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#1
05-22-2011, 09:27 PM
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I have a question for the veteran BF-109 technicians on this forum:
Does that actually work IRL? I mean, can you change the prop-pitch without a hydraulic pump running? Most prop pitch devices I know are operated by means of flyweights controlling valves that adjust pitch according to demanded pitch, and only works when the engine is running. Most modern planes, I believe, have a spring device set to push the prop to coarse (feather) pitch if the variable pitch unit or engine is lost. 
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#4
05-22-2011, 11:19 PM
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Yup, the flywheels and hydraulic assemblies are used in the governors of constant speed props. The 109 doesn't have a CSP, it uses an electric motor that directly commands changes to the pitch angle instead of commanding the desired RPM directly.
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#5
05-22-2011, 11:24 PM
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yep, but it would need a battery and I suppose it would only be used for the startup, not for adjusting prop pitch before turning the engine on. Then again wasn't the 109 hand started normally?
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#6
05-22-2011, 11:32 PM
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Quote:
The 109 seems to have the system built like this, using VDM License-built Hamilton Standard propellers: Pitch lever (electric) controls a motor (electric) which drives a pump (hydraulic) that changes propeller pitch. So, while some planes have a hydraulic pump fitted on the engine gearbox with a mechanical link between the prop pitch lever and the command-link in the prop pitch governor, the 109 does not. It has a closed system which indeed is a lot less vulnerable in combat. Seeing that the possibility to lose your engine is always present in combat, it would be favourable to have prop pitch independent from the engine  I think this is the conclusion to my question at least
Last edited by Strike; 05-22-2011 at 11:34 PM.
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