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    Smoothing stator for air flow 20kw GM HPM-20 motor

    This could be completely the wrong idea but I have a Goldenmotor HPM 20kw motor that i am playing with. I have pull the motor apart and vented it in different areas to introduce fresh air, also going to have a suction fan working hard to pull the hot air out of the motor. One area i have been...
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    Goldenmotor VEC500. Insides + mod help

    Hey all, I have started buying a bunch of Goldenmotor items to play around with a just generally test out because i think they have the potential to do a lot better then they currently are speced for and are been used for with some simple modifications. One of the main things i have been...
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    How high a voltage would you go?

    I am looking at building a composite full suspension bike based around a mini-monster. The frame work is probably going to be a mix of Polypropylene honeycomb, fiberglass and Kevlar. With playing around with my motorbike and the green bike its pretty easy to get stray power going thru the...
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    Controlling a Catamaran with RC Radio

    A friend has a small house boat built on top of a 5m catamaran hull that he wants to electrify with twin motors. One of his major things that he wants is to be able to remote control the house boat so he can sit where ever he wants to navigate it slowly down the river. Atm the boat will be...
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    Roller bearings vs Ball in outrunner

    Would there be much of a problem with using roller or even needle bearings in atleast one side of a hub motor mounted to perform mid drive? Idealy i would like to use rollers on both sides of the motor as from what farfle has had to do with his motor and how the chain side bearing on the motor...
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    Feeding hot water pipe do 50mm PVC

    Hello, I have a project i am working through to promote to my work. We currently have a out door pool that is sitting at 16-18 degrees Celsius during winter. Its meant to be a Luxury hotel with a heated feature pool at 26 degrees. We currently use a gas heater to run everything and even...
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    Dual sport bike using a Hubmonster motor Video pg3

    Been toying with the idea of doing a full road legal motorbike for a while. Since i finally managed to sell the Green-monster E-bike i decided it was time to make it into a real thing. I started looking around for a light weight sports bike to convert as i wanted it to be fairly aerodynamic...
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    Testing 43AH Lipo battery cells

    I have recently imported a sample of 43AH 3.7V lipo. The cells weigh 1.11kg. 220x230x12mm. 5C cont and 10Cmax. Going to try and use them once testing prove that they are worth it to build a electric motorbike or 2. :twisted: Anyone have any particular tests they recommend for large...
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    Over running a brushless hub motor

    I have been thinking about doing a motorbike build with a hub motor mounted normally with a 2nd motor, driving a chain powering the hub as well. Due to voltage limitations the top speed is borderline to what i want. My question is can a hub motor be over run by 20% even with the controller at...
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    Chopper bike with 93% eff motor

    Hey guys and girls, A while ago i bought one of the 93% efficiancy motors that John from CR was selling and i decided to mod it out to a reasonable level to allow me to push alot of power through the motor. Along with that i had a sample cruiser/chopper/lowrider bike that i imported from china...
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    Chain drive 9C high current high speed

    Hey guys, I have a 9C hub motor setup running a chain drive to a Nuvinci hub, i recently replaced a hall sensor that had been faulty and now i have it running. Only problem is i have tried a few different hall and phase settings but i seem to be getting some weird results, well to me at...
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    93% efficiant motor pulled apart

    HELP!!! I decided to get some machining done on the motor the John from CR is selling to allow me to use it to its full potential so atm i am trying to find the best solutions to some problems. I have a friend who is very skilled at lathe work(his daily job) so i am going to get him to perform...
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    CA120-70 KV150

    I am looking to buy 2xCA120-70 KV150 for use in a go-kart and at the moment HobbyKing is charging a fortune for them, the manufacturer of the motors does not reply to emails about individual purchases and i have been unable to find anyone else who stocks them. Skyhobby does not stock them but...
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    Taiwan Mid drive, CX motor

    Hello, I have been looking around for a fairly well build mid drive system for me to sell to friends on the Gold Coast. I don't want to push much more then 1kw into it, normally only the ~200W, and i want it to be silent and no fuss. I recently found this company that from what it looks like...
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    Help, what type of motor is this?

    Hey guys, I was asked by a friend to increase the power to a motor he had, i had a look at the controller and it was only rated for 16V caps so i said i would replace it with a brushless controller i had and increase it to 36V as he wanted to go 2x as fast compared to his 12V lead system was...
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    Hall throttle adjustment with pot?

    A quick question for the electrical gurus, if i put a liner potentiometer in line with the signal wire going from my hall throttle to the controller can i use that to roughly set the max speed the controller will let the motor go? Essentially tricking the controller into seeing the throttle...
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    Outdoor chair to full suspension bike

    So i had some outdoor chairs i had to throw out, they were good quality mild steel and had lasted 10yrs with out dying so i thought what can i do with then rather then throwing them out, then i found a full suspension crappy bike to start with..... so i started building a bike i have wanted to...
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    LED rechargeable Tea lights

    Hey guys and girls, I work in a hotel as a Maintenance officer(glorified Handyman) and they have asked me to get some prices and recommendations for LED rechargeable tea lights to use in the Spa/Massage/Relaxation area. They currently use 120odd normal tea light candles that they change 2x...
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    26" rim onto 21" motorbike wheel

    Hey guys, I have a E-bike that i have been using a Pitbike front end for with a 21" motorbike wheel. I recently got tired of all the extra weight so i decided to removed the steel motorbike rim and motorbike tire and they together weighed about 7kg+ to replaced them with a normal double wall rim...
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    Reprogrammed 6fet stalling

    Hey guys, I recently bought a pair of 6fets from Lyen, they work perfectly out of the box on my 9C but they were not programmed for 72V and high power and would trip out by hitting the current limit, so seeing as i ordered them with the programming leads and everything i grabbed my laptop and...
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    Joining odd lipo packs

    Hello, I have 3x 6S 17AH battery packs, most of the time recently i have been running just 2 packs on my bike but i currently need some more range and my controller maxes at 60V or so. The question i have is can i join 2 packs in parallel and then 1 in series, 6S2P+6S1P to make a overall pack...
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    Slight OT- AC in a boat.

    Hey guys, One of my mates has a boat, a old fishing trawler with a concrete hull that he has converted to a live in boat. He is having trouble with the boat heating up alot during the day, outside air temp >32 degrees celcius and inside getting to like 35+. Humidity is very high, on the Gold...
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    Gearbox from monster truck.

    Anyone ever use a HPI racing moster truck gear box, they come in both 2 and 3 speed ones from what i can see, from the supplier the new 3speed ones are like $130 complete, $90 in kit. These trucks run on a 2.9hp engine, do you guys think that the gearbox would handle 2-3kw? or even anything...
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    Solving motor faults- Halls and controller checked

    Hello. My Golden hub motor stopped working properly last night, ridding along all good and then started to slow down and the controller went into safe shut down. Stopped the bike, wouldnt start from dead stop but if i was moving alittle it would go up to about 5km/h then cut out again, slightly...
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    Beach Cruiser + Pocket chopper + Hub

    Ok, The friction drive i built worked, got me to work and back a number of times and gave me my first taste of the EV grin. Simple to build and once working properly was reliable, but the way i did it with old parts it was noisy, bike chain running at high speed is very loud. Play time over i...
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