Flottorp Prop ID

[RCalcutt]

I have recently acquired an old Flottorp wooden prop. It is 69” in diameter, its boss diameter is 6 1/8” with a thickness of 2 ½”. The centre hole diameter is 1 ¾”. The bolt holes (six) are 3/8” diameter and centred on a 5” circle.
It has the following stamped on it
17817
DESIGN 129-27
RPM 2700
HP 60
See attached photos.
Any information anyone could let me have would be very welcome.

Overall view
http://i218.photobucket.com/albums/c...t/Prop-001.jpg
Data stamp
http://i218.photobucket.com/albums/c...t/Prop-002.jpg
Decal
http://i218.photobucket.com/albums/c...t/Prop-003.jpg

[Dave]

That's an earlier design number. I don't know it was used on, but it had a Type Certificate number of 672 and its certification expired September 3, 1948.