ID Help/ Early Wooden Propeller Lang Products Liberty Motor

[PaulB]

My brother purchased an early 8 foot wooden propeller some years ago. It appears to be unused as cork still fills the 8 holes around the hub. The hub bears the markings in a circular pattern as follows:

No 5472 PITCH 6.65 DIA 8-4 D.R.G. No. SE5090
LH HP 870(370?) Liberty Motor
LANG PRODUCTS CO

To one side of the hub the letters RNA and then GW within a small circle are stamped.
The other side bears the Letters RDW.

There is also a label.

Any help or knowledge would be appreciated. Pics at the following link.

http://s524.photobucket.com/albums/cc327/paulb_018/

[Dave]

That's part of a 4-blade combination (two propellers stacked together) used on the Curtiss HS2L aircraft during and after WW1. More information on this link.

There is an excellent display HS2L with those propellers at the Air Museum in Ottawa, Canada.