April 1999 Issue
Two Turbo Retrofits
Turbonormalizers for Mooneys and Bonanzas are well-engineered and deliver both higher speed and fuel economy.
The pilotís sacred trinity: Higher, faster, farther. Not to be vulgar, but to that precious list, itís our duty to add one more item: More money. Lots of it.
In single-engine airplanes, think of the money-to-speed ratio as a predictably gentle curve out to about 160 knots. Beyond that, it rockets upward steeply such that every additional knot costs at least a grand or two. (The general rule of thumb that speed mods deliver 1 knot per $1000 spent is remarkably reliable.)
While speed mods trickle on added knots by nibbling away at drag, the big gains come from turbocharging, which allows an engine to deliver rated power up into the thin air, where true airspeeds inch upward.
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