Hi Lawrence,the Main Blades that you need for your helico.if you choose a wooden Blades they are 790MM long and there is one paire in Montréal Canada at UDISCO Send an E-Mail to MARC the address is [email protected] If you prefer a Carbon Fiber Blades they are 800MM long NHP RAZOR PRO You can buy them in California USA the e-mail adress is WWW.HELI-WORLD.COM Hoping it will Help. Claude Q.