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Every RC modeler knows about The Dynatron starter. It is considered a field essential by most and instantly tames stubborn engines into submission with its amazing starting power. The most powerful Sullivan 2.50" starter. Features a machined aluminum drive cone with pulley groove, 2.50" diameter steel body and gold end caps. Designed for 12 or 24 VDC operation, maximum 100 amps. 340 in-oz (240 N-cm) of stall torque at 12V, 680 in-oz (480 N-cm) at 24V. 4800 no load RPM at 12V, 9600 no load RPM at 24V. Easily starts all engines up to 2.4 cubic inches (40 cc). Works great with up to 6S LiPo battery.
Ask anyone that you fly with who owns one. Also available; 3" gold aluminum nose cone (#S630) which threads directly onto Dynatron shaft.
Dave's Notes: Well known to be the strongest direct drive starter of this diameter.
Backed by the Sullivan 2 Year Limited Starter Warranty. Sullivan Starters have been designed for decades of dependable service.
 "Sullivan Dynatron Super Power Starter")