I am just starting my Sig 1/4 Cub and am building 3 degrees of right thrust into the firewall.  All my planes have 3 degrees, including my Sig 1/5 Scale Cub, and they fly great.  I am going with a Zenoah 26 CC Gasser for power.  Good luck with yours.<div>
</div><div>FYI:  The 1/5th Cub also lacked right thrust in the plans and the manual.  Wonder if the forces of torque fail to exist at Sig?
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</div><div>SunDevilPilot</div></div>