I would also like to say i have been talked out of a 4 blade head for my scale EC 135 it looks great when its flying and you cant tell
if you want to go scale with your MD500 you would need a 5 blade head and they dont fold up with a blade caddy as well as a 2 blade setup .
if you still want to go with a multi blade head get the "flapping" one not the fixed blades they are still very "twitchy" but not as bad as a fixed head
Talking about rivet counting how many people would know how many blades a full size MD500 has
phil.