What is the approximate thrust at sea level for a C-130J Hercules?
Okay guys, so I found some data from an old service publication from Lockheed. It says that the new C-130J propulsion system under standard conditions and flying 80 kts is rated &quot;4,637 SHP, but produces 10,200 lbs&quot;.
So using the equation for thrust available for a propeller aircraft I get:
$T_a = \frac{\eta \cdot P_s }{V}$
with:
$T_a = $Thrust available
$\eta =$propeller efficiency
$P_s =$shaft power
$V=$air speed
$\eta = \frac{T_a \cdot V}{P_s}$
$\eta = \frac{10200 \textrm{lbf} \cdot 80 \textrm{kts}[ \textrm{aka. }135 \textrm{ ft/s}]}{4637 \textrm{shp} [\cdot 550 \textrm{ conversion}]}$
$\eta = 0.54$
This seems quite low but its what I got for anyone wondering. The service publication I got the info from is this:
https://www.sikorskyaerospace.com/content/dam/lockheed-martin/aero/documents/sustainment/csc/service-news/sn-mag-v21-v30/V25N03.pdf