ChiefPilot
Pre-takeoff checklist
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- Dec 1, 2013
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ChiefPilot
4's and 6's are spec'd for the same engines. The -4 is lighter, has less drag, and more wing. It should win against a -6 with an equal pilot. RV vs Glasair is Zero vs Mustang. The faster airplane can generally choose the terms of the encounter and win by maximizing the benefits of the speed advantage.
That particular -4 has an O-320, while that particular -6A has an IO-360. The -4 also has a Catto FP prop, while the -6A has a Hartzell BA. The -4 also has the same wing area as a -6/6A, but is generally lighter as you point out. A factor that makes a difference that isn't represented by the Zero/Mustang analogy is visibility - the RV-4 has better visibility all around. The -6A with the slider isn't quite as good due to the turtle deck to the rear and the canopy bow (the tip-up has very little rearward visibility). But the biggest difference is the pilots - we both engage in ACM regularly; sometimes multiple times per week. If one of us let off for a few months, the first couple setups would be a bit lopsided.