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Old Jan 13, 2007, 03:35 PM
Flying Griffins
Milner GA
Joined Sep 2004
30 Posts
Help!
Hanger 9, P-40, 60 size. CG

Need a little help in balancing my P-40. Have a Saito 100 in place. Manual states CG with Wheels up is 3" back from leading edge against the fuselage.

I have moved the battery up front over the fuel tank and have added about a quarter-pound of lead up front under the fuel tank. Not enough yet.

Can anyone give me an idea of about how much weight (lead) is needed to balance the P-40 ?

Thanks,
Terry
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Old Jan 13, 2007, 04:10 PM
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Viper427's Avatar
Milton Keynes UK
Joined Aug 2006
236 Posts
Quote:
Originally Posted by GeorgiaBoy
Need a little help in balancing my P-40. Have a Saito 100 in place. Manual states CG with Wheels up is 3" back from leading edge against the fuselage.

I have moved the battery up front over the fuel tank and have added about a quarter-pound of lead up front under the fuel tank. Not enough yet.

Can anyone give me an idea of about how much weight (lead) is needed to balance the P-40 ?

Thanks,
Terry
Sounds to me like something is wrong there, H9 planes balance very well with the recomemded motors,

not being funny but how are you balancing it? on your fingers?, i did this with my P47 and had to put a mass of lead in the nose, when i put it on a balance machine it was far to heavy in the nose and i ended up taking it all out again.
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Old Jan 13, 2007, 04:53 PM
Flying Griffins
Milner GA
Joined Sep 2004
30 Posts
Thanks for the reply.......yes I am balancing on my fingers. It has worked in the past. will start looking for a balance machine.
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Old Jan 13, 2007, 04:59 PM
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Viper427's Avatar
Milton Keynes UK
Joined Aug 2006
236 Posts
Quote:
Originally Posted by GeorgiaBoy
Thanks for the reply.......yes I am balancing on my fingers. It has worked in the past. will start looking for a balance machine.

the one i have is a great planes c of g machine.
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Old Jan 21, 2007, 02:26 PM
Flying Griffins
Milner GA
Joined Sep 2004
30 Posts
I did purchase a GreatPlanes CG Machine. I have assembled everything - fuel tank in place, battery over fuel tank, Saito 100 w/muffler, 3.25 spinner w/ 14-9 prop. Wheels are in retrack position. Balancing on the new CG machine 3" from leading edge. It will take 7-8 oz of lead to balance. Cowling is in place.

Anybody have any suggestions or comments
Thanks much, Terry
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Old Jan 21, 2007, 02:59 PM
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Viper427's Avatar
Milton Keynes UK
Joined Aug 2006
236 Posts
rather than sticking lead in the nose (useless weight) why not use a second battery pack to run the retracts or a 6 volt pack perhaps...
i like to run a seperate battery for the retracts..
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Old Jan 21, 2007, 05:18 PM
Registered User
Fulton.Mississippi
Joined Mar 2006
120 Posts
Just a thought.Are you flipping it over and balancing it upside down?Isn't that the way that plane is balanced?
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Old Jan 21, 2007, 06:49 PM
Flying Griffins
Milner GA
Joined Sep 2004
30 Posts
pumpkin438....yes I balanced the plane upside-down. Viper427....I will look into going to a 6 volt battery pack. If I want to use a second battery pack for the retract, how do I connect (wire) the second battery pack?

Thanks much, Terry
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Old Jan 22, 2007, 11:06 AM
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Milton Keynes UK
Joined Aug 2006
236 Posts
It's simple enough you will need a "Y" lead, plug your retract servo and retract battery into the "Y" lead, the end that plugs into the reciever need to have the red wire removed, so the retract battery is only powering the retract servo and not the reciever...

someone has posted a pic of this set up, will see if i can find it for you.
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