How fast can you go before "wobbling"?

joakimhansson · 19 June 2006, 11:12

In size between 23-29 foot. I heard that the swedish rib, ribunlimited 700 has big problem over 40-42 knot. Ok, the boat is very light but...who want?

fast fred · 19 June 2006, 12:14

Drive through it, see whats on the other side, thinkin "wobbling" means chinewalk , as your skill grows you will automaticly compansate for the chinewalk, some setup addjustment may help as well.

Nicksweden · 19 June 2006, 12:19

Mine doesn't wobble!

I have a RIB Unlimited 700 with a Yamaha 115 and have almost never experienced "wobble" maybe a tendency with just myself onboard low fuel load and outboard trimmed out a long way.........
With a clean bottom I've seen 47 Knots on the GPS.

My old Avon Searider with a mercury 75 I had in Plymouth many years ago used to do real "tank slappers"

Alice · 19 June 2006, 12:21

In my view 'chinewalk' is a badly set-up boat. I wouldn't want to power through it, i'd not want the boat in the first place. I drove a Nouvorania 5.5 with a 90 Honda on it that 'walked' all over the place it was not nice.

fast fred · 19 June 2006, 12:40

"In my view 'chinewalk' is a badly set-up boat."
not so, some setup can contribute to the walk, but most of it is Driver Skill.
seen it many times, the hull be slapin left and right like a door flapin in the wind, a skilled driver reach over from the passenger side with one hand and it disapears.

joakimhansson · 19 June 2006, 12:41

Nick, Is the unlimited good even in sharp corners?

Nicksweden · 19 June 2006, 13:00

Excellent in fast corners, I had the outboard mounted very high up a couple of years ago, for higher top speed, which has the effect of loosing some grip in sharp turns. With the outboard mounted in the standard poistion as I have now there is no problem.
By the way, I have changed from the standard 3 bladed Yamaha S/S propeller
to a four bladed S/S prop this gives better grip, useful when it's a bit choppy.

Rogue Wave · 19 June 2006, 13:49

Funnily enuff I used to get 42 knots GPS out of my Searider 4.7 and that chined badly at around 35 and it was down to my understanding of the bots handling,

but I was driving a Ribtec at 44 knots the other day and I did not want to take the chining any further but it did have an Aux on the transom.

Jono · 19 June 2006, 14:18

How fast can you go before "wobbling"? .......about 2kph after a Stella or four......

joakimhansson · 19 June 2006, 16:45

jono

Sorry for my lovely english!

Pete7 · 19 June 2006, 16:58

Quote:

Originally Posted by fast fred

not so, some setup can contribute to the walk, but most of it is Driver Skill. seen it many times,

Hmm, you sure? I was also out with Stu doing 44 knots and the rib was chine walking. I had a good look at what he was doing and couldn't see anything wrong concerning trim or balance of the boat. I put it down to the boat set up (short fat boat with a big opti on the back).

Pete

Matt · 19 June 2006, 17:04

A poorly setup boat will be inclined to do it. A well setup boat "may" be inclined to do it, and then driver skill is needed to control it. Hanging on for dear life, or nailing the throttle, is not the right answer.

simonfuller · 19 June 2006, 17:36

Quote:

Originally Posted by Rogue Wave

Funnily enuff I used to get 42 knots GPS out of my Searider 4.7 and that chined badly at around 35 and it was down to my understanding of the bots handling,

Rogue Wave, out of shear curiousity, what make/hp/model of outboard did you acheive those sorts of speeds on your old Searider 4.7 with? I currently have a Honda 45hp with which I can only achieve about 22-23 knots at the moment.

Thanks Simon

PeterR · 19 June 2006, 18:30

Quote:

Originally Posted by MadMat

A poorly setup boat will be inclined to do it. A well setup boat "may" be inclined to do it, and then driver skill is needed to control it. Hanging on for dear life, or nailing the throttle, is not the right answer.

I agree with this and can speak about set up as many boats bought have finally realised every set up effects a boat differently.Will post more but must give in to the wife saying teas ready why do you start ribnet when i,m dishing up. sound familiar anyone

ribit · 19 June 2006, 19:41

I had this chine walk dilemer when my rib was first set up, i found 10mph very annoying and if I wanted to go faster i realised a lot of set up options were going to take place, but then I knew are so many variables from weight of engine to offset, prop type inc pith & diamiter, weight distributon within the boat both fore and aft, as well as port and starbord. Even two simular boats can have varing characteristics, and as regards looking for that last mph is it really that nesscesary in a pleasure Rib mostly used at part throttle, as opposed to a rib set up for racing and looking for that last 0.1 of mph.

ribit · 19 June 2006, 20:22

MMMMM computer crashed, when my last post was just a rough draft, with phonetic spelling, and it posted it!!!!! and now will not let me edit it, Bugger!!!!always do a very rough draft and then decide on how I will post something