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two-seat weight and balance

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Jun 14, 2009 7:38 pm Post subject: two-seat weight and balance

Any chance someone out there in two-seat land have the front page of 

their original W&B they'd care to send as an attachment?



I'm curious about the weights and arms for pilot, passengers, baggage, 

fuel, and the sample loading.



Thanks in advance.

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AuCountry Aviation
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david(at)newlangsyne.com
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Posted: Mon Jun 15, 2009 3:38 am Post subject: two-seat weight and balance

# Any chance someone out there in two-seat land have the front page

# of their original W&B they'd care to send as an attachment?



The original's out of reach at the moment, but here's the information that's

on it (1971 AA-1A):



Basic empty weight 1049# (at) 73.69"

Front seat (at) 92.50"

Rear seat (oh, right...)

Baggage (at)120.00"  (100# max.)

Fuel (at) 84.50"  (132# max.)



CG:

aft limit 80.0"

fwd limit

    75.0" at 1245#

    77.5" at 1430#

    78.5" at 1500#



MGW: 1500# normal cat., 1430# utility



I also have empty weights for a couple of AA-1B's but don't know the model

year:

(1)  1091# (at) 72.44"

(2)  1070# (at) 73.49"



AA-1B aft limit is the same, fwd. limit is simpler:

    75.0" at 1300#

    78.25" at 1560# (MGW)

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Mon Jun 15, 2009 9:49 am Post subject: two-seat weight and balance

Given:  AA1X



Basic empty weight 1049# (at) 73.69"

Fuel (at) 84.50"  (132# max.)   . . . . . .  this tells me the center of 

the spar is at 84.5 inches.

Front seat (at) 92.50"

Rear seat (oh, right...)

Baggage (at)120.00"  (100# max.)

================



Given:  AA5X



Basic empty weight 1458# (at) 83.23"

Fuel (at) 94.81"  (306# max.)

Front seat (at) 90.60"

Rear seat (at) 126.0"

Baggage (at) 151.00"  (120# max.)

Cargo (at) 116.4"  (340# Max)



Here is what is interesting.  The baggage arm (on an AA5X) is behind 

what they give for the coat hook: 105.4 inches.  If you know the coat 

hook, it is right in front of the hat shelf.  From my calculations, the 

trailing edge of the wing is at 129 inches.



The intercom wiring (Option 1) weighs 5.42 lbs at 131.73 inches.  So, 

the CG of the intercom wiring is behind the trailing edge of the wing?



And, why would the Cargo arm (116.4 inches) be 10 inches in front of 

what would have been the rear seat passengers?  The CG of the electric 

flaps is 124.4.



The CG for the 2 ash trays is given as 115 inches.  So, the ash tray in 

the front plus the ash tray in the rear center console has a CG only an 

inch in front of the cargo loading?



I'm going to take some measurements today.

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AuCountry Aviation
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