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Old 10 November 2008, 12:42   #1
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Country: UK - England
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Make: humber assault 5.5
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humber 5.5m assult cruising speeds

i have humber 5.5m assult with opti 115hp, with 5 on board and 75lts of fuel we seem to race up to 37knts{in resonable conditions} but then we start to chine walk quite alarmingly i back off throttle and things calm down , 33knts is a good easy cruising speed, am i asking too much to want to cruise faster, or is it my inexperience?
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Old 10 November 2008, 13:36   #2
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Quote:
Originally Posted by seafreak View Post
am i asking too much
Yes , we aim to cruise at 25 knots

It's well over powered for an Assault, 75hp Would be ample.

Is it Dave Grittifths old boat?

Jono
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Old 10 November 2008, 14:30   #3
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The 5.5 Assault is only rated to 90hp and 175kg, the dry weight of your Opti is 170kg so its boarder line.
Not sure how much this is contributing to your problems but the fact its over powered won't help things.

Phill
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Old 10 November 2008, 15:07   #4
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I wouldn't want to hit any waves or bumps in an assault at 37knts. Your feet would come up through your body.........
I thought hitting small waves at 25knts was bad enough, one of the reasons I got rid of mine.
You must be well 'ard
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Old 10 November 2008, 15:18   #5
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80% of our customer that come to sea trial Assaults buy Destroyers, the other 20% want to keep them in a garage or only have a mini metro to launch with. I still like the 4.7m & 5m Assualt.

Jono
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Old 10 November 2008, 15:33   #6
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forsure theres nothing well ard about me, just want to make the most of what i got. i re engined this humber, the boat is year 2000 and the sales lit that came from humber states 174kg max and 115hp so i just went for the max i could, although if you look at the latest sales blurb , humber seem to have calmed the assault down a bit to 90hp. anyway this is what ive got until i can afford to put this engine on something else, so, should i be happy to cruise at 33kts or does anyone have any ideas?
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Old 10 November 2008, 15:40   #7
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You should be happy with 33knots, I'm happy at cruising at 30 knots in my 6.3 Ocean Pro, just be carefull at full revs it a quick rig

Jono
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Old 10 November 2008, 15:43   #8
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Whats the CE plate say your Assault is rated to?
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Old 10 November 2008, 16:11   #9
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i,ll check for the ce plate when i next get down to hamble point, i,m not sure where to find it though. thanks for all your info,i just wasnt sure if i was geting the best out of it. so guys, if i want to cruise more quickly with my opti, and i love the humber, which one should i go for next time?
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Old 10 November 2008, 16:19   #10
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If your getting to your max speed really quick it could be under propped, are you hitting max rpm too?
The CE will be mounted on the inside of the transom, its usually near the Orca plate that Humbers have fitted.

If your happy with Humber a Destroyer or Ocean Pro might be the next move?
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