Different Styles of Prop

[jbdww]

I am looking at two different styles of props, and was wondering what, if any, different do they have on flight.

These look more tapered on the ends.
http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=841&productname=

These seem thicker.
http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=923&productname=

Thanks

 

[Scott Drysdale]

IMHO -
The tapered flat paddle props are designed for the newer pancake style motors which have a larger radius relative to height.
The prop design was developed to create a higher percentage of lift closer to the hub without pushing air into the motor (restricts lift slightly).
These are also super thin such the the eCalc prop factor at the lower right can be manually reduced closer to 1.0 which implies more efficient lift with less torque required due to reduced drag.
Graupner is another company that has moved away from the conventional Clark Y airfoil that was originally intended specifically for aircraft wings not props.
But even the aircraft wing shape has since evolved to a thinner design so as to improve the L/D ratio.

In summary, the thinner props are supposed to give you more airtime..... but the Tiger Props use a curled up tip which apparently helps to achieve the same efficiency at least at slower rpms.
Clones of the Tiger Motors props likely do not include the internal cork filler that helps to reduce prop weight while dampening some of the prop noise.

 

[jbdww]

Sounds like there are lots of factors in how props are designed. This is great information. Wish there was a chart for all the prop, which would be a huge challenge, to see how they compare.

 

[gtranquilla]

eCalc for Multicopters has a limited database of props to choose from for direct performance comparisons between various propellers and the "PConst" factor that can be used for custom prop adjustment for the prop thickness...
The help section tells you how to use it. But at the end of the day it still seems to come down to "try and see". Some will claim the Tiger props are better for max airtime but there are so many variables.
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