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post #1 of Old 04-24-2010 Thread Starter
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Gemini 105MC Slow speed under power


I am purchasing a 2001 Gemini 105MC. According to other owners website she should get 7 knots under power, but during our sea trial she maxed out at 4.9 knots.

She has the standard westerbeck 27 hp diesel with around 900 hours.

The centerboards were down during the sea trial.

Both instruments and GPS indicated same speed.

She is in Fresh Water (thought this was a factor, but after speaking with another owner on Lake Michigan his boat does go 7 knots under power)

She has a Generator and 2 AC units. (thought this was a factor but the Gen Set is only 295 pounds, and both ACs are under 100) Even with the 2 of us on board and everything extra I could come up with (water, fuel, battery bank, Kayaks), she still had less than 1500 pounds of additional weight.(1100 stuff +400 for 2 people)

The Engine appears by the tachometer to get to full RPMs (3200RPMS) and there is no audible slipping of the engine or transmission.

The boat was capsized in 2005, but did not suffer any hull damage beyond a hole in the side of one hull.

Any theories anyone has to help explain this would be appreciated. I really love the boat, but a 25% knock in performance is unacceptable. I have no idea how to test if she suffers the same performance hit under sail.

The survey is next Tuesday so any thoughts I will relay to the surveyor. Thank you.


Last edited by TexasWill; 04-24-2010 at 10:31 AM.
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