Kilkeen's equations: sign?

[From Bill Powers (960106.1300 MST)]

Bruce Abbott (960106.1425 EST) --

In the first line of your comparative table there seems to be a
different in signs:

     Control model Killeen's model Equivalent formula

···

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(1) F = F + (m*R - M)*dt d = d + (M - m*R)*dt F = F + (m*R - M)*dt
              ^^^^^^^ ^^^^^^^

Unless there is a compensating change of sign later in Killeen's
equations, Killeen's model will be a positive feedback system.
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Best,

Bill P.