Cessna 210 Question

[fly5555]

My instructor never explained this to me ;

On the C210 you have a placard which provides you with the fuel flow on take off.

SL - 4000ft : 144lbs/hr - 2850 rpm

My question is do you use field elevation to calculate the fuel flow or should you use density altitude.The POH says field elevation, but on a hot day your DA can be 7000ft so your fuel flow should be alot less.

Please explain this to me

Thank you

[ChickenHouse]

Always be on the safe side, so if you need less, you get more safety margin. The C210 POH and Cessna tell you to use that number, that's it.

[dera]

Overfueling can hardly be considered "safe"?

[Mach Jump]

Both ChickenHouse and Dera are right.

The correct way to adjust the mixture for takeoff at high DAs is to lean until the engine just runs smoothly with T/O power set. This will inevitably be slightly rich. At high power settings however, slightly rich is less potentially damaging to the engine than slightly weak.

I would suggest that the figures shown on the placard are a guide to approximately what you should expect, rather than a figure that you should set, but I agree that it would be better if it showed density altitude rather than airfield elevation.


MJ