EAAAirVenture OshkoshShopJoin

Propeller ID needed

Posted By:
Mike DiFrisco
#1 Posted: 10/29/2009 12:15:02

A fellow Chapter 93 member is looking for some identification help for this prop. It was given to him by his uncle, but unfortunately has had the blades cut off about 1 foot from the center of the hub.  It has the markings "U S Propellers Inc" on one side and the opposite side is marked "DES   44K7797" and "SERAF4310060".  A number on the hub side is "10060".

It's curious that this prop had only 4 bolt holes which appear, not surprisingly, to be somewhat elongated and the prop looks to have some friction charring under the crush plate and hub.

Any ideas?


Files Attachment(s):
DSC_0007.JPG (211941 bytes)
DSC_0008.JPG (272418 bytes)
DSC_0009.JPG (226530 bytes)
DSC_0010.JPG (271782 bytes)
John Melvin
#2 Posted: 10/29/2009 22:56:59


This looks very much like a drone prop.  Probably mounted on a Nelson or McCullough 2 stroke engine. They turned pretty high RPM therefore used small diameter high pitch wood props.

The number SERAF4310060 is a typical Air Force number indicating:

Serial AF4310060

The 44K7797 may be the diameter and pitch info. Ie. 44" dia and 77" pitch at tip and 97" pitch at root.

This is all is an educated guess, but I think it's on the right track.

John Melvin


Enrico Bottieri
Warbirds of America MemberYoung Eagles Pilot or VolunteerAirVenture Volunteer
#3 Posted: 11/1/2009 13:51:41

John, I too think you are right... Love your  picture of the Spartan Executive. I used to work on them at the Spartan School of Aeronautics in Tulsa Ok. I was a student there, advanced students were allowed to work on live aircraft. I recall a model 7W?  Years later . I regrett that I did not purchase an Executive that was for sale in Denver Co. It had a stick instead of a wheel. I recall that the owner had an aircraft seat company. What an airplane, years ahead of its time.