RC DYNO QUESTION
#1
Tech Rookie
Thread Starter
RC DYNO QUESTION
Hi,
Does anyone have the dimensions and weight of the flywheel used for their motor dyno?
Does anyone have the dimensions and weight of the flywheel used for their motor dyno?
#2
For what dyno?.
The Robi and Fantom have different dimensions and weights.
Just say which one and I will give you the figures.
Isaac
The Robi and Fantom have different dimensions and weights.
Just say which one and I will give you the figures.
Isaac
#3
Tech Rookie
Thread Starter
The Robi would be great, cheers
#4
Tech Rookie
Thread Starter
BUMP
#5
Tech Rookie
Thread Starter
Any help?
#6
Tech Elite
iTrader: (27)
Here is some data from the Robitronic Manual.
"In addition to that of the flywheel, the moment of inertia of the motor armature must also be considered for a measurement. The value above is an average of various commonly available armatures. The value should not be changed initially, but can be adapted for special applications. The factory setting is 4.20 x 10e-6 kgm2 "
The factory flywheel has a moment of Inertia of 45 x 10e-6 kgm2
This is calculated from the following formula
Inertia = 1/2 mass x Radius^2
I don't have the flywheel in hand to measure it. There is a robitronic thread. If you ask there for the radius and width you could calculate the mass with the formula. Here is a picture of the instrument if you just want a rough estimate.
You need to convert dimensions to meters and will get a mass in kilograms if you use the above formula.
If you would like more accurate power measurments on P2K type stock motors then you can use 3.0 x 10e-6 kgm2 for the inputed Moment of Inertia of the armature. Most people don't make this change.
Photo courtesy of Robert Schachuber.
"In addition to that of the flywheel, the moment of inertia of the motor armature must also be considered for a measurement. The value above is an average of various commonly available armatures. The value should not be changed initially, but can be adapted for special applications. The factory setting is 4.20 x 10e-6 kgm2 "
The factory flywheel has a moment of Inertia of 45 x 10e-6 kgm2
This is calculated from the following formula
Inertia = 1/2 mass x Radius^2
I don't have the flywheel in hand to measure it. There is a robitronic thread. If you ask there for the radius and width you could calculate the mass with the formula. Here is a picture of the instrument if you just want a rough estimate.
You need to convert dimensions to meters and will get a mass in kilograms if you use the above formula.
If you would like more accurate power measurments on P2K type stock motors then you can use 3.0 x 10e-6 kgm2 for the inputed Moment of Inertia of the armature. Most people don't make this change.
Photo courtesy of Robert Schachuber.
Last edited by John Stranahan; 01-03-2006 at 05:30 PM.
#7
Tech Elite
iTrader: (27)
Link To Robi Thread
Here is a link to a thread where there are some guys that own the Robitronic Dyno. They could measure the diameter with calipers. You or I could calculate the mass. They may not have a scale, but probably have a caliper.
http://www.rctech.net/forum/showthread.php?t=95842
http://www.rctech.net/forum/showthread.php?t=95842