Hello
I asked my friend Christophe who is owner of this MVVS. He told me :
No breaking on ground. Breaking in flight with rich set up. carburant = 15 % oil, 10 % nitro.
Propeller APC 17x13 N. Very powerfull for the OTOP.
Now he noticed just a variation of set up one (rich, lean !) day and other days. May be engine is not enought running or the regulator Webra must be set ?
Regards
On my OS 160 FX I used a regulator Cline and I never got problem of set up with.
May be Cline is better than Webra !