SailNet Community - View Single Post - Gemini 105MC Slow speed under power
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post #14 of Old 04-24-2010 Thread Starter
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Thank you all for your input and ideas so far. In summary these are the ideas I have gathered from myself, the seller, the surveyor, and all of you;

Things that could cause the slower speed

1. Hulls not parallel as a result of the accident
2. Centerboards dirty or damaged
3. Transmission slipping
4. Prop smaller diameter or less pitch (non-factory)
5. Something on the prop causing it to wobble or damage to the prop
6. Dirty/old fuel causing less HP

Things that have been ruled out

1. Boat is over weight (It is carrying about 800 pounds of extras, but only 2 of us were on board)
2. Slower speed due to less buoyancy in fresh water (verified with Gemini owner in Lake Michigan this is a non-factor)
3. Engine not reaching full RPMs (Tac read 3200 RPMs)
4. Instruments being faulty (GPS Confirmed)
5. Bottom Dirty (owner stated bottom was recently cleaned however will be double checked with Haul Out)

This is not hypothetical, nor a trick is a real world example of a problem that I hope together we can solve.

Last edited by TexasWill; 04-24-2010 at 05:34 PM.
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