On Fri, 25 Apr 2008 22:30:45 -0700 (PDT), Jay
wrote:

If a person strapped TWO of those Suzuki 2.5hp outboards (only 29 lbs.
each) to the back of the boat, one on each side, what would be the
effect? 5hp? Double the speed? Double the noise? Nothing? Just
curious...

If you want to go significantly faster you need enough power to get on
plane. That will take 10 to 20 hp for your boat depending on how
heavily loaded it is. The complexity of trying to steer two outboards
is reason enough not to do it but there are other reasons also like
increased drag, fuel consumption and maintenance.

Most dual outboard installations are done for redundancy on offshore
boats or where the boat is heavy enough that no single motor provides
enough power.

On Sat, 26 Apr 2008 05:47:52 -0700 (PDT), Jay
wrote:

"I see a lot of boats here with a couple of 250 h.p.
engines strapped on the tail." Curious why they don't just strap ONE
500 hp motor on the back instead of two 250s if there's not an
advantage.
It's simple. 250 is as big as they make them, you can't get a 500HP
engine.

Casady

On Sat, 26 Apr 2008 08:54:06 -0400, Wayne.B
wrote:

The complexity of trying to steer two outboards
is reason enough not to do it

Its simple,not complex. A tie bar between the tillers and you have it.

Casady

Jay wrote:

If a person strapped TWO of those Suzuki 2.5hp outboards (only 29 lbs.
each) to the back of the boat, one on each side, what would be the
effect? 5hp? Double the speed? Double the noise? Nothing? Just
curious...


Well Jay, I can speak from experience, here. When my son was about 15
he wanted to know what happens if we put both the 2HP Evenrude, ant the
2.2. Merc on the back of the punt; I figure what the hell, let's try it.

You go a bit faster, maybe 25%, (which jibes with other posters
statements), and use twice the gas, but have four times the fun trying
to keep the thing going straight! :-)

Cheers
Marty

On Sat, 26 Apr 2008 05:47:52 -0700 (PDT), Jay
wrote:

On Apr 26, 5:15*am, Bruce in Bangkok wrote:
I keep telling the guy, "call Roger". He don;t listen.
Bruce-in-Bangkok


Oh, he DO listen but he's just gathering alternate info from other
sources. I'll get around to the head guru Roger soon.

What's taking up my time is trying to figure why those power maniacs
around you are strapping two of the big blasters to their boats. As
you stated, "I see a lot of boats here with a couple of 250 h.p.
engines strapped on the tail." Curious why they don't just strap ONE
500 hp motor on the back instead of two 250s if there's not an
advantage. Curious....

-Jay
(who
listens.......................................... ............occasionally)




I don't have a clue. I'm the buy that thinks a 5 HP engine is a BIG
motor.

I guess because it is cool. "Man, I've got the biggest engines in
town", or because they listen to Cassady and think that two engines
make them go twice as fast.

Hell, I don't know.


Bruce-in-Bangkok
(correct email address for reply)

On Sat, 26 Apr 2008 17:36:24 -0400, wrote:

On Sat, 26 Apr 2008 13:49:10 GMT, (Richard Casady)
wrote:

On Sat, 26 Apr 2008 08:54:06 -0400, Wayne.B
wrote:

The complexity of trying to steer two outboards
is reason enough not to do it

Its simple,not complex. A tie bar between the tillers and you have it.

Casady

Now try and get them to always run at the same speed. And lets not forget trying
to suddenly throw them both in neutral. And, on these little motors, reverse is
swinging them around backwards. There is no PRACTICAL way to use two of these
little motors in tandem.

Hot Damn, man. Who wants to go backward? If you wanted to do that
you'd stick the motors on the bow of the boat, wouldn't ya :-)


Bruce-in-Bangkok
(correct email address for reply)

"Bruce in Bangkok" wrote in message
...
Hell, I don't know.


For once you speak the truth! Keep up the good work, Bruce.

Wilbur Hubbard

On Sat, 26 Apr 2008 09:46:45 -0400, "Roger Long"
wrote:

"cavelamb himself" wrote

You might "Ping" Roger
as to why doubling the Horse Power doesn't necessarily mean double the
speed. Has to do with all kind of hull forms and hydrodynamics and too
much of it will make your eyes cross.

As has been pointed out here, I have no *formal* training in naval
architecture and am therefore unqualified to comment.

I do know that it is an immutable law of the universe however and always
obey it even when I don't see any physics cops in my rearview mirror.

BTW good bio article about Ray Hunt in the latest "Yachting". Another guy
with no formal training in the field.


I believe it is called empirical learning. I've seen half models
carved a hundred years ago that wouldn't bring any shame on a "modern"
designer.

Bruce-in-Bangkok
(correct email address for reply)

On Sat, 26 Apr 2008 09:46:45 -0400, "Roger Long"
wrote:

"cavelamb himself" wrote

You might "Ping" Roger
as to why doubling the Horse Power doesn't necessarily mean double the
speed. Has to do with all kind of hull forms and hydrodynamics and too
much of it will make your eyes cross.

As has been pointed out here, I have no *formal* training in naval
architecture and am therefore unqualified to comment.

I do know that it is an immutable law of the universe however and always
obey it even when I don't see any physics cops in my rearview mirror.

BTW good bio article about Ray Hunt in the latest "Yachting". Another guy
with no formal training in the field.


I believe it is called empirical learning. I've seen half models
carved a hundred years ago that wouldn't bring any shame on a "modern"
designer.

Bruce-in-Bangkok
(correct email address for reply)

On Apr 26, 3:47*pm, Marty wrote: You go a bit
faster, maybe 25%, (which jibes with other posters statements), and
use twice the gas, but have four times the fun trying to keep the
thing going straight! :-)
Cheers, Marty

Now THAT sounds like a formula for an afternoon of fun boating!
But as far as keeping it going straight, wouldn't an outrigger setup
with yet two more 2.5 hp throbbers mounted one on each side like jet
engines hanging off the wing of an airplane make it "steady as she
goes?" I guess if one is gonna go to all that trouble, a better
thought might be just one 9.8 hp hanging on the tail.

But I bet the other setup would get a lot of attention and perhaps
even earn one the title of "coolest boater dude on the lake" or
"nutcase boater of the year."

-Jay