F-15C Eagle Questions

[Frostie]

theres a reason you start your right engine first - anybody know it?

: )

 

GG already knows it! so.. zip it!! lol

 

Right hydraulic pump pressure check, left and right pumps have different pressures, left one being the highest. Once the left engine is started the hydraulic pressure will read the higher value ie. the left pump.

[GGTharos]

They actually have the same pressure (pumps are the same). The check valve reduces the pressure to prevent harmonic amplification that could destroy the hydraulic system (note: my interpretation).

 

This one you have one check valve, one gauge for the two utility hydraulic systems.

 

Also, IIRC the ladder for climbing into the cockpit is on the left side (well, it was last time I climbed up on it) and so starting the right engine first lets the ground crew do whatever they need to do on that ladder while the right engine is spooling.

[mvsgas]

theres a reason you start your right engine first - anybody know it?

: )

 

GG already knows it! so.. zip it!! lol

 

I don't know the actual reason. I know that PC2 (hydraulic power for flight controls) pump and the right Utility pump are on the right AMAD. I know after start Engine 2 (right engine), you climb the ladder, the pilot will raise the canopy and you can take the safety bar (don't know the name) You get down and secured the ladder...

 

...and if you are like me and you don't know what your doing, you get your mechanic glove stuck on the ladder, struggle with it, and you try to signal the pilot to wait a second but you give him the signal to start engine one, so he starts motoring the engine, you realize what is going on and freak out, finally free you hand run away from the aircraft, get a save distance from the engine intake and look around hoping nobody notice...but someone always sees and they are ROTFLOL.

(EAA Airventure, 1998 )

[SinusoidDelta]

I don't know the actual reason. I know that PC2 (hydraulic power for flight controls) pump and the right Utility pump are on the right AMAD. I know after start Engine 2 (right engine), you climb the ladder, the pilot will raise the canopy and you can take the safety bar (don't know the name) You get down and secured the ladder...

 

...and if you are like me and you don't know what your doing, you get your mechanic glove stuck on the ladder, struggle with it, and you try to signal the pilot to wait a second but you give him the signal to start engine one, so he starts motoring the engine, you realize what is going on and freak out, finally free you hand run away from the aircraft, get a save distance from the engine intake and look around hoping nobody notice...but someone always sees and they are ROTFLOL.

(EAA Airventure, 1998 )

 

:megalol:

[draconus]

FlankerMan:I discovered the reason for all my takeoff troubles! I had tried to start both engines at about the same time, so only one started! That would also explain me swerving issues, since only one side was going. YESSS!!!

draconus:Just... Wow! Now, I have to try that for myself ;)

Well I did some testing with one engine take offs and it's entirely possible. First one with empty plane (just half the fuel and no weapons): easy, beacause there's more than enough thrust, but due to lower inertia much more unstable. Second try with super-heavy (three bags, full fuel tanks, all weapons): crash - just couldn't lift it, but easier to center on the runway due to weight. On the second try I barely managed and fly away on the borderline of stalling, with just like ~1ft/s climb. So you can do it, but it's hardcore. Landing that heavy with one engine running is even so much harder - suicide mission.

At first I thought the lenght of the runway will be main problem but it was not (at Sukhumi). Lifting heavy plane was - not enough thrust.

Edited February 1, 2018 by draconus