Visit the Propeller Database
Choosing a Nitro Boat Propeller for a nitro powered boat is easier than choosing a prop for an electric model, for example. As an advantage to Nitro boats, prop selection is a lot more predictable. Ranges can be provided for a nitro hull of any hull type. This immediately allows a boater to have a prop that will work for the first test run. From here it is required to test as many props as possible that fall in to this range. It is impossible to specify the exact prop that would best suit a specific setup. A GPS unit, or another form to monitor performance, and handling can be used to see which prop performs the best in general.
Stock Nitro Engines will require in most cases the larger props in a specified range. Modified engines will tend to require smaller props with in a specific range, due to an increase in RPM. This may be the complete opposite of what a new boater to Nitro boating would figure. However, an increase in power for a nitro engine, may lead to a decrease in torque with an increase in RPM. This increase in RPM is what ultimately provides the extra power.
Mono Hull
3.5cc – 40-45mm – X445, X640, X642, S215, S220
7.5cc – 47-57mm – X646/3, X450/3, X452/3, X455, X457, S230, S235
11cc – 56-62mm – X457, X457/3, X460, S240, S245
15cc – 60-65mm – X460/3, X462, X465, X665, S255, S260, S265
Catamaran
3.5cc – 37-42mm – X437/3, X440, X440/3, X640, X642, S215, S220
7.5cc – 46-51mm – X447, X447/3, X548, X646/3, X648, S230, S235
11cc – 55-60mm – X455/3, X457/3, X460, , S245, S250
15cc – 60-65mm – X460/3, X462, X465, X665, , S255, S260, S265
Tunnel Hull
3.5cc – 37-42mm – X437/3, X438, 1938, X440, X440/3, X637, X640, 1640, S215, S220
7.5cc -46-51mm – X646, X646/3, X447, X447/3, X448, x648, S230, S235
Sport Hydro / Outrigger
3.5cc – 45-50mm – 1450, 1650, 1945, X447, X447/3, X448, S220, S225
7.5cc – 47-55mm – 1455/3, 1457, 1457/3, 1950, 1950/3, X455, X455/3, X457, S235, S240
11 cc – 60-67mm – 1662, 1667, 1760, 1957, 2160, 2260, X462, X465, S245, S250
15 cc – 67-70mm – 1470, 1667, 2167/3, 2267, X470, X670,S260, S265, S270
Advantages: 2 Blade vs. 3 Blade when diameter and pitch are equal
2 Blade
– Higher Top Speed
– Less Load on engine
– Engine will turn higher RPM’s
3 Blade
– Higher thrust / Faster Acceleration
– Increased Stability and cornering
– Higher Lift Characteristics
Each hull will perform differently. These general rules do not always remain constant.
Nitro Boat Propeller – 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
Nitro Boat Propeller – PRATHER PROP GUIDE
All general Purpose Props with Pitch ratio’s near 1.5 ranging from 1.5 to 1.6
Prop #- Diameter-Pitch
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