Problems in Helicopter Funcs DLL (custom derived functions)
James Bretz
I just wanted to give a "heads up" on a problem with the custom
HelicopterFuncs dll that was discovered today by the fine members of the
Bell team. Every function in that DLL is affected (AlternatingLoad, Average,
AverageLoad, Maximum, and Minimum). I would imagine that the value would be
very close, but not exactly what everyone was expecting to see.
Apparently, I was incorrectly including the first point of the next "rotor
blib" cycle in the previous cycle's calculation of the Minimum and Maximum
values. As a result, the answers could potentially off by a small amount.
Maybe this will help to clarify:
Az Az Az Az Az Az
10 9 9 9 9 8.9
^ Blib
The calculation was actually using the value _at_ the "blib transition" as
part of the Min/Max calculation for that blib cycle, which is incorrect. The
blib change marks the change into the next "cycle", thus the 8.9 value above
should not be included in the calculation of the max/min for the cycle
(10,9,9,9,9). Calculating the min/max incorrectly affected every function
because they all rely on these two values.
As soon as the testing results come in I'll send the corrected dll to the
google group files area.
I hope someone from Pax and Ft. Rucker is listening
(Matt,Andy,George,Wayne,Les). Sorry for the problems,
Jim