I am about to make the spacers for my center spar and am looking for some help and or comments.  Unless I am misreading things, per my plans the length of the 10 spacers in the center spar is 16.9mm or .0665".  The root end of the wing spar is also .665",  is this really a "0" interference fit or am I in error?  As usual any help or comments would be welcomed.

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Tim:

Feel free to contact us at Zenith directly if you need any help interpreting the plans. 
Our staff engineer, Caleb, is your best resource for this.

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Hello Sebastien,

I normally do and have enlisted Caleb's help in the past. Caleb's support has been super, I can't say enough about his and Zenith's help. I just thought I might be overlooking something that someone might point me to before I troubled Caleb again. Thank you for your response ...

Tim,

I think it's meant be that way.  Parts that big could have a significant interfance fit and you'd never know it. The parts I made were that way, then add primer between each layer of the wing spar, and you have more interference than just adding all the material thicknesses would provide.   There's plenty of spring in the material to make up for it.

Dan

Thanks for your reply Dan. I will still check with Caleb per Sebastien's advice, but I think your probably right. Something else I just thought about is the sanding and polishing of the pieces in the wing spar will probably pull a few thousandths off also.

Is there two Calebs?

Steven, I don't know, Caleb Gebhardt is who I have received a lot of help from.

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