Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with apu
Search options answers only
not deleted
user 22864
Auxiliary Power Unit. A device for providing alternate power to an aircraft, usually located in the aircraft's tail.
1
vote
When and for what purpose APU is used on the ground?
So the APU is a small engine that the batteries can start. The APU can then start the main engines.
But it also provides hotel power... … Simpler versions of this shore electric and air supply is a portable cart that is basically an APU on wheels. …
2
votes
What powers the air-conditioning on commercial planes?
It's not a normal A/C unit
Aircraft do not use a Freon based compressor vapor-liquid transition heat pump type arrangement the way every home, car, boat and train does.
They use a simpler cycle, becau …
21
votes
What is the loud noise of a helicopter when the rotors are not yet moving?
You may be expecting the rotor to spin up in lock-sync with the engine.
That's not quite what happens on a turbine helicopter.
Turbine helicopter engines (turboshaft engines) have a turbojet en …