SV: data collection and storage.

[espen hilde]

Reading, testing props is a real black art.
I do know that some of the guys paint them up with stuff and then read how
the "paint" gets washed off.  All done in private testing.
Cavitating props will even erode them, quickly.
If you serious about all this, I'd hit the biggest library possible, and 
get
anything about props there is (both air and water).
Bruce

Read a tip using lipstick on the blades to read the turbulence,its maybe 
like reading spark plugs, dont forget the essencials in the gizmo world.
Mercury is using high speed cameras under water to check their designs for 
problems.Flowing fluids and gasses is difficult to observe maybe thats why 
its so magic/black art..
A famus propeller guy told me its more difficult to make the right 
propeller in this class (250ccm) than F1.its extreamly sensitive to aria
Some racers
protect their propellers like its the hottest industrial seacret,some 
things to learn from that ,not the way I am used to do things....Eating 
with it never out of sight..
Not the biggest demand for surface piercing propellers in the world,not 
much to read about I am afraid,but I get your point. I maybe have to take 
in to account the way we where crashing the model air plains all the time 
before we learned about ving tip stal and wash out in the wings.......
thanks
Espen


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