Aerodynamic battery cut off activation.

[Tman]

Rob,
How about welding a tab down off a hartwell latch.

I was thinking of this at my desk, I am going to play with the idea when I get home tonight.

[Joe Timney]

To make it a pull, just run the cables the other way!

[Plmkrze]

Mount the pull/push handle in a recessed space similar to a NACA duct.

[robfrey]

Mount the pull/push handle in a recessed space similar to a NACA duct.

Too turbulent. Think smoother.

[robfrey]

Rob,
How about welding a tab down off a hartwell latch.

I was thinking of this at my desk, I am going to play with the idea when I get home tonight.

Tman, did you come up with anything?
I was thinking of fabbing a 1.5 wide x 8" long flat rocker rocker switch that would sit flush when switch is in the on position. Maybe I can make the handle part itself extra thick (maybe 3/8" aluminum) so that it can stick up above the body work a bit then be contoured to match the body within a few thou using a flap wheel.

[maguromic]

On our roadster build we are going to use a solid state battery isolator and use a flush mounted push button.  Tony

[JoshH]

solid state battery isolator

Tony, which one?

[manta22]

Why not make the rotary switch lever out of aluminum that is formed into a thin airfoil. It would be at right angles to the body but in the "ON" position it would be parallel to the airflow so its drag would be almost nil. The "OFF" position would be high drag but who cares?

Regards, Neil  Tucson, AZ

[robfrey]

Why not make the rotary switch lever out of aluminum that is formed into a thin airfoil. It would be at right angles to the body but in the "ON" position it would be parallel to the airflow so its drag would be almost nil. The "OFF" position would be high drag but who cares?

Regards, Neil  Tucson, AZ

The problem with this idea is a problem of position. Due to real estate reasons the battery needed to be in the front of the car. Switch should not be positioned in front of the widest part of the car as it will disturb laminar flow. We did not want to run wires all to the back of the car then all the way back up to the front to all the electronics. It is safest if the switch is as close to the battery as possible.

[manta22]

A  small thin airfoil should not disturb the airflowat all....?

Regards, Neil  Tucson, AZ

[jdeleon]

Rob,
http://www.hartwellcorp.com/pdfs/Hartwell%20Corporation%20Brochure.pdf

page 4-6
Should give you a pretty good idea of what I was thinking.

[robfrey]

A  small thin airfoil should not disturb the airflowat all....?

Regards, Neil  Tucson, AZ

Bugs disturb airflow.
Any protrusions at all off the fuselage will create a wake on a high laminar flow body making the whole shape a bit less efficient.

[robfrey]

Javier.  Could I also use this to reset the switch or would this be a one way only thing?

[maguromic]

solid state battery isolator

Tony, which one?

I have the one made by CRATEK http://motorsportcables.com/content/battery-isolation  , but there are plenty of companies that make inexpensive units. Tony

[manta22]

Bugs are not airfoils,  ... at least the bugs that I've seen. 

Regards, Neil  Tucson, AZ