Model Boat Mayhem

Mess Deck: General Section => Chit-Chat => Topic started by: DavieTait on October 20, 2014, 07:42:44 pm

Title: Hmm wonder if all he's doing is stabalising the magnetic field...
Post by: DavieTait on October 20, 2014, 07:42:44 pm

and minimising wobble in the armature so minimising friction/drag

http://youtu.be/5Xv-req4U8U

Title: Re: Hmm wonder if all he's doing is stabalising the magnetic field...
Post by: malcolmfrary on October 20, 2014, 08:23:19 pm

I would say he had been collecting his lubricant from a cattle yard, having followed a bull with a shovel.  Increasing the magnet power will improve efficiency, but I suspect the main effect is that he is simulating a series wound motor - good starting performance but very poor speed regulation if unloaded (goes faster and faster until the loosest rotating bit is launched).  As this BS stirrer is running unloaded, there will be plenty of torque being translated into rotational speed because, being unloaded, there is nowhere else for the force to go.