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Old 03-16-2018, 05:18 AM   #1
City: Oldsmar, FL
Country: USA
Join Date: Feb 2018
Posts: 14
Impact of dinks on speed

To those of you with a davit and dink on the aft of your Mainship --- what happens to your speed? Can you still get her up on plane? Can. you still get to 16+ mph with the dink up on the davit? I see many Mainships with NO dink and wonder why....Have 440's...

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Old 03-16-2018, 05:34 AM   #2
O C Diver's Avatar
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 8,966
My slip neighbor a year ago had an inflatable on transom davits and had no problem getting it up on plane. Not sure which engines he had in his MS.

You will see a number of boats without dinghies. Some people view their boat as dock to dock transportation. Others may have inflatables, use a kayak, or have some other form of watercraft.


I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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Old 03-16-2018, 01:10 PM   #3
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City: Kenai, Alaska
Country: USA
Vessel Name: Melanie Rose
Vessel Model: 1999 Willard PH
Join Date: Feb 2013
Posts: 902
Dragging an inflatable is a fuel sucker on a planning hull, you have enough power to get on plane with it but it will affect your fuel economy. I made a run towing an inflatable that I had made numerous time before with the tender inside the boat, and ran out of fuel 20 miles short of my destination. I don't believe at displacement speeds towing would make any difference, but at planning speeds it definitely does.

I made numerous trips afterwards to the same destination and never ran short again... I never towed the tender (soft inflatable) on plane again!
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Old 03-16-2018, 02:30 PM   #4
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City: Philadelphia
Country: USA
Vessel Name: Dreamers Holiday
Vessel Model: Mainship 390
Join Date: Jun 2010
Posts: 509
we have a 390 with a single 370 Yanmar. keep a dingy on the swim platform when travelling. Boat will not plane with or without the dingy. cruise is 9 kts
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