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HeliTorque :: View topic - Mass and Balance
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HeliTorque Forum Index » Ground School

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Mass and Balance
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paddywak
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PostPosted: Tue Apr 24, 2012 5:25 pm    Post subject: Mass and Balance Reply with quote

I thought I would share a handy formula that can be used for shifting masses around for PPL or CPL.

Weight to be shifted/ Total weight = Change in centre of gravity/ distance of weight to be moved

If you know any 3 you can get the other figure!

Example: The loaded mass of an aircraft is 1850lbs
the moment is 154,000
How much mass must be moved from the forward hold 40 inches aft of the datum to the rear hold which is 158 inches aft of the datum?
The CG limits are 86inches forward and 90 inches aft.


The change in CG is ( weight x arm = moment) 1850lbs x 83.24= 154000lbs

so the difference or change in CG is forward limit 86 inches minus 83.24 inches = 2.76 inches

The distance the mass has moved is 158 inches minus 40 inches = 118 inches.

Therefore:

?/ 1850 = 2.57/ 118

? = 43.27

Might come in handy " especially for all you airbus pilots" Laughing Plank Pilot

I have just had a question very similar to this fired at me during an exam, I also had one in my PPL but didnt know the formula then so guessed it. Laughing
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GregNZ
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PostPosted: Tue Apr 24, 2012 10:21 pm    Post subject: Reply with quote

Hey mate,

Very handy little formula that!

How are you getting on?
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CPL(H), FI(H), H269, R22, B206
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paddywak
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PostPosted: Thu Apr 26, 2012 6:31 am    Post subject: Reply with quote

Trying to prepare for Radio Nav at the moment while retaining agk,met, performance,planning and m&b. Thanks for the turbine cd rom mate very useful. Popped down to see richard too at Bicester yetserday to run over traffic loads again (make sure im doing it right).
Hows NZ?
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flip2
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PostPosted: Mon Apr 30, 2012 12:26 pm    Post subject: Reply with quote

Used the same formula recently on a licence conversion... definitely a good one to remember Thumbs Up
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paddywak
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PostPosted: Tue May 15, 2012 7:47 pm    Post subject: Reply with quote

What machine are you working with now Flip?
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flip2
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PostPosted: Mon May 21, 2012 4:12 am    Post subject: Reply with quote

Bell 412's at the moment
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