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Old 5th Jul 2020, 15:02
  #25 (permalink)  
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Join Date: Apr 2000
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Calm down, calm down.

No, Robinson don't provide you with a means for calculating your MAP in the hover.

However, you can confirm that you are under the AUM for IGE and OGE hover for your operating conditions (presuming you know your PA and OAT).

If you are under the AUM from the both the graphs then, as long as you are in the hover at less than your MCP figure from the placard, you should have a half decent performance margin.

You can work out roughly how much by looking at the MAUM for OGE at your selected operating altitude - lets say you are at 6000 ft PA and plus 30 deg C OAT and hit the 2200lbs GW line on the graph. If you are at 2200lbs you have OGE but no performance margin, for every 220lbs you are under that AUM, you gain a 10% thrust margin. That sounds like a lot but it is probably enough power to overcome light turbulence or achieve a couple of hundred fpm RoC in the hover.

At lower density altitudes you will have more performance and should never get close to MAP limits unless you are ham fisted.

The problems come when pilots do not calculate their AUM and C of G correctly and do not check they are under the weights for IGE or OGE hover at their planned operating altitude.

It's not our fault Robinson don't give you better performance graphs btw.
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