Spitfire IIa prop pitch

[Crumpp]

I think the confusion comes from the fact the propeller is electric. An electric motor is what changes the blade pitch.

The motor is operated by a hydraulic switch in normal operations and functions as a CSP. The hydraulic's reads the engine rpm and converts it hydraulic pressure with a regulator. That pressure then operates the electric motor to adjust the blade pitch to maintain the calibrated rpm. This way, both engine and propeller can be operated with a single lever in normal operations.

In an emergency, the pilot can manually operate the electric motor to change the blade pitch to maintain rpm or feather the propeller should he lose hydraulic pressure.

[VO101_Tom]

Originally Posted by Crumpp

I think the confusion comes from the fact the propeller is electric. An electric motor is what changes the blade pitch.
...

Hi.
The 109 had no hydraulic prop pitch, just a simple electric rpm regulator and motor. That was the point, is that hydraulic failure does not cause an failure of PP. Fw-190 has elektro-hydraulic combined system. I think this verstellgerät, which showed that belongs to 190's BMW engine.

[TomcatViP]

Thx Tom

It seems I mixed both the 109 & 190 system.

[Crumpp]

The 109 had no hydraulic prop pitch, just a simple electric rpm regulator and motor.

I am confused, are you thinking what I told you was wrong? It is not. The FW-190 and the Bf-109 have the same basic system. An electric propeller controlled by a hydraulic switch. The picture I posted is the BMW 801's system which basically combines many of the separate components of the 109 system into a single unit.

The motor is operated by a hydraulic switch in normal operations and functions as a CSP. The hydraulic's reads the engine rpm and converts it hydraulic pressure with a regulator. That pressure then operates the electric motor to adjust the blade pitch to maintain the calibrated rpm. This way, both engine and propeller can be operated with a single lever in normal operations.

That is the function of the Drehzahlregular. If you look at the diagram, you can see where it is mounted to the engine pad and connects with a splined shaft. It requires an oil filter because the engines oil circulates through it and it reads the pressure to meter the amount of current to control propeller rpm, ie...blade pitch.

It seems I mixed both the 109 & 190 system.

No you haven't mixed them up. They work exactly the same. The propellers are ELECTRIC but are controlled by a hydraulic switch. I think there is confustion over the hydraulic switch. That hydraulic switch is an ELECTRICAL Switch that meters electrical energy based on hydraulic pressure. It changes the electrical current going to the propeller based on the engines oil pressure.

[VO101_Tom]

Originally Posted by Crumpp

I am confused, are you thinking what I told you was wrong? It is not. The FW-190 and the Bf-109 have the same basic system. An electric propeller controlled by a hydraulic switch. The picture I posted is the BMW 801's system which basically combines many of the separate components of the 109 system into a single unit.

The basic principles can be the same, can not argue with this, but the BMW Commadogerät is a bit different device than the 109 VDM auto PP. The only hydraulic equipment in the 109 the landing gear.

190's Commandogerät:

[Crumpp]

The basic principles can be the same, can not argue with this, but the BMW Commadogerät is a bit different device than the 109 VDM auto PP. The only hydraulic equipment in the 109 the landing gear.

190's Commandogerät:

We are not talking about the Kommandogerät, we are discussing VDM hydraulic electric propellers. The KG is a completely seperate device and no, it is not the same as the system found on the Bf-109 and nobody ever said it was either. Both the FW-190 AND the Bf-109 use the same type of VDM hydraulic electric propeller. That is a fact. I am not telling you this out of a passing interest. I happen to know what I am talking about because I deal with the real thing.

Crumpp says:
The propellers are ELECTRIC but are controlled by a hydraulic switch. I think there is confusion over the hydraulic switch. That hydraulic switch is an ELECTRICAL Switch that meters electrical energy based on hydraulic pressure. It changes the electrical current going to the propeller based on the engines oil pressure.

Crumpp says:
That is the function of the Drehzahlregular. If you look at the diagram, you can see where it is mounted to the engine pad and connects with a splined shaft. It requires an oil filter because the engines oil circulates through it and it reads the pressure to meter the amount of current to control propeller rpm, ie...blade pitch.

Do you know who I work for?

http://www.white1foundation.org/

Here is OUR Kommandogerät....

http://www.white1foundation.org/part...andogerat1.jpg

YES IT WORKS..

We are also the North American distributor for Motobende. Do you know who they are?? He specializes in Diamler Benz inverted V's. Schwarze-man works for Dirk.

The seven-cylinder Bramo Siemens SH-14 radial engine was stripped,
overhauled, and rebuilt by Dirk Bende of Motobende Gmbh. This company,
based at Köningswinter-Sassenberg near Bonn, specializes in the overhaul of
German-built World War II-era engines and the remanufacturing of engine parts.

http://quax-flieger.de/sites/default...geSept2011.pdf

[Crumpp]

Here is OUR VDM hydraulic electric propeller:

http://www.white1foundation.org/parts/prop_assemb2.jpg

It functions the same as all VDM hydraulic electric propellers. It functions the same in both the FW-190 and the Bf-109 series.

The only hydraulic equipment in the 109 the landing gear.

Negative Ghost rider.....

The propeller is a VDM hydraulic electric propeller. It functions as a CSP in hydraulic mode (don't get confused, hydraulic mode is when the hydraulic switch is turned on) and as a variable pitch propeller with the switch turned off.