DH Mosquito cockpit diagrams
Thread Starter
DH Mosquito cockpit diagrams
I am trying to help a friend to understand the carburettor heat controls on the DH Mosquito Mk FB40, an Australian built version designated A52-24, which I believe may have been fitted with Packard built Merlin engines. Does anyone have a picture or annotated cockpit diagram of the engine controls and carb heat controls which has a clear depiction of these controls? I would be very grateful for any help from knowledgeable PPRuNers. Many thanks in advance.
I haven't tried registering, but according to the website a free account will get you access to a few sets of Pilot's Notes here: https://www.avialogs.com/aircraft-d/...-dh-98mosquito There is a US version included which might give you the different viewpoint you're looking for.
"Mildly" Eccentric Stardriver
Try the DH Museum in UK. https://www.dehavillandmuseum.co.uk/ A small museum, but with excellent staff and THREE Mossies, including the prototype
As far as a quick check of Wikipedia can show me... the Australian built Mossies used the Merlin 31 which appears to have been a Rolls-Royce built version. Packard did build a Merlin 28 based version as the V-1650-1 but that was not a Mosquito engine, or does not appear to have been one. Other sections of the relevant pages do mention a Packard-built Merlin 31 variant though. The upshot of this is that the Aussie Mossie most likely had carb heat controls (and other engine controls) that matched other Mosquito versions but I cannot be 100% sure. Can somebody check the relevant Putnam book? 😉
Thread Starter
Thanks Jelle. The only reference I found was on page 14 where it mentions carburettor heat, if fitted. I would have thought carb heat was a rather important feature, so why, if fitted?
https://www.avialogs.com/aircraft-d/...uito-fbvi-fb26
https://www.avialogs.com/aircraft-d/...uito-fbvi-fb26
Putnam says the first 100 had Packard-Merlin 31s and the remaining 112 had Merlin 33s, but doesn't state whether R-R or Packard. Personally I would think Packard are more likely than shipping R-R engines 12,000 miles or so,
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I have only encountered a carb heat control on piston engines that use a normally aspirated carburettor. On fuel injected engines, sometimes you can have an alternative air control, sometimes this is covered by a spring-loaded flap in the intake manifold and there is no lever for the pilot to actuate it.
If you would like to know more:
https://www.enginehistory.org/Access...lSysHx08.shtml
https://www.enginehistory.org/Access...lSysHx09.shtml
This may or may not be relevant - I cannot speak about the Mosquito but with the Lancaster it was referred to as the "carburettor air-intake heat control"
All 4 engines were controlled by a single lever that had 3 positions, cold, warm and hot (or on some earlier versions just cold and warm). May be worth searching for "carburettor air-intake" or "air intake control" rather than carburettor heat?
All 4 engines were controlled by a single lever that had 3 positions, cold, warm and hot (or on some earlier versions just cold and warm). May be worth searching for "carburettor air-intake" or "air intake control" rather than carburettor heat?
I have a set of pilot notes for the Mosquito TIII (Merlin 21 or 23 engines). They are a copy of an Air Ministry document dated August 1943. I was not able to find any reference to carburettor heat or anything similar. Probably not related to the model in question.
I remembered that the FB.VI should have a Merlin 2x, but couldn't recall exactly which until I looked it up. Packard-Merlin 31 and 33s were the equivalent of Rolls-Royce Merlin 21 and 23s.
Re the Lancaster carb heat settings. The Mosquito FB.VI was a relatively low-altitude daylight variant. Would carb heat be relevant?
Last edited by DHfan; 3rd Feb 2024 at 00:38.
Ref the FB 6 and FB 26 PN..page 14,para 25,highlighted,covers `Carburettor De-icing(Mk26 when fitted); each engine had a 9.5 gal tank and pump,to pump alcohol into the carb.in icing,or de-ice the carburettor,at 2-2,5 gph (lo) or 7.5gph on Hi setting...
trying to help a friend to understand the carburettor heat controls on the DH Mosquito Mk FB40
British built engines had two barrel SU carburetors which were apparently subject to icing, hence jonkster's comment about the Lancaster being so fitted with icing controls, as was the Lancastrian and Merlin Beaufighter, but oddly Spitfire and Hurricane manuals make no mention of carb heat. Perhaps because the the SU carburettors prevented carb icing by having hot engine oil fed inside the carb throttle plates and hot engine coolant was circulated around the choke tubes. These arrangements were effective to prevent carb icing but, incurred wasteful heating of the intake charge and the additional oil and coolant circuits were unwanted vulnerabilities that could contribute to engine failure.
Packard engines used a Bendix-Stromberg pressure carburettor which injected the fuel into the eye of the supercharger, thus avoiding icing issues.
Thread Starter
Megan, Thank you very much for that information. I will get back to you.
The Mrerlin was built in many variants, some being applicable to only one aircraft type, see NOTE (2) regarding allocation of Mark numbers.
Commercial Merlin versions. Some warbird operators are fitting commercial Merlins because of their beefed up components.
Merlin 500 series: Two Speed - Single Stage Supercharger
Identical to Merlin T24-2 but termed Merlin 500 for Civil or Commercial operator
500 B.O.A.C. Lancastrian York
500-2 B.S.A.A. Lancastrian York
500-3 Alitalia Lancastrian
500-4 Skyways Limited Lancastrian York
500-5 F.A.M.A. Lancastrian York
500-6 Silver City Airways Lancastrian
500-20 Fiat G.59
500-21 Flight Re-Fuelling Ltd Lancastrian
500-23 Egyptian Government Lancastrian
500-29 CASA C.2111
500-45 Hispano HA-1112
501 T.C.A. Lancastrian
502
502-1 B.O.A.C. York
504 No Production
530 No Production
539 No Production
549 No Production
Merlin 600 series: Two Speed - Two Stage Supercharger
600 Tudor Prototype (Converted to Merlin 102A)
604 Argentine Government
620 T.C.A. & RCAF D.C.4 M.1
621-1 B.O.A.C. Tudor II
621-2 B.S.A.A. Tudor II, IV, V
621-5 Flota Aerea Mercante Tudor
621-15 Argentine Government Lincoln
622 T.C.A. (Domestic) D.C.4 M.2
623-2 B.S.A.A. Tudor IV
624-10 T.C.A. (Atlantic) D.C.4 M.2
625 No Production
626-1 B.O.A.C. Canadair IV C.4
626-12 Canadian Pacific Canadair IV C.4
630 No Production
631 No Production
640 No Production
641 No Production
Merlin 700 series: Two Speed - Two Stage Supercharger
724-1 B.O.A.C. Similar to Merlin 626-1 with cooling mod.
724-1C B.O.A.C. As Merlin 724-1 with crossover exhaust
722-10 Canadair As Merlin 622-10 with cooling mod.
724-10 Canadair As Merlin 624-10 with cooling mod.
Source: Rolls-Royce Production Drawing Office, February 1953.
Commercial Merlin versions. Some warbird operators are fitting commercial Merlins because of their beefed up components.
Merlin 500 series: Two Speed - Single Stage Supercharger
Identical to Merlin T24-2 but termed Merlin 500 for Civil or Commercial operator
500 B.O.A.C. Lancastrian York
500-2 B.S.A.A. Lancastrian York
500-3 Alitalia Lancastrian
500-4 Skyways Limited Lancastrian York
500-5 F.A.M.A. Lancastrian York
500-6 Silver City Airways Lancastrian
500-20 Fiat G.59
500-21 Flight Re-Fuelling Ltd Lancastrian
500-23 Egyptian Government Lancastrian
500-29 CASA C.2111
500-45 Hispano HA-1112
501 T.C.A. Lancastrian
502
502-1 B.O.A.C. York
504 No Production
530 No Production
539 No Production
549 No Production
Merlin 600 series: Two Speed - Two Stage Supercharger
600 Tudor Prototype (Converted to Merlin 102A)
604 Argentine Government
620 T.C.A. & RCAF D.C.4 M.1
621-1 B.O.A.C. Tudor II
621-2 B.S.A.A. Tudor II, IV, V
621-5 Flota Aerea Mercante Tudor
621-15 Argentine Government Lincoln
622 T.C.A. (Domestic) D.C.4 M.2
623-2 B.S.A.A. Tudor IV
624-10 T.C.A. (Atlantic) D.C.4 M.2
625 No Production
626-1 B.O.A.C. Canadair IV C.4
626-12 Canadian Pacific Canadair IV C.4
630 No Production
631 No Production
640 No Production
641 No Production
Merlin 700 series: Two Speed - Two Stage Supercharger
724-1 B.O.A.C. Similar to Merlin 626-1 with cooling mod.
724-1C B.O.A.C. As Merlin 724-1 with crossover exhaust
722-10 Canadair As Merlin 622-10 with cooling mod.
724-10 Canadair As Merlin 624-10 with cooling mod.
Source: Rolls-Royce Production Drawing Office, February 1953.
Thread Starter
Megan, Thank you so much, I have sent you a PM.