Keith.Williams and Pugilistic Animus... Thank you both very much , its a lot clearer now , looking at it in terms of the equations mentioned helped sort things out , just a couple of lingering queries !
> I have a couple of follow up questions regarding Density .. (these lines also from the Perf. Manual regarding factors effecting Endurance)...
"For the Jet changes of temperature do not affect the Drag at Vmd [thanks to your help this point is clear to me now!]
so changes in Endurance results only from changes in sfc, which increases with temperature, giving reduced endurance"
Heres my Question...
> I understand that Endurance is greatest when FuelFlow is least and
FF = SFC x Thrust I dont understand the part where SFC increases with temperature .. SFC = FF/THRUST .. wont an increase in temperature (decrease in Density) effect both THRUST and FF(fuel flow) equally ?
"For Propeller aircraft, higher temperatures will increase the power required at Vmp increasing the FuelFlow, and reducing endurance"
...This statement i have no doubts in as the equation
POWER REQUIRED = DRAG x TAS makes it clear to me.
Thank you