Hey guys, a couple questions about 73 electrics: 1) If you look at the schematic, TR 3 has a diode located between it and its DC buses that are operated in parallel with the other TR’s. What’s the point of the diode there, and why do TR 1 & 2 not have one? 2) When operating under a single genera...Jump to post
Hello all, N1 and N2 are driven by separate shafts and are mechanically independent of each other, allowing them to have different rotational speeds because they are on different shafts. But why is N1 significantly slower (5,000 RPM) compared to the N2 RPM (15,000 RPM)? Does N2 need to rotate faster...Jump to post
If you’re looking for a really enjoyable L1011 video, check out the following link to my channel’s video. Taken in 1986 when my father was a flight engineer on the L1011.
Okay, so basically, just as high altitudes and low pressures are harmful for humans, the same can be said for pumps. At low pressures, cavitation will cause bubbles to form in the fluid at the pump inlet which can be harmful. So they put bleed air inside to pressurize so that cavitation won’t happen...Jump to post
Thanks guys, another follow-up question. I’ve heard the term “hydraulic head pressure” mentioned a lot while trying to get an answer to this question. What does that mean? Thanks againJump to post
Hello, Why is the hydraulic reservoir pressurized by bleed air? I’ve read it’s to reduce the probability of cavitation and fluid foaming at high altitudes and low pressures. But what is cavitation and why does it happen? Why would pressurization help with that? And what does foam have to do with it?...Jump to post
We always talk about how the bleed air we use is VERY high pressure, but it’s nothing compared to the 3,000 psi hydraulic systems. Would it be possible to have a pneumatic system that is pressurized to 3,000 like the hydraulics. I assume there wouldn’t be any benefits and there’s no way engines coul...Jump to post
I know that bleed air comes from two stages of the compressor. What I’m wondering is whether one is in the low pressure compressor and the other in the high pressure compressor, or if both are in the high pressure compressor but one is a lower stage than the other but still in the HPC. Thanks!
Hello - the following is something I’m going to post on Wikipedia but I want verification that my post is correct. Here it is: An air cycle machine, part of an aircraft’s air conditioning pack (pressurization and air conditioning kit) utilizes hot pressurized bleed air from the high pressure compres...Jump to post
https://www.youtube.com/watch?v=geWRUKCoyZ8&feature=youtu.be I found this video inside my closet and it was taken by my dad, who was an Eastern Airlines Flight Engineer, way back in 1986. I decided to post the L-1011 TriStar footage on Youtube in the hopes that it will bring nostalgia to some pe...Jump to post