Robert Bonomi wrote:
In article . com,
Robatoy wrote:
On Oct 23, 8:04 pm, (Doug Miller) wrote:
In article , Tom
Veatch
wrote:

missed the planetary gear direction, matching up the description
(reverse, reduction, etc.) with the gear pictures, and the fan
blowing on the fan.

The fan blowing on the fan is an ambiguous question. They're
facing
each other, and spinning the "same" direction, in the sense that
when viewed from the side, they're both spinning down on the edge
facing you (or up, depending on which side you're on). But when
each one is viewed from *its*own* front, one is spinning
clockwise,
and the other counterclockwise.

So is that the same direction? Or the opposite direction?

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Both blades rotate in the same direction regardless of vantage
point.
You stand behind one fan, and both blades turn clockwise. You stand
behind the other, both blades turn anti-clockwise. What on earth is
so hard about that, oh wise one?


It's a matter of viewpoint. the question is BADLY worded.

If both fans were turning in the 'same' direction,, both would be
pushing air from back-to-front of the fan.

one fan is turning 'forwards' the air is travelling from back to
front of that fan.

The other fan is turning 'backwards' the air is traelling from
front
to back of thhat fan.

Considered from a single external viewpoint, both are rotati in the
same diretion.

Considered from the view point of the motor on each fan, for
_that_
fan, they are rotatig in different diretion.

The issue is whether the fan 'reverses diretion of rotation' just
beause you point it in a different diretion.

*GENERALLY* shaft rotation is measured relative to the motor,
indepedant of absolut orientation in space.

They really should have just done the same thing they did with their
first rotation question--have two arrows and you pick which one points
the direction of rotation.

--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)