I will not be surprised if you haven't ever heard about this funny little aircraft
http://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-8
All of a sudden two companies have released kits in 1:72
Prop & Jet
http://propjet.ucoz.ru/news/mikojan_samolet_utka/2013-09-02-24
and AVIS
http://www.hannants.co.uk/product/BX72013
I was among those few lucky ones who obtained Prop & Jet kit - what a little resin gem!
The instruction mentions that 3g of weight should be added to the nose