They began the session with a christmas themed phonetic alphabet quiz. This was followed by looking at the four forces of flight - weight, lift, thrust and drag.
The group then split in to small groups and together built propeller driven vehicles from kits.
They took their inventions to the hangar where they raced them. It got quite competitive at times and a few minor adjustments were made to improve performance!! 
The session ended by looking at the design of various aircraft and the effects of the the forces upon them.
It was another great session - we are always amazed by the knowledge of the group.
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