Official Fulqrum Publishing forum - German Prop Pitch Lever

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- - German Prop Pitch Lever (http://forum.fulqrumpublishing.com/showthread.php?t=22549)

Quote:

Originally Posted by Ze-Jamz (Post 286118)

What?

You have to set keys to "prop pitch engine #1", its work.

(Thx Sokol1, good idea)

Quote:

Originally Posted by VO101_Tom (Post 286129)

You have to set keys to "prop pitch engine #1", its work.

(Thx Sokol1, good idea)

I see..

yes it does work..thanks all

Thx for the tip. Very helpful.

Bf109 pitch video

I can't find the post where this video was requested. Well, here it is, it's self-explanatoy ;)

http://www.youtube.com/watch?v=5kcCWt7rUNQ

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.

In Bf109 pitch control is electric. A battery maybe control it while engine is not running...

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.

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?

Quote:

Originally Posted by Blackdog_kt (Post 287535)

Actually I seem to have found the answer, looking for a while now.

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 :)