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gorrilla
23-02-2010, 19:15
[cdm-description=photo]34945[/cdm-description]
gorrilla
23-02-2010, 19:16
Does anyone know how many FPS 21mph is?

We did the calculations ourselves and came out with around 31fps which is unreasonable :confused:
Brown 2010
23-02-2010, 19:18
Does anyone know how many FPS 21mph is?

We did the calculations ourselves and came out with around 31fps which is unreasonable :confused:

30.8 FPS. theres an app for that.
gorrilla
23-02-2010, 19:21
30.8 FPS. there's an app for that.

We did use an Iphone, but 31fps seems like way to much?
Daniel_LaFleur
23-02-2010, 19:21
Does anyone know how many FPS 21mph is?

We did the calculations ourselves and came out with around 31fps which is unreasonable :confused:

21MPH*5280(F/M)/60(S/H)/60(M/S)=30.8fps

Why? Do you believe your robot is traveling that fast?
gorrilla
23-02-2010, 19:23
21MPH*5280(F/M)/60(S/H)/60(M/S)=30.8fps

Why? Do you believe your robot is traveling that fast?

It seem to be.....We measured it with a radar-speed gun, then double and triple checked it...we came out everytime between 20-22mph...

I can't believe it is going that fast, but it does look like it...
db1618
23-02-2010, 19:39
Is it about as fast as Usain Bolt? If so, then that's about right.
JamesCH95
23-02-2010, 19:55
There's no way a driver could handle a robot with that speed... you'd be going end-to-end on the field in less than 2 seconds. Your radar gun clearly didn't work properly.
gorrilla
23-02-2010, 20:56
There's no way a driver could handle a robot with that speed... you'd be going end-to-end on the field in less than 2 seconds. Your radar gun clearly didn't work properly.

That's what I was thinking, but it is incredibly fast, over 20fps. It easily covers our 10 foot square of carpet in less than half a second...
Swampdude
23-02-2010, 21:02
interesting choice to go tiny, got any videos? looks good! say high to all the ex Mars folks for me. See ya all in a couple weeks!
JamesCH95
23-02-2010, 21:36
That's what I was thinking, but it is incredibly fast, over 20fps. It easily covers our 10 foot square of carpet in less than half a second...

Good lord. What's your motor/gearing/wheel size?!
gorrilla
23-02-2010, 22:06
10x 6' plaction and KIT wheels.

2x (12.75:1) ToughBoxes with 4 CIMs.

(roughly) 1.4:1 Chain Reduction
JamesCH95
23-02-2010, 22:17
Let's see... CIM free speed is 5300RPM... I'm assuming 6"(in) not 6'(ft) wheels :p

5300rpm/60 = 88.3[rev/s]...

88.3[rev/s]/12.75/1.4*0.5*3.14[ft/rev] = 7.77ft/s maximum top speed assuming no load, which of course is a bad assumption, so your real top speed will be a little lower. Quick, but not insanely fast.
gorrilla
23-02-2010, 22:27
Let's see... CIM free speed is 5300RPM... I'm assuming 6"(in) not 6'(ft) wheels :p

5300rpm/60 = 88.3[rev/s]...

88.3[rev/s]/12.75/1.4*0.5*3.14[ft/rev] = 7.77ft/s maximum top speed assuming no load, which of course is a bad assumption, so your real top speed will be a little lower. Quick, but not insanely fast.

Ya that makes more sense...We did this after we found 31fps untrue, and we got the same result.

But that still dosent explain how it moves faster that that.....Ill put up a video as soon as it is emailed to me :rolleyes:
AlexD744
24-02-2010, 01:33
Looks like it'll fly through the tunnels and ease over bumps, NICE. :)
artdutra04
24-02-2010, 02:06
10x 6' plaction and KIT wheels.

2x (12.75:1) ToughBoxes with 4 CIMs.

(roughly) 1.4:1 Chain ReductionWith the given information, you should expect to see between 6.5 and 7.0 ft/sec.

In order to reach 31 ft/sec, you would need a final gear ratio between your CIM motors and the output wheels of aproximately 4:1, depending on where in the speed torque curve you would wish to operate at. For comparison, the first stage in the toughbox is 3.57:1.