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May i Ask: is it possible to make a 4 blade prop from 2 regelar 2 blade props? just cutting the harts in two slices? And normally the engine needs a 26x10 prop, which regelar blads do i can use for the 4 blades?
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While it is of course possible to assemble two 2 blade props as you describe, the problem is that both are now half of their original thickness in the centre, at the most highly stressed location.
That is why I researched construction of 4 blade props and found how they were made with overlapping laminations.
If you are replacing a 2 blade prop with a 4 blade prop, you will need a smaller diameter but the same pitch.
Broadly...
The pitch determines the theoretical forward motion of the prop through the air for each revolution. This is determined by the desired engine speed, airspeed and thrust.
The diameter determines the effectiveness of the prop at turning rotary motion into forward thrust, or its 'grip' on the air.
High effeciency props are large diameter and turn slowly, such as those seen on human powered flying machines and rubber powered models.
High power props are smaller diameter and turn faster, such as those seen on control line speed models - some being single bladed!
My 4 blade prop project has been stalled for some time, while other projects have taken priority. I'm hoping to get back onto it soon.Comment
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