Hi guys I was wondering why all the plan built aircraft's use older technology and most cruise less than 200 knots I was wanting to use a bigger engine and cruise a little faster.I am wanting to design and build a glasair III or nemesis nxt type of aircraft and want to use composite construction. I am looking for help and ideas on some recommend books on designing a airplane and software. Also do you guys think I should some other plans to use as a guide Thanks