Got a problem with my wooden spar.

[Lou]

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]

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

[Morgans[_2_]]

"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

[Lou]

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_and_Guidance_Library/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