this post was submitted on 21 Jul 2024
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[–] [email protected] 80 points 5 months ago* (last edited 5 months ago) (5 children)

Their rocket exhaust as they're being fired would slow the planes down, rather than providing a boost

For the same reason, cars have exhaust on the rear so that they can go much faster forward than backward

Edit: /s since you apparently need it after every joke. I know that missiles aren't really fired, they detach and then propel themselves. Also, anyone who's ever idled their car on a flat surface knows that the exhaust thrust cannot even overcome rolling resistance.

[–] modeler 39 points 5 months ago

Ackshually they do this, not with cars but, with WW2 era prop planes.

The Spitfire for example:

The Merlin consumed an enormous volume of air at full power (equivalent to the volume of a single-decker bus per minute), and with the exhaust gases exiting at 1,300 mph (2,100 km/h) it was realised that useful thrust could be gained simply by angling the gases backwards instead of venting sideways.

During tests, 70 pounds-force (310 N; 32 kgf) thrust at 300 mph (480 km/h), or roughly 70 hp (52 kW) was obtained, which increased the level maximum speed of the Spitfire by 10 mph (16 km/h) to 360 mph (580 km/h). The first versions of the ejector exhausts featured round outlets, while subsequent versions of the system used "fishtail" style outlets, which marginally increased thrust and reduced exhaust glare for night flying.

From Wikipedia

[–] TwentySeven 0 points 5 months ago (5 children)

The exhaust doesn't propel a car forward

[–] [email protected] 48 points 5 months ago (4 children)

I'm going to start a meme crackpot theory.

Torque doesn't exist.
Cars move because of the exhaust gasses.

"What about trucks with an exhaust that points up?" I hear you ask, well why are they always bent over at the top to point backwards?

Tractors that have an exhaust on the top use it to keep the tractor on the ground, otherwise the forces of dragging things would cause the tractor to float off the ground. But the exhaust is pointed backwards slightly, other wise it wouldn't move. The small backwards pointing force explains why tractors are so slow.

Electric cars are CGI, and part of the conspiracy to hide the fact that torque doesn't exist.

[–] [email protected] 17 points 5 months ago (1 children)

My god, you're onto something here. That must also be why we evolved with backward facing asses, to ease our walks when we fart. Ventilated seats in your car? They help channel your farts to add nitro boost to your car's exhaust.

[–] UndulyUnruly 17 points 5 months ago (1 children)

Fucking hell, the air vents in the dashboard are all blowing backwards against the direction of travel, too. We been living a lie.

[–] [email protected] 6 points 5 months ago

And the radiator at the front? Actually for extra speed.

That's all a turbo is. It's just a fan in the exhaust pipe adding more speed.

And superchargers need a big air scoop due to the amount of air it pushes out the back.

[–] [email protected] 11 points 5 months ago

This is even better than birds aren't real. Which is true also.

[–] [email protected] 10 points 5 months ago (1 children)

Electric cars are CGI, and part of the conspiracy to hide the fact that torque doesn’t exist

Ah so the cyber truck just never got an up close model made

[–] [email protected] 8 points 5 months ago

Yeah for some reason they locked the model detail at some hilariously long draw distance so it only has like 15 polys

[–] mojofrododojo 3 points 5 months ago

I think you've created the sovereign motors movement.

[–] riodoro1 34 points 5 months ago (1 children)

Oh yeah dummy? Go plug up your exhaust and see if you drive anywhere.

[–] [email protected] 34 points 5 months ago* (last edited 5 months ago) (1 children)

I forgot you need "/s" after every joke, even in joke communities. It is a reference to this greentext:

anon drives a car

Let's give anon the benefit of the doubt. Perhaps they're an alien engineer from a planet that only knows rockets, disguised as a teenager to learn about our modes of transportation.

Yes, there is a short film with just about this plot

[–] [email protected] 4 points 5 months ago

OK. I didn't know that one.

[–] [email protected] 5 points 5 months ago* (last edited 5 months ago)

Let's agree on that the effect is of negligible magnitude.

[–] Blue_Morpho 3 points 5 months ago

Haven't you seen Batman?

[–] OutsizedWalrus 0 points 5 months ago

lol what?

Rockets aren’t attached to the plane when they launch. They release then fire there rockets. It might be near instantaneous but missile thrust has no bearing on an airplane.

[–] [email protected] -4 points 5 months ago* (last edited 5 months ago)

The rockets would need to accelerate in the opposite direction of their initial motion, thus a lot more energy would be needed to reach design velocity. That makes it necessary to carry a lot more fuel for the propellant and thus, the rocket can carry less explosives. For some moment the rocket would also have zero velocity.

On the analogy with the car: The exhaust gases do not carry enough momentum to actually have a nonneglibile effect.