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Re: Team 665 Fan/s and More
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Re: Team 665 Fan/s and More
Back of the napkin tells me that if you're putting out a uniform 28 mph across a 32 inch fan, you'll get around 340 lbf out of it. Anyone want to check my numbers? I guessed on some of my constants - been a while since I cared about air density :rolleyes:
If my numbers are right, conservatively you may get 150 pounds of push out of it. Not too shabby! |
Re: Team 665 Fan/s and More
I do not have a link handy to the rules right now, but i thought somewhere in the rules you could not use a fan of any type to deflect balls that people are shooting at your trailer. So are these aimed sideways or are they aimed front and back?
Like i said i will come up with a quote when i get a miniuite to do so. |
Re: Team 665 Fan/s and More
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Anecdotally, I've dealt with a propeller-based system: a 100 lb model aircraft with a pair of 1 250 W (mechanical output) motors and Ø20 in two-bladed propellers with 12 in pitch. In long-duration maximum-power static thrust tests on the ground (there was resistance at the wheels, but not much), it had between 30 lb and 40 lb of thrust. The blades were spinning at over 6 000 rev/min, and the motors were drawing over 40 A each at 40 V. (The aircraft had a conservative flight duration of around 8 minutes at maximum power. When cruising, it needed far less power than that to sustain estimated airspeeds of 100 km/h.) Incidentally, it's the experience on that project (everyone stayed safe), that fuels my healthy distaste for propeller systems in crowded spaces. |
Re: Team 665 Fan/s and More
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I am looking forward to seeing these fan-bots in action. |
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They better not have the air-intake on the bottom of the robot though..... |
Re: Team 665 Fan/s and More
I'm a big fan of 665...tee hee. Actually I think this is going to be really fun to watch
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Re: Team 665 Fan/s and More
I like how no one is really that concerned about safety here when the guy has his hand REALLY close to the prop, yet when our team posts anything about prop testing, we are continually nominated for the Darwin award XDD
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Re: Team 665 Fan/s and More
his hand is close to the blade but not in the plane of rotation like you guys were. Also there protection around the fan is far superior to the one you have currently proposed. I think people are becoming tired of your blatant disregard for safety. It's ok if you want to hurt yourself, but by not shielding the fans properly you will be putting hundreds of people at risk.
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Re: Team 665 Fan/s and More
I think the safety officails will have fun with this team:rolleyes:
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Re: Team 665 Fan/s and More
I like it, great concept, can't wait to see it in action!
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For anyone interested, we measured the amp draw at different power outputs.. it's about 20 amps on startup, 8-10 amps on 50%-75% speed, and 4 amps at 100% throttle. As far as the safety aspect, the metal for the cowling is only 1/32", so it was fairly easy to bend and make into a circle. Although we are confident that if the blade is to come off and shatter, the cowling would stop or drastically reduce the velocity of any dangerous debris. Since there really isn't any scale, the mesh we have protects against putting fingers in. One girl on our team can fit her pinkie finger in the mesh, but even then it wouldn't be long enough to get to the blade. So we figure a 10 year old won't be able to hurt themselves even if they tried. Thanks for all of the comments and input guys. -Greg |
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