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Pro Series II The Pro Series II line just got a new member! Meet the Super Big Bertha, featuring a BT80 (2.6 in/66 mm) diameter body tube for your building enjoyment. Standing over 36 inches tall, the Super Big Bertha comes with the quick release motor retention system just as the other Pro Series kits do. (9750 Motor Retainer Set is also sold separately). Construction of this kit is not difficult and the altitudes you will reach are very impressive! Building and finish work can easily be accomplished over a few days. AND did we mention its a bring back from around 1990? Soars up to 1100ft(335M) on a F15-6 engine, also compatible with E16-4 engine. ATTENTION: Requires PS II Launch Base (3552) with 1/4 launch rod or Porta-Pad E Launch Pad (2238) and E Launch Controller (2230) or Pro Series II Launch Controller (2240) with 30 of wire Sold Separately.