built a few of those 2 bladers myself...
tried em on a few diffrant alts..always seemed to vibrate a bit..
built mine out of 2by4 and 2by6--they are fun to carve out..
heres a shot of my minne mill with a 2 blader--its been running 24/7[when theres wind]
for a few years now--it just lites up the L.E.D.s on those arms ..
fun to watch at nite..its powered by two hard drive mags..
