Slow Cruising Speed Question
 

I recently did a sea trial on a boat I'm thinking about buying, a 1990
Thompson 288 Adventurer flybridge cruiser with twin 350 mercruiser inboards.
I was disappointed to find that at 3200 RPM, trimmed for max speed, it could
only make 13-14 knots, as indicated by GPS, and at WOT, around 4800 rpm, it
topped out at about 24. This was in glass-smooth protected waters with
little wind. The engines seemed to be running fine, but this seems a rather
slow boat. It's my understanding that much over 3200 rpm the 4bbl carbs
open up and send fuel consumption through the roof. Any thoughts or advice
for this beginner?

Steve

Slow Cruising Speed Question
 

Maybe the thing is just propped way too much. Regardless, unless the owner
can get it performing decently, stay away!

"Steve Helling" wrote in message
...
I recently did a sea trial on a boat I'm thinking about buying, a 1990
Thompson 288 Adventurer flybridge cruiser with twin 350 mercruiser
inboards.
I was disappointed to find that at 3200 RPM, trimmed for max speed, it
could
only make 13-14 knots, as indicated by GPS, and at WOT, around 4800 rpm,
it
topped out at about 24. This was in glass-smooth protected waters with
little wind. The engines seemed to be running fine, but this seems a
rather
slow boat. It's my understanding that much over 3200 rpm the 4bbl carbs
open up and send fuel consumption through the roof. Any thoughts or
advice
for this beginner?

Steve

Slow Cruising Speed Question
 

In article ,
"Steve Helling" wrote:

I recently did a sea trial on a boat I'm thinking about buying, a 1990
Thompson 288 Adventurer flybridge cruiser with twin 350 mercruiser inboards.
I was disappointed to find that at 3200 RPM, trimmed for max speed, it could
only make 13-14 knots, as indicated by GPS, and at WOT, around 4800 rpm, it
topped out at about 24. This was in glass-smooth protected waters with
little wind. The engines seemed to be running fine, but this seems a rather
slow boat. It's my understanding that much over 3200 rpm the 4bbl carbs
open up and send fuel consumption through the roof. Any thoughts or advice
for this beginner?

Steve




When was the bottom last cleaned ?

Something is wrong here... find out what it is.

jay
Thu, Sep 18, 2003


--

Legend insists that as he finished his abject...
Galileo muttered under his breath: "Nevertheless, it does move."

Slow Cruising Speed Question
 

The bottom is clean, and it is kept in dry storage. I don't trust the
tachs, considering the stbd tach reads 4000 when the port tach reads 3200.
They may both be reading high. I'm also considering whether it could be a
prop, engine, or weight issue.



"Go Fig" wrote in message
...
In article ,
"Steve Helling" wrote:

I recently did a sea trial on a boat I'm thinking about buying, a 1990
Thompson 288 Adventurer flybridge cruiser with twin 350 mercruiser
inboards.
I was disappointed to find that at 3200 RPM, trimmed for max speed, it
could
only make 13-14 knots, as indicated by GPS, and at WOT, around 4800 rpm,
it
topped out at about 24. This was in glass-smooth protected waters with
little wind. The engines seemed to be running fine, but this seems a
rather
slow boat. It's my understanding that much over 3200 rpm the 4bbl carbs
open up and send fuel consumption through the roof. Any thoughts or
advice
for this beginner?

Steve




When was the bottom last cleaned ?

Something is wrong here... find out what it is.

jay
Thu, Sep 18, 2003


--

Legend insists that as he finished his abject...
Galileo muttered under his breath: "Nevertheless, it does move."