hi Got the q3b from China,,looks and feel ok a heavy small engine,,so try it on air first,,no revers works,,and i try to find the timing,,have to email Jin,,and a few days got the timing,,so ,,works with very slow revers,,so try on steam ,,30 psi,,no revers,,and after a few minuts it stop,,have to open it ,,one piston vas lose,,
I had to separate it to correct the error..and on steam again,,run a few minuts,,now the other piston get loose,,I had to separate it, to correct the error again,
but no revers only very littel,,and the engine eat the steam fast,,i email Jin,, he sai that the engine have that construction there so it have not the same,,speed on revers,,i have get enof and spend times on this ,,so i didnt wont it,,Jin said i can send it to Rafhael in France,,he did a test,,and sai the same,no revers work,,
so i got a full refund from Jin,,only it have cost me 22 us to send it to france,,i have ask him to send that 22 back,,let se if he do that,
Regards Bernhard