Related Clues:

• Start for jet, fan or charge
• Engine type
• Powerful kind of engine
• Auto engine type
• Spherical starter
• Half: Prefix
• Type of plane
• Type of engine
• Feature of some muscle cars
• Powerful car engine, informally
• Aviator's craft, perhaps
• Half (Pref.)
• 50 percent (Pref.)
• Spherical opening?
• Jet or charger start