..Thank your comments and appreciation first.
This Yak-54 is a sample for testing and total weight is about 7.2 kg.
wing span:2.2m
I think it have some problems of structure,it's not light enough.
I replace lots of accessories and wing tube(carbon tube) to made it lighter.
However,its performance is "Bravo"
..especially ,while do the flat spin(obverse turn to inverse) is so agile.
I'll show more picture of equipments later.