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Old Jan 25, 2013, 02:26 AM
Registered User
Egypt, Alexandria
Joined Sep 2011
23 Posts
Help!
3 sections 2.4 meter glider

Hello There
I'm building the blu guppy glider but i want to make a three sections wing
it is made entirely from foam board with sd7037 airfoil wing ribs from foam
the center section is 75 cm
the outer section are 82.5 cm each
my question is about the the joining mechanism
i have 2 methods in mind

1- having a carbon tube extending out the center section about 24 cm to go through the outer section in a foam channel.

2_or as above 24 cm tube through the outer section but going through holes in foam ribs with 3mm ply wood on each side of each rib.
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Old Jan 25, 2013, 12:18 PM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
1,742 Posts
#2 is not so clear.
Will the outer sections have a dihedral?
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Old Jan 25, 2013, 01:25 PM
Registered User
Egypt, Alexandria
Joined Sep 2011
23 Posts
Quote:
Originally Posted by djacob7 View Post
#2 is not so clear.
Will the outer sections have a dihedral?
yes the outer section have dihedral
center section is 75 cm "flat" outer section is 82.5 cm "60 cm 4 degrees dihedral and 22.5 cm flat glued together "
so the junction between outer and center section is flat
in method 2
i make a hole in each foam rib"made from 10 mm foam board" and glue 3mm plywood on each rib side and pass the carbon tube through the holes
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Old Jan 25, 2013, 02:11 PM
Registered User
Egypt, Alexandria
Joined Sep 2011
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photo

here is a picture of outer and center sections
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Old Jan 25, 2013, 03:26 PM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
1,742 Posts
As long as the CF rods go through at least two ribs I think you're OK. Assuming that the CF rods are themselves strong enough. That's a lot of wing area on the outer sections that the rods have to support.
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