[alberg30] Prop size for Atomic 4

[Robert Kirk]

From: Robert Kirk <kirk at neptune.gsfc.nasa.gov>

 Jim Davis wrote:

>13x7 two blade is the stock prop.  While a smaller prop will give you more 
>RPM's and more horsepower, you will loose the push from the larger
diameter.  
>Quite a few of us have tried different props to get the RPM's up, but it 
>seems most have returned to the 13x7.  I tried a couple combinations on Isa 
>Lei and for flat water the smaller size worked well.  However when I had to 
>power into any sea, the smaller diameter just lacked the push.  This isn't 
>scientific, just observations.


Jim... That doesn't sound right.  If you pour more power into the water it
should push the boat harder/faster.  Unless you generate more cavitation or
turbulence than thrust?  Of course, what I don't know about props is vast.
I too, have the 13 X 7 which chugs along nicely behind an Atomic 4.

Bob Kirk
Isobar #181

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