Hi!
I'm your local demoman and I have something to teach you. It is going to be complicated, it is going to be useless so

just ƒucking shoot and don't think

Anyway, if you are as mentally defficient as I am, continue.

So, as you might know, pipes are projectiles and your mother is a ωhore. And the pipes are ωhores as well, y'know.

Now let us start with equations of motion:
x = Vx * t
y = h + vy * t - g * t² / 2
There are three vectors that form a right triangle, those are V0, Vx and Vy

the horizontal velocity component vx is equal to V0 * cos(α)
the vertical velocity component Vy = V0 * sin(α)

Then we combine the equations of motion and velocity components into one formila:
x = Vx * t => t = x / Vx
y = h + Vy * t - g * t² / 2 = h + x * Vy / Vx - g * (x / Vx)² / 2
y = h + x * (V₀ * sin(α)) / (V₀ * cos(α)) - g * (x / V₀ * cos(α))² / 2

As we know, sine over cosine is the definition of a tangent, so the formula is expressed as:¨
y = h + x * tan(α) - g * x² / 2 * V₀² * cos²(α)

None. You are never going to use this. Nor are you going to remember it. Just stop playing Team Fortress 2 and go get yourself some ♭itches on your team.

The grenade launcher fires pipes at cca 1065 Hu/s, or Hammer units per second. All of the following trajectories will be calculated at a starting angle of 15 degrees, as that is the norm more or less. The player model is 83 Hu tall when standing and the demoman shoots from about 55 Hu. Which is still probably taller than you.
In the end, the trajectory should look something like this:

The iron bomber is not really even a sidegrade too much and it shoots at 1065 Hu/s as well, so the graph looks the same

Now the Loch-n-load shoots it's projectiles at the velocity of 1522 Hu/s, which is about the speed at which I shoot ℂum into your mum. As such it has a straighter and longer trajectory.

Now surprise surprise, you were adopted the Loose cannon shoots at 1065 Hu/s as well. As such the trajectory is the one of the grenade launcher, but the projectiles explode 2 seconds sooner by default. If you charge it up, that time goes even lower. The graph still looks like your face, so weirdly deformed and really ƒucking long

Maybe you are a bit smarter. Maybe you are still really dumb, I dunno. But I just wasted a few minutes of your life and I am really, genuinely happy about that.
Go do something better, my final message
Goodbye