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Static thrust

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BrianW

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Jul 2, 2018
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85
Location
Altus SW Oklahoma

BrianW

Well-Known Member
Joined
Jul 2, 2018
Messages
85
Location
Altus SW Oklahoma
N3puppy said in part:

Equation showing how varying a Props pitch will change both static and dynamic thrust numbers /snip/

Actually no, this equation does NOT show static thrust because at any pitch, an airscrew induces some rearward airflow, so the minimal V0 may well be 20 mph (29 fps, 8.9 m/s)
 

Steve C

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Oct 6, 2008
Messages
153
Location
Lodi, CA
I should start a thread that asks how much range a Sensenich has.

Without the op popping back in to clarify the question, it has no answer.
 

n3puppy

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Joined
Jun 25, 2019
Messages
172
Equation showing how varying a Props pitch will change both static and dynamic thrust numbers /snip/

Actually no, this equation does NOT show static thrust because at any pitch, an airscrew induces some rearward airflow, so the minimal V0 may well be 20 mph (29 fps, 8.9 m/s)
Reading the equation - RPM times Pitch sets the airscrew induced airflow number you are talking about
(your 20mph example)

By definition - Static thrust is measured with no forward motion.
V0 is the FORWARD air speed of the Prop (aircraft). In the equation it is a modifier to the Static RPMxPitch airflow.

Setting V0 to Zero for static thrust calculation means the only airflow considered for static thrust is that generated by the prop RPMxPitch - not outside forces like forward movement.

Forward airspeed (V0) is subtracted from the static RPMxPitch number in the dynamic thrust calculation.
 
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