Dan Luke wrote:
"Newps" wrote:

I'm not saying that what the JPI does isn't useful. Just that it doesn't
fit my definition of "direct measure".




As long as it's accurate, who cares?


I would not accept as accurate a calculation that leaves out essential
parameters. It's an educated guess.

No, it's either accurate or it's not. Compare what the JPI says to what
the chart in the POH says. If it's accurate then it is irrelavant how
it got the information.