Interesting problem...
 

D wrote:
NotNow wrote:
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.

If you are replying to me, I didn't email them specifically about speed.
I was (an still am) considering a hydraulic plate for shallow water
fishing. I asked about performance improvement and they were very
honest in their opinion.

Dan, I lost the post, so I was replying in general to the original
problem that Tom was describing. Sorry for the confusion. My bass boat
has a jack plate just for the reason you stated, I like to get up and
personal with the fishys some times!

Interesting problem...
 

NotNow wrote:
D wrote:
NotNow wrote:
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.

If you are replying to me, I didn't email them specifically about
speed. I was (an still am) considering a hydraulic plate for shallow
water fishing. I asked about performance improvement and they were
very honest in their opinion.

Dan, I lost the post, so I was replying in general to the original
problem that Tom was describing. Sorry for the confusion. My bass boat
has a jack plate just for the reason you stated, I like to get up and
personal with the fishys some times!

Hydraulic or manual? Can you post a pic of the business end over there
---?

Interesting problem...
 

D wrote:
NotNow wrote:
D wrote:
NotNow wrote:
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.

If you are replying to me, I didn't email them specifically about
speed. I was (an still am) considering a hydraulic plate for shallow
water fishing. I asked about performance improvement and they were
very honest in their opinion.

Dan, I lost the post, so I was replying in general to the original
problem that Tom was describing. Sorry for the confusion. My bass boat
has a jack plate just for the reason you stated, I like to get up and
personal with the fishys some times!

Hydraulic or manual? Can you post a pic of the business end over there
---?

Sure, I'll try to take a pic tonight....if I remember! Mine's hydraulic,
runs just like a trim motor.

Interesting problem...
 

NotNow wrote:

If you are replying to me, I didn't email them specifically about
speed. I was (an still am) considering a hydraulic plate for
shallow water fishing. I asked about performance improvement and
they were very honest in their opinion.

Dan, I lost the post, so I was replying in general to the original
problem that Tom was describing. Sorry for the confusion. My bass
boat has a jack plate just for the reason you stated, I like to get
up and personal with the fishys some times!

Hydraulic or manual? Can you post a pic of the business end over
there ---?

Sure, I'll try to take a pic tonight....if I remember! Mine's hydraulic,
runs just like a trim motor.

I'll keep an eye out for it!

Interesting problem...
 

D wrote:
NotNow wrote:

If you are replying to me, I didn't email them specifically about
speed. I was (an still am) considering a hydraulic plate for
shallow water fishing. I asked about performance improvement and
they were very honest in their opinion.

Dan, I lost the post, so I was replying in general to the original
problem that Tom was describing. Sorry for the confusion. My bass
boat has a jack plate just for the reason you stated, I like to get
up and personal with the fishys some times!

Hydraulic or manual? Can you post a pic of the business end over
there ---?

Sure, I'll try to take a pic tonight....if I remember! Mine's
hydraulic, runs just like a trim motor.

I'll keep an eye out for it!

****, forgot all about it, sorry! I'll try to get it to you before I
leave for Chattanooga for a little R&R! I'll tell you, people who
haven't spent time in Chattanooga in the last few years don't know what
they are missing. One of my favorite smaller cities in the U.S.