FlyBeQ400 From United Kingdom, joined Jan 2005, 221 posts, RR: 0 Reply 2, posted (7 years 11 months 17 hours ago) and read 41581 times:
That is the method for shuttling extra (spare) engines for planes which need a replacement for maintenance reasons in a location without spares on site, as far as I know.
EGTESkyGod From United Kingdom, joined Jun 2005, 1686 posts, RR: 14 Reply 5, posted (7 years 11 months 17 hours ago) and read 41570 times:
They were at one point testing the A380 using a 747, as its the closest thing around to the A380. Also sometimes they whack a 5th engine on the wing to ferry it around.
CV747 From Iceland, joined Jan 2000, 170 posts, RR: 1 Reply 6, posted (7 years 11 months 17 hours ago) and read 41568 times:
It's a poded spare engine.
Boeing and Douglas have offered this option to transport spare engines for long time. I have pictures of 707, DC-8 and 747 with a poded spare engine.
UpperDeck79 From Finland, joined Feb 2005, 1139 posts, RR: 2 Reply 12, posted (7 years 11 months 16 hours ago) and read 41295 times:
Pardon my ignorance, but why couldn't you just put the 5th engine in the cargo hold...? Doesn't it produce a lot of extra drag while hanging from the wing?
RichardPrice From , joined Dec 1969, posts, RR: Reply 14, posted (7 years 11 months 16 hours ago) and read 41260 times:
Quoting UpperDeck79 (Reply 12): Pardon my ignorance, but why couldn't you just put the 5th engine in the cargo hold...? Doesn't it produce a lot of extra drag while hanging from the wing?
THe engine is essentially a straight through thing, the air jsut goes straight through it so the drag isnt as high as you might think.
Putting it into the cargo bay means you loose that cargo space for paying customers.
Jeb94 From United States of America, joined Oct 2004, 588 posts, RR: 5 Reply 15, posted (7 years 11 months 15 hours ago) and read 41239 times:
That and the passenger carrying 747 doesn't have a door big enough to fit an engine of that size into it. They do suffer a drag penalty (the core and fan do create drag) but its cheaper than chartering a cargo aircraft that has a large enough door to fit the engine in.
HT From Germany, joined May 2005, 6473 posts, RR: 27 Reply 16, posted (7 years 11 months 15 hours ago) and read 41213 times:
Quoting UpperDeck79 (Reply 12): Pardon my ignorance, but why couldn't you just put the 5th engine in the cargo hold...? Doesn't it produce a lot of extra drag while hanging from the wing?
Sure it does produce a lot of drag, but this procedure was established a long time ago taking the following points into consideration:
Usually the spare engine needed a some airport was attached to an a/c flying this route anyhow (i.e. carrying pax or similar) - so it was not sent onto an almost empty ferrying flight.
By the time the big engines for the likes of B747 / DC10 / L-1011 were introduced, reliability of these engines was considerably lower than nowadays. So it was much more likely that an a/c got stranded at some remote spot (w/o proper m/x) and that a spare engine had to be flown in.
Back then, dedicated cargo-a/c usually were not able to accomodate a spare engine for a B747 w/o some kind of dismanteling due to size restrictions. Therefore it was easier (and faster & cheaper) to put that engine to be transported under the wing.
Today, this procedure is used much less. Engines have become much more reliable; engine shops have been set up at more airports - and not every airline stops flying its B744 once one engines quits in flight, but continues its transatlantic crossing to LHR
-HT
Carpe diem ! Life is too short to waste your time ! Keep in mind, that today is the first day of the rest of your life !
NZ1 From New Zealand, joined May 2004, 2188 posts, RR: 27 Reply 20, posted (7 years 11 months 15 hours ago) and read 41154 times:
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Quoting 777ER (Reply 10): Correct me if I'm wrong, but the pod is only on classic B747s, no B744s have it
Fifth pod is available on all 747 series, but only RR engines can be fifth podded, as far as I know.
Quoting UpperDeck79 (Reply 12): Pardon my ignorance, but why couldn't you just put the 5th engine in the cargo hold...? Doesn't it produce a lot of extra drag while hanging from the wing?
AKelley728 From United States of America, joined Dec 1999, 2101 posts, RR: 6 Reply 24, posted (7 years 11 months 12 hours ago) and read 40319 times:
Quoting Atco2b (Reply 19): Can they be used on flights with pax?
Yes
25 Lhrstu: Does anyone konow if the A380 will have the same capability?
26 WhiteHatter: I wouldn't think so, fifth podding is a practice which was developed in the 1960s and 70s when there was not as much civilian heavy lift capability a
27 AR1300: Why??Could be only windmilling.Sure the fans will spin with all that air going thru them.... Mike
28 EBJ1248650: This one was running, though. Exhaust and heat and everything. I suspect that the heat you saw was exhaust from the nearest running engine or set of e
29 CitationJet: The 5 engine 747, not to be confused with the 3 engine 747.
30 Speedbirdegjj: UAL747 was referring to Reply 10 questioning whether this applied to -400's or only classics!!.
31 F14D4ever: Take a close look at the SA and Qantas engine ferry pix; they both have a toric insert to block flow into the core. Now look at the Aer Lingus ferry;
32 Drinkstrolley: What about the 747 where the nose lifts up to give access?
33 Joshdean: Well that's a freighter, but the discussion here is about fixing it to the wing so you don't have to pay a load of money to put it in a freighter...
34 Jeb94: I never noticed the inserts before. That's cool! Keeps the air from flowing through and prevents windmilling. Windmilling an engine isn't the best thi
36 N766UA: Yeah that 5th engine definately wasn't running. You probably just saw it windmilling and noticed exhaust from the #2 engine.
37 AirxLiban: On 744s can the CF6 and PW4000 engines be podded as well as the RB211s?
38 Blue787: Regretably an engine(PW4000,GECF6 or RB211) would not fit in the lower cargo hold as in a 744. unless it was a 74F in which case it will travel main
39 KAL_LM: Drinktrolley wrote: "What about the 747 where the nose lifts up to give access?" Even though we're not talking about freighters, just as an aside, th
40 VH-MDK: From a QF Lame: "A Boeing 747 can have a 5th pod attatched if there are fittings on the wing. The only Engines that can be 5th podded are RB-211 all v
41 LPLAspotter: I flew a TP L1011-500 which was ferrying an engine as Aak777 pointed out. The flying time to BOS from TER was the typical 5 hours or so, so I don't th
42 HAWK21M: How much drag would the Ferried Engine cause. regds MEL
44 JumpJet: I once saw a Saudi Arabian L1011 Tristar land at LHR with an extra engine slung by the port wing root. It looked really odd from directly in front as
45 Airforum: hmmm AFAIK they usually fly at lower speed when carrying an extra engine (compared to a regular flight)
46 Lucifer: You probably saw additional heat exhaust from the air conditioning packs, which are in the belly of the aircraft.
48 UpperDeck79: Looks like a missile or something!
49 Aak777: I bet it can carry a dosen of them in the cargo bays. No offince airbus lovers. I love airbusses too.
50 C172: No offence Airbus lovers. I love Airbuses too. Just trying to bring this thread back to life.
51 Ncfc99: Can a B747 carry an engine on both sides at once or does it have only one fixing point. I notice all the pictures have the extra engine on the same si
52 ZK-NBT: The 747 can only carry an extra engine on the Port side!
53 NZ1: As far as I am aware, no you cannot 5th pod a CF6. We have always freighted them if the need has arisen. NZ1
55 JpetekYXMD80: WHY? Mission accomplished, questions answered. Threads die for a reason you know...
56 AeroWeanie: This was possible (back in 2001) - GE's test bed, N747GE, was tested for a short while with a CF34-9 hung on a L shaped pylon mounted inboard of the
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Ideal way unless you have a B747F.
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