I think the Kestrel 17 was measured at 41.1 by the idafleig - so 44.1
for the 19 is maybe about right - the 301 was I think measured at 39.1-
maybe more- the production 19's had 0.5m added at the root and 0.5m
at the tip. Manufacturers can claim all sorts of performance figures -
many are incorrect or 'theoretical' - surprised thought the idafleig
measured a js1c at 63:1. as Uys Jonkers recently stated in a video.