On Sun, 26 Jun 2005 10:54:03 +0200, Ronald Toet
wrote:

Hi All,

I own a 3 meter Hypalon (rubber) boat, on which a '76 Johnson seahorse
6hp is mounted.

Whem i'm the only one in the boat, and I accelerate, the front of the
boat rises very high, and no speed is gained. When I move myself to
the front and accelerate, The nose rises, lowers, speed is gained, and
the boat is planing. As soon as I move myself to the back, the nose
rises, and I must to be carefull not to take off

When there are two people in the boat, the nose wants to rise, but the
engine lacks the power to overcome the drag created by the extra
weight of my passenger.

My outboard is in (nearly) mint condition, and the enginepart is not
definately not worn out. I had it recently checked.

I now wonder: would a modern 4 stroke 6hp do the trick for two people
in the boat? I think that "my" 6hp is measured on the cranckshaft,
wheras (for example) a modern mercury 6hp is measured at the prop. I
also think that modern engines just perform better. Am I right?

I do know that for example a 15 hp engine would do the trick easily,
but that is not an option, for I deflate the boat after every trip,
and I need to take the outboard on and off whilst the boat is in the
water. Since i'm not the incredible Hulk, a max weight of about 30kg
seems enough for me

Please advice!!

Thanks,

Ronald

For the six horse you have, you need to adjust the engine for the boat
- there should be adjustment bracket on the motor to adjust for the
nose high condition.

As to the 6 horse 4 stroke, six horse power is six horsepower.

You might want to compromise and try a 9/10 hp, but I doubt that four
stroke is going to help any at all.

You could change props, but I'm not aware of higher performance props
for this size engine - doesn't mean they don't exist.

For transport, you would be much better off with a two stroke than a
four stroke for a variety of reasons.