The PT6 engine measures torque, which is shown in ft.lbs,
although the higher rated engines often use percent.

Measuring torque cost money, it isn't "cost effective" on
low powered engines.



"Roy Smith" wrote in message
...
| In article ,
| Newps wrote:
|
| Doug wrote:
|
|
| There is no percent power guage that gives a direct
measure of the
| engines output.
|
|
| Sure there is. JPI has one in their engine monitors.
There are others.
|
| I suppose it depends on what you mean by "direct measure".
|
| Power delivered by a rotating shaft is RPM * Torque. RPM
is easy to
| measure directly, torque is somewhat more difficult. In
any case, the JPI
| gizmo doesn't measure torque. It measures manifold
pressure, and fuel
| flow, and intake air temperature, and maybe a few other
things, and
| computes how much power the engine must be delivering
based on those
| inputs. That's not quite the same thing as measuring the
output directly.
|
| I'm not saying that what the JPI does isn't useful. Just
that it doesn't
| fit my definition of "direct measure".