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Old Nov 04, 2012, 12:53 AM
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Joined Apr 2012
81 Posts
Question
3 ch foam plane rolls hard when turning

Hi iv just built this foam plane from dollar tree foam its a 3ch with a 40'' span and the fuse is 27''

Im having a prob with it wanting to roll pretty hard and nose down when i turn is this a lack of dihedral or something else any help would help
Thanks
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Old Nov 04, 2012, 01:33 AM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
1,737 Posts
Yes, I also think it's a lack of dihedral. You'd get a better explanation from the gurus on the science forum
http://www.rcgroups.com/modeling-sci...?sort=dateline
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Old Nov 04, 2012, 02:09 AM
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Thanks
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Old Nov 04, 2012, 03:01 AM
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Australia, QLD
Joined Apr 2012
360 Posts
You want it to roll dont you? Or is it a uncontrollable roll? No dihedral and it would just spin in turns. The dihedral helps the plane to bank so it sorta simulates an aileron turn. Is this beyond a slight banking?
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Last edited by micka80ella; Nov 04, 2012 at 03:27 AM.
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Old Nov 04, 2012, 10:44 AM
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I put a lil more dihedral in the wing last night and flew it again it seemed to help for the most part but it still seems to fly a little bit weird ill take a vid. to show what im talking about
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Old Nov 04, 2012, 10:59 AM
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Canada, BC, Williams Lake
Joined Jan 2010
4,367 Posts
Looks to have a short nose and long tail , where is the COG?
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Old Nov 04, 2012, 02:04 PM
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its 2.75" from the front of the wing my wing is 8" wide
is that about rite
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Old Nov 04, 2012, 05:14 PM
Build straight - Fly twisty
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Australia, QLD, Little Mountain
Joined Feb 2010
4,408 Posts
That v-stab is way too small. give it about twice the area and you'll be good to go.
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Old Nov 04, 2012, 05:23 PM
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are you talking about the rudder area or the whole tail end im new to this stuff sry
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Old Nov 04, 2012, 07:04 PM
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Canada, BC, Williams Lake
Joined Jan 2010
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v-stab stands for Vertical stabilizer which the rudder is part of . Anyone else think 2.75 might be a little to far back ? did you use a calculator ?

http://adamone.rchomepage.com/cg_calc.htm
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Old Nov 04, 2012, 08:35 PM
Build straight - Fly twisty
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Australia, QLD, Little Mountain
Joined Feb 2010
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Give it something like this:
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