Sound when switching on external power

[ElZoido83]

Hey all. I found a video about the Starship on YouTube. I’m wondering what is the sound at 24:55 when the pilot switches on the external power…? It sounds like some linear motor or something. I couldn’t hear it yet in the Black Square Starship.

https://youtu.be/c6u6j1Fu4lI?si=zXpTLUnbhKbNun3L

Thanks!

[John S.]

interesting, it sounds like a type of hydraulic pump, probably engaging momentarily to build up system pressure

[DrZGard]

I thought it might be the flaps but those would get power as soon as the battery master was turned on. Also curious which breaker he pulls.

[plhought]

It's the anti-skid pump in the nose running to build up pressure. He has the switch set on all the time.

The breaker he pulls is for the Ground Idle Solenoids. CB is PROP GOV TEST. They are powered on the ground. Can get hot and melt their guts out.

Patrick

[DrZGard]

@plhought said in Sound when switching on external power:

It's the anti-skid pump in the nose running to build up pressure. He has the switch set on all the time.

The breaker he pulls is for the Ground Idle Solenoids. CB is PROP GOV TEST. They are powered on the ground. Can get hot and melt their guts out.

Patrick

I can verify this behavior is simulated. Just tried it out over my lunch break. Nick really did do his homework on this.

[plhought]

@DrZGard The pump yes.

The CB being pulled, correctly de-energizing the ground idle solenoids, unfortunately is not.

[jmarkows]

@plhought said in Sound when switching on external power:

The breaker he pulls is for the Ground Idle Solenoids. CB is PROP GOV TEST. They are powered on the ground. Can get hot and melt their guts out.

Patrick

Do you mind expanding on this a bit, what's happening that they necessitate being pulled and why?