Old 7th Mar 2010, 21:52
  #8 (permalink)  
Join Date: Jun 2008
Location: New Zealand , Wellington
Posts: 21
Actually, the power output of a normally aspirated engine will initially increase during climb from sea level. This is because the back pressure on the exhaust side decreases, and that effect overcompensates the power loss due to decreasing air density.

I very much doubt this. Exhaust back pressure on aircraft is quite minimal compared to car engines etc, and even modifying the exhaust on a n/a engine for more power still yields very small gains. Higher alitude, less air, = leaner mixtures = less power. Exhaust plays a minimal role.
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