The differences are subtle but there are some that are major for the first and most important its a larger displacement. 1.10 vs the 0.91....As for operational its the same basically. I would say depending on the fuel you choose you could likely go to a slightly larger prop. Maybe a 14-11 or 14-12. Again it depends on the circumstances. You should really look into the APC props as they are much more efficient that anything else out there. The other molded props tend to flatten out as they run up and they also flex a bunch. This means that the work of the engine is not getting transfered to the air efficiently. You might see a huge performance increase going to the same prop in an APC.

What ever you do try to run the 91 and 110's up above 9000rpm say 9200-9500 is my target. You can load the 110 a little lower say 8800 but I would not try to run the 91's down this low in the rpm range. They just work too hard and can create more heat...but 8800 is OK on the 110's I prefer higher. 9200-9500. The first 110FZ on 30% heli Cool Power will turn a 14-12 at 9500-9600 at my Arizona 1000ft above sea level.


Less nitro means use less prop, going to sea level will give you better performance. Going up in elevation to say Denver area at 5000ft you will have to lower the prop load to get the desired RPM

Troy Newman
Team YS