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nzjetboating.com Forums => Jet Units & Driveline => Tech Library => Impellors => Topic started by: mark1982 on October 30, 2011, 13:10:25 PM

Title: 773 new scott running gear
Post by: mark1982 on October 30, 2011, 13:10:25 PM
hi all I've got a old keelow craft with a 350 and 773,just put new scott 19 bullet&2  19 three blades impellors in what a huge difference on the old Hamilton 19s.
first run was with a 95mm insert pulled revs back to 4400 and got 76km
2nd run 100mm insert 4650 revs 80kms
3rd run 105mm insert 4700 revs82kms
4th run 110 insert 5000 revs 85kms
new sdm trim nozzle real good,these speeds are with trim up fully,for my set up the 100mm was the best allround out off the water and good top end speed.
Title: Re: 773 new scott running gear
Post by: mark1982 on October 31, 2011, 20:16:23 PM
fixed the numbers above,the old impellers were ok had a southcant jet nozzle with a 90mm insert tapped out 76kms 4500rev was all i could get. old set up was hj 19 bullet& 2  19 degree brass 4 blade impellers,
Title: Re: 773 new scott running gear
Post by: mohawk on October 31, 2011, 21:07:28 PM
Did you try the old blades with the new noz ?   
Title: Re: 773 new scott running gear
Post by: mark1982 on November 01, 2011, 20:54:23 PM
no, did try new blades with the old nozzle with the insert removed went good, with no insert hole size 106mm