What prop size for 2 AQ 2030 powered boats?

[Andris Golts]

Hi all finally finished a tunnel and a rigger. Now that i have discovered using to small a prop can cause the same damage as one to big i need input. The first boat is a JAE .21 FE AQ 2030 motor 120 amp esc Giant power 4s 5000 mah 65 c lipo .What min dia prop ? What max dia prop ? Second hull is a Dunlap outboard wood over foam tunnelhull 30'' in length AQ 2030 motor 120 amp esc Giant power 4s 5000 mah 65 c lipo .What min dia prop? What max dia prop ? Regards Andris Golts.

[grsboats]

For the Jae you can go with 1450 (46mm) or H-5 and H 7. Gill

[HTVboats]

On the tunnel side the AQ 2030 and a 42X55 Grim Racer prop is a perfect match. An M445 with a reduced diameter seems to be the heat racing choice. Safer to go with the 42X55 for sport running as the M445 can kill your electronics if your not careful.
Mic