During the 70s a couple of Cox engineers were playing around with different colored Babe Bee and Golden Bee parts and came up with an all-black engine with a red spinner. They hopped it up a bit with a dual bypass cylinder from a Super Bee (#1), a black Golden Bee tank and a slightly larger (0.082") venturi intake. The Black Widow was born. These engines were marketed as a High Powered Combat Engine. On later Black Widows the red rubber spinner was replaced by a red anodized aluminum Tee Dee style spinner. In the late 1990s some Black Widows were produced with the a dual bypass slit exhaust cylinder. The slit exhaust was to prevent fires. According to an Aeromodeller engine test done in August 1974 the Black Widow on 25% Nitro output power was 0.08 bhp (60 watts) at 15,000 rpm with a max. torque of 6 oz.in at 9,000 rpm.