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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Thrust Stand and Propeller Modification.
Purpose and Goals:
First, to evaluate categorically the propellers being used for multirotor use, using tables. Second, to confirm or invalidate power reduction by cutting propeller tips back, (high mass low velocity change props). Third, make much better estimates on duration of flights for a given battery mass.
*NOTE: there is one premise above all others i want to prove or disprove. that as blades get wider, steeper in pitch but shorter in radius they produce thrust at lower overall velocity change in the slipstream (given constant power input and RPM).
the overview of the test stand.
I have two of these, one will be used so i dont need my fingers near the prop, the other will be modified to output with a BNC connector to a O-scope.
It appears to be just a generic 8051 microprocessor.
if you look , youll see a LM358 IC near the PD. i wonder if i should take the output from there?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Dr. Spark wrote ...
I like the pressure transducer. So is this to test motor vs prop vs current something like this Rgs, Dr. Spark
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Occupation: Retired Lifestyle: Biker "Old cowboys never die. They do, on occasion, have to reload "
yep, then i can post real in depth data. volts, amps, watts, RPM in increments, prop pitch, prop dia, force, throttle increments, velocity of flow.
EDIT: im also trying to figure out derivatives for each prop maker, each prop, and in the categories of: derivative of radius as dV/dR (velcoity/radius) derivative of mass as dR/dM (radius/mass) derivative of thrust as ??? power in? maybe?
but i need to look at my calculus book and sober up some...
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Thrust Stand and Propeller Modification.
