I'm putting my World models 90" Extra 330L together right now.

The motorbox is tabbed and keyed so that when I build it--there is 3* right thrust and 1* downthrust. That seams completely normal to me. Build it like that and then adjust after I fly the plane.

Someone sent me a PM and told me that all low wing (Extra 330L) aerobats should have 1* UPTHRUST in the firewall. I've never heard of this.

Would anyone care to comment on building 1* engine upthrust into a 90" plane? Doesn't seam right to me.