The impellor has a 1.8mm inside diameter and is therefore press-fit onto the prop. The requirements for a waterjet impellor normally include no gaps between the blades, a fine pitch and very close tolerences between the tips of the blades and the inside of the jethousing. The impellor i used was bought from a hobby shop and was larger than 16mm, this is so that i can carefully trim it to fit the inside of the jet housing. brass is used as it is quite soft and will not scratch the inside of the 2mm hole. (the size of this hole depends on the size of the shaft and must be tolerant to within 0.10 mm. Exist - Untukmu ibu Dm Oh ibu A Dm Kau di siram bayu pagi A A Kehilangan terasa kini dan kesepian Dm Dan aku A Dm Bagai purnama gerhana A A Diibarat lautan kering A Tiada tempat ku layarkan Gm Hasrat ku ini A Masih belum sempat kubuktikannya A Gm Kepadamu ibu. It is then setup in the metal lathe and a 16mm hole is drilled into one side of it, 10mm deep, and then a 2mm hole is drilled all the way through for the prop. There is no strumming pattern for this song yet. To start with, the 20mm aluminium rod is cut to a 40mm length, this will be the main jet housing. Note: an impellor is a propellor that turns inside a housing. To the main jet housing a stator, impellor, nozzle, water seal, steering nozzle and plastic seat is added. The jetdrive is made from a 20mm stock diameter of aluminium because its light, corrosion resistant and easy to machine.
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