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Re: Pitotube routing hole...
I found this in the build manual so I guess it is ok then?
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Senior Member
Re: Pitotube routing hole...
If I'm seeing the pictures correctly:
1. It appears that the builder followed the instructions.
2. The hole appears to be on the neutral axis.
And,
1. if it isn't larger than17/64 in height, and
2. there aren't any sharp edges or burrs,
You should be good to go.
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Re: Pitotube routing hole...
The hole is slightly bigger now on the highest point, 11.5 mm in height.
Maybe email kitfox and get opinion?
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Senior Member
Re: Pitotube routing hole...
I'm not familiar with the rib numbering convention for the Model 2. Is the hole inboard or outboard of the lift strut attachment?
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Re: Pitotube routing hole...
The hole is inboard from the attachment.
I emailed kitfox and they don’t recommend any drilling in the spar.
Deaney Aircraft however did...Kitfox recommended structural repair according to Ac 43-13
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Senior Member
Re: Pitotube routing hole...
The inboard loads on the spar of a strut braced, high wing aircraft are a tad more complex that one might think; maybe there is someone lurking here that has the background to supply enough information to help you make a decision. Clearly Denny aircraft called for the hole but the issue now is that it is larger - how much larger is too much larger? That is the question. I couldn't spend much time in AC43-13 this evening but I couldn't find any instruction related to repairing a spar, let alone a round spar. My only suggestion is to see if you can get in touch with a DER (or, equivalent) for his/her advice or analysis. It may cost you a bit but might be a lot cheaper than the time and cost of a new spar/wing panel. Or, maybe a structures engineer is reading this and can assist.
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Re: Pitotube routing hole...
I have decided to to replace the spar, the other wing has a dent in the front spar as well so will be replacing that one to.
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Senior Member
Re: Pitotube routing hole...
I'm sure you put a lot of effort and time into making the decision and it wasn't easy - BUT - I'll bet you'll sleep better. Keep us posted on progress through your rebuild.
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