Mercedis Prop info

[Von Writter]

Hi All;
I'm new to this forum and I should introduce myself. My name is Troy Wright (yup "Those Wrights") and I am building a full size Fokker DVII.
I have been developing an engine for this plane for a few years and it is running very well but I can't seem to find any plans or drawings for the 180ps Mercedis prop. I have had a prop built for it but it is wider and a bit shorter than what I understand the DIIIa prop to have been. It was 2780mm diameter and 220mm pitch? Does any one know where or if drawings are available for this prop of if one exists that drawings can be taken from to make an accurate replacement? I'd be very grateful for any and all help.
Here is my wife holding up my current prop (Bairly )

And the engine during testing;

[abufletcher]

Achim Engel and the Fokker Team Schorndorf have made two replicas of the DVII. Dig around at the site below and I believe you will find both a series of photos showing the making of an Axial propeller as well as full scale draftings of the prop (possible for sale):

http://www.collectors-edition.com/f-...D7_english.htm

[abufletcher]

BTW, I would assume that whatever prop you use would have to be deisgned for the specifications of the actual engine you'll be using.

[Von Writter]

Hi abufletcher;
Achim dosn't have a complete set of drawings for this prop so I ran into a dead end there. He has a set of drawings for the rotary prop but not the 180ps engine so I was hoping someone here might know where it was available.

[Bob Gardner]

Hello Troy,

In case it is of any help there is a photo of a Mercedes D VII prop on my website at;
http://www.aeroclocks.com/Prop_pages/1042.htm

To emphasise Abufletcher's point, early engines such as the Mercedes DIII were slow reving, high torque engines. The maximum engine speed was about 12-1300 rpm. The design of propeller fitted to them would have been tested by the Flugzeugmeisterei to about 20% above this speed. In other words, this prop was built to operate up to around 1500rpm. By comparison, modern engines generally operate in the 2-4000rpm band and hence need a prop designed to those characteristics.

With regards,

Bob

[abufletcher]

Are you sure? The following mentions that they can custom make props for the Mercedes 160PS.

http://www.collectors-edition.de/Sal...ex_english.htm

[abufletcher]

Troy, gorgeous prop BTW! It's great to see a Wright carrying on the tradition.