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Search: Posts Made By: Access
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Forum: Racing Forum
11-17-2009, 06:52 PM
Replies: 0
Views: 367
Posted By Access

ISC USR 2009 Report and Videos

I was at the Auto Club Speedway in Fontana over the weekend and took a great deal of video from this event, which I am compiling right now.
...
Forum: Electric On-Road
07-09-2009, 10:42 AM
Replies: 344
Views: 181,162
Posted By Access

Though you have to consider the dynamic of a...

Though you have to consider the dynamic of a race, someone like me will always favor torque (acceleration) over top speed -- provided you have the traction to put that power down. The idea here is...
Forum: Electric On-Road
05-26-2009, 04:07 PM
Replies: 344
Views: 181,162
Posted By Access

Don't forget about ESC 'profiles' or variable...

Don't forget about ESC 'profiles' or variable forward advance algorhythms / parameters. We've seen what a significant difference this can have on dyno tests earlier in this thread. With brushed,...
Forum: Electric On-Road
05-20-2009, 04:14 PM
Replies: 344
Views: 181,162
Posted By Access

I can't really argue with that. We ourselves...

I can't really argue with that. We ourselves know how things should be designed with the laziness principle and it makes perfect sense to us. But business is often a world in itself, businesses do...
Forum: Electric On-Road
05-19-2009, 03:54 PM
Replies: 344
Views: 181,162
Posted By Access

It has improved vastly, I remember when I was...

It has improved vastly, I remember when I was first getting into the hobby, my first brushless controller was a mamba-25 1/18th scale with the original firmware and it cogged like crazy. Other...
Forum: Electric On-Road
05-19-2009, 11:21 AM
Replies: 344
Views: 181,162
Posted By Access

Have you got the absolute latest firmware in...

Have you got the absolute latest firmware in there from castle? There was one about a week or two ago that helps reduce / minimize the cogging and offers even finer tuning for the rest of the setup...
Forum: Electric On-Road
05-08-2009, 06:39 PM
Replies: 344
Views: 181,162
Posted By Access

Yes, the same MOSFETs that do the phase switching...

Yes, the same MOSFETs that do the phase switching can naturally also do the PWM. There are 3 phase wires and the ESC has to be able to connect each of those phase wires (through the digital switches...
Forum: Electric On-Road
05-08-2009, 04:47 PM
Replies: 344
Views: 181,162
Posted By Access

No, I was trying to simulate them in SPICE at one...

No, I was trying to simulate them in SPICE at one time but just couldn't come up with a model that gave me meaningful results (ones that were even close to measured reality). I use the numbers...
Forum: Electric On-Road
05-08-2009, 12:49 AM
Replies: 344
Views: 181,162
Posted By Access

Yes, for power MOSFETs, less Rds-on = more gate...

Yes, for power MOSFETs, less Rds-on = more gate charge, etc. I've designed DC-DC converters with a real measured 92% efficiency and MOSFET choice is critical -- when choosing MOSFETs, you typically...
Forum: Electric On-Road
05-07-2009, 04:28 PM
Replies: 344
Views: 181,162
Posted By Access

Do both motors have the same (fixed) forward...

Do both motors have the same (fixed) forward advance? Can this be changed mechanically for both motors?

Is it possible to graph efficiency either independently or on the right axis (independent...
Forum: Electric On-Road
05-07-2009, 03:18 PM
Replies: 344
Views: 181,162
Posted By Access

For 'soft start', my guess is that not every ESC...

For 'soft start', my guess is that not every ESC has the necessary built-in or dedicated current sensor(s) to do this; they are doing it by using RPM feedback (ie. at this RPM range, only this much...
Forum: Electric On-Road
05-06-2009, 06:19 PM
Replies: 344
Views: 181,162
Posted By Access

Well all I can say is try one or two running...

Well all I can say is try one or two running starts at some arbitrary RPM (if it cannot be measured) and see what happens. If it compares to the data so far then that's that. There's a lot going on...
Forum: Electric On-Road
05-06-2009, 11:38 AM
Replies: 344
Views: 181,162
Posted By Access

I was basing this mainly on my experience with...

I was basing this mainly on my experience with own brushless vehicles, I'm yet to have a vehicle that can't 'get up to (full) speed' in a high-traction environment in 2-3 seconds or considerably...
Forum: Electric On-Road
05-04-2009, 03:30 PM
Replies: 344
Views: 181,162
Posted By Access

The 40C ones? I tested one late yesterday and...

The 40C ones? I tested one late yesterday and also got the best results out of any battery I've ever tested. I wouldn't doubt that right now these are the best batteries out there. I don't think...
Forum: Electric On-Road
05-04-2009, 10:59 AM
Replies: 344
Views: 181,162
Posted By Access

As a general principle, is there a diminishing...

As a general principle, is there a diminishing returns or inefficiency for high power levels, especially at lower RPMs? For instance, at 5000rpm, the strongest profile (3a) produces a little shy of...
Forum: Electric On-Road
05-03-2009, 07:44 AM
Replies: 344
Views: 181,162
Posted By Access

www dot rcuniverse dot com/forum/m_8310589/tm.htm...

www dot rcuniverse dot com/forum/m_8310589/tm.htm

I just added a test for one of those 40C packs, specifically a 'THUNDER POWER RC 3200mAH Pro Race 40C' 2s pack. Best lipo I've tested yet.
Forum: Electric On-Road
05-01-2009, 05:39 PM
Replies: 344
Views: 181,162
Posted By Access

It still won't let me post the URL. I know some...

It still won't let me post the URL. I know some forums don't like you posting the url of another forum they consider be 'competition'.

Here is the measured data. Basically the procedure was just...
Forum: Electric On-Road
05-01-2009, 01:47 PM
Replies: 344
Views: 181,162
Posted By Access

In my tests the "Thunderpower Extreme V2 25C" was...

In my tests the "Thunderpower Extreme V2 25C" was was roughly equal to Hobbypeople's "Impulse Power 20C" brand -- both tested very well.
Forum: Electric On-Road
05-01-2009, 10:29 AM
Replies: 344
Views: 181,162
Posted By Access

Internal resistance is not necessarily a straight...

Internal resistance is not necessarily a straight line, it's affected by the battery's internal temperature and other factors, even if you neglect charge state it is not a straight line. It's just...
Showing results 1 to 19 of 19


 
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