Osprey Vipermax 7.00 issues

[Downhilldai]

Originally Posted by gotchiguy

If you take a tape measure to yours you will find it is at least 720cm probably more, this is of course includingthe tube overhang, ofcourse te 6.5 is the same: it is actually 6.7m if not more.

Mollers' old 6.5 Vipermax measured 6.5m and my 5.8 Vipermax measures 5.8m

[Vipermax]

Originally Posted by Downhilldai

Mollers' old 6.5 Vipermax measured 6.5m and my 5.8 Vipermax measures 5.8m

Mine has been sold as an Osprey vipermax 6.99 certainly because the importer did not want to pay the french tax for boat over 7meters.

But I do not know its real length.

[martini]

Originally Posted by Vipermax

yes the envirude 250 like the mercury 250xs develops around 275hp at the propeller. They come from the "racing" department.

I thought the HO was just stroked by a fraction of an inch giving a bit more torque

[Erin]

Originally Posted by Downhilldai

Mollers' old 6.5 Vipermax measured 6.5m and my 5.8 Vipermax measures 5.8m

Well I've just nipped outside and put the tape measure to mine. Tip to tail it is just shy of 6.8m. I will remeasure tomorrow in the daylight to confirm, but it's certainly over 6.7m

Originally Posted by martini

I thought the HO was just stroked by a fraction of an inch giving a bit more torque

I was also told that they do give out more power than the decals say, but I've never seen it written anywhere. Anyway, as we know torque is sometimes more important than Hp alone. It may all be a clever marketing spiel.

[Vipermax]

Originally Posted by martini

I thought the HO was just stroked by a fraction of an inch giving a bit more torque

Yes but also have a specific injection cartography which allows better reponse more torque and more power in high revs.

[martini]

Originally Posted by Erin

Well I've just nipped outside and put the tape measure to mine. Tip to tail it is just shy of 6.8m. I will remeasure tomorrow in the daylight to confirm, but it's certainly over 6.7m

What's it supposed to be?

[Downhilldai]

Originally Posted by Erin

Well I've just nipped outside and put the tape measure to mine. Tip to tail it is just shy of 6.8m. I will remeasure tomorrow in the daylight to confirm, but it's certainly over 6.7m

Eurocraft seem to have been a bit more generous with the toobs on later boats, than when Mollers' old boat was done back in '99ish (by Olmec, I think )

[Mollers]

Originally Posted by martini

I thought the HO was just stroked by a fraction of an inch giving a bit more torque

More mapping than stroking I think you'll find.

[martini]

Originally Posted by Mollers

More mapping than stroking I think you'll find.

Is your VM really '99? I assumed it was only a couple or 3 years old, credit to you if it is

[Erin]

Originally Posted by martini

Is your VM really '99? I assumed it was only a couple or 3 years old, credit to you if it is

I think he's referring to his old 6.5, not his current 7.0. Mine was bought under the guise of 6.5.

[martini]

Originally Posted by Erin

I think he's referring to his old 6.5, not his current 7.0. Mine was bought under the guise of 6.5.

Ah ok. Bring back feet and inches I say. Actual feet and inches.

[Mollers]

Originally Posted by martini

Is your VM really '99? I assumed it was only a couple or 3 years old, credit to you if it is

The old one ya' numpty.

The current is an '08.

[Mollers]

Originally Posted by Downhilldai

Mollers' old boat was done back in '99ish (by Olmec, I think )

Henshaw I fawt, but dunno for sure.

[martini]

Originally Posted by Mollers

The old one ya' numpty.

The current is an '08.

Osprey's are like chinese, they all look the same to me

[gotchiguy]

Originally Posted by martini

I thought the HO was just stroked by a fraction of an inch giving a bit more torque

Well to be technical... to turn the 150 into the 150HO is just a map. The 200 to 200HO is a completely different engine, the 200 is 60deg small block and the 200ho is big block 90deg. The 200ho produces 217hp but it is not a racing engine, rather a version of the 200 designed for heavier boats. The 225ho is just a map and a different gearcase, currently the L2 which has low water pickups for those who run them ridiculously high on bass boats, and the 250ho is a 300hp with the racing L2 gearcase and a slight detune. The certification for outboards means they can be +/- 20% of rated hp, and the 250ho is generally regarded as having over 270hp at the prop shaft. Bear in mind however that all HOs are designed for the Yank bass boats and the gearcases are not designed for offshore boats like ours. This is the same for all the Mercury XSs and ProXS, but the Evinrude gearcases are regarded as their weakest point in the racing scene compared to the mercs, some have even bolted on an OMC V8 gearcase to compensate.

Originally Posted by Downhilldai

Mollers' old 6.5 Vipermax measured 6.5m and my 5.8 Vipermax measures 5.8m

Really!? You're saying that from the tip of the D fender at the bow to the rearmost point of the Opti is 5.8m?

Originally Posted by Erin

Well I've just nipped outside and put the tape measure to mine. Tip to tail it is just shy of 6.8m. I will remeasure tomorrow in the daylight to confirm, but it's certainly over 6.7m

Well... what did I say. I'll check out ours at half term in four weeks, and I'll dig out the measurements of Jigsaw which I recall were significantly over 6.5 like Keiths.

Ok, back to the OP....

Best I've seen on ours is 52 knts with our Viper 22". However Into the Red is not set up for top speed; we have no jack plate and the engine is set quite low for good grip on the water and accelerating, not top speed. Also the prop is designed for cruising economy, not for top speed, a 23" Raker would probably add a knot or two.

Back to my point... I have seen 52knts with full kit but very little fuel - 60litres or less- and only me on board. The conditions were ideal: little chop to aerate the hull but sheltered and calm. Above 50 knts the boat began to chine walk like mental, VMs made in the larger mould (6.5-7.8m) have a very deep chine, and this digs deep into the water and so there is lots of travel to one side before the hull rights itself on the tube and bounces to the other side. Thsi si very scary and maybe what your're referring to. Up to about 47knts however she is fantastically stable, and even with a lot of trim up - 70%+- she stays steady, and normal, comfortable progress can be made at 42knts. For us, the most economical speed is 30knts. Our engine is mounted 1cm above the keel I believe, and this will probably be the cause of your problem. It should be lower, sort this before thinking about props, especially with a CR 'box it will prove expensive!

Also, all UK VMs have an offset of 1.5 inches.. hang on that is about 3cm! Ignore me

Originally Posted by martini

Osprey's are like chinese, they all look the same to me

Gotchimum is in strong disagreement with that

[Mollers]

Originally Posted by martini

Osprey's are like chinese, they all look the same to me

You reckon'?

[Mollers]

[QUOTE=gotchiguy;383607] Well to be technical.............



Man!! You need to get a girlfriend.

[gotchiguy]

Originally Posted by Mollers

Well to be technical.............



Man!! You need to get a girlfriend.

[Vipermax]

Originally Posted by gotchiguy

Well to be technical... to turn the 150 into the 150HO is just a map. The 200 to 200HO is a completely different engine, the 200 is 60deg small block and the 200ho is big block 90deg. The 200ho produces 217hp but it is not a racing engine, rather a version of the 200 designed for heavier boats. The 225ho is just a map and a different gearcase, currently the L2 which has low water pickups for those who run them ridiculously high on bass boats, and the 250ho is a 300hp with the racing L2 gearcase and a slight detune. The certification for outboards means they can be +/- 20% of rated hp, and the 250ho is generally regarded as having over 270hp at the prop shaft. Bear in mind however that all HOs are designed for the Yank bass boats and the gearcases are not designed for offshore boats like ours. This is the same for all the Mercury XSs and ProXS, but the Evinrude gearcases are regarded as their weakest point in the racing scene compared to the mercs, some have even bolted on an OMC V8 gearcase to compensate.

Really!? You're saying that from the tip of the D fender at the bow to the rearmost point of the Opti is 5.8m?

Well... what did I say. I'll check out ours at half term in four weeks, and I'll dig out the measurements of Jigsaw which I recall were significantly over 6.5 like Keiths.

Ok, back to the OP....

Best I've seen on ours is 52 knts with our Viper 22". However Into the Red is not set up for top speed; we have no jack plate and the engine is set quite low for good grip on the water and accelerating, not top speed. Also the prop is designed for cruising economy, not for top speed, a 23" Raker would probably add a knot or two.

Back to my point... I have seen 52knts with full kit but very little fuel - 60litres or less- and only me on board. The conditions were ideal: little chop to aerate the hull but sheltered and calm. Above 50 knts the boat began to chine walk like mental, VMs made in the larger mould (6.5-7.8m) have a very deep chine, and this digs deep into the water and so there is lots of travel to one side before the hull rights itself on the tube and bounces to the other side. Thsi si very scary and maybe what your're referring to. Up to about 47knts however she is fantastically stable, and even with a lot of trim up - 70%+- she stays steady, and normal, comfortable progress can be made at 42knts. For us, the most economical speed is 30knts. Our engine is mounted 1cm above the keel I believe, and this will probably be the cause of your problem. It should be lower, sort this before thinking about props, especially with a CR 'box it will prove expensive!

Also, all UK VMs have an offset of 1.5 inches.. hang on that is about 3cm! Ignore me

Gotchimum is in strong disagreement with that

The main problem is that if I lower the engine to much, the steering system will it the transom and I may damage the hydraulic cables....

I thinkk I can lower it by 2cm but much more.

[martini]

Originally Posted by Mollers

You reckon'?

Originally Posted by Mollers

!! You need to get a girlfriend.

Careful, I can hear the bilges calling you