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Old Apr 13, 2015, 06:33 PM
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Get the Lead IN!

I built a nice DS foamie plank last year, a Canuck Lumberjack. I folded the plane originally and then rebuilt it with a few extra spars. The plane weighs in at around 60 oz, not all that heavy for a 60" plane, but I've run out of room for balancing weight and have had to goop it to the outside. There are 15 oz of lead out there, not including about 10 more ounces inside the plane.

All that lead is generating some drag, and I'm looking for creative solutions to getting some more weight inside. Steel rod? Lead shot? Tungsten powder? The plane is already covered in new stuff but I can live with cutting it open if I can do so cleanly and recover the holes.

The leading edge is already almost all lead slugs from about 1" back.
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Old Apr 13, 2015, 06:36 PM
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Here's a pic of the plane. In front of the ribbon spar is pretty much all balancing weight and battery. I'd be looking to add weight on either side of the rx bay between the ribbon spar and the sub spar. That is still ahead of the CG but not by a lot.
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Old Apr 13, 2015, 08:15 PM
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Can you take some weight out of the tail?

Otherwise reshape
Lead fishing weights with a hammer and anvil to increase the mass density in the nose more than shot.
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Old Apr 13, 2015, 08:23 PM
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When I need to make areas for weight-I heat up a piece of Rebar, Steel square or round tubing with a torch and melt the EPP to make whatever shape needed.I either put in a Carbon tube filled with lead shot mixed with epoxy or if it is a fuse i just put the Epoxy/shot mix in and then re tape, goop,whatever needs to be done-
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Old Apr 13, 2015, 08:30 PM
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You had me at "rebar"...
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Old Apr 13, 2015, 10:20 PM
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Quote:
Originally Posted by Aerogance View Post
You had me at "rebar"...

It works
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Old Apr 14, 2015, 05:42 AM
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Quote:
Originally Posted by RIGAMORTIS View Post
When I need to make areas for weight-I heat up a piece of Rebar, Steel square or round tubing with a torch and melt the EPP to make whatever shape needed.I either put in a Carbon tube filled with lead shot mixed with epoxy or if it is a fuse i just put the Epoxy/shot mix in and then re tape, goop,whatever needs to be done-
Dude,

just put the rebar in and go fly!
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Old Apr 17, 2015, 11:28 AM
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Just to close the loop on this thread, I used solid poured lead plates and went in through the top of the wing. The weights went behind the arced ribbon spar (there is just no room in front of it). I covered the openings with epoxy and microballoons and then a finish coat of spackle to smooth it out. Patched with new stuff.

Because the balance weight was closer to the CG than before, the plane gained a lot of weight. AUW is now 75 oz, at 60" span...should get faster, I hope.
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Old Apr 20, 2015, 07:18 PM
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United States, CA, Boulevard
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Dude,

just put the rebar in and go fly!

There is actually one in the worx
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Old Apr 21, 2015, 11:35 AM
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would that be a JW?
Ryan, my third is about done......
gonna have to make out to boulevard soon!
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