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Re: EPU tank and motor pressure telemetry equations?



Hi Moe,

the following information is from Stacey, W4SM:

The equations are essentially correct in P3T, but wrong in the documentation.

They should be:

Tank Bar = 0.0815 * X - 1.253
Motor Bar = 0.0835 * X - 1.381

....obviously, these are very close to the same.
In the documentation  the decimal is in the wrong place.

(Also note that the pressure indicators are not valid until
 the LIU Instrumentation is turned on)

73s Peter DB2OS




Moe Wheatley wrote:
> 
> Can anyone help unravel the discrepancy in the EPU tank and motor pressure
> telemetry equations?
> 
> The telemetry spec for locations #101 and #102 give the equations for the EPU
> pressure items:
> Tank Bar = 0.815 * X - 1.381
> Motor Bar = 0.835 * X - 1.253
> 
> The P3T program uses approximately the following equations:
> Tank Bar = 0.084 * X - 1.3
> Motor Bar = 0.082 * X - 1.4
> 
> To further confuse the issue, there is a document distributed with P3T,
> "P3D_AnlgP.htm" that says:
> Tank Bar = 0.835 * X - 1.253
> Motor Bar = 0.815 * X - 1.381
> 
> Currently, AO40Rcv is using the same equation as P3T instead of the spec.  This
> may get to be important if the EPU is activated for maneuvers in the near
> future.
> 
> Moe, AE4JY


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