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Author Topic:   NAUSET with 115-HP
Nausiat posted 08-27-2004 08:16 AM ET (US)   Profile for Nausiat   Send Email to Nausiat  
1968 Nauset, currently with a roller painted hull (no idea why)..

Boat came with a 1969 Merc 80Hp, slightly tired. GPS'd out at 36.5 with a 19" but over revving badly, GPS'd at 35 with a 23 in the right RPM range. Good hole shot either way but nearly impossible to keep from porpusing..

New/used engine is now a 1985 Merc 115Hp inline 6. Top speed on a 19" is 49.5 at 5800rpm, with a 21" it is 48mph at 5300rpm. Hole shot is simply a blast, once boat goes bow high, motor hits its power band and pretty much jumps over the bow wake and planes out. Boat still hard to keep from porpusing at mid 30's but stops that above 40. Chine walk however above 47 is brutal and very hard on the nerves.

Will see next spring what a clean wax gel bottom does compared to roller paint. Will also see if a new steering cable helps limit chine walking. May also play with motor height. 80Hp was raised 1 hole, 115 is currently right down on transom..

Just for those curious!

Greg

bsmotril posted 08-27-2004 08:27 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
One of the things that could cause the porpoising is the motor being mounted to deep into the water. You might try moving it up a bit if possible. Those old tower of power mercs are awesome motors. We used to pull 8 skiers behind an old hydrodyne with a pair of them. BillS
jimh posted 08-27-2004 08:48 AM ET (US)     Profile for jimh  Send Email to jimh     
[Administrative post]
gimcrack225 posted 08-27-2004 09:38 AM ET (US)     Profile for gimcrack225    
Nausiat,
With due respect, perhaps the boat is trying to tell you something. I believe the sea sled/cathedral hull is not designed for that speed. Particularly scary to me is the perception that the hull is both starting to act like a wing and creating lift from the high pressure in the two tunnels. You describe "chine walking" i.e. not enough hull in the water to control the boat. One bump and you're out of there.

My first whaler was a Nauset, what a great boat. I bought it with the original 4 cyl Johnson SeaHorse 85. After seemingly endless posts on ContinuousWave I bought a 3cyl Johnson 70.

Safe boating.
Karl

Bigshot posted 08-27-2004 01:13 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Raise her up to 3rd hole and try that 21" again. She redlines at 5500 or 5600 but can handle 6k no problem from what I hear. If you can't raise her up, get a manual jacklate and go about 4inces up and watch her fly.
Nausiat posted 08-27-2004 08:49 PM ET (US)     Profile for Nausiat  Send Email to Nausiat     
Gimcrack
Know what you're trying to say, not my intention to run her full out and the 40-45 cruise is a very happy speed for the Whaler. None the less, human nature says you have to find out what they'll do, I have owned a number of +50 boats. What I find interesting in the chine walking is a buddies (Eastport) walked something awfull at 48 with a 100 Merc and now doesn't at all with a 115 Yamaha. Haven't looked at mounting height differences.

Bsmotril / Bigshot.
I can't grasp how raising the motor helps with the porpusing, but I have seen that mentioned so many times here I can't deny the probability it will work. Motor has to come off this winter to restore the hull anyway so it will go back on 1, maybe 2 holes up and we'll play from there. Have to get this paint (almost appears to be latex house paint) off before I can truly test any changes though.

Thanks for the replies guys! Talking about the handling of a Whaler to a 'normal' boat owner is totally pointless, they don't understand what I am beginning to learn about these things. Nice to discuss them with people that understand them!

Greg

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