Elon;
That might work. The TPS sensor would need a big pulley to keep its rotation
angle within limits. With a big pulley the drag of the TPS sensor might not
be to much of a factor.
Regards, Neil Tucson, AZ
-----Original Message-----
From: Elon [mailto:saltfever@comcast.net]
Sent: Thursday, January 17, 2008 12:05 AM
To: drmayf@mayfco.com; neil@dbelltech.com
Cc: 'Ed Weldon'; 'Don McMeekin'; 'Keith Turk'; 'land-speedsubmit';
NT788@comcast.net
Subject: Polar Moment
Great idea, Neil. Even if you don't have a swimming pool you could use
something like 10"-12" irrigation PVC. Cap it at both ends and fill with
water. A single sawhorse in the back yard could set plane angle. I guess
diameter has to be big enough (or model small enough) to be free of side
wall influences. Ed's idea of a model railroad tract sounds interesting
glued into the bottom of the PVC pipe. Some of the current data loggers are
fairly inexpensive. Innovate's SSI-4 is $129. You could also record temp,
barometer (a MAP), etc.
I think Mayf has a LM-1 data logger for his O2 sensor. Maybe borrow his :-).
Sample rate is 12/sec. Instead using a light-beam underwater why not hook up
a string or piano wire to a used TPS sensor or other EFI sensor. $1-$5 used
from the wrecking yard.
-Elon
-----Original Message-----
(1) drmayf [mailto:drmayf@mayfco.com]
snip . . . How would you time the roll down the ramp? A second or two might
mean a big difference in perceived performance.
(2) neil@dbelltech.com wrote:
My idea is to do the drag measurements with a minimum of instrumentation.
Simply build a smooth ramp and place it in a swimming pool at a known angle
and let the model roll down the ramp for a measured distance. . .
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