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11-03-2009, 03:48 PM
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#1 | ||
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Member
Join Date: Oct 2007
Location: Lewiston, Clarkston valley
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Good morning.. Balance point help, please..
Hello everyone... I bought a Bi-plane at the local fly in a few years back and converted it from gas to electric.
I have no clue were to start to balance it. the plane has a straight bottom wing and the top wing is forward about 1 to 2 inches, and tapers back. If I use the bottom wing it's nose heavy, if I use the top wing it's tail heavy. I'm just looking for a good starting point. the two wings are about 34 inches or so span. thanks everyone, and it is cold this morning....... |
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11-03-2009, 04:12 PM
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#2 | ||
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Community Moderator
Join Date: Aug 2005
Location: Sunny San Diego Ca
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LD, can you post a photo of the plane? Someone may know what it is and be able to tell you exactly.
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Electricity... It's not just for light bulbs anymore.
Project Globetrotter Participant 7/09 Wings Across America Participant AirfoilZ Factory Field Rep BMK Designs BMK Designs |
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11-03-2009, 04:18 PM
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#3 | ||
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Still Learning
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Location: North of Boston
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Here's a diagram for finding CG on biplanes with unequal sized wings.
You still have to determine the Mean aerodynamic chord for the swept wing. If you get me the wing area of each wing I can help you determine the CG. Knowing the plane will help a lot too. Paul |
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11-03-2009, 06:38 PM
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#4 | ||
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Member
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I'll do that...
I'll take a shot of it tonight and post tommorrow, thanks.
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11-04-2009, 04:38 PM
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#5 | ||
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Member
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Here's a coupla pictures of the bipe....
the plane weighs in at 2 pounds all up. both wings measure 36 x 5 inches.
any help would be great, sorry about the phone pics. |
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11-06-2009, 07:00 PM
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#6 | ||
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Member
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I really thought one of you would jump on this...
Nobody knows who made this plane, huh?
I guess I'll "wing" it on the balance point. You have to admit that was good. 
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11-06-2009, 07:01 PM
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#7 | ||
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Community Moderator
Join Date: Aug 2005
Location: Sunny San Diego Ca
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Hedge your bet on nose heavy ok?
It will fly with the balance forward, but not with it aft. |
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Electricity... It's not just for light bulbs anymore.
Project Globetrotter Participant 7/09 Wings Across America Participant AirfoilZ Factory Field Rep BMK Designs BMK Designs |
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11-06-2009, 07:04 PM
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#8 | ||
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Member
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yea, kinda what I thought...
I figured to start at about 50% of the top wing as a starting point.....
I'll let you know after this weekend. 
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11-07-2009, 01:36 PM
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#9 | ||
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Still Learning
Join Date: Sep 2006
Location: North of Boston
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Here's a formula for determining the CG.
http://www.palosrc.com/instructors/cg.htm Determine the cg for each wing, then for the combination with the formula in post three. Paul |
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