| Model |
Gear ratio |
Gear Rate |
MM/M |
#/M |
Remark |
| HRHT20 |
5.0:1 |
6.2:1 |
0.18/260 0.20/220 0.25/160 |
1.5/220 2.0/200 2.5/160 |
One body,one rotor, three spool |
| HRHT30 |
5.0:1 |
6.2:1 |
0.2/260 0.25/220 0.30/160 |
2.0/260 2.5/220 3.0/180 |
| HRHT35 |
5.0:1 |
6.2:1 |
0.25/240 0.30/180 0.35/140 |
2.5/240 3.0/200 4.0/160 |
| HRHT40 |
4.7:1 |
6.2:1 |
0.30/220 0.35/180 0.40/140 |
4/200 5/160 6/140 |
One body,one rotor, three spool |
| HRHT50 |
4.7:1 |
6.2:1 |
0.35/220 0.40/180 0.45/140 |
5/200 6/180 7/160 |
| HRHT60 |
4.7:1 |
6.2:1 |
0.35/280 0.40/240 0.45/200 |
5/260 6/240 7/220 |
