lateral balance Question
#1
Thread Starter

When you balance a plane like the 4*, do you do it upside down by the prop shaft and tail gear? When balanced level, if a wing is touched should it drop, no matter which side? I think I have mine balance correctly, when done, both weighed the same and it stayed level unless I breathed on a wing, then it would roll to the side I breathed on. This is a big MF to hang from a string, I put a hook in the ceiling to do it.
#2
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From: BONAIRE,
GA
Sounds like you have it balanced "on-the-money". Most low winged planes should be balanced inverted to provide stability performing the CG operation, for both lateral and longitude.
#3

My Feedback: (-1)
And if you are hang balancing you may want to buy some good nylon string. I bought a roll of it {about 1/16 thick} about 15 years ago and it has never broken. When cranking up a plane to CG or weigh it does stretch though.
Agree, sounds like you have it set correct for the lateral balance.
Agree, sounds like you have it set correct for the lateral balance.
#4
For lateral balancing I use a loop of safety wire inserted under the upper most hinge on the rudder and a string that is run from the prop hub thru the safety wire loop. I tie a loop in the string somewhere near the CG point just so that the plane hangs evenly (neither nose up nor nose down). Most of the plane's mass is below the line between the hinge and the prop hub so it will easily hang even if a wing is out of balance by an ounce. This has worked on low wing, mid wing, high wing and bi-planes.
#5
Thread Starter

I have some really strong string that is used for surveying and laying out framework for decks, or concrete forms. Worked wonders. I essentially did what was mentioned, hung it so it was on the CG of the wing, and other then the slight offset of the motor was right on centerline. If I hung it from the hinge though, it would rip that CA hinge, so I did it from the tail wheel. <div>
</div><div>Thanks for the help, I had a feeling I had it right. </div>
</div><div>Thanks for the help, I had a feeling I had it right. </div>
#7

My Feedback: (-1)
Something tells me you have the nice nylon string if that is what you have been using it for. The nylon is what most contractors use for lining out decks and walls. In my old shop I used the string and plumb bob method to CG. I no longer have the room in my new shop. It's a great way to get a planes CG dead on and get the lateral at the same time.
#8
Thread Starter

Yep thats the string I used. Worked great. Well I must know what I'm doing, I flew the first flight tonight. Had a mishap on my first take off attempt, if I had another foot or two on the left I would have been OK, but clipped the top of the corn and it went in. Cracked the leading edge, no biggy, already made my repairs, but after I retrieved it, I didnt see anything else broken, so I made a second attempt and got her in the air nice and smooth. Hands off it tracked great, just 2 clicks right aileron was all it needed and flew hands off nice and straight and level.
I am just glad I didnt hot dog it, turns out the center rib on the left wing had cracked when it went in. It was a bit loose when I landed and took it apart. All fixed now though, and ready for the next flight.
I am just glad I didnt hot dog it, turns out the center rib on the left wing had cracked when it went in. It was a bit loose when I landed and took it apart. All fixed now though, and ready for the next flight.



