4 bladed prop for a YS120AC
11-29-2007, 10:04 PM
#2
Senior Member
RE: 4 bladed prop for a YS120AC
Normally you need to drop 2-3" of either pitch and or diameter for a 4 blade prop. So a 120Ac would normally run a 15-10. So a 13-10 4 blade would be in appropriate...However more important is the fact you need to run the engine at about 8400-8800rpm. So what every prop you choose should turn in this rpm range. If you turn it lower you may need ot add some nitro to get the rpms up. Cool Power 30% heli is good for this. If you are already running the 30% heli then you need to reduce the prop load.
I have no specific experience with the 4 blade props on the 120AC. The 4 blade props are very inefficient. So if you are looking for power the 4 blade is not going to help you. If you are looking for scale looks like a warbird....usually the performance will suffer a bunch and the prop still doesn't look quite right as the diamter is not what it needs to be....So
Check out APC 4 blade props that have a small selection try the ones in that 13-10 range I think they have a 13.8-10...this might be a little too much load....but you could always trim down the diameter a little and re-balance it.
Troy Newman
Team YS
I have no specific experience with the 4 blade props on the 120AC. The 4 blade props are very inefficient. So if you are looking for power the 4 blade is not going to help you. If you are looking for scale looks like a warbird....usually the performance will suffer a bunch and the prop still doesn't look quite right as the diamter is not what it needs to be....So
Check out APC 4 blade props that have a small selection try the ones in that 13-10 range I think they have a 13.8-10...this might be a little too much load....but you could always trim down the diameter a little and re-balance it.
Troy Newman
Team YS
