Heavy Weight Spinners 2011 !!

[dragonmaster_1]

102 cm tip to tip.

[widow_twanky]

Just been thinking about how to get proper speed control of the disc. Had a look at the wiring diagrams for the NCC speedos and was thinking the simplest soultion to get whatever speed you want is to use a simple relay starter on the ignition switch with the speed pot used in fixed position. Obviously a bit of superglue to fix the potentiometer would save an awful lot of potential errors/mistakes. Just seemed a really simple really easy way of doing it and means that the drive doesn't suffer because of a reduced overall voltage to suit the disc.

Quite sure this facility is available on most other speedos too.

Andy

[Metal Demons]

Wouldn't by far the simplest way, especially given that it doesn't take running a speed controller specially for the disc, be to just choose your reduction ratio (pulley diameters, sprocket teeth or whatever you're using) to get the right speed?

That's also easily verifiable when checking the machine over.

[widow_twanky]

Quite sure it would be I was just pointing out that if it's already built like Dragonstrike and SMIDSY that it doesn't take a lot of modifications to get it going slower.

From a personal point of view I'd rather tweak the wiring than anything else.

Andy

[psycho_fling]

you can also turn down the speed down via the spektrum

[graeme]

problem there is if somthing goes wrong with the speed controller and the fets short out then the motor will get full power. So it should be in the rules that you have to limit the speed by gearing correctly or using less batterys.

[robotwars]

Hiya,

I think it will most probably be ...

Speed controller used for powering the disc... ( reduce the risk of contactors welding shut )
Specific motor(s) only allowed.
Specific gear ratio specified ( limiting the rpm )
Specific maximum disc diameter
Specific maximum mass

Of course its not going to be, do the maths and come up with a magic figure, its going to be subjective, we just need to work together and see how it goes.

I think ill propose to run a spinner in a very downgraded setup to see results, maybe even outside of an event in the summer. We can then come up with the magic figure.

Like i said, i have been very impressed with the input, and we already have some volunteers, plus 4 teams wanting to build something, so after RIAT we can get on with it.

John

[james...venom]

Its great to think of new ideas and trying to get spinners back however call the competition what you like a spinner is a spinner and it doesnt go well with net roofs.

[typhoon_driver]

I would concur on that point made by James. After doing archery for many years I know that a sharp arrow weighing 100g tops will quite happily pierce and go through a heavy archery net at the back and the arrows weren't travelling anywhere near as fast as some parts that fly off bots.

A composite type arrangement might work though, a thin plastic such as HDPE or polycarb (2mm) to take the main bite from the projectile and then a net over the top to take the flex, catch the piece and hold it in place.

It is a tricky one but you will never go wrong being too safe and careful

[anukhet]

I also concur - having been hit by a bolthead that went clean thru a substantial net roof and hitting me standing some 20m away from an arena leaving a mark on my leg thru my jeans I am certainly unhappy with anything less than a grade 2 arena.