Guide to Multi-blade Main/Tail Rotor heads (450-800 size)

Rigid:

Scale UH-1 Huey Head:

Align has an excellent 4 blade head out there: https://www.helidirect.com/products/align-four-blades-main-rotor-he...

Aliexpress has 3/4/5 Blade heads: https://www.aliexpress.com/item/3256804461926528.html?spm=a2g0o.pro...

and 4 blade tail rotor: https://www.aliexpress.com/item/2261799939652300.html?spm=a2g0o.pro...

PKM (Phuket Hobby Model) makes a 4 bladed Tail Rotor. Send them a message or email from their facebook page to purchase.

Damped:

ALZRC Devil 380 3 Blade Head: https://www.aliexpress.com/item/2251832590643686.html?spm=a2g0o.pro...
- Requires these 420mm blades (5mm root thickness): https://www.aliexpress.com/item/2251832783553535.html?spm=a2g0o.pro...