[DAC21]

Static tests are normally horizontal, no? Sum ting Wong here.

[jmcenanly]

SpaceX does do test firings of a full rocket stack. However, the hold down clamps are sufficient to keep the rocket in place.

[jmcenanly]

SpaceX does do test firings of a full rocket stack. However, the hold down clamps are sufficient to keep the rocket in place.

[kosciusko51]

Solid rocket motors are tested horizontal. Boosters with liquid fuel and oxydizer need to be vertical to keep the liquid from the tanks flowing properly.

[NorthMountain]

Static tests are normally horizontal, no?

No, particularly with liquid rocket engines.

Here's a Falcon-9 static test fire: