Today's Message Index:
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1. 12:47 PM - Empty weight and C.G. Location (Hugh McKay III)
2. 05:28 PM - Center of Gravity Calculation (C.G.) (Hugh McKay III)
3. 09:15 PM - Re: Empty weight and C.G. Location (Ken Arnold)
Message 1
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| Subject: | Empty weight and C.G. Location |
Gentlemen:
I have just weighed my kit built Allegro 2000 (empty weight*) to compare
with the published empty weight in the Fantasy Air Flight and Operating
Manual.
* empty weight = weight of plane with standard instruments, engine, coolant,
oil, ELT, & Battery (no fuel and no BRS).
My empty weight* is 320 Kg, or 704 lbs. (Nose wheel = 154 lbs., Right Main
wheel = 270 lbs., Left Main wheel = 280 lbs.)
The Flight and Operating Manual states that the empty weight should be 275
Kg or 605 lbs. I am 99 lbs (16%) heavier than what is published for the
empty weight! The published MTOW is 520 Kg, or 1144 lbs. This leaves me only
440 lbs for a BRS, Fuel and 2 occupants. Those numbers are as follows:
Main fuel tank fuel 14.5 gal. = 88.97 lbs.
BRS = 35.00 lbs.
Wing Tanks Fuel 10.4 gal. = 64.00 lbs.
My Weight = 150.00 lbs
Total = 337.97 lbs.
440 lbs. minus 337.97 lbs is 102.03 lbs max weight for the passenger in
order not to exceed the MTOW of 1144 lbs. With these numbers, in reality I
cant take a passenger unless he is a child or a very light weight adult.
What is the basis of the 275 Kg (605 lbs.) stated in the F and O Manual? I
dont understand why I am 99 lbs over the published empty weight! I have
nothing more in this plane at empty weight* other than what I have stated
above with the *. What are the empty weights running for the ready to fly
Allegros with similar items?
With a total empty weight of 704 lbs. the c.g. is 12.18 inches behind the
leading edge. The maximum allowable distance is 390 mm or 15.35 behind the
leading edge. 12.18 is 81% of the limit. The F & O Manual states that the
c.g. of the empty aircraft is almost exactly the same for the aircraft with
one or two pilots and with an empty or full fuel tank. According to this,
the empty c.g. and the MTOW c.g. stays the same (i.e I do not have to weigh
the plane with fuel, and passengers to calculate a new c.g. . Is this
correct?
I have sent this information to the US Distributor, Fantasy Air USA, but I
would like to get some independent feedback concerning the weight issue (605
lbs. Vs. 704 lbs.). Do any of you know your comparable empty weights, and
would you share them with me? Any and all help will be deeply appreciated.
Hugh McKay
Allegro 2000
Rotax 912UL
N661WW
Message 2
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| Subject: | Center of Gravity Calculation (C.G.) |
Gentlemen:
Have any of you actually calculated the c.g. of your airplane using the
formulas given in the Fantasy Air Flight and Operating Manual (pages 15 and
16)? The terms La, Lt, XSAT, bSAT, bMAC are totally foreign to me. I
believe the term SAT is for Mean Aerodynamic Chord (MAC), but Im not sure.
I do see the term MAC, but is is expressed as bMAC, and I dont know what
this is. Page 16 and the various formulas and the table with * is completely
confusing to me. Has anyone actually used these formulas?
I know how to locate the weight and balance and C.G. of an airplane using
the FAA Weight and Balance Handbook, but page 16 of the Fantasy Air Allegro
2000 F&O Manual is a mystery to me! Can anyone shed any light on page 16?
Hugh McKay
Allegro2000
912UL
N661WW
Message 3
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| Subject: | Re: Empty weight and C.G. Location |
I have a Zenith CH701 kit on order. For the past year of so, I observe
that most builders are significantly over the published empty weight. I
can understand a small overage but nearly 100 lbs over with what appears
to be standard installs is worrisome.
Ken Arnold
CH701 on order
----- Original Message -----
From: Hugh McKay III
To: allegro-list@matronics.com
Sent: Thursday, December 07, 2006 11:41 AM
Subject: Allegro-List: Empty weight and C.G. Location
Gentlemen:
I have just weighed my kit built Allegro 2000 (empty weight*) to
compare with the published empty weight in the Fantasy Air Flight and
Operating Manual.
* empty weight = weight of plane with standard instruments, engine,
coolant, oil, ELT, & Battery (no fuel and no BRS).
My empty weight* is 320 Kg, or 704 lbs. (Nose wheel = 154 lbs.,
Right Main wheel = 270 lbs., Left Main wheel = 280 lbs.)
The Flight and Operating Manual states that the empty weight should be
275 Kg or 605 lbs. I am 99 lbs (16%) heavier than what is published for
the empty weight! The published MTOW is 520 Kg, or 1144 lbs. This leaves
me only 440 lbs for a BRS, Fuel and 2 occupants. Those numbers are as
follows:
Main fuel tank fuel 14.5 gal. = 88.97 lbs.
BRS = 35.00 lbs.
Wing Tanks Fuel 10.4 gal. = 64.00 lbs.
My Weight = 150.00 lbs
Total = 337.97 lbs.
440 lbs. minus 337.97 lbs is 102.03 lbs max weight for the passenger
in order not to exceed the MTOW of 1144 lbs. With these numbers, in
reality I can't take a passenger unless he is a child or a very light
weight adult.
What is the basis of the 275 Kg (605 lbs.) stated in the F and O
Manual? I don't understand why I am 99 lbs over the published empty
weight! I have nothing more in this plane at empty weight* other than
what I have stated above with the *. What are the empty weights running
for the ready to fly Allegros with similar items?
With a total empty weight of 704 lbs. the c.g. is 12.18 inches behind
the leading edge. The maximum allowable distance is 390 mm or 15.35"
behind the leading edge. 12.18" is 81% of the limit. The F & O Manual
states that the c.g. of the empty aircraft is almost exactly the same
for the aircraft with one or two pilots and with an empty or full fuel
tank. According to this, the empty c.g. and the MTOW c.g. stays the same
(i.e I do not have to weigh the plane with fuel, and passengers to
calculate a new c.g. . Is this correct?
I have sent this information to the US Distributor, Fantasy Air USA,
but I would like to get some independent feedback concerning the weight
issue (605 lbs. Vs. 704 lbs.). Do any of you know your comparable empty
weights, and would you share them with me? Any and all help will be
deeply appreciated.
Hugh McKay
Allegro 2000
Rotax 912UL
N661WW
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