AOPA Pilot Magazine - October 2021 - 88

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successfully completed a grueling detonation
test of that engine in the test cell.
The company was also planning to do
a 150-hour test cell run on a Continental
IO-550N with an aftermarket turbocharger
on it. GAMI owns an STC to
install that combination in the Cirrus
SR22. The normally aspirated engine
with its high-compression cylinders is
rated at 310 horsepower. However, in
previous testing and in this additional
test, Braly plans to boost it to between
330 and 350 horsepower. Corrected to
standard atmospheric conditions, the
engine running on G100UL was producing
414 horsepower in extreme
conditions and did not detonate during
a similar test in December 2020
witnessed by the FAA. Assuming the 150hour
test goes well, Braly said he may
apply at some point to boost the horsepower
on the company's STC, allowing
pilots flying that combination to get more
performance. The forgiving detonation
qualities of G100UL may allow warbird
engines designed for 115 octane fuel to
operate once again at their full potential.
Using 100LL, those large radial engines
have had to be operated at less than full
power during certain conditions to prevent
detonation.
88
AOPA PILOT / October 2021
Once those two engine tests are
complete this fall, Braly said the FAA may
add additional engines and airframes to
the AML STC regardless of the status of
the flight school program.
During its 11-year development
cycle, the fuel has passed many extreme
test cell challenges, according to Braly.
Materials combability testing has also
Is this the holy grail of unleaded
fuel? Did this little Oklahoma
company somehow figure it out
when the likes of Phillips 66,
Exxon, Shell, and so many other
big companies could not?
been completed. He said the fuel, which
will be dyed amber, is completely fungible
with 100LL and mogas, meaning it
can be mixed in any combination. The
fuel weighs about 6.2 pounds per gallon,
slightly more than 100LL at 6 pounds per
gallon, which is a certain irony-that the
unleaded fuel weighs more than the one
with lead in it.
Amber G100UL (left) becomes pale green (center) when mixed with blue 100LL avgas (right).
G100UL creator General Aviation Modifications Inc. says the two fuels can be safely blended in any
combination, making it easy for FBOs to mix the new fuel with existing 100LL during the transition.
COURTESY GAMI

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AOPA Pilot Magazine - October 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - October 2021