Motors In Seat/Down Tubes

[Bret Cahill]

What can the efficiency of a 200 watt motor + reducer be if it's only 1" in diameter?

https://www.yahoo.com/tech/cheat-pros-hide-motor-road-220000777.html


Bret Cahill

 

On Wednesday, February 3, 2016 at 8:07:42 AM UTC-5, Bret Cahill wrote:

What can the efficiency of a 200 watt motor + reducer be if it's only 1" in diameter?

https://www.yahoo.com/tech/cheat-pros-hide-motor-road-220000777.html


Bret Cahill

Pretty efficient if it can beat the power to weight ratio on a racing bike.

 

[Bret Cahill]

What can the efficiency of a 200 watt motor + reducer be if it's only 1" in diameter?

https://www.yahoo.com/tech/cheat-pros-hide-motor-road-220000777.html


Bret Cahill

Pretty efficient if it can beat the power to weight ratio on a racing bike.

A 40 watt magnetic rim motor would be enough in competitive races. They must be looking at all kinds of low power technologies and effects where, say, a paint job doubles as a battery with shifter cables insulated as wires. Maybe a "malfunction" shortly into the race converts an otherwise ordinary looking component into a coil. Just before the finish what looks like the rear brake falls off and disappears into a storm sewer.

Not just the bike but the clothing needs to be checked.


Bret Cahill

 

[John Larkin]

On Wed, 3 Feb 2016 05:07:27 -0800 (PST), Bret Cahill
<bretcahill@aol.com> wrote:

What can the efficiency of a 200 watt motor + reducer be if it's only 1" in diameter?

https://www.yahoo.com/tech/cheat-pros-hide-motor-road-220000777.html


Bret Cahill

People make really tiny, really good motors. 1" is pretty big in some
worlds.

Seems to me that a decent magnetometer could spot a PM motor easily,
even inside a steel tube.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Bret Cahill]

What can the efficiency of a 200 watt motor + reducer be if it's only 1" in diameter?

https://www.yahoo.com/tech/cheat-pros-hide-motor-road-220000777.html


Bret Cahill

People make really tiny, really good motors. 1" is pretty big in some
worlds.

RC helicopter tail rotors have motors 3 mm in diameter. I was stunned that they could get them down that small for a few $/copy.

Seems to me that a decent magnetometer could spot a PM motor easily,
even inside a steel tube.

Some AC motors would require _coil_ detection which may be impossible.

This is a bigger problem than what race officials understand. It may be on par or even worse than drug detection.


Bret Cahill