Doxford type engine
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- Опубликовано: 24 авг 2024
- Video of the twin Diesel Doxford type engines on board the cruise ship Princess Danae.
The ship was built in 1955 by Harland and Wolff as Port Melbourne.
PS: Some additional information
This particular engine has ONE combustion space with a cylinder on the bottom connected directly to the crankshaft and one on top connected to the crankshaft through long rods. Double acting engines have two combustion spaces, one on the "conventional" position and another that is below the piston, much like in a steam engine.
Doxford type: www.oldengine.o...
Double acting type: www.oldengine.o...
I served my apprenticeship at Doxfords and never looked back . The apprentiship i served held me in good stead im still working at 75 the memories i have lived it all so much and will always be proud to be a Doxford Marine Engineer
Me to Joe I remember you I think you were good at footie as well. I still have my apprentice patch that we had on our green overalls. I have been to quite a ot of places and now live on tge Gold Coast Australia. I have great memories oh my name is Mike Foster I am 80 an still the same kid at heart. I left before the company went under. I resigned from my job as training office cos I was fed up telling management that we were not going to survive because the senior management didn't innovate and just sat in there cosy offices and waited for Companies to come to us. The seahorse was a prime example of dreaming.
It doesn't matter it is a beautiful engine, sadly not seen any longer. Sounds like a sowing machine and brings back many memories, although I was a Doxford man.
Loved this type of B&W engine, sailed on the Rockhampton Star with a single engine opposed piston engine identical to these ones. Also sailed on ships with Doxford engines, my first trip as an engineer cadet was on the Brasilia Star that had two five cylinder Doxford engines.
Bob Spence is absolutely correct. This is definitely not a Doxford engine. Burmiester and Wain built an opposed piston design engine and Doxfords of Sunderland successfully won a case against them for patent infringement. The opposed piston design is the only thing the two manufacturers had in common. Doxford never used four side rods on any transverse beam from the first engine in 1921 to the last in 1979.
Furthermore, the Daphne was built at Swan Hunters yard on Tyneside in 1955 as Port Sydney and not at Harland and Wolff. Launched 29 October 1954. Renamed Akotiri Express. Converted to passenger ship Daphne at Chalkis shipyard. Fitted with two Doxford 67LB6 engines by Wallsend Slipway, contract no 1048.
Port Melbourne was built at Harland and Wolff, with Burmiester and Wain engines. Renamed Therisos. Converted to passenger ship Danae.
A very good video is spoiled by entirely misleading information.
Accuracy must be a pre requisite, NOT an optional extra.
GREAT VIDEO I USED TO BE A JUNIOR ENGINEER WITH HOULDER BROS OF LONDON MY FIRST SHIP WAS MV SHAFTESBURY A DOXFORD HAVE LOVED THEM EVER SINCE
.This is a B&W opposed piston engine. I served my apprenticeship helping to build these and others on the Clyde
Seen a lot of engines but this is the first time for this .
Reminds me of my time on the Adelaide Star & Ulster Star in '68 & '69. Nice video.
I never claimed it to be a Doxford engine, but a Doxford type engine in the sense that the top pistons of an opposed piston engine are not connected to a second crankshaft but to the main crankshaft through long rods. Main exterior differences between this engine and a "true" Doxford are the presence of 4 rods per cylinder instead of two and the absence of the guiding rails for the top cylinder.
Regards
Gonçalo
Yes, a B&W or as we on the Tyne called them, Flying Bedsteads.
Crossed the pond a few times with H&W engines during the 70s. They are opposed piston on a single cranshaft, If I recall correctly the top piston is the exhaust piston. As it rises it exposes exhaust ports, the lower piston exposes the inlet ports, uses a Roots mechanical Blower to boost inlet pressure. I am sure they are 2 stroke with heated heavy oil fuel injection. Great times in those days travelling the east coast of S. America and an education!!!
Splendid diesel for a fine ship: the Danae
This engine is also double acting, ie each piston pushes and pulls with combustion space each side of each piston!
Theres a website with the cross section.
IMO No.: 5282483 Originally built as PORT MELBOURNE at Harland & Wolff - Belfast (Yard No.: 1483) Engines 2 x 6 Cyl. Harland & Wolff - Burmeister & Wain.
B and W Exhaust Piston. Not Oposed Piston. The main purpose of the upper piston was to open and close the exhaust ports
Finally!!! Someone with the correct wording! It is an exhaust piston. It was controlled by an excentric on both sides of the main crank. Also note the relatively short stroke of the exhaust piston. This type was built in single acting version and also in double acting version. This one is the single acting version as installed in 1955 when she was Port Line's "Port Melbourne"
I served on Blue Star Port Lines, most of their motor ship had the same H&W direct drive diesels, nice , but a lot of work to change a piston, looks very impressive when running full ahead !!!
This is not a DOXFORD Engine, but most pobably a Harland & Wolf double acting "B&W" Engine
Regards
Alfons
Single acting Harland and Wolff , l knew CC Pounder personally
Dit was Port Line's "Port Melbourne" uit 1955 en was de single acting uitvoering met dus alleen een uitlaatschuif boven. De DW uitvoering staat als vast bekend beschreven in van Tijen en Kapsenberg uit 1956.
FIAT has also build 2 or 3 of this engine one is instald in an litle cruiseship ex Hurtigruten called Harald Jharl this ship was build in Norway in 1958 and was taking out of servise in 1997,this is an wery nice engine and its run at 150rpm and its has 3500 horsepower
Does anyone else here feel like they want to hop on top of that thing and go for a ride?
Not Doxford - Certainly a Harland & Wolff B&W - I sailed on 2 vessels, as Engineer, the mv Arawa and mv Aranda with Shaw Saville Line 1969-1970
Amazingly quiet.
@bayoulimey
actually I stand corrected, the H&W engine has 2 big pistons and 1 or 2 smaller pistons controlling exhaust ports that R just bigger than piston rods.
The big problem was, as i remember it, the sealings (pistonrings) around the pistonrod. If you could hear teh "whisling" it was almost too late to rescue the pistonrod.
The B&W was also double acting with the Piston Rod passing through the lower exhaust piston - an "interesting" sealing challenge
The top piston stroke is 14 3/16" and the bottom piston stroke is 32 1/4". The cylinder diameter is 20 7/8".
nice one, i worked on the MV, Brittish TRust, one of the 16,000 ton bird class, 1974, she had an oppossed piston doxfors simmilar to this one,
cool video.
thom.
That's got to be awfully scary to be around in high seas when the ship rolls on the waves, I wouldn't want to trip on that upper engine catwalk!
Ha Ha they were brilliant engines, heavy work maintaining them and serious scavenge fires when pushed too hard
This is not a Doxford Engine it is a B&W engine
@bayoulimey
I have seen harland and wolf , and B&W double acting engines, they used 2 pistons per cylinder just the piston rod sealed the combustion spaces on underside of pistons.
Under piston scavenging is rare I think; the sulzers i have seen used turbo and smaller scavenging pistons in paralel to main cylinders.
I menat on the H&W DOUBLE acting engines, they had combustion space above and below main piston with exhaust pistons either end of cylinder with a cross head going through (3 pistons per cylinder); I know how single acting op engines work; Ive helped out with deltic repairs and my grandfather worked on doxfords and talked for hours about them; U can google the H&W OP double acting thing, its an unusual lump.
@tpvalley Who knows the battle between Doxford and Harland & Wollf concerning patent problems?
Alfons
@bayoulimey
correction one combustion space between pistons.
Two many side rods for me, love the telescopics for the top piston cooling, it took Doxfords a while to get there. P types were the first I think?
Yes, that's the free piston type, no Connection rod. The Deltic is lovely by the way.It sounds like a Wolvrine is running.
L.S
I noticed that the name of this video "DOXFORD TYPE ENGINE ,gave a lot of confussion instead of HARLAND & WOLFF B&W Opposed Piston Engine
Alfons
It's a Doxford Type in having opposed pistons even if the top moving part is not an actual piston it functions as one.
I am workiong on a case study for Doxford type engines can anyone tell me how to obtain a service manual for Doxford "P" type engines. TIA
not quite, a crosshead runs to main piston, rod on other end of C head to crank, this passes through bottom Ex pistons centre, top ex piston has crosshead like doxford to crank at bottom, have a look on the site there r a few wierd designs to fathom out!
Harland & Wolf not Doxfords
@jeremymeadows100 "the exhaust piston is driven by eccentrics on the crankshaft" Do you k now why they went that route?
Stiffer stronger more easily manufactured crankshaft, than the Doxford
@@keithralfs5190 Exactly!
I suppose this is a one stroke engine!
it fires every stroke up and down!
I'm wandering what are the dimensions of this engine, namely the height. Is this engine propelling a ship?
gr, Tom
Hard t imagine this engine type ever got beyond first rough sketch?
opposed piston engines are very efficient, have fewer moving parts, and are very reliable. Fairbanks Morse made thousands of them that ended up in the victory ships that brought supplies from the US to Eurpoe durring the second world war.
@bayoulimey
so how does it scavenge on start up when turbo/s are not turning?
I have seen some large 2 strokes with superchargers or turbo's and extra scavenge pistons, is that the case here?
Some vessels had a large electric driven standby fan for starting and maneouvering
Rootes style blowers driven from the crankshaft and electric blowers at first start up
@bayoulimey
if it has 2 combustion spaces it must be double acting, if single acting OP engine it has one combustion space between cylinders, if double acting it fires on both sides of one or both pistons- how can u have 3 pistons in one cylinder?????
The lower exhaust piston is a cylinder with piston rings inside and outside fitted around the piston rod. This is possible because its a crosshead engine. I hope this clarifies things.
Oh Dear, oh Dear!
Is it supposed to be doing that our did they not put in head bolts? It kind looks like a carnival ride.
i wonder if anybody ever tried to ride those at low rpm ? (probably 🤣)
look at oldengine(dot)org and write old hot bulb and marine engines after it on google, see harland and wolf.
0:24 Manila gasket :D
Looks like same of buurmaister & wain
I'm trying to get this all straight .
The Danae has Burneister & Wain designed engines built by Harlan & Wolff
The Daphne has Doxford built engines ?
At least some other video's show the lower levels of the Daphne engine room with Doxford emblems on the machinery ?
Am I correct with this ?
At any rate they both are very neat ships and the vedeo's are great !
What! Where on Earth have you learned this. Combustion Chambers UNDER the piston with open to the air top and bottom? You really need to study quite a bit more on OP engines! On old single piston 2.stroke(Fairbanks Morse 1930) the underside of the piston compressed thr air sucked into the crankcase via checkvalves and pressed it to the intakeport and thereby also helped scavenging!
It's a Big & Wonderful 🤣
God saved me from that treasure
The two pistons are the same.... Theese engines have the only problem thas is the mass who have a alternative movment are very heavy and it needs to runs absolutly slowly because vibrations..... the rest is perfect!!!...by
These engines are turning at about 58 RPM. I worked on the H&W 6 cylinder versions in a power station and they turned at 375 RPM to produce 5MWe, 415V at 50Hz. The sump capacity was 2000 gallon Shell Talpa oil that had to be centrifuged every 100 hours as it was non detergent oil. The engines were in service from mid 50's to early 80's.