# Difference between Power and Thrust (Fixed Pitch Prop, Piston)

Asked by: **zk**
**351** views
Aerodynamics

Hi, Having some trouble understanding the difference between Power and Thrust with regard to a fixed pitch propeller, piston engine aircraft.

I know the formulas and definitions of each but I still cant understand the practical aspect.

In particular, At minimum Drag speed we require the least amount of Thrust to overcome Drag, If I need to make the least amount of Thrust should Power not also be at a minimum?

When flying slower than min Drag speed the Drag increases so I need more Thrust to overcome Drag so I would need to apply more engine Power to generate that extra Thrust?

Yet at a point that is slower than minimum Drag it is actually the point of minimum Power required even though more Thrust is required... Why and How?

I realise what I have explained above is incorrect going by the books but thats my current understanding of the relationship between Power and Thrust, more thrust demands more power, less thrust then less power.

If possible please explain without the use of formulas and/or use another practical everyday principle that I could apply so I can better understand.

Many Thanks!

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