Tail volume coefficient
The Leitwerksvolumenbeiwert c CPR for the horizontal stabilizer (CPR) is defined as the ratio of tail volume S CPR · r CPR to the product of reference chord length l μ and wing surface S . The reference wing depth is the depth of a rectangular wing, which aerodynamically corresponds to the wing under consideration. r CPR is the distance between the horizontal stabilizer's neutral point and the aircraft's center of gravity.
The values used in aircraft construction are typically between 0.5 and 1. Small values have a negative effect on longitudinal stability and trimmability . Large values are detrimental to overall efficiency, as the horizontal stabilizer only generates downforce when cruising . The Leitwerksvolumenbeiwert c SLW for the rudder SLW is defined as
- .
Therein is the wingspan of the wing. Typical values are between 0.04 and 0.08.
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Dubbel , paperback for mechanical engineering . Springer-Verlag, 2007, p. Q92 .