With the glaring exception of cutting the prop (BAD idea!), all the advice you've gotten here is sound. Some folks will tell you that if you trim a plastic spinner, use it on a four stroke engine, etc., etc., it will blow up, destroy your planes, and in general cause you grief.

Nonsense. While you are correct in assuming that cutting into the locator pins will weaken the spinner and raise the possibility of failure, you CAN do so to a degree without drama. The red spinner pictured is a 2.5" Goldberg cut out for an APC 16x6. I went WAY too far on this one. I was in a hurry and didn't do nearly as neat a job as I did on the blue 3" Goldberg. But both have lasted for a good long time; and these are on big engines. The red one is on an OS 1.08; the blue one on a Laser 150. Both have slight encroachments on two locator pins to fit the wider blades.

I don't use an electric starter, and I don't run the Laser lean; back-firing four strokes will trash a spinner quicker than anything. Some guys think their electric starter needs a "running start" to crank the engine. They spin it up, then jam it against the spinner; and wonder why their gear fails.

Anyway, just get a larger size if you don't want to chance messing about with the locator pins. A 2.5" DuBro or Goldberg should handle an 11" APC prop without having to get into the locator pins.

And I agree with Brother Cranford regarding Master Airscrew props; APC is LEAGUES above these paint stirrers...

See next post for the pix; you cannot post pics in a "Quick Reply" post, which is a constant source of annoyance to me.