# for all the math geeks...

• 09-28-2012, 09:20 AM
f687s
for all the math geeks...
im trying to figure out how many Amps per hour my titan 12t pulls. it has the included spur installed and the truck lasts 20 min. i need to know the formula and the answer to this. note: it is harder than it seems.

PS there will be more math rc questions later on.
• 09-28-2012, 01:34 PM
Jimmie Neutron
What is the size of the battery?
We need actual capacity, not what the label says.
• 09-28-2012, 11:07 PM
reod12x2
? how much does it pull at max no matter what battery? right?

and yes it is a hard question so many variebles left out that we need to know
• 09-29-2012, 07:47 AM
Jimmie Neutron
Need to know how many mAh it has... so yes, it does matter what battery; we only have one part of the equation: 20 minutes.
• 09-30-2012, 12:03 AM
reod12x2
hmmm lets say stock cell
• 09-30-2012, 06:51 AM
The VXL
we can only work out an average from this because the load is not continuous
• 10-01-2012, 09:36 AM
f687s
the batt. is a 8.4 3000 MAH. the truck was lifted off the ground and was at full trottle the whole time. the servo was powered by a second radio and a reciever batt.
• 10-01-2012, 10:09 AM
deerhurst
[QUOTE=f687s;5299457]the batt. is a 8.4 3000 MAH. the truck was lifted off the ground and was at full trottle the whole time. the servo was powered by a second radio and a reciever batt.[/QUOTE]

That load will be very different from the load when he truck is pushing its self. It will also be very different from the load of accelerating.

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• 10-01-2012, 04:47 PM
Jimmie Neutron
The need arises to change mAh to Ah... mAh / 1000 = Ah

To calculate run time of a battery... capacity Ah / Ah draw * 60 = time

Since time and capacity is known, using basic algebra you can solve for the unknown.
• 10-02-2012, 09:22 AM
f687s
[QUOTE=Jimmie Neutron;5299671]The need arises to change mAh to Ah... mAh / 1000 = Ah

To calculate run time of a battery... capacity Ah / Ah draw * 60 = time

Since time and capacity is known, using basic algebra you can solve for the unknown.[/QUOTE]
thanks, can you guys put more RC math ?s
• 10-02-2012, 11:15 AM
Jimmie Neutron
Discharge amperage for a battery:
mAh > Ah * discharge C = Available Amps
so
(mAh/1000) * discharge C = Available Amps
• 10-03-2012, 09:22 AM
f687s
how many fluid ounces is 75cc? what is the formula of cc to FL OZ
• 10-03-2012, 09:33 AM
Jimmie Neutron