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  1. C

    build your very own Lebowski controller !

    Hi Lebowski, Great to see V2.7 out. Just wondering if it's possible to get live data out of the controller? And if so, what parameters? Additionally, myself and my brother will be in Switzerland in December and would love to meet you if you're around. Cheers, James
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    731 km per kWh !!! (1.37Wh/km)

    My team unfortunately isn't able to compete in the Shell Eco-marathon as we're not an education institution but as of last week we managed to achieve 4.4 wH/km doing 45 kph (29 mph) and still have a few more improvements to come. SFCuCB3TuH8 I don't think we're going to be able to get down to...
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    731 km per kWh !!! (1.37Wh/km)

    That's amazing!! I thought I was doing well with 5wH/km :/ Shame about the lack of documentation although I understand why they wouldn't want to share all their secrets, there is a lot of money involved in eeking out the last few wH/km of efficiency. There is quite a lot of info available in...
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    Turnigy 9225-90 Motor Specifications

    Thanks Miles, I've fixed it now :)
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    Turnigy 9225-90 Motor Specifications

    Update: Well we've now had the motor on the car for the last month or so and it's performed pretty well in the tests we've conducted. It does get rather hot under acceleration but we have a computer fan sitting behind the motor bracket I constructed that cools the motor. Unfortunately we...
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    Coast and Burn (Pulse and Glide) Calculator

    Hi Hyperion, Sorry for the very late response, I've been rather busy lately. In my experience, due to the Prius being an automatic, when you're slowly decelerating in the Prius on the highway you are still actually consuming fuel unless you put it into engine braking mode. I.e. if the energy...
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    Controlling a Castle Creations Controller via PC and Arduino

    Update: We now have the Castle Creations Controller writing out all variables to an Arduino. Watch this space :)
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    Choosing efficient motor + battery combination

    Had a quick read of the Lightcycle Thread and I agree with the belt slip issue. One of the biggest problems is getting the right reduction for the track. In 2013, we had a DC motor with a fixed reduction (i forget what it was but it got up to 40 kph on the flat....). That got us 2nd or 3rd...
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    Choosing efficient motor + battery combination

    Hi SaladFish, We've competed in this competition for the past 3 years flying all the way over from Western Australia. Last year we came 3rd in the race and set the Pole Lap. Check out our bike build on Facebook if you like. We won't be competing this year so happy to help you. It's a hard...
  10. C

    build your very own Lebowski controller !

    Hi Lebowski, Majorly impressed by your controller! Only wish I'd known about it a few months ago when I was in Switzerland (I'm live in Perth, Western Australia). Just wondering what components I would have to change in order for your controller to work at 30V min, 55V max as I see you are...
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    Controlling a Castle Creations Controller via PC and Arduino

    We (Coulomb Motorsport) have been using a Castle Creations HVF160 on our competitive E-Bike since early 2015 and on our electric efficiency car since October 2014. We first obtained the HVF160 in mid 2014 and have been working ever since to try and decode the Castle Link Live Protocol (which is...
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    Turnigy 9225-90 Motor Specifications

    Drewjet, I've had a watch of some of your electrathon videos. Very cool! I'm seriously considering building a Lebowski V2 controller without the hall sensors or putting some sensors in and running it sensored so I no longer have to worry about the start up. Going to do another efficiency test...
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    Turnigy 9225-90 Motor Specifications

    @Miles, thank you so much for the effort you've put into that motor comparison. Fantastic to see the different options. Really appreciate it! @Drewjet, we've always run our motors sensorless as we use sensorless controllers. To help initially we usually push off on the e-Bike which is fine as...
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    Turnigy 9225-90 Motor Specifications

    Yeah that's the goal. I was using the motor efficiency calculator here http://www.bavaria-direct.co.za/constants/ (bottom of that page) with the most accurate values I could find about different motors to determine the efficiency. Our Cd is about 0.24 and FrontalA is 0.35 m2. At 40 kph, our...
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    Turnigy 9225-90 Motor Specifications

    Hi Miles, Our electric efficiency vehicle uses around 900Watts to accelerate it to it's cruising speed of 40-45 kph, once there it really only consumes a few amps. The decision to go for the 90 kV 9225 are as follows; - We have a fixed battery voltage (10S LiPo) so lower kV means lower gearing...
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    Turnigy 9225-90 Motor Specifications

    Here is a short video of the first bench test of the motor: https://www.youtube.com/watch?v=OYUR-T0EoE4 No Load Current more than specified on Hobbyking but not substantially more, especially given I was running it at 32V and they test no load at 10V. Additionally here is the code for the...
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    Coast and Burn (Pulse and Glide) Calculator

    Hi everyone, Here it is, a reasonably quick explanation of how I designed the calculator and how it works in the excel sheet. https://www.youtube.com/watch?v=GQp0u5-NE6I Also here is the most up to date calculator: Thanks again for all your help so far. James
  18. C

    Turnigy 9225-90 Motor Specifications

    Hi all, So I've just had my new motor arrive, a Turnigy 9225-90 kV motor which is much smaller than the previous motors used (Rotomax 50cc and SK3-149 kV) and will help me reduce my iron losses. Here is a short video of the motor unboxing, some specifications and a partial disassembly of the...
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    Coast and Burn (Pulse and Glide) Calculator

    Hi everyone, Firstly thank you for all the replies and the discussion. I've been traveling the past two days, only just getting home in Western Australia after studying and visiting friends in Europe for the past 4 weeks, and it's nice to get home and see some good discussion. Thanks eTrike...
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    Coast and Burn (Pulse and Glide) Calculator

    Thanks Teklektik, I'll fix that. Also, I only just realised I omitted velocity from the power calculation for rolling resistance in the Constant Speed section. Makes a big difference. Note, velocity is omitted in the Frictional Drag section for the coasting because it's the Force in Newtons not...
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    Coast and Burn (Pulse and Glide) Calculator

    Only got a bit of time to write more on the calculator so I'll write about the easiest part which is Calculating Constant Speed Strategy Energy Usage: Calculating Power needed to maintain constant speed: Very similar to the equations above regarding Force needed to overcome Frictional Drag and...
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    Coast and Burn (Pulse and Glide) Calculator

    Teklektik, thank you for the advice. I guess I didn't really make it a question but your response and advice is the exact reason I'm posting the calculator and the process used to achieve it's results on here. I'm not brilliant with maths but see massive value in being able to calculate the...
  23. C

    Coast and Burn (Pulse and Glide) Calculator

    So after a few hours of work, I've come up with the following calculator on excel which I'll explain in this post. I have a feeling that I've forgotten something because although the results make sense with an electric vehicle (given the high efficiency of electric motors), it's saying that it's...
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    Coast and Burn (Pulse and Glide) Calculator

    Hi all, So my brother and I are from Perth, Western Australia and we have been building electric endurance vehicles in our garage since 2009 when I was 15 and he was 11. We've now built Australia's most efficient manned land electric vehicle, which achieved 131.7 km/kWh (on a very windy day)...
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    Turnigy Rotomax 50cc Disassembly

    Yeah we did. My brother and I formed our team to compete in endurance events in Western Australia and then in New South Wales (3200 km away on the other side of Australia) in 2009. Because we have to lower our weight, frontal area and CoEfficients of Drag and Rolling Resistance to achieve the...
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