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Best method to splice longerons/spars.

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Best method to splice longerons/spars.

Old 09-28-2010, 12:39 AM
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Sessholvlaru
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Default Best method to splice longerons/spars.

I am building a giant scale plane where getting longerons of the proper length is not going to happen. What is the strongest method to join lengths together? 30 degree angles? "L" shaped joints? Thanks.
Old 09-28-2010, 01:03 AM
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Andrewmc
 
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Default RE: Best method to splice longerons/spars.

For splicing longerons I have used scarfe joints - shallow angle diagonal ratio 1:5, ie 6mm thick longeron with a 30mm joint length - roughly 11 degrees. Bond with titebond and clamp till dry. I have used this for spruce to spruce, balsa to spruce and balsa to balsa. The important thing is to get the faces matching. To to this I have tapes the two pieces of wood together and sanded them together on a disc sander.

The photo is of a 1/4 scale tiger moth fuselage, joining 1/4" spruce to 1/4" balsa to create a 6ft longeron.
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Old 09-28-2010, 01:36 AM
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big max 1935
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Default RE: Best method to splice longerons/spars.

They use a 12 to one scarf joint on full size planes so the same should be OK for models . Also watch the wood grain. Have a good build ,Max H.
Old 09-28-2010, 11:39 AM
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Default RE: Best method to splice longerons/spars.

Thanks guys!
Old 09-28-2010, 12:52 PM
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Default RE: Best method to splice longerons/spars.

http://en.wikipedia.org/wiki/Scarf_joint

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