spar splice 2

Aircraft wood spar spilice

[@Nimbus2Ifly]

Thanks Larry, wood is fun to wok with and with low tech tools you can do a lot, wood aircraft projects come cheap. I wish I could do it all the time. I am a A+P IA with 30 + years in the field and still working, but my love for restoration comes 3rd after family and work so things take a lot longer than one would like.

[@gthree0239]

I’m an A&P (work as a pilot) and would love to start using my A&P more. I love learning these old school skills and would love to do this kind of work more frequently. It’s just very very hard to break into the field part time. The last few years I’ve maintained my clubs Aeronca Champ 7AC. If I can get my IA soon I might start a project with a tube and fabric aircraft (tri pacer or something) for the experience.

[@louisvanrijn3964]

Hi Nice wood work. I donot understand why the lower holes for the wing strut are so close to edge... In the middle of the spar the bending stress is theoretically zero, hence it would be a better spot to drill. (stronger for the same money) The splice is not made with the recorcinol-formaldehyde adhesive, but with something else. Polyurethane adhesives and epoxy based adhesives have good long term properties too. But where is the evidence? Aerodux (= resorcinol) claims to have 24 hrs joint endurance in boiling water...quite a test!

[@Nimbus2Ifly]

Not sure but that is the way they were built in 1941

[@louisvanrijn3964]

@@Nimbus2Ifly OK, 1941 you said. In 1941 the DH-98 Mosquito was just off the drawing table, a marvel of wood engineering. And the German Me 163 rocket-fighter with its wooden wing(!) flew 1004 km/h. (in secrecy, but it did.) Propeller blades of the FW 190 were of laminated beech wood... So: wood is not a 'bad' aviation material. Groeten uit N.L.

[@Nimbus2Ifly]

As we know the only FAA approved glue as described in AC43.13 is resorcinol but there are many types of glue that are currently on the market today that are as good or better than a glue first made 70 years ago, I have also seen many a resorcinol glue bond go bad after many years. Spring clamps are a good idea...

[@flyswryan]

It's better to use spring clamps for your scarf joints as they maintain a more constant pressure when the wood sucks in the glue, shrinking the glueline...especially with resorcinol, the only FAA approved wood glue.

[@nobodyyouknow222]

More nice work demonstrated by John Bentley. When I find a home for the bellanca, I will probably get a wooden homebuilt. John demonstrates how a person using simple tools can build or repair an aircraft to FAA standards for certified aircraft. There are plenty of good designs: Jodel, Taylor ( both Molt and John), and others that are proven, and available cheaply on the used market. Like wooden boats, they aren't for everybody.

[@NateG3678]

What glue did you use? Very nice work!

[@hadleymanmusic]

Sure is a short splice.

[@louisvanrijn3964]

Hi Nice wood work. I donot understand why the lower holes for the wing strut are so close to edge... In the middle of the spar the bending stress is theoretically zero, hence it would be a better spot to drill. (stronger for the same money) The splice is not made with the recorcinol-formaldehyde adhesive, but with something else. Polyurethane adhesives and epoxy based adhesives have good long term properties too. But where is the evidence? Aerodux (= resorcinol) claims to have 24 hrs joint endurance in boiling water...quite a test!