VOLTCRAFT 23 87 82, Operating Instructions Manual

Page: 53 / 116

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15. THRUST CALCULATOR
The thrust calculator can be used to determine an average for the expected standing thrust
of a rotating propeller by entering the required calculation values. In addition to the propel-
ler diameter (“DIAMETER”) in inches, the maximum speed achieved on the ground
(“RPM”), number of propeller blades (“BLADES”) and efficiency coefficient (“CF”) of the
propeller must be entered.
Overview of the efficiency coefficients of different propellers:
Propeller manufacturer Effectiveness coefficient “CF”
Standard propeller 1.00
APC propeller 1.06
APC-SF 1.50
APC W propeller 1.09
MenzS propeller 1.03
Bambula propeller 1.02
Bolly Clubman 1.04
Cox propeller 1.10
GWS HD 0.75
GWS RS (SF) 1.10
Smart 1.02
Zinger Wood 1.00
¼
Since this thrust calculation is estimated, the propeller increase is of subordinated
importance. The propeller increase would only play an important role when
calculating the expected flight speed.