Weight and Balance
Posted: Fri Feb 17, 2012 9:21 pm
I thought some of you guys might be interested in these calculations for
weight and balance. Because what I have been told by MAM, I was concerned
with my weight and balance for I never cut back the firewall on a standard
Rebel with an 0320. So I weighed my plane today, minus prop and battery, and
used calculations to check different locations for the battery with
combinations for wood and metal props.
I calculated a metal prop at 38 lb. and a wood prop at 10 lb. The battery and
box at 24 lb. MAM's recommendation for most forward is 10.85 and most aft is
18.10. Here were the best locations;
With a metal prop and the battery located in the middle of first bulkhead,
aft of the baggage compartment, the empty C&G was 8.38. The most forward
loaded C&G problem was 10.70 and the most aft loaded problem was 17.66.
With a metal prop and the battery located in the middle of the first bulkhead
forward of the elevator pulleys (way back in the tail), the empty C&G was
8.88. The most forward loaded C&G problem was 11.09 and the most aft loaded
at 17.90
With a wood prop and the battery located on the firewall, the empty C&G was
7.71. The most forward loaded C&G problem was 10.22 and the most aft loaded
problem 17.42.
I believe the best combination was the metal prop and to locate the battery
in the middle of the first bulkhead aft of the baggage compartment where it
is more accessible without climbing inside the fuselage. With some survival
gear and a few tools behind the seat this should work out real good.
The empty weight was 936 lb. The plane is unpainted so I'm guessing it will
put on 25 more lb. with most of it aft of the Datum. This will push the empty
C&G back even a bit more.
Blue skies and tailwinds
Bruce G
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weight and balance. Because what I have been told by MAM, I was concerned
with my weight and balance for I never cut back the firewall on a standard
Rebel with an 0320. So I weighed my plane today, minus prop and battery, and
used calculations to check different locations for the battery with
combinations for wood and metal props.
I calculated a metal prop at 38 lb. and a wood prop at 10 lb. The battery and
box at 24 lb. MAM's recommendation for most forward is 10.85 and most aft is
18.10. Here were the best locations;
With a metal prop and the battery located in the middle of first bulkhead,
aft of the baggage compartment, the empty C&G was 8.38. The most forward
loaded C&G problem was 10.70 and the most aft loaded problem was 17.66.
With a metal prop and the battery located in the middle of the first bulkhead
forward of the elevator pulleys (way back in the tail), the empty C&G was
8.88. The most forward loaded C&G problem was 11.09 and the most aft loaded
at 17.90
With a wood prop and the battery located on the firewall, the empty C&G was
7.71. The most forward loaded C&G problem was 10.22 and the most aft loaded
problem 17.42.
I believe the best combination was the metal prop and to locate the battery
in the middle of the first bulkhead aft of the baggage compartment where it
is more accessible without climbing inside the fuselage. With some survival
gear and a few tools behind the seat this should work out real good.
The empty weight was 936 lb. The plane is unpainted so I'm guessing it will
put on 25 more lb. with most of it aft of the Datum. This will push the empty
C&G back even a bit more.
Blue skies and tailwinds
Bruce G
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