Density Altitude.... :o...!
Always a good reminder for me when
Sim flying in and out of Big Bear City Airfield (L35), (Southern California), high up in the San Bernardino Mountains, in my little Cessna 150 when touring Southern California!....>>>
http://www.bigbearcityairport.com/mouta ... you-think/That climb over the towering San Bernardino mountain range from the Los Angeles valley, on approach, and take-off, always involves a tightly clenched Bum, a prayer (or three), and judicious use of the Mixture Control to achieve as much power as possible!
An excellent Sim test under varying atmospheric conditions!
Paul...survived...so far!...

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..remember..you can always abandon the flight...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.