RC Retrieve Boat Propeller Size Recommendation

[Dual-500]

Looking for a starting point for prop size.

Boat will be a retrieve tug, flat pan type hull with some auxillary outrigger flotation. Fiberglass boat pan is 28" long and 10" wide.

https://www.ebay.com/itm/224024561880

Will be setup with twin motors, battery packs, ESC's, props - flex drive, submerged prop/struts.

2 x 3S 5200 MAH battery packs
2 x Leopard 3650 1480kv motors 5mm shaft
2 x OSE Raider 6s 90amp ESC's

Looking for a starting point for Octura beryllium propeller size for twin prop setup. It's a tug, so speed isn't in the equation, needs to have some grunt to push/pull a 90 size nitro outigger.

Thanks much!

[dasboata]

looks like Octura does not have anything smaller then 27 mm which is a 1/8 shaft , your going to have to look what you can find in 5mm