Table 3:
Safety factor derived from strain gauge data for a fan at full and part speed without a fitted stabilisation ring.
Fan type
% Full speed
Normal operation safety factor
Stalled operation safety factor
Plane casing, stalling blade angle
100
2.3
0.3
Plane casing, stalling blade angle
50
10.0
2.5
Plane casing, stalling blade angle
25
106.0
7.3