Gearing for 20 FPS?

[Aren_Hill]

Originally Posted by jspatz1

Our 2008 lapbot was geared for 23 fps and had very good acceleration. 4 cims, 70 pounds, 6:1 ratio from CIMs to 6" wheels.
http://www.youtube.com/watch?v=52PxEzpm9Us

I can vouch for that, speedy little bugger

[Ether]

Originally Posted by jspatz1

Our 2008 lapbot was geared for 23 fps ... 6:1 ratio from CIMs to 6" wheels.

That's 23 fps at CIM free speed. Do you know what was the vehicle's actual top speed? (I'm trying to get some data on realistic numbers for speed de-rating)

[Chris is me]

Originally Posted by thefro526

(Though, at 30 FPS, they'd have been running laps in what? 5 seconds?)

You don't need 30 FPS for a slightly longer than 5 second lap without traffic.

Speed Racer, still my favorite robot. A perfect example of KISS. Don't even touch the trackball and score more points than 90% of hurdlers.

[Billfred]

Originally Posted by NuclearNK

I'm no physics buff, and could be wrong, but wouldn't this have a pretty slow acceleration?

I didn't run it that far through--he just wanted 20 FPS, he never asked if he could reach it on a regulation field!

Someone want to channel their inner Mark Leon and do the math?

[ayeckley]

Originally Posted by CNettles11

It wouldn't be practical but it sure would be a fun driving experience.

It would be extremely difficult for a driver to control, which would certainly take some of the fun out of the driving experience (but it might be a good learning exercise anyhow). We learned our lesson the hard way in 2008. The plan was to have a closed-loop control system which in theory would have mitigated the problem, but our wheel encoders were unreliable and we had to fall back on an open-loop approach with disastrous results. YMMV...approach with caution.

[Ether]

Originally Posted by CNettles11

while still having decent acceleration?

Maybe someone's already done this, but here's my quick attempt at the math.

[ks_mumupsi]

btw here is the ackerman module...

http://www.chiefdelphi.com/media/photos/31565