All the stuff that already creates drag is already creating drag, so it isn't the issue here. Anything you add into the airstream will create more drag: Stick your hand out the window of a car and you can feel that it adds drag!zente said:The engine is already pushing the vehicle and a certain amount of air pressure is already being both deverted ( pushed aside by the body of the car ) and also directed through the radiator, the braking system ( for cooling ) , as well as the vents for your flow through ventilation etc. So why is this same air ( non deflected ) putting more power requiremnts on the engine just to be directed into a fan / turbine to spin a generator. How would the internal air flow effect the drag of the vehicle any more than it already is now?
That's a completley different issue as adding airflow into the engine allows you to add more gas and generate more power. It doesn't change the efficiency much except insofar as the efficiency drops off when the power gets high and airflow gets choked (it doesn't increase efficiency at low power, for example).We used to in the 60's and 70's put hood scoops on our street race cars ( which they still do today ) to force more air into the carberator to make the engine breath easier. The hood scoop added drag but the added power output of the engine far more than made up for the drag.
Ok, well, it may be possible to put a turbine inside the engine compartment in a way that makes use of wasted airflow, but it would have to be done in a way that doesn't interfere with airflow through the radiator or to the engine. I'm sure it depends on the car, but I doubt there is much truly wasted airflow through the engine compartment.zente said:I think you or I have a different concept .. I do not want the fan / turbine on the outside of the car... I want it inside the body / engine compartment with the duct at the front grill area and everything being enclosed in the existing vehicle. I know if I place it outside the body it effects the drag and thus the power requirement of the engine.
molitor said:Besides that, think on this, if you reduce the demand on the engine driven charging system, you free up power to overcome the extra mass.
jarednjames said:If you reduce the demand on said system, you then also need to compensate for what you lose there. Whether you compensate for the mass or this, either way the amount is the same.
molitor said:I get the idea but the first portion of your statement didn't make a lot of sense. Other than that, here's pro to reducing the ''Engine driven charging system''. You're not using the engine to charge the batteries! That means your reducing the load on the one component in a hybrid that uses a non regenerative energy source.
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