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Let's
see if I understand this.
To
help me read the map, I made a tiny spreadsheet (attached) to show lbs/min at
various rpm
This
tells me I have 23lb/min at 6000. So...
At SL and MAP 50 I have a PR of (30+20)/30 = 50/30 =
1.66
So on the map I read up from
23 till I hit 1.66 on the y axis
and see that I'm on the bottom of the island.
Now go
to 10000ft and set the MAP at, say 40. My PS is now (10+30)/10 = 40/10 =
4.0 which is off the scale. :(
Looking at the (compressor) MAP again I see that my max PR at 23lb is
about 1.8, so working backwards my max MAP at 6000 ft is 18 if I want to stay on
the island. To get into higher PR's I need more rpm. I'd need 9000+
rpm to reach the top of the island where the available PR is about
2.5.
Doesn't sound right. Where did I go wrong?
Comments?
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