Engine for NX7 Sport Flying?

[spartan2381]

I'm thinking about picking up a NX7 and wanted to know from the list below what would be a good engine for sport flying and long flight time.

1.O.S 91HZ-R 3C Speed
2.O.S 105HZ
3.O.S 105HZ-R
4.O.S GT15HZ Gas
5.Y.S 91SRX_Tareq
6.Y.S 120SR
7.Y.S 120SRX

[Russell Bear]

I have run the OS 91HZ and the 105HZ in mine. Both offer plenty of power for any sport flying you wish to do with the 105 having more punch (as well as more fuel consumption). Can't go wrong either way. Easy to tune and run great with no regulator / check valve hassle.

[spartan2381]

Thanks for the recommendation. If I go with the O.S 91HZ-R 3C Speed what pip would you recommend?

[u8at711]

The -R at the end of the OS engine model number stands for regulator.
Just saying