COMPUTER PROGRAM USER'S MANUAL FOR ... - CAFE Foundation

F - single unit cost factor
E - empirical factor
For the computer program, an 89% slope learning curve was assumed. F and E
factors were generated to evaluate costs of 1969 and the projected costs of 1980 time
periods. The factors for propellers installed on each aircraft category are listed be-
low.
196 9 19 80
Category
I
F
3.5
E
1.0
Quantity
19
F
10 3.5
E Quantity
1.0 2230
I1
3.7 1.5 2810 3.7 1.5 5470
I11
3.2 3.5 1030 3.2 3.5 1990
IV
2.6 3.5 29 5 3.5 3.5 6 80
V
2.0 3.5 3.4 65 3.5 36 8
Computer Program
The performance generalization for conventional and multi-bladed propellers and
the corresponding noise, weight and cost generalizations described in the previous
text have been computerized. The computer program has been coded in FORTRAN Tv
and has been run on the IBM System/370. With this computer program, the aforementioned
propeller performance characteristics can be readily calculated for a range
of selected propeller geometries and desired operating conditions. Examples of parametric
studies made with the computer program are presented in another section of the
text.
There are four performance computation options available. First, if an engine
is specified, then the operating condition is defined with the horsepower and the cor-
responding propeller thrust is computed. Second, if a propeller thrust requirement
is defined then the thrust is included as input and the horsepower is computed, thus
indicating engine size. Third, for operating conditions defined by horsepower or
thrust, it is possible to define the tipspeed corresponding to 50% stall. This would be
the tipspeed for minimum noise. Fourth, reverse pitch angle and the corresponding
reverse thrusts for a range of landing ground roll velocities operating at the fixed
reverse pitch angle are computed. The corresponding noise (PNdB), weight and cost
for the first three options are calculated. The weight and cost are calculated for both
the 1969 and 1980 time period where costs are based on the 89% slope learning curve
and the unit costs and quantities selected by Hamilton Standard from available surveys.
There are the options of varying learning curve, unit costs, and quantities.
The required inputs for all options of this computer program are the following:
14