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on PPC airspeed which remains relatively constant whether climbing, descending, or in level flight. 

When enough thrust is added to produce level flight, the relative wind stream becomes horizontal with the earth; the angle of attack and speed remain about the same. Just as described in the Pilot’s Handbook of Aeronautical Knowledge for the airplane, thrust equals total drag for level flight. [Figure 2-16] 

When in straight-and-level unaccelerated flight: 

<img src='content_image/566202.jpg'>

When excess thrust is added to produce climbing flight, the relative air stream becomes an inclined plane leading upward, while angle of attack and speed remain about the same. Just as described in the Pilot’s Handbook of Aeronautical Knowledge for the air- plane, the excess thrust determines the climb rate and climb angle of the flight path. [Figure 2-17] 

LIFT (L) = WEIGHT (W) and THRUST = TOTAL DRAG (D T ) 

<img src='content_image/566201.jpg'>

## Center of Gravity 

The center of gravity ( CG) is the theoretical point of concentrated weight of the aircraft. It is the point within the PPC about which all the moments trying to rotate it are balanced. The most obvious difference in the center of gravity for a PPC is the vertical position compared to an airplane, as it is much lower than the wing. The  Pilot’s Handbook of Aeronautical Knowl- edge  accurately states the center of gravity is gener- ally in the vertical center of the fuselage. The same is true for the PPC. However, the PPC wing is high above the fuselage (cart) creating the unique pendu- lum effect flying characteristics of the PPC (which will be covered in detail later). 

In a two-seat PPC, the second seat is typically behind the pilot’s seat, and the center of gravity is usually located directly over the rear passenger seat. There- fore, the center of gravity location does not change significantly with or without a passenger. Fuel tanks are typically located near the center of gravity so any differences in fuel quantity will not significantly change the center of gravity fore and aft with different fuel quantities. 

