A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.

Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.

Try putting 100 pounds of weight at the bow and see if that helps.

On Sun, 26 Jul 2009 21:45:54 -0400, J i m
wrote:

Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.

Try putting 100 pounds of weight at the bow and see if that helps.

We did - he's lighter than I am, but we both sat on the front deck -
didn't help.

"J i m" wrote in message
...
Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.

Try putting 100 pounds of weight at the bow and see if that helps.


I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom. All
the porposing and other squirrely handling symptoms disappeared.

Eisboch

On Jul 26, 9:00*pm, "Eisboch" wrote:
"J i m" wrote in ...



Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. *He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. *No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? *I'll admit it - I'm stumped.

Try putting 100 pounds of weight at the bow and see if that helps.

I had a Robalo that handled like that. *No matter how I trimmed it, it
porpised and chine walked in turns. *I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom. *All
the porposing and other squirrely handling symptoms disappeared.

Eisboch

Not an expert in such, but I was going to say . I think the guy needs
a jack plate.

On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch"
wrote:


"J i m" wrote in message
...
Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.

Try putting 100 pounds of weight at the bow and see if that helps.

I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom. All
the porposing and other squirrely handling symptoms disappeared.

Yeah - that was a thought. My own experience with jack plates would
seem to indicate that it would help more than hurt.

And as it happens, I have a mechanical jack plate sitting in the
garage.

"Wizard of Woodstock" wrote in message
...

On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch"
wrote:

I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom.
All
the porposing and other squirrely handling symptoms disappeared.

Yeah - that was a thought. My own experience with jack plates would
seem to indicate that it would help more than hurt.

And as it happens, I have a mechanical jack plate sitting in the
garage.


In my case, a jack plate wasn't required. The bolts holding the engine on
the transom were removed with the engine strapped to a fork truck. It was
either lowered or raised (can't remember which) by one mounting hole and
reattached. It made a huge difference. The chine walking was scary on
that boat when making turns at high speeds and the porposing was obviously
annoying. The motor height adjustment completely eliminated both. It
didn't take much.

Eisboch

On Mon, 27 Jul 2009 05:48:00 -0400, "Eisboch"
wrote:


"Wizard of Woodstock" wrote in message
.. .

On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch"
wrote:

I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom.
All
the porposing and other squirrely handling symptoms disappeared.

Yeah - that was a thought. My own experience with jack plates would
seem to indicate that it would help more than hurt.

And as it happens, I have a mechanical jack plate sitting in the
garage.

In my case, a jack plate wasn't required. The bolts holding the engine on
the transom were removed with the engine strapped to a fork truck. It was
either lowered or raised (can't remember which) by one mounting hole and
reattached. It made a huge difference. The chine walking was scary on
that boat when making turns at high speeds and the porposing was obviously
annoying. The motor height adjustment completely eliminated both. It
didn't take much.

I'll have to take a look at where it's mounted on the engine bracket.
It's a short shaft, so I imagine there isn't a lot of room to play
with.

Eisboch wrote:
"J i m" wrote in message
...
Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.
Try putting 100 pounds of weight at the bow and see if that helps.


I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work who
took it and adjusted the mounting height of the engine on the transom. All
the porposing and other squirrely handling symptoms disappeared.

Eisboch



That was my first thought. You could also try a small jack plate.
Here's an example:

http://www.bobsmachine.com/

Email them - they are very helpful. They told me I wouldn't gain much
on my bass boat (alum w/90HP) so they seem to be honest people and they
have been around a long time.

D wrote:
Eisboch wrote:
"J i m" wrote in message
...
Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride
with him because he couldn't get his boat to plane right.

We met up at Webster Lake and took it for a ride after checking
everything over - everything seemed to be working, nothing out of
sorts with the hull.

Got on the water and it's the oddest thing - no matter what trim
position, the boat would porpise (pitch) at speed. Vary the speed and
you'd get a yawing action - trim made no difference. No roll to speak
of.

All the bolts are tight, properly torgued, the prop is symmetrical,
the skeg on the outboard is straight, keel is straight - no obvious
repairs.

Any ideas? I'll admit it - I'm stumped.
Try putting 100 pounds of weight at the bow and see if that helps.


I had a Robalo that handled like that. No matter how I trimmed it, it
porpised and chine walked in turns. I mentioned it to a guy at work
who took it and adjusted the mounting height of the engine on the
transom. All the porposing and other squirrely handling symptoms
disappeared.

Eisboch


That was my first thought. You could also try a small jack plate.
Here's an example:

http://www.bobsmachine.com/

Email them - they are very helpful. They told me I wouldn't gain much
on my bass boat (alum w/90HP) so they seem to be honest people and they
have been around a long time.

It could also be a result of weight distribution.