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HelicopterOff Topics › Effect of weight on vehicle efficiency?
01-21-2013 08:59 PM  4 years agoPost 1
fly4d

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The waters

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Just curious, does the position of weight (front, middle or rear) in a vehicle effect mpg's? This is assuming the same vehicle and same aerodynamic features.

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01-21-2013 09:31 PM  4 years agoPost 2
rander1

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Dallastown, PA

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I imagine it would. The closer the engine to the center of the car, the less the car tosses through turns and sways upon acceleration and acceleration.

The same goes for the height of the engine/mass. The lower the CG the better. Less rotational mass up top (think of the leverage effect of weight).

This means a more efficient transfer of power to the ground through the frictional forces of the tires.

So I would say yes it has some effect.

Tic Toc Tic Toc

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01-21-2013 11:32 PM  4 years agoPost 3
jcrack_corn

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End of Time

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I imagine it would. The closer the engine to the center of the car, the less the car tosses through turns and sways upon acceleration and acceleration.

The same goes for the height of the engine/mass. The lower the CG the better. Less rotational mass up top (think of the leverage effect of weight).

This means a more efficient transfer of power to the ground through the frictional forces of the tires.

So I would say yes it has some effect.
no. none of this matters.
handling/stability has nothing to do with the relationship of weight to efficiency.

EDIT: talking about the ops question, does it matter where the weight is RE efficiency. (ie, it obviously matters if you can have a rear/mid mount engine with a short efficient drive train to rear wheels. but thats not the question).

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01-22-2013 12:00 AM  4 years agoPost 4
junkpilot

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Alamogordo N.M.

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Effect of weight location on vehicle efficiency

Only Vehicle I can think of where this applies is a glider!
Junkpilot

When you fly JUNK it's hard to tell when you've crashed!

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01-22-2013 01:31 AM  4 years agoPost 5
spaceman spiff

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Tucson

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If the weight is in the front it leans forward, so it is always going down hill.

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01-22-2013 02:16 AM  4 years agoPost 6
Noobyflyer

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Clearwater, FL

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no

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01-22-2013 03:37 AM  4 years agoPost 7
jcrack_corn

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End of Time

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If the weight is in the front it leans forward, so it is always going down hill.
lol...although i approve this message and will steal this, i shudder to think of the arguments that are about to occur from people who take it seriously, lol...good one.

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01-22-2013 03:34 PM  4 years agoPost 8
spaceman spiff

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Tucson

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Putting bigger wheels on the back is annother way, and it lasts longer than duct taping a bunch if scrap metal weight to your hood.

My girlfriend who is also my cousin taught me that trick.

OK fine. My guess is ballanced is probably better. The reason would be rolling reststance of the tires increases with the sign of the crush patch angle. (not linear) so two sets of matched ( minimum) crush will end up with lower rolling resistance, than one pair of tires with high crush and another set with lower crush.

Another good guess would be to place more on the back because the front tires typically have some amount of toe-in angle when they set the alignment....

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