I have cored out the in-board area of my wings ahead, inbetween and behind the spar areas and still retained the strength.
Mike is right about keeping the mass more towards the center of inertia. It helps in all aspects of rotation.

I save about 1.5 to 2 oz overall with this method. Thats only about 5% weight savings on a finished wing but it all adds up.

Mike Harrison told me to think of saving weight in percentages and you will see the overall picture on weight savings a little better.
Buy a tail wheel that is 20% lighter then then the one you use now. If you think in those terms you will come out a lot lighter in th eend then you think. 20% here, 10% there and before you know it you just saved 5oz in the whole build.

Lance @ AeroSLave has used the buried wire method in core his wings with good success. You may want to ask him about the proccess that he uses. email him at www.aeroslave.com


Smooth FLying...

Wayne Galligan