Speed with 420 hp Mercruser
#1
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Speed with 420 hp Mercruser
Just calculating speed on a ribboat. We mainly work with outboards but the customer would like to have single 420 hp.
Boat is 9 meter and weight is around 900 kg without engine. A good hull from a fameous designer. Stepped...
Which leg for this engine? topspeed?
Boat is 9 meter and weight is around 900 kg without engine. A good hull from a fameous designer. Stepped...
Which leg for this engine? topspeed?
#2
Assuming 24 degree deadrise? That sounds awfully light. What do you figure the all-up ready to run weight will be? Most boats of this size range are in the 5000-5500 lb range Are you saying this one will come in at like 3500 lb with engine, rigging drive & fuel?
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i have been in an ex secret service 24' rib at 50 mph and it was pretty scary... a little bit faster with a little bit rougher water and i could see us ground looping that thing and everybody ending up in the water one way or another... i don't know what motor was in it but it sure as hell wasn't 400 hp...
good luck with THAT
Last edited by stevesxm; 03-03-2012 at 04:08 PM.
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I saw a simular boat weight about 1650 kg. And the plan is to build it light with a part kevlar.
So i change to 1300-1400 kg
http://www.airshipribs.com/airshipcms/
Airship is not the boat we work on but simular in style and size....
So i change to 1300-1400 kg
http://www.airshipribs.com/airshipcms/
Airship is not the boat we work on but simular in style and size....
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You should contact Rik @ Arneson about the ASD#6, hes here on the board by the same name. Super strong drive and in many cases efficient enough to run 8-10 mph faster than an equally equipped Bravo B1 or Volvo SX propelled boat and that goes both for mid range efficiency and top speed. Compared to the Mercury and Volvo counterparts, the efficiency is also nice in terms of MPG.
Besides that, the Bravo 1 drive is not exactly a great drive, just do a search on here.
Other ribs have been equipped with Arneson surface drives, so it should not be a problem, The ASDs are in a completely different league than any Bravo or Volvo drive.
Oh, and don't forget the rooster
http://www.arneson-industries.com/pa...oducts&id=asd6
Sounds like a neat project, good luck with it.
Besides that, the Bravo 1 drive is not exactly a great drive, just do a search on here.
Other ribs have been equipped with Arneson surface drives, so it should not be a problem, The ASDs are in a completely different league than any Bravo or Volvo drive.
Oh, and don't forget the rooster
http://www.arneson-industries.com/pa...oducts&id=asd6
Sounds like a neat project, good luck with it.
Last edited by A.O. Razor; 03-04-2012 at 07:55 PM.
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Thanks for the replay...
Arneson is on my list. Right now we calculate different engine and drives.
We have posibility to use excisting hulls from good brands, but we also planning for our own design.
Will tell you guys/girls what we will do in the future, it is for next summer...
Arneson is on my list. Right now we calculate different engine and drives.
We have posibility to use excisting hulls from good brands, but we also planning for our own design.
Will tell you guys/girls what we will do in the future, it is for next summer...