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The F-35, meanwhile, uses an exposed circular nozzle, which lacks shielding. The F-35 does incorporate advanced heat sinks and ducts, which reduce the IR signature—but not to the F-22’s levels.

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Parts of the upper-stage engine nozzle had fallen off after stage separation, “substantially reducing the engine’s thrust,” Firefly said.

The Federal Aviation Administration is grounding Firefly Aerospace's Alpha rocket until the company completes an investigation into the vehicle's April 29 launch failure.

Shortly after liftoff, a mishap during the separation of the rocket’s first stage damaged an engine nozzle, severely reducing the rocket’s thrust, according to a statement by Firefly.

About two minutes following liftoff from the Vandenberg Space Force Base in California, the engine nozzle on Alpha's upper portion broke off in space moments after it attempted to separate from ...

Following a nominal liftoff of Firefly’s Alpha rocket, there was a mishap during first stage separation for the FLTA006 mission that impacted the Stage 2 Lightning engine nozzle.

“The rocket then experienced a mishap between stage separation and second stage ignition that led to the loss of the Lightning engine nozzle extension, substantially reducing the engine’s thrust,” the ...

The second-stage engine’s nozzle, noticeable for its red-hot appearance, couldn’t be seen on video prompting suspicions. Firefly later confirmed spectators’ suspicions of a mishap.