I tried the APC 16.5x5W. I couldn't quite pull it at my elevation. I could only get 8800 RPM. The thrust was the same as my 16x6 at 13lbs 4ozs. If I could have spun it to 9100 RPM or so I'd have been very happy. As it was the thrust was the same but the low RPM loaded the engine too much and overheated it.

At sea level or about...it would be an excellent prop.

Thanks
Barry