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I have an odd application. I Need to be able to hook my motorcycles to my truck to charge the battery an warm them up I ride them in super cold (-35*F) and need to find way to hook the truck to the bikes but only limit the current to 10 Amps to each bike. They both have LIFEPO4 Batteries. The...

Im trying to figure out how much power is needed to maintain a vehicles speed on a slope I found out that my car weighing in at about 2000 lbs needs 15hp to maintain 75 mph on a flat road with no wind. now I'm trying to figure out how to take that and calculate the power needed on a 10% grade...

Thanks! I tried googling but was not using the right words!

I'm trying to calculate the heat loss of efficiency due to increasing the mixture of propylene glycol in a heat transfer fluid compared to water.. For this I'm saying that water has a heat transfer efficiency of 100% (relative only) Im looking for multiple data points to create an equation...

I thought it was a thermo problem. Its not a HW type problem if that what your thinking, I own a company that sells solar products (PV & Thermal) and of all the pros and books out there i can't find much on this topic. I wanted to develop a program that would be able to calculate how much hot...

Ok so my question is about hot water in a home Lets say that I take a shower a shower and i use 20 gallons of water at 105* F If the hot water in my tank is at 140*F and my cold water comes in at 50*F how much of hot (140*F) water did i use? How much cold (50*F) Water did i use? Now...

Im wondering why you are using a DC motor and not an AC motor with a VFD/Inverter? I am correct on the use of a DC motor right (the ON/OFF remark)

Yeah i know acceleration won't be constant but tq will remain constant thanks to nifty little devices called VFDs. like you said I am just after the general numbers not the exact one. thanks for you help!

Now how does this work if i start at say 25 mph and want to go to 75 mph with all the same numbers

thanks! actually I'm working on designing a EV truck with 6 150hp AC motors one on each wheel so making enough tq for 15 seconds is not a problem... my problem is building a battery pack, Super Cap pack and generator to power it all.

could you break that down for me. what is dp and dt? and I'm thinking f is force? I can find the G Force exerted on the car i just don't know how to turn that into time to a given speed here is what i have so far Givens: Weight: 5000 lbs Wheel Radius - 10 in Tq @ Wheel 3000 ft-lbs Calculated...

Ok so here's what I'm trying to figure out: Given a required time i need to figure out how much wheel thrust is required to accelerate a car or truck to a given speed. (ie take a 5000 lb car to 75 mph in 15 seconds...) I've been searching but can't find a good formula to use. please help