Update Air Prop Thumbnail

_posts/2021-04-01-air-propulsion-simulation/air-propulsion-simulation.Rmd

@@ -112,7 +112,7 @@ end
 
 Below in figure 1, the result of the simulation is plotted. Notice the massive error once the tank starts running low. This is because the calculation for pressure has a lot of very uncertain variables. This is primarily due to air being a compressible fluid, making this simulation challenging to do accurately. The thrust being below 0 N might not make intuitive sense, but it's technically possible for the pressure to compress, leaving the inside of the rocket nozzle with a pressure that's actually below atmospheric pressure. The effect would likely last a fraction of a second, but the point stands that this simulation is wildly inaccurate and only meant to get an idea of what an air propulsion system is capable of. 
 
-```{julia, code_folding=TRUE, results='show',layout="l-body-outset", fig.cap = "Air Proplsion Simulation", preview=TRUE}
+```{julia, code_folding=TRUE, results='show',layout="l-body-outset", fig.cap = "Air Proplsion Simulation", preview=FALSE}
 
 thrust_values = df.Thrust .|> ustrip .|> value;
 thrust_uncertainties = df.Thrust .|> ustrip .|> uncertainty;