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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I guess the way to simulate what we want is to use something like those spring things that fishermen use to weigh fish to apply a force upwards to the blade tip, at least as far as static measurements go.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ash, im wanting to commit to a airfoil cross section from root to tip. Typically the pitch is defined by measurement at 75% radius. But Im thinking we might change the pitch/AOA from a normal prop to our prop, from the root to tip more aggressively.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
think so, yes, pretty much. Same as a Bell, as a 'starting point', at least.
Once we know how much CF we need to use, we know the chord length (or we can calculate it), then we just need to work out the angle of attack for each 'section', to obtain hover ar 4000 RPM, or whatever the figure decided was for the bottom end of the drag bucket.
Once we know how much CF we need we can try inputting some meaningful data into XFOIL.
EDIT: I'll try and look up the 'forces in a beam' thing this weekend, I need to refresh my memory, but I do remember it's pretty simple stuff.
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Propeller Physics and VABs Program.
