Mosquito and FM-2 update.

[Scherf]

I've only ever seen references to "the plugs" in general terms - seemed to be a risk for all cylinders at long periods of low power.

That said, I've never seen any account of the Mosquito's war through the eyes of the groundcrew - it's a big gap really.

[Karnak]

Krusty,

The Mossie in AH is at +18lbs boost on WEP at the critical altitudes.

No Mosquito Mk VI was limited to +14lbs boost.  The Merlin 21 and 23 were limited to +12lbs boost and the Merlin 25 (like in AH) was limited to +18lbs boost and later to +25lbs boost with 150 octane.

[Charge]

"Interesting, were they concerned with all or just some of the plugs loading up?"

AFAIK, the problem was not the plugs itself but the deposits forming on the plug electrodes (because of the additivs in 150 Oct) which tended to burn and form on electrodes permanently if the engine was not run up at higher boosts from time to time. The new plugs just were up to withstand the higher thermal stresses of increased boosts. The engine would run on old plugs as well but the possibility of a plug failure would be significantly increased.

-C+

[Bronk]

Charge I understand deposits on plugs .
What I'm looking to figure is if was just some of the plugs on a given bank.





Looking a this picture tells me the last 3 cylinders for this bank receive less exhaust scavenging  than the first 3.
Trying to jet a carb for best performance through all rpm ranges is tricky enough.
Compounding it with uneven exhaust flow, i picture tech guys pulling there hair out.

If I jet for optimal air/fuel mixture at WOT (Wide open throttle) for the back 3 cylinders I risk burning out the first 3.  This would be due to a lean condition cause by better exhaust flow.

I am guessing they jetted the carb for optimal WOT on th first 3.
While this might cause a slight rich condition on the back 3 at WOT . It would run without risk of losing a cylinder.
During slow / normal cruse however I suspect you would run the risk of fouling the 3 rear plugs on each bank.



Bronk
Edit:

I'm referring only to the sax pipe. Not the damper system as a whole.

[Karnak]

Bronk,

There is a reason only about one third of Mosquito Mk VIs had an exhaust shroud instread of ejector stacks designed simply to boost the jet effect.

I hear the ground crews hated the flame dampers due to maintainance headaches too.

[Bronk]

Originally posted by Karnak
Bronk,

There is a reason only about one third of Mosquito Mk VIs had an exhaust shroud instread of ejector stacks designed simply to boost the jet effect.

I hear the ground crews hated the flame dampers due to maintainance headaches too.

Are you referring to the shroud or the sax pipe?

Bronk

[Neil Stirling]

Mosquito FB VI Pilots notes. Boost limits Merlins 21,23 and 25.
http://www.wwiiaircraftperformance.org/mosquito/mosquito-vi-pilot-notes-op-data.jpg

http://hometown.aol.co.uk/JStirlingBomber/Mossi+VI+Merlin21.jpg

Neil.

[Karnak]

Originally posted by Bronk
Are you referring to the shroud or the sax pipe?

Bronk

The whole thing.

Look at photos of Mosquito Mk VIs and you'll see that most have exhaust stacks that look the same as the Spitfire's.

[Ball]

I think the Mosquito may be next in line for an update.  If you think about it there aren't many allied aircraft left to do, especially those that fit with the 8th Airforce theme and would have the range to go into Germany.

Would certainly be fun to go in doing some tree top level sorties in the Mossie.  Or even high level 400+ mph stuff in the bomber mossies if they add them, or photo recon if they make a feature of it in CT.

The Mosquito has so much AH gameplay potential which is sadly missing

[Angus]

Every word true.
Ball and Karnak