Thread: Point of mechanical engineering "balance"

Originally Posted by Pedro_The_Swift

TD5?

Originally Posted by V8Ian

TD5?

You wish

it is called dynamically balanced.

On helicopters our engineers do a static balance when attaching new blades, then dynamic firstly on the ground, then hover then forward flight at various speeds, so the blade is balanced both horizontally, with weights, and vertically, with aerodynamics. And yes, it does take ages to get right some days

Originally Posted by BigBlackDog

On helicopters our engineers do a static balance when attaching new blades, then dynamic firstly on the ground, then hover then forward flight at various speeds, so the blade is balanced both horizontally, with weights, and vertically, with aerodynamics. And yes, it does take ages to get right some days

In your line of work, I would imagine balance would be relatively important

Hello Big Black Dog and Rambling Boy

Do you mean something like this ... Accessed February 4th 2017 from

https://www.youtube.com/watch?v=8BnES4T1RDk

An oldy and a goodie with really advanced graphics ..... for its time.


Accessed February 4th 2017 from https://www.youtube.com/watch?v=Wm5OmBITBt0

Kind Regards
Lionel

Originally Posted by BigBlackDog

On helicopters our engineers do a static balance when attaching new blades, then dynamic firstly on the ground, then hover then forward flight at various speeds, so the blade is balanced both horizontally, with weights, and vertically, with aerodynamics. And yes, it does take ages to get right some days

Depending on the type of rotor system, what is more difficult to achieve is blade tracking, even when the blades may be both statically and dynamically balanced.

And what is shown in the video with the Chinook is "ground resonance", not out of balance blades.

I used to use an accelerometer coupled to an interrupter on the main mast with a pair of reflectors on the rotor tips. This was connected to a strobe which flashed in sync to the reflectors. I used a pair of "3's" , one reversed and my goal was to form an 8 when the disc was flying correctly.

Biggest problem was the bloody pilots would try to fly to the rotors so I started putting the reflectors out over my shoulder(by shifting the interruptor) so he couldnt see it....that ****ed them off.

yes Old Farang you are correct.