APC Folding Prop Hub 50mm

This is the 55mm Folding Propeller Center for a 45mm Spinner from
Advanced Precision Composites.
For use on Electric powered airplane only (not for gas engines).

FEATURES:
Two-piece, gray composite prop center that goes on each side of
    the folding prop blades to hold them in location (blades are not
    included, see REQUIRES)
Center has actually molded nut insets for easy tightening
Can be found in a bag attached to a header card

INCLUDES:
One composite prop center
2 3x10mm cap head screws
2 3mm nuts
2 3mm washers

REQUIRES:
Propeller blade sets (usage APCQ4305 through APCQ4360)
2.5mm hex wrench (GPMR8012) to tighten up cap head screws
Hand and eye protection when operating prop

SPECIFICATIONS:
Overall Length: 63mm
Length between blade installing centers: 50mm
Inner installing size: 8mm

COMMENTS:
See prop blades for assembly instructions.
Sailplanes have no landing gear, and for that reason would break a rigid
    prop when the plane came in for a landing. The folding
    prop folds back upon landing.
The usage of this center will reduce the overall size of the prop
by 10mm from the maker's length listing.