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  #41  
Old 04-28-2010
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Did they replace the prop on the boat??? The Gemini's I've been on do about 6 knots or so at 3000 RPM IIRC.

Loose rigging could account for the poor performance under sail...
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  #42  
Old 04-28-2010
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Is there a way to find someone who is an expert on that Sonic drive leg, and ask them if there is anything mechanical in there that could slip and still be operational?

Hmm....can you turn the prop without turning the engine?
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  #43  
Old 04-28-2010
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The sonic drive leg is a pretty basic beastie... I took one apart last December to re-build it... It is basically just gears, shafts and a universal joint type mechanism. Either it works or it doesn't. If it doesn't, it is because some of the gears are busted or missing teeth.
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  #44  
Old 04-28-2010
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Quote:
Originally Posted by TexasWill View Post
We did sail during the sea trial, but I know there are far to many variables during sailing to be able to tell if we were going any slower than I would have expected. To the best of my knowledge we at about 45 degrees into the wind. The wind was about 9-11 knots, and we were sailing 3-4 knots. Then we tacked switching the wind off the port side (still at 45 degrees) and kept the same speed. Then we motored back.

We did wind the engine up to 3500 RPMs , but she didn't sound like she liked it very much, and it did get us right at 5 knots. This was a very brief period (maybe 20 seconds) the rest of the time it was 3200RPMs and 4.8 knots or 2700RPMs pushing us at about 4 knots.

To be honest, I don't care much if it is a fault with the engine becuase I don't plan to use it much...but if the performance hit was something wrong with the boat that affected the boat likewise under sail, then it would be a major issue.

The boat was never chartered and was capsized by the current owner in the lake she is in now. He said he was used to sailing monohulls and it got away from him. He showed me the $78,000 in reciepts and the post accident survey and eveything seemed on the up and up.

She is a perferct boat for me and my family, and I really want everything to work out. I really want us to find out the issue next tuesday and you all are helping very much.
Chuckles- Correct me if I'm wrong, but should you be able to sail faster that 3-4 kts in 9 -11 kts of wind? I can do better than that in my 37 year old monohull.
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  #45  
Old 04-28-2010
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Something is definitly wrong. The RPMs appear to be right maxing at 3600 no load and 3300 under load. The prop is therefore the correct one or you won't get these readings. So it's not the motor and it's not the prop something else is slowing the boat down. Two knots is significant and the fact that speed through the water and speed over ground are the same means it has something to do with how the boat is going through the water. Something is holding it back. You have ruled out a dirty bottom. The dagger boards will slow you down a bit (someone posted maybe a 1/4 knot) but not 2. The only other variable that I can see is how much wetted surface the boat has. So how does it's freeboard does this Gemini and how does that compare to others?
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Old 04-29-2010
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With this unknown issue affecting the boat, why would you continue to even consider this. There are lots of Gemini's out there, if you really want to buy one why not look for another that hasn't flipped and doesn't have issues like this.

I have a sneaking idea the hull is toast. Why take the chance?
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All,

Thank you very much for you inputs...I have sent the seller and my broker the following e-mail:

"I have reach the difficult decision to withdrawal my bid for "XXXXX" based on her inability to achive the expected cruising speed under power. I do not feel it is my responsibility as a buyer to pay for engine surveyor and mechanics to travel to fix a problem on a boat which I do not own. I have invested over $1000.00 in the boat for survey expenses, haul out charge, and 3 trips to see her, and think it is best to cut my looses. I do not want to pay another $300-$400 to get someone to look at the engine and transmission when that may or may not be the case. Not to mention what could be $1,000's in repairs.

I love the boat, but the bottom line is there are many more boats that fit my needs just as well, and this was just has to big of a questions mark. I apologize and wish you the best of luck in selling the boat. I know you have others in line behind me. I would be glad to sell my survey to any prospective buyer for 1/2 my cost of survey and haul out($375.00).

If the boat is repaired and the other buyers do not pan out, I would consider putting in a different offer

-Will"

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  #48  
Old 04-29-2010
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No need to apologize or explain yourself to the broker. He's the one trying to foist damaged goods on you. He wasn't doing you any favors.
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Old 05-05-2010
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I'm disappointed. I was looking forward to finding out what the problem was.
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Old 05-06-2010
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Me too.
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