My team is running 4:5 ratio blue motors on 3.25 would this be viable?
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It depends on a lot of things, but as a blanket statement it is viable.
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Yes, a 480 rpm drivetrain on 3.25 inch wheels is viable for this game. I asked the same question LOL and was told we could do it. Parts are coming on Monday and I am going to measure if we can get to top speed and the acceleration of the drivetrain if you want.
That is called 480 on 3.25’’ wheels in normal VEX lingo.
However, that is 81.66 in/sec, which is considerably faster than most drivetrains. Most drivetrains this year hover around 65 in/sec. It is viable per se, but it is extremely fast and hard to handle (and has lower torque, so you’ll be losing pushing battles).
I would instead recommend 4:6 (48:72) on 3.25" wheels with 600 rpm motors (68 in/sec), which is slightly faster than average this year and is easier to control.
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I wouldn’t be so sure about your statement of it being faster than most, looking at plenty of signature events, and observations from local competitions (IL).
I can say that 400rpm is definitely on the slower side this year, in my opinion, this might be the first time in a while that 360 on 3.25 is not fast enough to be considered competitive( talking about 3.25 wheels).
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I would look at this forum page for information about drive train ratios and wheels.
Generally for this game ive seen robots have around mid-60s and above inches/second drive trains. You can convert to inches per second by calculating your rps (rotations per second for your wheel, then multiplying that by your wheel circumfrence).
However be wary that the faster a drivetrain is the more skillful your drive will have to be to deal with the high accelerations.
If you want a recommendation, try 450 on 3.25". Our team ran that for our early season robot and it ran quite well.
What motors would you think is best to use on a basic like drivetrain
I would say blues if you have them, geared down. However, you can always gear up greens if you don’t.