Hi Scott,
The Exception is available from Don at RCaiir. You hit the nail on the head - it is a glass Deception with a pipe floor in the fuse for rear exhaust engines. It eliminates a LOT of sanding compared to the wood version!

The Granat was an evolution of the Arrow. Wolfgang cleaned up the top of the fuse and allowed for a longer pipe. The wing span was increased as was the fuselage length. It was designed in 1984 when FAI pattern was 'converting' to Aresti style sequences. Wolfgang must have felt that the Granat would not meet the intent of the new rules (fly at 150m) as it was probably pretty fast like its predecessor; so he went back to the drawing board and developed the Joker - a much different airplane.

Arrow specs: Granat Specs:
Span 1600mm 1700mm
Length 1400mm 1580mm