Mast Bumping

[cfarsr]

I couldn't find anything out about the Mi8 is immune to mast bumping and for the life of me I couldn't get the rotor separate in a low g pushover (high g to low g). I imagine you all will get around to it sooner or later much like you did with the Huey.

 

On the other hand great job so far BST.

 

Chris

 

(edit to moderator, I apologize and put this thread in the wrong section; flight dynamics)

Edited July 4, 2014 by cfarsr

[Shahdoh]

The design of the rotor is completely different on the Mi8 and thus will not mast bump ( at least in the same manner/conditions) as the Huey. If I remember right, the 2 blade rotor is attached as a single peace, so, as 1 side of the rotor goes up, the other must go down. Flex will occur, but the way it is hinged, will still force the opposite side in the opposite direction. Thus, under certain conditions, if 1 blade has significant more lift then the other, will cause enough movement, that the hinge portion makes contact with the mast. With enough force or repeated contacts, will cause structural failure and the rotor will separate.

[cfarsr]

Ah, that would explain why I could get the tail boom to come off but not the rotor.

 

Thanks

[AlphaOneSix]

Mi-8, as mentioned, is immune to mast bumping, as are all helicopters with fully-articulated rotor systems.

[cfarsr]

Many thanks, learn something new every day.

[Udat]

Only helicopters with two-bladed, semi-rigid, underslung main rotors are susceptible to mast bumping. It is s the underslung part that actually makes mast bumping possible.