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Old 15 April 2007, 15:58   #11
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Quote:
Originally Posted by jwalker View Post
Then he needs to learn how to adjust it and drive it.
So what adjustment would you suggest seeing as he had the engine trimmed in fully?

Chris
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Old 15 April 2007, 16:14   #12
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Chris1573: Does your Viper run similarly, ie with most of the keel above the water when she's on the plane?
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Old 15 April 2007, 16:16   #13
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Quote:
had a mariner 90 on a 5.3 ocean pro,
Ocean pros-completely different animal to an assault! excellent hulls.
we have driven them all, all round the world-destroyers/ocean pros and assaults.
As for the assault- well its never gonna be brilliant (or even good)thats for sure, but stick plenty of weight up there in the bow/anchor compartment and keep the fuel tank in front of the consol-makes a lot of difference but still nothing like destroyers and ocean pros.
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Old 15 April 2007, 16:18   #14
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Downhilldai The viper has a much deeper V than the Humber so was not so noticeable however with the Humber it was like it was skipping over the waves and almost airborne most of the time. The difference between the two boats was very noticable the Viper being much more stable and suited to rougher water.

I think the 90 is too much for the Humber and suggested to my friend that a 60HP would probably be enough!



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Old 15 April 2007, 17:03   #15
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I was alongside a Viper like yours last summer and I noticed that almost the entire length of the keel was out of the water when she was planing. This looked strange, but didn't seem to affect the way she handled rougher stuff. I put it down to the large planing pad at the rear of the hull.
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Old 15 April 2007, 17:32   #16
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Quote:
Originally Posted by Downhilldai View Post
I was alongside a Viper like yours last summer and I noticed that almost the entire length of the keel was out of the water when she was planing. This looked strange, but didn't seem to affect the way she handled rougher stuff. I put it down to the large planing pad at the rear of the hull.
I hope that wasn't me,it sounds like she was over trimmed. I love the 'defend what you own' attitude that prevails on this site. Perhaps it's an attempt to protect residual values rather than admit to any flaws.Or, having little or no experience of any other boats/engines/bits of electronics and not knowing any differently. It sounds like those Humbers handle like a skip.
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Old 15 April 2007, 18:01   #17
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same happened to mine, had a mariner 90 on a 5.3 ocean pro, and i could never trust it in a steep turn!! felt unweildy
Merc 90 on 5.3 Destroyer. Absolutely solid heeled right over and provided you trim in a bit, no cavitation. Chine walk? At 40 knots,(WOT) trimmed right out with wavelets on the beam, yes - sometimes. Otherwise, no.

The engine is the pretty much the top weight for the boat, I believe, but with the anchor and a small inflatable dinghy stowed forrard, she's 'chust sublime'.

I spent part of yesterday floating in and around the Gulf of Corryvreckan with two other RIBnetters. The 5.3 Assault with 60 Yam (I think) is very different from my Destroyer above the water, but when we left the Bay of Pigs (North end Jura) the ebb was at its height and it was 'choppy' , but the little yellow assault looked a picture as she just zoomed away. Must have hit as many concrete blocks as I did, but it didn't show. At displacement speed they were trimmed well down by the bow though, so I guess they got it right.

Humber's been in business a long time, so they must be getting it right, even though some models seem to be better than others at some things.
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Old 15 April 2007, 18:07   #18
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I hope that wasn't me
Nah. It was probably me but I don't remember him running alongside. Most of the time he was eating rooster.
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Old 15 April 2007, 18:15   #19
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Quote:
Originally Posted by jwalker View Post
Then mount the motor a bit lower. Don't blame the boat.
Ouch,talk about jumping in with both feet!
Anyway the long shaft motor on mine is as far down as it will go without cutting the transom almost down to the waterline, this may make keeping the boat dry somewhat difficult so I think I will put up with the cavitation!
All Humbers are not the same, I have driven both Attaques and Destroyers extensively with my dive clubs over the years, this problem is specific to the Assault as it is very shallow V.
It is actually supposed to plane on the last few feet, it is flat for this purpose and make for a fairly fast boat in calm conditions. The downside is less than perfect rough water handling and turning capabilities.
The skipping/flat turns are because the hull isn't into the water much and can't really be helped. The cavitation is probably in part caused by the tube extensions holding the stern up in turns and in my boat specifically by the forward mounted console and fuel tank making it fairly bow heavy. However there is not a huge bouyancy reserve at the bow in the Assault anyway so mine may not be any worse than any other. I normally put all the dive kit at the stern so I may not have this problem with the boat loaded but have never tried, I don't throw the boat about loaded with divers and kit!
The Assault runs with the tubes in the water so there is not much scope for leaning over in turns anyway.
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Old 15 April 2007, 19:29   #20
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Quote:
Originally Posted by Mollers View Post
It sounds like those Humbers handle like a skip.
You driven a skip on the water?

BTW, nice to see you back Mollers.
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