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-   -   Fans for defense (http://www.chiefdelphi.com/forums/showthread.php?t=76375)

ScottOliveira 03-04-2009 14:07

Re: Fans for defense
 
Quote:

Originally Posted by boomergeek (Post 845164)
We used FP motors and followed 1771 recommendation on the nuances of the shroud shape: We could push any bot. We put our fans on a turret and varied them between 75% and 100% power in our final two matches. The fans properly used have a dramatic impact. I have no concept of how an expert driver could possibly avoid a pin unless she/he gets their alliance bot to run intentionally run interference: we were faster, more manueverable and could push stronger.

If I could start over, then I would recommend a 4 wheel drive train and at least 15 lbs of thrust from four fans on a turret. Turn it into Sumo bot wrestling. Easy pushes and excruciatingly long pins in front of alliance human shooters.

I might even throw in a compressor/tubing and solenoids to rapidly puff air to keep the traction wheels and the regolith in front of them free of dust to improve traction. Ball manipulation would be completely optional/superfluous.
:P
http://www.chiefdelphi.com/media/photos/33618



Interesting idea with the turret. Out of curiosity, what kind of turning speed do you have on it, and what angles can it reach? Is it a fully rotational 360, or do you have a limit on it? Also, how high do you have the turret mounted? While it doesn't matter quite as much with the trailer, I would think having rotating fans set up high would create a tipping hazard.

And that's an interesting idea about using a compressor to puff air in front of the wheels. Has that been tried by anyone? I'm curious about what gains you would see from that.

boomergeek 03-04-2009 16:15

Re: Fans for defense
 
Quote:

Originally Posted by ScottOliveira (Post 845406)
Interesting idea with the turret. Out of curiosity, what kind of turning speed do you have on it, and what angles can it reach? Is it a fully rotational 360, or do you have a limit on it? Also, how high do you have the turret mounted? While it doesn't matter quite as much with the trailer, I would think having rotating fans set up high would create a tipping hazard.

And that's an interesting idea about using a compressor to puff air in front of the wheels. Has that been tried by anyone? I'm curious about what gains you would see from that.

The turret (powered be the mabuchi) could go about from -135 degrees to +135 degrees in about a 1.5 seconds. The fans are centered about 48 inches off the ground and overall we had a very low (and very central) center of gravity: there was not any tipping danger in our configuration.
The trailer and the rectangle wheel base makes it difficult to envision a significant tipping danger.

I have not seen the compressor puffing tried, but I saw one team with paint brushes to clean wheels and another team that won an award at the Connecticut Regional for an innovative way of keeping their wheels clean (I did not see or hear about their actual configuration). Those teams got me thinking: why not clean the wheels and the path at the same time for even better results.

Keeping the dust off wheels definitely helps with traction especially after the crater has been used a few times. Cleaning wheels between matches certainly helps.

We aren't going to nationals but its hard to ween myself off this challenge.:o


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