Designed for aerobatic airframes capable of 550 horsepower. 150 horsepower and over 2.0 G’s more than the SD400. Allowing more realistic performance for Warbird Replicas, Racers, and Aerobatic aircraft. Advantages SD550 70-71 lbs, Flywheel Assy 35 lbs.Only 5-6 lbs more than the SD400.Current price $44,000
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