Got a problem with my wooden spar.

I was working on one wing when the other wing (and I'm guessing)
vibrated of the supports onto the concrete. It broke the end rib which
I will have to build a new one. but it also broke one of the two 3/4 x
3/4 parts for the rear spar 12" from the end. Any ideas on how to fix
this? I'm thinking it's going to take cutting the broken part out in a
scarf style cut and replacing with a scarf joint, then sistering
another part onto the inside. Then just for the heck of it T-88 a
piece of ply across both parts at the joint. Anyone want to comment?
Lou

It sounds like you have the right idea, AC43 gives good guidence, a
good repair job can potentially be stronger than the original stock

See Page 1-15 of the link
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/99c827db9baac81b86256b4500596c4e/$FILE/Chapter%2001.pdf

Doug

On Jun 3, 6:23 pm, Lou wrote:
I was working on one wing when the other wing (and I'm guessing)
vibrated of the supports onto the concrete. It broke the end rib which
I will have to build a new one. but it also broke one of the two 3/4 x
3/4 parts for the rear spar 12" from the end. Any ideas on how to fix
this? I'm thinking it's going to take cutting the broken part out in a
scarf style cut and replacing with a scarf joint, then sistering
another part onto the inside. Then just for the heck of it T-88 a
piece of ply across both parts at the joint. Anyone want to comment?
Lou

"351DP" wrote in message
...
It sounds like you have the right idea, AC43 gives good guidence, a
good repair job can potentially be stronger than the original stock

See Page 1-15 of the link
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/99c827db9baac81b86256b4500596c4e/$FILE/Chapter%2001.pdf

Yep, you can't go wrong following AC-43.

I would add one caution, though. (to the OP)

Be careful about beefing the joint up with a bunch of doublers and stuff.
You could make that area so strong that it creates a stressed area where the
repair ends. Out towards the tip, that is likely to not be much of a
problem, as if it were closer to the middle or root of the wing, but it
still is worth thinking about.
--
Jim in NC

On Jun 4, 1:12 am, "Morgans" wrote:
"351DP" wrote in message

...

It sounds like you have the right idea, AC43 gives good guidence, a
good repair job can potentially be stronger than the original stock

See Page 1-15 of the link
http://www.airweb.faa.gov/Regulatory...ry/rgAdvisoryC...

Yep, you can't go wrong following AC-43.

I would add one caution, though. (to the OP)

Be careful about beefing the joint up with a bunch of doublers and stuff.
You could make that area so strong that it creates a stressed area where the
repair ends. Out towards the tip, that is likely to not be much of a
problem, as if it were closer to the middle or root of the wing, but it
still is worth thinking about.
--
Jim in NC

Thanks guys, it helps to know your on the right track.
Lou