X-Mozilla-Keys:                                                                                 
Rodger Hilyard wrote:

Paul wrote:

I updated this drawing with a skematics of how to connect it
to a hand held VOM/Counter combination.

Four or more of these can be used with a $5 selector switch.
One can select them one at a time to check the air flow
distribution through the rad.

  Of course you could use a hot wire / low drag probe, sorta
like most other investigators use.

  Something along the lines of the GM mass air flow sensor of
the mid 80's, (minus the flow tube.)

  Then you will not need to account for the flow blockage of your
probe, in your data reduction. ; )

Rodger

That is true Rodger but I think the amplifier and calibration
required for a hot wire is beyond most home builders. The beauty of
the new Hall sensors is everything is built in and it is
a digital device that reads out the RPM of the fan. In fact some now
on the market don't need a magnet and they can "see" the teeth
on the starter ring gear for example. Could be used to trigger
the ignition pulse.

Paul Lamar
 
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