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21.5T Brushless versus Silvercan

2012 proved to be a succesful year with 50 racers joining. With basic philosophy:

  1. Must be encouraging for new racers to join.
  2. Realistic speed. Rookies can easily manage. Spectators can easily watch the racing action.
  3. Cheap racing. No to powerful batteries, power capacitors, exotic foam tires.

The basic power package to comply with above is max 50c batteries and 540 silvercan motors (found in rc car kits). How it fared:

  1. We had 15 newbies join.
  2. Speed is realistic, slow enough for beginners and fast enough to excite veterans.
  3. Cheap. Silvercan and TEU104 esc comes with kit or will cost P1,300. Most racers already have old esc and motors laying around the house.

There are some requests to allow brushless motors. While continuous improvement is good, let us see if brushless passes the 3 criterias stated above.

1. Must be encouraging for new racers to join.

Feedback I get from rookies is that they prefer silvercan as brushless systems (around P4,000) is expensive. It is also discouraging to join if one needs to buy a brushless system from overseas as there is no local supplier.

2. Realistic speed. Rookies can easily manage. Spectators can easily watch the racing action.

21.5T (1800kv) will most probably pass this criteria while 17.5T (2200kv) will probably be too fast.

3. Cheap racing. No to powerful batteries, power capacitors, exotic foam tires.

Brushless is 2x to 7x the initial cost of silvercan.

As to running cost, brushless will be more expensive as racers continously buy the "motor of the month" in search of the fastest 21.5T motor.

And finally, there is the issue of tech inspection. While it is easy to tech inspect silvercans (fixed timing, sealed endbell), teching brushless motors is practically impossible for club racing (time constraint, to many variations, timing is adjustable).

21.5T Brushless Motor versu Silvercan

For those who would love brushless, please consider above issues. Brushless fails on 2 of the 3 criterias of the F1RC Club (for now) and introduces issues on tech inspection and cheating.

But if a proposal can be put forward where all these issues are addressed, please do let me know.

Thank you.

Joel

P.S. Apart from theory, let me share some developments worldwide.

New Zealand (NZRCA) - They have been running silvercan in F1. In 2011 the clubs voted down 21.5T.

RC Crewchief Software

Using a software, here are the theoretical comparison of a Tamiya F104 running silvercan versus 21.5T brushless. While the 21.5T has less rpm, it has more torque and power. Click on images to enlarge.

540 Silvercan versus 21.5T Brushless motor

But when it comes to simulating an acceleration run in a Tamiya F104 with fixed FDR of 3.72, the 21.5T brushless accelerates harder and faster. And with JP Raceway straight estimated at 30 meters, the brushless will theoretically beat the silvercan.

Tamiya F104 Silvercan vs 21.5T Brushless motor

But that is theory. Waiting for real life testing.

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