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Forum: General Discussion 07.31.2012, 05:52 PM
Replies: 27
Views: 17,709
Posted By Thomas
It's a student design competition, so you would...

It's a student design competition, so you would have to be a student. Me personally, I was studying mechanicl engineering at ETH Zurich. Actually, I graduated last year and am not part of the team...
Forum: General Discussion 07.29.2012, 05:26 PM
Replies: 27
Views: 17,709
Posted By Thomas
This year, AMZ Racing (http://www.amz.ethz.ch)...

This year, AMZ Racing (http://www.amz.ethz.ch) built an even faster electric FSAE car: umbrail. It has two student-designed motors with 40 kW each, 5 kWh of LiPo batteries, a complete aero package...
Forum: General Discussion 07.29.2012, 05:17 PM
Replies: 143
Views: 53,008
Posted By Thomas
I went with a 9C direct drive BL hub motor and 40...

I went with a 9C direct drive BL hub motor and 40 A controller from Grin Technologies in Canada (ebikes.ca). Their customer service has been great and the cycle analyst is very useful (low voltage...
Forum: General Discussion 05.02.2012, 06:13 PM
Replies: 143
Views: 53,008
Posted By Thomas
Hi there, I'm planning to convert my bycicle to...

Hi there,
I'm planning to convert my bycicle to an e-bike with a direct drive rear motor, 12s LiPo. I believe my bike has a 28" wheel (not sure to be honest, tire says 28x1.40, but is that a 28"...
Forum: Brushless 07.08.2011, 05:18 PM
Replies: 23
Views: 9,201
Posted By Thomas
I had a race last weekend and was using my new...

I had a race last weekend and was using my new Fullymax 3s 2600 mAh 35C (two in series) along my Kokam 3s 2500 mAh 30C. I'm able to get 15 min of runtime, but it depends on driving style. Top speed...
Forum: Brushless 07.08.2011, 04:57 PM
Replies: 57
Views: 21,434
Posted By Thomas
You are comparing two setups. Do the batteries...

You are comparing two setups. Do the batteries have the same C rating and the same amount of energy content (say, same peak power)?
Forum: Brushless 06.11.2011, 06:26 PM
Replies: 57
Views: 21,434
Posted By Thomas
I totally agree. Further, to be completely fair,...

I totally agree. Further, to be completely fair, you would have to use different ESCs for the different voltages. The setup with lower voltage could do with FETs for lower voltage, but needs more of...
Forum: Brushless 06.08.2011, 06:16 PM
Replies: 57
Views: 21,434
Posted By Thomas
What exactly is your point against a 1/10 with 4s...

What exactly is your point against a 1/10 with 4s or a 1/8 with 6s? There are small car ESCs for 6s, there are appropriately-sized motors with <2000 kV and there are 30C LiPos with <3000 mAh.

I...
Forum: General Discussion 06.08.2011, 05:45 PM
Replies: 13
Views: 5,210
Posted By Thomas
I'm rather sure it's an early Hotbodies Lightning...

I'm rather sure it's an early Hotbodies Lightning buggy. Not sure if it holds up to much abuse, it's more of an entry model than for racing.
Forum: Brushless 06.04.2011, 07:06 PM
Replies: 23
Views: 9,201
Posted By Thomas
Looks nice. Wow, that front shock tower is beefy,...

Looks nice. Wow, that front shock tower is beefy, about 4 mm? What kind of setup changes did you make? If that is a CFRP chassis, you might have raised the CF quite a bit, which increases roll.
You...
Forum: General Discussion 05.31.2011, 05:47 PM
Replies: 143
Views: 53,008
Posted By Thomas
I was just wondering if it's a good idea to...

I was just wondering if it's a good idea to convert a human-powered bike to a hybrid electric vehicle by putting one of those hub motors on the front wheel. That would avoid any problems with the...
Forum: Brushless 05.31.2011, 05:32 PM
Replies: 23
Views: 9,201
Posted By Thomas
It weighs 3430 g ready to run, compared to my...

It weighs 3430 g ready to run, compared to my nitro S3 which is 3560 g with empty tank. 51% of the weight is on the rear tires, left/right is <1% off balance (at least my measurements said so).

I...
Forum: Brushless 05.27.2011, 04:43 PM
Replies: 23
Views: 9,201
Posted By Thomas
I'm wondering if efficiency is going up with 0°...

I'm wondering if efficiency is going up with 0° timing or if there is an optimal spot for my motor. Torque and speed are plenty, so I'm not looking for best power, but highest efficiency.
As said,...
Forum: Brushless 05.27.2011, 05:46 AM
Replies: 90
Views: 31,885
Posted By Thomas
Nice build, I like the appearance and the layout....

Nice build, I like the appearance and the layout. Do these rallygame bodies require a longer wheelbase than 1/8 offroad or are they the same?

Personally, I would place the batteries as close to...
Forum: Brushless 05.26.2011, 05:19 PM
Replies: 23
Views: 9,201
Posted By Thomas
Hi Yes, I made them myself, at the...

Hi

Yes, I made them myself, at the university where I study. I used carbon prepreg, in this case twill with roughly 200 gsm. For the battery trays, I used a positive mould (plug) made of wood,...
Forum: Brushless 05.26.2011, 04:23 AM
Replies: 23
Views: 9,201
Posted By Thomas
Hi Thomas Yes of course, here you go. ...

Hi Thomas

Yes of course, here you go.

Buggy: Very old TTR S3 EB4 with an aftermarket flat chassis plate
Motor: Tekno Neu 1509/2y/f (1820 kV)
ESC: Mamba Max Pro
Batteries: 2x 3s1p (-> 6s1p)...
Forum: Brushless 05.25.2011, 06:11 PM
Replies: 23
Views: 9,201
Posted By Thomas
I thought this thread needs some more pictures....

I thought this thread needs some more pictures. Here she is just before the shakedown today:
Forum: Project "X" 05.25.2011, 05:23 PM
Replies: 24
Views: 15,933
Posted By Thomas
Nice idea and execution. Your layout and...

Nice idea and execution. Your layout and powertrain are very similar to mine, I just didn't make a new chassis.
I would definitely recommend some sort of battery holder, which keeps them from moving...
Forum: Brushless 05.25.2011, 05:01 PM
Replies: 23
Views: 9,201
Posted By Thomas
Thanks for the links. There are some pretty light...

Thanks for the links. There are some pretty light BL buggies out there. My goal was choosing lightweight powertrain components, not just saving weight by using carbon etc.

I have achieved the...
Forum: Brushless 05.15.2011, 07:25 PM
Replies: 23
Views: 9,201
Posted By Thomas
Lightweight 1/8 buggy project

Hi there

I am finally converting a 1/8 nitro buggy to electric with the following goals:

Lighter than nitro original
At least 15 min runtime going the same speed as nitros on (European...
Forum: Castle Creations 05.15.2011, 05:50 PM
Replies: 4
Views: 2,657
Posted By Thomas
It would be even better if the switch wires...

It would be even better if the switch wires didn't transmit power, just the signal, and "open loop" was "ON". Thus, you could simply cut off the switch and a broken wire would not shut down the ESC.
Forum: General Discussion 05.04.2011, 04:25 PM
Replies: 27
Views: 17,709
Posted By Thomas
For our new car Novena, we have developed and...

For our new car Novena, we have developed and built two brushless outrunner motors which produce well over 30 kW and weigh roughly 10 kg. The batteries are 36s4p LiPo with 13.5 Ah each. The gearbox...
Forum: Castle Creations 08.20.2010, 04:41 PM
Replies: 46
Views: 18,170
Posted By Thomas
Last year, I was asking for 30S 500 A controllers...

Last year, I was asking for 30S 500 A controllers for our FSAE car http://www.rc-monster.com/forum/showthread.php?t=17955&page=2 Castle didn't have any, so we had to go with Kelly.

The max motor...
Forum: Castle Creations 08.20.2010, 04:21 PM
Replies: 27
Views: 6,839
Posted By Thomas
Don't forget to let us know if the new controller...

Don't forget to let us know if the new controller is working for you. Or if you solved the problem otherwise.
Forum: General Discussion 07.23.2010, 03:58 PM
Replies: 27
Views: 17,709
Posted By Thomas
Last weekend, we won our first competition at...

Last weekend, we won our first competition at Silverstone. We were almost as fast as the best combustion cars. Has some problems with the controllers, top speed was limited to about 80 km/h.
You can...
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