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Guest
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 Posted: Mon Jul 19, 2010 10:10 pm Post subject: |
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more pic's
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BRASS KNUCKLES
Joined: 13 Jul 2010
Posts: 2
Location: Alberta
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| Posted: Mon Jul 19, 2010 10:14 pm Post subject: |
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Too bad there isn't a place for these Bratt Jet guys to advertise thier own boats. You dont see Firefish and Explorer owners posting pictures and specs of thier tubs.
Went to check out the Brattjet.com web site and got airplane sales and flight info. Thier own site isnt even launched yet...
Things must be gettin tough...
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Guest
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| Posted: Mon Jul 19, 2010 11:16 pm Post subject: |
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I own and like both brands equally.
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DiggsNWT
Joined: 14 Jul 2010
Posts: 64
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| Posted: Mon Jul 19, 2010 11:19 pm Post subject: |
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| BRASS KNUCKLES wrote: | Too bad there isn't a place for these Bratt Jet guys to advertise thier own boats. You dont see Firefish and Explorer owners posting pictures and specs of thier tubs.
Went to check out the Brattjet.com web site and got airplane sales and flight info. Thier own site isnt even launched yet...
Things must be gettin tough... |
I asked Bling Bling about how he liked his boat, so I can take some heat for getting on that tangent. I am not sure it is fair to say he is posting specs about his boat...other than engine/jet and impeller info. Granted...the photos are great advertising.
So back to the thread topic...for a cruising boat (which will be my use), I am going to want an engine matched to a jet/impeller combo that will see my rpms closer to the max torque levels. Max hp levels are for speed and burn more fuel.
Do I look for WOT at max torque, or about 80% of WOT, as indicated by Alumaman?
Diggs
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Guest
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| Posted: Mon Jul 19, 2010 11:23 pm Post subject: |
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couple more pic's
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Guest
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| Posted: Mon Jul 19, 2010 11:50 pm Post subject: |
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Diggs, I would say Alumaman is giving good advice, 80 to 100 % of Peak TQ is were you want WOT. This is just my 2 cents, Some guys like to run the really big impellors with lower rpm, but I like to rev a bit higher and have the extra punch of the motor for running skinny braided water.
Cheers, have fun with your new boat.
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JET1
Joined: 03 Jun 2010
Posts: 42
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| Posted: Tue Jul 20, 2010 10:58 am Post subject: |
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| Rapid Transit wrote: | | Jet 1.... the only way you can turn the smaller impellor twice as fast is by reving your motor faster, the only way you can rev your motor faster is to put more fuel through it, don't forget they are direct drive, the difference is the amount of torque you have, giving you the ability to hold the desired rpm without having to work as hard to maintain = less fuel, and depending on the type of hull you have you may not need or want to turn 5800 rpm, which in turn = more reliability and longevity for the last few rpm that you would hardly, if ever use , sounds like the 19 ft bratt is matched up correctly for loads and cruising with the family, is the 525 going into the same style of hull ? |
Thats what im trying to get out is that it doesnt necessarly take more fuel to make that higher rpm using my wifes jeep as an example it gets better milage at 80kms with the overdrive turned off turning higher rpm. the motor makes its power from the energy stored in the fuel. so under less load it takes less fuel to make more rpm, after overcomming the resistance of the motor its self its almost linear power made to fuel used. hw much power the motor makes depends on how well it processes the fuel it uses. different charistics effect the power curve the reason a power curve falls off is because the engine stops adding enough air to properly burn the fuel added. the motor should be the most efficient on fuel at the peak of the torque curve. so you should be setting the pump to match the motor not vise versa at speed you want to go if you set the pump to run at the rpm of max torque you wil get the best fuel economy. if you dont believe me use a prop motor as an example google fuel economy in lake boats they change the prop to use the full power curve of the motor and they all use the same amount of fuel to go the same speed the bigger motors just have more in reserve or can go a faster speed. 4.3 or 8.1 if you only need 200 hp to go such a speed they both use very similar amout of fuel to make 200hp they just do it at different rpm
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Rapid Transit
Joined: 20 Jun 2005
Posts: 206
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| Posted: Tue Jul 20, 2010 2:19 pm Post subject: |
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| whatever you decide..you will be the most happy with
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