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Old 01-24-2017, 11:21 AM   #1
Davros23
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Default Engine cutting out at around 17,000 ft

I have an interesting problem with the Spitfire when climbing. It doesn't happen all the time (happens about 4 times out of 5) but when it does it's quite frustrating. Climbing in various configurations but typically at boost +12, RPM 2850, with second stage supercharger engaged (light on) and IAS between 170 and 190 mph the engine cuts out at around 17,000 ft. Levelling off and reducing the boost to 0 or +2 will get the engine going again. At the point the engine cuts out the radiator temperature will start to fall quite dramatically (to under 60C) and won't recover even after the engine has restarted, until I descend to a lower level. Oil temperature during the climb climbs to around 90C then starts falling slightly when the second stage kicks in.

On other occasions, with exactly the same climbing configuration, the aircraft will climb willingly to over 35,000 ft, no problems.

Any ideas? To make things more interesting I'm starting to think the problem is more persistent on multiplayer servers so possibly it's an environmental issue?
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Old 01-24-2017, 11:49 AM   #2
philstyle
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Turn on
1 - the fuel pump switch just beneath your elevator trim wheel (left side of cockpit), and
2 - the fuel pressure butterfly valve, above your right foot
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Old 01-24-2017, 12:08 PM   #3
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Quote:
Originally Posted by philstyle View Post
Turn on
1 - the fuel pump switch just beneath your elevator trim wheel (left side of cockpit), and
2 - the fuel pressure butterfly valve, above your right foot
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Old 01-24-2017, 12:13 PM   #4
Davros23
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Thanks Phil. Note the fuel pressure warning light has not come on so I'm unsure about that. However, the RAF manual says the following -

(iii) Use of the booster pump(s)
(a) The main tanks booster pump should be switched ON for
take-off and landing and at all times when these tanks are in use
in flight.
{b) The rear fuselage tanks booster pump should be switched
ON at all times when changing to, or using fuel from, these
tanks.


This may therefore have something to do with it, I shall try and see if that helps! Anyone know where the rear booster pump switch is?
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Old 01-24-2017, 12:28 PM   #5
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Quote:
Originally Posted by Davros23 View Post
Thanks Phil. Note the fuel pressure warning light has not come on so I'm unsure about that. However, the RAF manual says the following -

(iii) Use of the booster pump(s)
(a) The main tanks booster pump should be switched ON for
take-off and landing and at all times when these tanks are in use
in flight.
{b) The rear fuselage tanks booster pump should be switched
ON at all times when changing to, or using fuel from, these
tanks.


This may therefore have something to do with it, I shall try and see if that helps! Anyone know where the rear booster pump switch is?
There is no rear tank and therefore no booster for it.

Just turn on the main pump only and leave it on.

This instruction has been left out of the manual.

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Old 01-24-2017, 12:30 PM   #6
Davros23
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By the way I'm making an assumption here that the fuel pump switch and the main tanks booster pump are the same thing?

I also notice the fuel pump switch is not mentioned operationally in the manual.
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Old 01-24-2017, 12:31 PM   #7
Davros23
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Thanks Holbeach, what I figured.
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Old 01-24-2017, 02:53 PM   #8
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Quote:
Originally Posted by Davros23 View Post
(a) The main tanks booster pump should be switched ON for
take-off and landing and at all times when these tanks are in use
in flight.
Since there's no way to fly without use tanks, leave ON.
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Old 01-24-2017, 05:16 PM   #9
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Quote:
Originally Posted by Sokol1_br View Post
Since there's no way to fly without use tanks, leave ON.
I didn't read carefully (shame on me), but is that true also when using drop tanks?
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Old 01-24-2017, 10:32 PM   #10
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I like to flip every switch inside an airplane to "ON" pretty much any time I climb into an airplane, or an e-plane, as long as the manual doesn't prohibit that prior to startup, and/or that might cause avgas to uh... flow onto the pavement because external tanks aint attached... so, yeah, if it says fuel, leave it on till its time to park and have a beer lol
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