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postjp
Posts: 55
Registered: 4-9-2001
Location: Leeuwarden
Member Is Offline
Mood: Weamy
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posted on 29-9-2008 at 18:10
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Computer Dyno for slotcar motors
Hello Guys,
maybe this is interesting for you when you want to use handout motors or want to check a really fast motor of your opponent compared to your sluggish
one!!!!
I found this on the site of Chas Keeling:
http://www.chaskeelingscd.co.uk
see the tab "what's new"
VERY INTERESTING STUFF! I did add a picture with it but I seem to be a magician! Gone, gone, gone?
NEW RELEASE
Slot Facts Machine Computer Dyno w/ Windows Program & USB Adapter
Why Dyno a Motor Anyway?
Judging a motors performance based on maximum RPM is like judging the weather based solely on the temperature. If it is 80 degrees outside you can be
fairly sure it’s not snowing, but is it sunny or raining? Is it windy or calm? Temperature is only one factor in the weather, just as RPM is only
one factor in the selection of a motor. Just like there’s wind and precipitation, there’s torque and power. Only a dyno test can tell you the
complete story. Let’s suppose you and a competitor both have motors that will turn about 30,000 RPM. Without a dyno, most people would say that you
have equal motors. But suppose his motor accelerates to 30,000 RPM in 2 seconds, while yours takes 2.5 seconds. Assuming both cars are geared to top
out at 30 mph, this makes a 4-foot difference at the end of a 20 ft. straight and an 11 ft. difference at the end of a 90 ft. straight.
STILL THINK THE MOTORS ARE EQUAL?
The difference in the motors discussed above is in their TORQUE. The one that accelerates faster has more torque, and since POWER equals TORQUE
multiplied by RPM, you can see that even though both motors turned 30,000 RPM at some point, your competitors motor had 25% more power than yours.
Power is what you want in a motor; not no-load RPM! The only way to determine the power output of a motor is on the dyno where torque and RPM are
measured at a consistent voltage to determine power. The “SLOT FACTS Machine” utilizes the only system on the market that can do these
measurements on a consistent basis. Slave motors and load cells just can’t cut it.
OPERATIONAL THEORY
The dyno senses the speed of the flywheel, with a known moment of inertia, and also senses the current being delivered to the motor (this information
is sent to your PC). The speed of the flywheel at specific intervals is integrated to obtain the acceleration of the flywheel. The torque output of
the motor is computed from the flywheel moment of inertia and the flywheel acceleration. At the same time, the power output of the motor is being
computed from the torque output and the flywheel speed. All of this information is then made available to the user in the form of graphs and charts.
These options are selected by simply moving through the menu choices to provide output to the screen, your printer, or a file for later use.
'Approx £420 depending on current exchange rate'
Spare Aluminium Replacement Flywheel available -
only needed after dynoing a few thousand motors.
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tamar
Posts: 804
Registered: 5-1-1989
Location: Gouda
Member Is Offline
Mood: A new beginning 
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posted on 30-9-2008 at 13:48
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Unfortunately...out of production
Hello Johan
Good too see you're still following the 1/24 slotscene.
But although the Slot-Dyno is a great machine, it is unfortunately no longer in production.
I believe a first batch of 20 dyno's were produced in 2007, amongst others Dan Debella of PRo Slot distributed them they all sold quite fast.
Everybody was very enthousiastic about the dyno, stating that it was worth every penny of its high end price of ± 600$.
And maybe even more......because when Dan wanted to re-order the company could no longer deliver.
I believe Francesc was one off the lucky guys that managed to buy one, so maybe he can give more info
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