2 & 4 stroke engines, initial-alternative propellers
January 22, 2017
Each RC engines manufacturer provides the modeller with a list of propellers that fulfill the specifications of each engine. Depending on the use, the type of model, and the specs of each engine, there is a list of initial and alternative propellers that are suitable.
Generally the higher propeller pitch equals to greater cruising speeds whilst smaller pitch gives greater climbing ability. Initial propellers are made with the average pitch, with which every model designed for the specific engine can fly. It’s advisable to use these initial propellers because on many occasions they are close enough to the proper pitch. Later, by testing you can obtain the maximum performance from your model using the alternative propellers. If none of them performs better, then continue using the initial one. Find below a list of propellers for 2 and 4 stroke engines.
2 STROKE ENGINES
4 STROKE ENGINES
Below are some safety thougths that although seem basic, they still need to be repeatedly kept regarding propellers and their use. They apply not only to small birds but especially to their giant scale brothers!
1. Install the prop with the curved side of the blade facing forward and tighten the prop nut or allen bolt(s) with the proper size wrench.
2. Recheck the tightness of the nut or bolt(s) often, especially on wood props which tend to compress and loosen more often.
3. When starting the engine, keep spectators at least 15 meters clear of the model and out of the path of the propeller.
4. Keep hands away from the prop as much as possible. Use a chicken stick or and electic starter.
5. Keep face and body out of prop arc as soon the engine is started and run.
6. Make all adjustments from behind the prop except on pusher prop installations.
7. Never throw anything into the prop to stop the engine. Use a kill switch or pinch off the engine’s fuel supply if it is accessible.
8. Discard any prop with nicks, scratches, splits, cracks or any other sign of damage. Never attempt to repair, alter or bend a prop.
9. Don’t run an engine in areas of loose gravel or sand for the prop can throw such material into your face and eyes. It’s not a bad idea to wear eye protection.
10. Keep loose clothing, shirt sleeves, and other such items away from the prop and avoid carrying objects that can fall into the prop such as pens, screwdrivers, etc.
11. Be sure to keep the glow driver wire out of the prop path.
12. If a spinner is used, be certain that it’s edges are not in contact with the propeller blades.