RobotWars101

Can't see any problem with that date Simon. Count us in!

Thanks for a fun day Simon. RONNY performed consistantly - losing absolutely every contest! The last bout vs MilitAnt resulting in another slice through the CF armour and a punctured and destroyed receiver crystal! The next version of RONNY will feature anti-MilitAnt Kevlar-and-Titanium armour... Ra...

Andrew, you are right not to power your Rx off of 8.4V (or 7.2V or whatever...) - it will thank you for it! You can calculate the stall current of a servo motor by measuring its resistance, then calculating I= V/R. For 500mA at 5V you are looking for a resistance of greater than 10 Ohms. I seem to r...

If using servos, then the best way is definitely to use the servo horns! (Unless you fancy making your own splined socket - I didn't think so!) I usually glue the wheel to the servo horn, then drill some holes to match the ones in the horn and put some 1mm copper wire through like a staple and fix i...

Ian, you know as well as anyone that the rules define armour as "A protective layer or skin". If your 2mm metal is armour then it is not allowed by the rules. Adding "a thin layer of plastic" as you suggest would change nothing. The metal would still be armour! Stop sniping at ot...

Ian's figures appear correct, but some of the terminology is a bit misleading. DC motors have a constant relationship between speed and voltage: speed / voltage = K (rpm/volt) So speed = K * voltage If you know the speed at a given voltage you can calculate K and then calculate the speed at any volt...

Both ultrasound and infra-red will work, and transducers are available. You're better off directing this sort of question at the RobotBuilder forum - http://www.robotbuilder.co.uk/forum as there are lots of people there that have done this sort of thing. As Simon says, you need two sensors and a con...

OK, since all the old answers to this question disappeared, here's basically what you need to get started (the conventional way). 27MHz or 40MHz R/C transmitter 27MHz is hard to come by these days, you are better off with 40MHz FM. 40MHz AM is also available, but there's not much of it about , still...

Simon, is the event still on? What's happening? Who's coming? Do you need us to bring any arenas?

Servos are used as a relatively cheap source of small motor, gearbox and speed controller. It is possible to build all this yourself and (theoretically) achive better results. Whilst buying motors and speed controllers is not too much of a problem, gearboxes present more of a challenge. You can buy ...