Originally Posted by
HeliComparator
MGB and mounting very similar in basic principle, but the devil is in the detail and inside there are major differences in materials etc. Although the L and L1 are identical I think? The AS332L and L1 had a head with conventional bearings, the L2 and 225 have no conventional bearings in the head, just elastomeric thingies (multilayered blobs of rubber and metal discs). More blades on the 225.
The L2 and the 225 share the same epicyclic module which is different for the L and L1, the 332L2 and 225 have two stages of eight gears, not sure of the L and L1 have 7 or 9 gears per stage. The main module for the L2 and 225 are basically the same configuration with material changes to the gears of the 225 main module to take account of the higher power/operations temps. The L2 has a conical housing on top of the epicyclic with two races of ball bearings to take the lift loads, the 225 has a flared housing with two rows of inclined roller bearings to take the lift loads. The 225 also has the EM lube system