Thruster T600N weight & balance

[xair1159]

Thruster T600N with a Jabiru engine MTOW 450kg. Very little info is available on the W&B over here and some of it is conflicting.

 

Where is the datum - leading edge of front spar tube or the rear of it?

 

What is the allowable CG range? One quoted is 451mm to 501mm aft of datum which seems a very limited range. I thought a typical figure was 14% to 28% of chord which with a roughly 1500mm chord would give a range of 210mm, not 50mm

 

Are there "official" moment arms for seats, fuel tank etc., or is it a case of simple measurement?

 

Any info, advice or relevant  pages from manuals appreciated.

 

Nick