Spinner Energy

[blazerbotics]

Spinner Energy

i dont think the traction of the robot has much of a major factor. worst case would be the disc at full speed, being pushed into the arena wall (disc first) by someone like storm.

[Guest]

Spinner Energy

Id have said a spinner being launched into the safety screen disc first.... but then I always was the destructive kind.

[jamesb]

Spinner Energy

I think the point of the traction thing is....
Imagaine hypno on ice (possibly a show there?) its never going to put all the energy in as it skids away.
now nail it (prit stick, blu-tak, whatever) to the floor so it cannot move no matter what, the hits are bigger, so more energy transfer.

the more grip you have, the more energy you can transfer before you are moved away by the impact. the ultimate demonstration of this is vertical spinners that cannot move trough the floor, look what they do!

[Guest]

Spinner Energy

Are we any nearer verticals being allowed to fight at private events yet ?

In the mean-time, dont know if anybody has seen this site but it might be useful.

http://www.teamcosmos.com/ke/ke.shtmlhttp://www.teamcosmos.com/ke/ke.shtml

Paul S.

[jamesb]

Spinner Energy

yike!
thanks Paul, now THAT is a big help!
you seen this Kev?

cheers
James

[craig_anto]

Spinner Energy

yeah thats great well done paul
great link

[terryc]

Spinner Energy

Watch the greatest hits vids, some really nice fight sequences. Great link Paul.

[team_penetrator]

Spinner Energy

great link, now our team know how mush power will be in our disc, its helped us out a lot. Thanks

______________
Carl
http://www.freewebs.com/carls-robot-pagewww.freewebs.com/carls-robot-page

[ThreeFingeredJack]

So this is an old thread which I'm digging up in the aftermath of the recent new series. I've a few questions about vertical spinners which I'm hoping 9 years of experience can answer.
1. Are they legal or not? I'm getting mixed messages across the forum, the "rules" and what I've seen on the show. I appreciate the arena operator has the last say but the TV series was PACKED with spinners which seemed to violate 2 if not 3 of the rules applying to spinners.
2. This energy calculator on the teamchaos site- do they have a version in metric, or at least specifying what units are being used? Has this calculator been proved to work, what margin of error have people observed?
3. Earlier in this thread Richard from 13B appeared to basically justify why spinners should not appear at all...which is concerning. I want one. He predicted the possibility for a spinner to damage the arena and or send shrapnel at polycarbonate piercing speeds. At least one of these came true during the recent series, (see how I avoided the spoiler there), on this note, are they being considered for banning/regulating further to the '3 Rules'?
4. If I went with a 700mm disk diameter saw...that allowed or not? If not technically storing kinetic forces for impact purposes, but instead a glorified circular saw blade...still counts as a spinner, or a saw? Loophole?
5. Anything else anyone can give in terms of advice. Disk-edge mph optimums, material choices (hardox for everything?), motor protection tips etc.

[Garfie489]

1) Spinner Rules are in context of the arena they are run in. Grade 2 and above has no stated limit, other than what the EO sets. Grade 3 is 500rpm, or what the EO sets - best advice is to read the rules carefully and in detail, and learn how they apply to different EOs and events.

2) Its always best to double check your figures from a unrelated source if unsure on the calculation. However that sites confused me aswell as it appears to be american, and thus imperial - yet gives the answer in metric. This is why you shouldnt use imperial for anything scientific :P

3) No, tip speed may be limited by EOs (EO has final discretion and may vary between). However youll likely still get over 200mph before they start getting cautious.

4) There is no difference between blade type, if it rotates its a spinner. Some robots have bars, beaters, ect - they arnt discs but come under the same regulations. Best advice is to not try finding loopholes in the regulations as the EOs will likely see through that and ban it anyway. If your defence is that its in the wording of the rules, tough - they decide if you enter their arena or not.

5) Build it at featherweight scale first. That way you can learn the technology and structural requirements needed whilst also not breaking the bank

[typhoon_driver]

The team cosmos calculator gives accurate figures but they are only as accurate as the info you provide. It's obviously very simple so can't help you with complex curves etc. The most accurate method is to model the spinning mass in CAD and get your moment of inertia from there. Use that with the formula and you will have a bang on answer (assuming you ever reach the rpm you assume).

[john_frizell]

Gary is right but if you are in a hurry and want an approximation, this site helpful: http://www.botlanta.org/converters/d.../flywheel.html