PROP

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Choosing the right prop for an application is the hardest selection. Too large of a prop will certainly destroy electrical components. Too little of a prop will not get the boat on plane. It's not voltage that destroys motors, it is current and maximum rotational velocity that destroys motors. Current is controlled by the load placed on the motor.

It is recommended to seek advice if one does not know what a conservative prop would be for their specific application. Every combination is different!

Knowing which prop would work best for a hull, comes mostly from experience.

2 cell LiPo 6 cell NiMh – 30mm - 40mm Diameter
4 cell LiPo 12 cell NiMh – 37mm - 46mm Diameter
6 cell LiPo 18 cell NiMh – 40mm - 52mm Diameter
8 cell LiPo 24 Cell NiMh – 45mm – 55mm Diameter
10 cell LiPo 30 cell NiMh + - 48mm+ Diameter

It is extremely important to understand this chart is very basic, and the best or most conservative prop for any given combination may very well be out of this range.

A larger prop increases load. Increased Load will result in an increased current draw. A smaller prop will decrease current draw. Higher prop pitch will increase current draw, a lower prop pitch will decrease current draw.

Larger Props may create stability issues, make it difficult in corners and create torque steer. An advantage to using a larger prop at slower speeds is thrust. Acceleration on plane will be much greater. Efficiency is also higher for larger props as there is less possible slippage.

Smaller props may have higher levels of slippage, slower acceleration out of the hole but have several advantages. They are typically more stable handle well in corners, and don’t veer the hull of course under hard acceleration. (torque steer)

Advantages: 2 Blade vs. 3 Blade when diameter and pitch are equal.

2 Blade
- Higher Top Speed
- Less Load on motor
- Motor will turn higher RPM’s

3 Blade
- Higher thrust / Faster Acceleration
- Increased Stability and cornering
- Higher Lift Characteristics

OCTURA PROP GUIDE

12 Best used for submerged drive Setups. Low Pitch Larger diameter.
X4 are low lift general purpose props
M4 is similar to X4 but with the tongues removed to unload the prop
Y are similar to X series but have 10% more pitch
X5 are similar to X4 with medium lift and more pitch
X6 similar to X4 and X5 with medium-high lift
14 are medium-high lift commonly used for hydros
16 are high lift props for riggers and hydro's
17 are the highest lift prop for riggers and hydros
P7 are similar to 17 series but more rake and slightly less lift
19 are high lift for riggers and hydro's
V9 are moderate lift and high puitch suitable for riggers, hydros and SAW racing
20 are moderatley high lift with high pitch suitable for riggers and hydros
21 are high lift for riggers and hydro's
22 are high lift, highest pitch surface drive only good straight line speed

PRATHER PROP GUIDE

All general Purpose Props with Pitch ratio’s near 1.5 ranging from 1.5 to 1.6

Prop #-DiameterPitch
215-40.6mm-63.5mm
220-43.7mm-66mm
225-46.7mm-71.1mm
230-48.2mm-76.2mm
235-50.8mm-81.3mm
240-53.8mm-83.8mm
245-57.1mm-88.9mm
250-58.4mm-91.4mm
255-61mm-96.5mm