High takeoff thrust, high continuous thrust and RPM ranges of approximately 35,000 to 130,000 are common features of mini jet engines. Mini jet engines are also typically less than 2 feet in length, and many models weigh less than 50 pounds, which results in a favorable weight-to-thrust ratio.
Despite a diminutive size, some mini jet engines have a takeoff thrust of roughly 15 to 34 pounds at up to about 130,000 RPM, such as the Cheetah SP series by JetCentral. The Cheetah SP weighs roughly 3 pounds and is about 9 inches in length. At its maximum RPM it consumes approximately 16 ounces of fuel per minute.
Generally, the max RPM decreases with heavier mini jet engines, and heavier mini jet engines inevitably increase the overall weight of any object that incorporates them, such as remotely piloted fixed-wing aircraft. However, the Mantis H250, which weighs 50 pounds with starter, has a takeoff thrust of 275 pounds and a maximum RPM of about 58,000. The length with starter is roughly 22 inches, and there are starter variations, such as propane and direct kerosene.
Similar to the Cheetah SP by JetCentral, the Tarantula H90 has a maximum continuous thrust of roughly 85 pounds and a maximum RPM of 88,000. It is about 18 inches with starter, 7 inches in diameter and weighs approximately 15 pounds.