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The engine is a V-twin four-stroke, 895 cc (54.6 cu in) or 993 cc (60.6 cu in) displacement, fan-driven air-cooled, gasoline engine design.The larger displacement is achieved by increasing the stroke from 78 to 87 mm (3.1 to 3.4 in), but using the same bore of 86 mm (3.4 in).
The NFL allowed dummy communication in regular-season games in 1994, 38 years after the Browns' experiment. Rather than coaches calling a time-out in order to give a play to a quarterback, many of today's teams have opted for radios inside their quarterback's helmet. The helmets are set up with a small speaker in each ear hole.
A higher power 7-HP model was made (Engine Model# 84330) for use in heavier duty machines such as the single stage Snow Commander (2001–2008) and 2 stage Power Max 726TE/6000 (2004–2008); the extra horsepower was obtained using transfer ports in the piston and cylinder wall, and this model ran at the same operating speed as the 6.5 hp ...
The NFL has mandated the caps' use at practices for some players since 2022. Defensive backs and receivers have joined the position groups now required to wear the caps during all contact practices.
The frequencies teams have been using to talk to quarterbacks and defensive players have been unencrypted.
The outer shell of helmets have changed appreciably throughout the history of the NFL. In the 1920s, football helmets had soft leather exteriors, whereas today they have polycarbonate exteriors. The first molded polycarbonate helmet appeared in the NFL in 1986. [15] Today's helmets typically have polycarbonate shells on the order of 3.35mm.
The Briggs & Stratton BlockZilla motor is a more advanced form of the earlier Raptor motor. The block is built up to handle more power. This means that the block is about 6 lb (2.7 kg) heavier and has much more structural integrity. Also the exhaust and intake ports are set on an angle.
The research compared the Revolution helmet with other models. 2,000 high school players participated in the study which took place over the course of three years. The study's results showed that 5.4% of the athletes wearing the Revolution helmet suffered a concussion during a game as opposed to 7.6% of the players wearing the older model helmets.