"The Prop 65 lawsuit will disrupt ongoing efforts by the
FAA and EPA, who are working with industry groups to identify an
alternative to leaded fuel that can be safely and reliably used by
piston-powered airplanes.” Source: Letter sent by
some members of the U.S. Congress to the DOT, FAA, and EPA.
An alteration not listed in the aircraft, aircraft engine, or
propeller specifications that might appreciably affect weight,
balance, structural strength, performance, powerplant operation,
flight characteristics, or is not done according to accepted
practices or cannot be done by elementary operations.
Faster, higher, further ... with emphasis on the "faster." As
DARPA tests another Mach 20 aircraft, we looked at some of the
history and mechanics of hypersonic flight. This explanation is
from the Centennial of Flight website.
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