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Forum: General Boating Discussion

20-03-2007, 11:34 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

If you want to check out your lower unit ,thats...

If you want to check out your lower unit ,thats easy .
If yours is a 1,62:1 ,you have to turn the crankshaft 1,62 turn and the propshaft will turn 1 revolution.
You can use your flywheel to find...

Forum: General Boating Discussion

20-03-2007, 07:19 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Still the same ,no slip at all ?you should do...

Still the same ,no slip at all ?you should do normally 118 km/u or 74,2 mph with 10 % slip calculated.
I would check it again if pitch is right ,or if your rpm gauge is doing a good job.
check rpm...

Forum: General Boating Discussion

04-03-2007, 09:40 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Thats about 9% slip still its very good to have...

Thats about 9% slip still its very good to have such low slip,efficiency is great.
But some boats run their fastest speeds with 14-16 % slip ,in the end its no big deal how much slip there is ,as...

Forum: General Boating Discussion

04-03-2007, 09:31 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Did you measure speed with a gps ? Some water...

Did you measure speed with a gps ?
Some water pick up speedometers are easy off 10% .
I was assuming your 300xs is having 1,62:1 ?
that is the heaviest ratio merc has ,it could be stamped into the...

Forum: General Boating Discussion

04-03-2007, 09:18 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Its possible Gav ,I,ve seen it before some boats...

Its possible Gav ,I,ve seen it before some boats do have a lower slipfactor.

But generally 10 % is a perfect number ,What I see more on boats like this is a 12% slip factor.

John,guess I was...

Forum: General Boating Discussion

04-03-2007, 09:01 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Phantastic,are you sure the mirage is 23 pitch ? ...

Phantastic,are you sure the mirage is 23 pitch ?
Could it be a modified prop that has been tweaked to 27 or higher ?
The numbers do not match up with the prop you are turning at 6000 rpm,and 1,62:1...

Forum: General Boating Discussion

28-02-2007, 09:41 PM

Replies: 55

What speed will a 300XS give ?

Views: 6,664

Posted By sterling

Friend of us have a Cyclone 21 with a 300XS,that...

Friend of us have a Cyclone 21 with a 300XS,that boat runs 84 mph with a 28 bravo 1 labber,and I believe a 27 tempest is also close to 85.
The cyclone has a pad bottem,i don,t know what yours is...

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