Trim / Chine walking / Engine height - Page 2

Pete7 · 18 December 2003, 21:50

Yep possible, but 220 l of fuel up the front end is a huge weight. Mine had 130 l set 10" back from standard. Off to denmark then and compare with Rene. sure its chine walk rather than porpoising or bow steering ?

Pete

Daniel · 18 December 2003, 23:33

Quote:

Originally posted by Pete7
sure its chine walk rather than porpoising or bow steering ?

No, not at all, i'm far from an expert on this subject, infact i expect it is one of the last two options.

The hull is quite a lot longer than 5m, there is nothing more than 10cm overhang and the bow and not a vast amount of tube extension from the stern - that is one of the reasons i was so atracted to this boat, its relatively large waterline length.

Can't be sure there is no water in there, she's been afloat for a couple of weeks, coming out saturday. I'll play with weight distribution - i must be down to 120-150li fuel now aswell.

Thanks for all the suggestions so far - i still hope its just some air in the steering system combined with to much bow weight when only 2 on-board (as there has been all this week).

Daniel · 18 December 2003, 23:34

Quote:

Originally posted by Pete7
Off to denmark then and compare with Rene.

I think Rene is towing over for the 3rd RIBnet meet, or have i mixed him up with someone else? Could be handy.

Rene · 19 December 2003, 09:48

I'm going to bee there, noting can stop me this time.

Deposit payed, and registration sent to Kevin.

About the boat......

You never know. I might bring the Osprey or I might bring, well something else

If I can get my frind to take his own car I might bring both.

But I sure will be there (Afraid to be called wuss, if I miss this one)

Rene

Pete7 · 19 December 2003, 11:08

Oh yes, buying something bigger then Rene, go on do tell!

Why not come by water and meet Daniel half way ?

Pete

Rene · 19 December 2003, 12:18

hmmm....

I don't know what the boat will look like yet. It's a new mould, 1.st customer boat out off it.

I got a VERY good price on it, but havn't seen it yet. I have been talking to the builder for the past 8 month, and we have made a lot of changes from the first design.

It's 8 meters, and 2.8 meters wide, concept a bit like balistic 7.8

I promise to post pictures the day of arrivel. I have been promised delivery i feb. (cross my fingers, they have said this before)

Engine ....
looking at Yamaha Vmax (again), or Suzuki DF250 new 4 stroke).

I really like the 4 stroke idea, but have to consider pricing.

It should be finish in good time before the meeting, but sailing accross .... Think I will take the feery, to save some miles on the road.
My wife and I arrive in Harwich Friday at 11.00 (morning), and then maybe meet up with Daniel to drive to South Hampton

Rene

Rene · 19 December 2003, 12:21

My Osprey starts to Chine walk around 40 - 45 knots, at 35 it a walk in the park. I can get 52 knots out of her, but then you need to hang on tight.

130 Liters of fuel, and not a lot up front. The boat have a very nice balance.

After engine change it tends to fall on the right side when wave jumping.

Rene

Daniel · 01 January 2004, 15:57

To bring this thread up-to-date the solution was simple - move the anchor!

Various sea states and amounts of fuel have now been tried and the problem is gone all together. Even with a full tank of fuel and only one passenger in the rear, with the anchor under the rear seat there were no problems even making 40knts in a moderate sea.

The ride is much drier aswell - more like i expected it to be.

Thanks to all who gave advise.

The steering had self-bled it's self and just needed topping up slightly.

It was like a mill-pond last time i went out and with about 150li fuel 2-up try as i did i could note get more than 46knts (53mph) @ 5200rpm. The plus point is the boat was very stable at this speed, could have a chat with my friend!

Rene

I'm interested in what prop you are using at what sort of load (fuel/people) you can get over 50 knts...

Also, i had not thought about you arriving into Harwich, that's a lot less convinent to meet-up that Dover (makes sence now i think about it that you are not coming into DOver) but we can speak about that nearer the time. There is likely to be some pople coming from the Essex way that may travel in convey with you.

Daniel · 02 January 2004, 12:07

Quote:

Originally posted by jwalker
2" offset is a lot too for a 6mtr boat. Your thrust line is way to the side.

It's 3" to stbd infact, i've just measured it. My outboard man reckons that is about right for 150hp engine.

The set-up is very good now i'm removed the weight from the bow. I'll let you know what Mr Osprey says when i call him.

Richard B · 02 January 2004, 12:09

Just a thought - I wonder if Rene has got that dual-prop version of the 150 V-Max?

jwalker · 02 January 2004, 12:21

If I understand you correctly, you had a very unstable boat which was very wet. You only moved the anchor away from the bow and now it does 46ktns and it is perfectly stable.

So, if, at speed, a person moves to the bow, the whole thing goes pear shaped?

Something doesn't ring true.

Daniel · 02 January 2004, 12:27

Two completly different situations and conditions Mr Walker.

Unstable wet boat in moderate conditions, move anchor acceptable and expected less wet ride and drivable 35-40 knts in moderate sea. I'd like to see someone stay in the bow in such conditions.

WOT dead calm 46knts, stable, comfortable, inspires confidence.

jwalker · 02 January 2004, 12:48

Ah, I see.

Rene · 02 January 2004, 13:41

Hi

My engine is not the dual prop.

I don't know if the engine is made this way or if the previous owner changede this.

But I have a 5 blade Mercruiser steel prop, that I use fore everything. Diving, cruising and Water skiing, for water skiing it's a bit over powered, You need to grap real god onto the line, or bee very gently on the throttle.

I don't remember the size, and the boat is in winter storage at the moment, so it's not close by. But I will have a look the next time I'm going to see the boat.

Regards
Rene

Pete7 · 02 January 2004, 23:53

Quote:

My outboard man reckons that is about right for 150hp engine.

Daniel, whilst I am no expert, I hae always been told 3/4" for every 100 hp. I agree with JW it does seem alot.

Out of interest I have just moved my 150 v6 Mariner (Carb version) back to the centre line of my Ribtec. No obvious differences and no vices from mounting the engine on the centre line. (The orginal offset was about 2" but the size of the first engine unknown.) If there are now no handling vices then suggest you leave it alone rather than drill 4 extra holes int he transom.

The Ospreys have a great hull shape and whilst not being as fast as a dart like Scorpion I know which one I would prefer to be sat on in a storm.

By the way the viper hull can be traced back to Fletcher, the makers of all those speed boat things.

Pete

Daniel · 03 January 2004, 10:39

Thanks for the info Pete. My first boat was a fletcher. DM and I had quite a chat about my osprey and he reckons it had a 200 on it origionaly which might explain the large offset. Interesting that you have found moving back to the middle not to be such a bad thing.

I keep meaning to 'fone Osprey, which i must do this week.

The problem (also) with moving around on an Osprey transom is the 'whale tail' anti-poop top section to the transom (pic to follow) has a cut-out in it to stop pooping.