Some test data for this nice micro park jet motor. If you want a bigger parkjet motor I would suggest the 2212-06 from this post.
Dimension: 23mm x 24mm
Weight: 25.5g 0.89oz (kv2050) (not including connectors)
Diameter of shaft: 3.0mm(EDF/EDP)
Length of front shaft: 8mm
Prop: 7035 (GWS)
thread on rcgroups: http://www.rcgroups.com/forums/showthread.php?t=813808#post9088385