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balancing a biplane

Old 02-01-2016, 08:12 PM
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rye
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Default balancing a biplane

hi
how would u balance a biplane,thanks
Old 02-01-2016, 08:40 PM
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radfordc
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http://www.rc-airplanes-simplified.c...-airplane.html

http://www.modelairplanenews.com/blo...cing-biplanes/

http://www.rcgroups.com/forums/showthread.php?t=1305044

http://www.rcuniverse.com/forum/aero...g-biplane.html
Old 02-02-2016, 07:00 AM
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rye
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thanks but do i balance it upside down or from the bottom of the wing i amusing a greatplanes balancer http://www3.towerhobbies.com/cgi-bin...&I=LXK259&P=ML
Old 02-02-2016, 09:08 AM
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Right side up or upside down doesn't matter. The CG doesn't change.
Old 02-02-2016, 12:25 PM
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Make one of these and you will not mess with that awful balancer again. http://www.rcuniverse.com/forum/tips...g-rig-how.html I can balance my 16# biplane without any issues at all.
Old 02-02-2016, 01:22 PM
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One bathroom scale and a few wooden blocks will give you some awesome results too. A little math involved tho:

http://www.rcuniverse.com/forum/rc-s...-big-boys.html

Several math methods listed there. I have personally used rtstestpilot's method as I have one airplane that used to belong to him and he gave me the spreadsheet when I bought it.

Hope this helps.
Rafael
Old 02-02-2016, 04:14 PM
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RBACONS
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Originally Posted by rye
thanks but do i balance it upside down or from the bottom of the wing i amusing a greatplanes balancer http://www3.towerhobbies.com/cgi-bin...&I=LXK259&P=ML
Assuming the CG falls within the cord of the top wing, you would balance it using the bottom of the top wing. If the CG only falls within the cord of the lower wing, then you would have to balance it upside down using the lower wing.

However, I too prefer using scales to measure the weight on each wheel (in flying attitude) and calculate the CG location.
Old 02-02-2016, 06:35 PM
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52larry52
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The newest issue of Model Airplane News (April 2016) contains an informative 3 page article titled "Center of gravity basics". Pick up a copy as it may answer some of your questions.
Old 02-08-2016, 11:54 AM
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How big is it? I have an 88" Tiger Moth, balance it right side up on my finger tips, no balance rig required.

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