor itself was in the way of using those holes. The original MK armature is quite thin and those bolts go through the gaps between the magnets. the brushless motor I used is thicker than the original MK armature. You could look at using a smaller motor. I'd go for 200kv or less otherwise it will get bogged down. Some interesting options here alienpowersystem.com/product-category/brushless-motors/50mm/Loads of other sizes on that site as well. Mainly aimed at electric skateboard community and bikes. I'm not convinced brushless is better for slow relaxing boats as you do get more noise but its interesting to play with these things and being out runners ie rotating outer shell where the magnets are thereby increasing the ability to provide torque they pack a lot of poke into a small unit. Neodymium magnets obviously. The Tesla model 3 has brushless permanent magnet motor whereas the S and X have the old AC induction motors in them. I know that's not a boat related comment but I still think its interesting. High power to weight and cheap manufacturing.
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Post by Deleted on May 11, 2019 16:28:55 GMT
If you want to get some serious power DIY then pull apart a motorbike starter get the planetary gearbox out adapt it to a fast powerful brushless motor and build it into a waterproof housing then you can extract the full potential of the motor at high voltage.
That's what the krauts have done with torqeedo. But they whine.
If you are like me and prefer a true silent electric motor then do not get a torqeedo or build a copy. Its a cleverly designed product made for people with loads of money and offering them the ability to get the inflatable on the plane without using petrol.
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Post by Deleted on May 11, 2019 18:36:46 GMT
Rummaging through my bucket of random electrical parts I found a 20 amp DC motor speed controller which has this rather pleasant hand held fob the little aerial retracts. Its like a James Bond bomb remote. Its just a cheap Chinese thing nothing special but quite a nice way to control the speed with less wiring. It sends a signal to a little pwm speed controller which is basically a 4x3x2 inch box which can be hidden and waterproofed. The rf will go through plastic and hopefully GRP. "Up" is speed increase "down" is speed decrease. Tested and very smooth. Padlock is off nobody else can use the motor unless they rewire it. Think I'll be using that tomorrow during the trials !! Will take a couple of other pwm units in case of burnouts. Cheap pwm controllers do sometimes have QC issues.
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Post by Deleted on May 11, 2019 21:34:04 GMT
Just came across this interesting unit Vortapower an Australian $$$$ product. Looks like it may be a long brushless inrunner motor mating to a ring gear in the inside of the propeller hub in order to achieve the required speed reduction. Quite a nice solution and possibly a bit quieter than the torqeedo. Not sure if any other consumer products do this. There will be some durability problems. At a guess it is possibly a 56114 motor or similar which can produce enormous power but would need gearing. The fact the motor housing seems offset suggests there is a drive pinion and a heavy duty internal ring gear on the prop hub. alienpowersystem.com/shop/brushless-motors/56mm/aps-56114-inrunner-brushless-motor-rc-boat-13000w/
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Post by bodger on May 12, 2019 7:06:05 GMT
The other option is Kipawa props for Minn Kota. They are quite good. yeah, I have fitted a 3 blade Kipawa, waiting to test it any time soon.
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Post by Deleted on May 12, 2019 11:13:22 GMT
Well I put the motor on. Its not a fast boat I reckon about 2mph at 5 amps but that's ideal for me. Can go faster if needed. Some tests at Cookham reveal range of approximately 3.5ah per mile. Not bad really. Happy with it but the mount needs making better. Works perfectly well but it's a bit obvious I prefer stealthy. Wicked boat
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Post by Jim on May 12, 2019 11:37:40 GMT
Well I put the motor on. Its not a fast boat I reckon about 2mph at 5 amps but that's ideal for me. Can go faster if needed. Some tests at Cookham reveal range of approximately 3.5ah per mile. Not bad really. Happy with it but the mount needs making better. Works perfectly well but it's a bit obvious I prefer stealthy. Wicked boat So wicked it's tipped you over.
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Post by Deleted on May 12, 2019 13:34:16 GMT
So wicked it's tipped you over. I was merely attempting to get naughtyfox involved
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Post by naughtyfox on May 12, 2019 13:44:03 GMT
So wicked it's tipped you over. I was merely attempting to get naughtyfox involved ooh.... stuff of nightmares!
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Post by Deleted on May 12, 2019 13:55:11 GMT
Well I put the motor on. Its not a fast boat I reckon about 2mph at 5 amps but that's ideal for me. Can go faster if needed. Some tests at Cookham reveal range of approximately 3.5ah per mile. Not bad really. Happy with it but the mount needs making better. Works perfectly well but it's a bit obvious I prefer stealthy. Wicked boat You’re wasted MM...well I didn’t mean in that way...but who can tell? I was wondering if anyone had tried to convert a Sinclair C5 into an amphibious vehicle. I mean, did anyone find a real use for it?
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Post by Jim on May 12, 2019 14:06:38 GMT
Well I put the motor on. Its not a fast boat I reckon about 2mph at 5 amps but that's ideal for me. Can go faster if needed. Some tests at Cookham reveal range of approximately 3.5ah per mile. Not bad really. Happy with it but the mount needs making better. Works perfectly well but it's a bit obvious I prefer stealthy. Wicked boat You’re wasted MM...well I didn’t mean in that way...but who can tell? I was wondering if anyone had tried to convert a Sinclair C5 into an amphibious vehicle. I mean, did anyone find a real use for it? Yes, as a garage door stop.
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Post by patty on May 12, 2019 15:00:29 GMT
Well I put the motor on. Its not a fast boat I reckon about 2mph at 5 amps but that's ideal for me. Can go faster if needed. Some tests at Cookham reveal range of approximately 3.5ah per mile. Not bad really. Happy with it but the mount needs making better. Works perfectly well but it's a bit obvious I prefer stealthy. Wicked boat You’re wasted MM...well I didn’t mean in that way...but who can tell? I was wondering if anyone had tried to convert a Sinclair C5 into an amphibious vehicle. I mean, did anyone find a real use for it? Seen it on display in museum so guess it filled a space there
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Post by Deleted on May 12, 2019 19:31:37 GMT
You’re wasted MM...well I didn’t mean in that way...but who can tell? I did have one or two beverages and spent seven hours in the vessel. Having a bit of food now then out again shortly in the thing. I have called it "Laisse les dire" its French. French is always good for boat names. Pronounced "Less lay dear" it means "let them talk". Ideal boat name. Trying to empty the 78ah battery and find more beer ! Only reason for the silly selfie picture was I mislaid my other phone and this one has a broken main camera lens. I hate selfies normally.
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Post by Deleted on May 12, 2019 19:52:24 GMT
You’re wasted MM...well I didn’t mean in that way...but who can tell? I did have one or two beverages and spent seven hours in the vessel. Having a bit of food now then out again shortly in the thing. I have called it "Laisse les dire" its French. French is always good for boat names. Pronounced "Less lay dear" it means "let them talk". Ideal boat name. Trying to empty the 78ah battery and find more beer ! Only reason for the silly selfie picture was I mislaid my other phone and this one has a broken main camera lens. I hate selfies normally. I was really just trying to say you obviously have a gift with building projects.
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Post by Deleted on May 12, 2019 21:24:20 GMT
That little motor would be prime to fit a tiller and make it steeerable! You should make it steerable! You were right about the steering Paddle is okay and I survived about 9 hours today but sometimes a little side wheel for steering would be handy and quite a lot more relaxing to be fair. The thing is that its really handy to have the vertical shaft hinged so it freely rides up if its too shallow and also a blip in reverse kicks it up and throws weed off the prop. So what I want to do is build a mount which has a pinion integrated into it which engages with a pinion on the vertical shaft going to the pod motor. That way you would get steering in ahead as the thrust would mesh the gears. No real need for steering other than when going forwards as the boat glides and the paddle is best option for close quarter manooovering and mooring. I'm going to have a look at nylon gears. Might be quite a nice way to do the steering and quite subtle as well which helps. Some sort of chain or cable arrangement off the pinion which will be built into the engine mount.
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