Going Faster than 8mph

[Johnacuda]

She is still in the water. I will take a video and post it. I was going with the current and wind, but the tidewas coming in. knot meter was reading 20.5, and gps on the phone was reading 25mph. I think that worked to about a 2 kt. discrepency that I put down to current. Does anyone know what measurements or markings I should look for on my prop?

[Carioca]

I have a Yammy 50 hp with a 12 x 3 x 9 pitch prop.
I have tried 4 other pitches ,and the 9 with big dog ears gets me to 17/18 mph at wot.
Empty ballast.

[K9Kampers]

... opinion withdrawn

[Catigale]

...need for speed....

[Tomfoolery]

Personally, I think a 15 or 20hp motor would be more than adequate, but the kids will soon be of an age where they want the thrills of being towed on a tube, and I can't see the 50hp will give them much of a buzz....

Oh, I don't know - you'd be surprised how much fun you can have with a 50 hp. This kid's not exactly a lightweight, either.

He wants me to get a 90 hp now. He never wanted to go on the keelboat we had before this, and would go below decks and take a nap while sailing. Now, it's 'when can we go out again?', which is exactly the reason (a very big one, at least) that I sold the other and got this particular boat.

[Catigale]

[mastreb]

So last weekend we went out, I dropped the hammer to impress some friends, and...

8 knots.

Turns out it was bottom growth from being in a Marina for three months without anti-fouling bottom paint. I've got an astonishing amount of algea, moss, and sea grass growing on the bottom fo my boat now. It's going to be a PITA to clean off.

So add this to the Cat's list of reasons why a boat may be slow.

The Port of San Diego will pay for your bottom paint if you do it non-copper, so perhaps I should take them up on it. Although I have to wonder if that stuff does any good. After all, if it's non-toxic, how is it killing algae?

[RobertB]

Check out Practical Sailor magazine - they do alot of long term paint comparisons and will likely have the information you are looking for. They have an online deal where you can search all back issues.

[dlandersson]

There are "slick" bottom paints -recommended for a MAC 26 X/M

So last weekend we went out, I dropped the hammer to impress some friends, and...

8 knots.

Turns out it was bottom growth from being in a Marina for three months without anti-fouling bottom paint. I've got an astonishing amount of algea, moss, and sea grass growing on the bottom fo my boat now. It's going to be a PITA to clean off.

So add this to the Cat's list of reasons why a boat may be slow.

The Port of San Diego will pay for your bottom paint if you do it non-copper, so perhaps I should take them up on it. Although I have to wonder if that stuff does any good. After all, if it's non-toxic, how is it killing algae?

[DaveB]

Wow! 3 months in salt water without bottom paint , I would have Marine slim and small shells growing in 2 weeks here in SW Florida.
Three Months here you could intertain your guest chucking oysters off the hull.
Dave

So last weekend we went out, I dropped the hammer to impress some friends, and...

8 knots.

Turns out it was bottom growth from being in a Marina for three months without anti-fouling bottom paint. I've got an astonishing amount of algea, moss, and sea grass growing on the bottom fo my boat now. It's going to be a PITA to clean off.

So add this to the Cat's list of reasons why a boat may be slow.

The Port of San Diego will pay for your bottom paint if you do it non-copper, so perhaps I should take them up on it. Although I have to wonder if that stuff does any good. After all, if it's non-toxic, how is it killing algae?

[Russ]

Wow! 3 months in salt water without bottom paint , I would have Marine slim and small shells growing in 2 weeks here in SW Florida.
Three Months here you could intertain your guest chucking oysters off the hull.
Dave

I gotta agree with Dave on this one. How do you get away with no anifoulant in salt water?

In fresh water we have lots of slime. I'm resisting Anti Foulant paint, but losing the argument. In fresh water the slime is coming off, but it's a PITA.

--Russ

[Catigale]

Water in CA is quite cold, unlike FL...

[mastreb]

I gotta agree with Dave on this one. How do you get away with no anifoulant in salt water?

I don't think I've gotten away with anything. This is the first time Luna Sea has been in the water for more than two weeks at a stretch, and I'm pulling it out on Monday, so we'll see the damage then. It's been in since July 16th, so it'll have been three months.

[mallardjusted]

k9: For all the times it's come up here, I've never understood that reasoning for putting a larger motor on a boat than what it's rated for.

Interesting ...... I've looked all over my 26X and I can't find a rating placard anywhere!!!



With a 50 of any manufacturer (that is running ok, and with the right prop, and with ballast water in), you should be getting 10 to 15 knots, no problem.

[K9Kampers]

... opinion withdrawn