Yup. Speaking from experience my LT-40 flies far better with the 11x5 than the 10x6. Our field is surrounded on three out of four sides by fairly tall trees, so take-off's and landings have to be steep. The 11x5 prop gives me far better power output than the 10x6 for those sharp take-off's, and a lower idle speed for those short approaches.

As always though, try a few different prop sizes and see which one suits you best.

Cheers,
Neil.