dinghys, davits, and engines

[Old PDQ Message Board]

dinghys, davits, and engines

Posted by Chris Randolph on July 11, 2001 at 17:48:00:

Hi everyone- I have a new 32 that I just brought down to the Chesapeake from
Whitby. Our dinghy is a 9 foot RIB, with a 9.9 HP 4-stroke outboard

I had a heck of a time trying to hoist it on the davits with the engine on- not
only is it very heavy, but I couldn't rig a line to the stern eyebolts in the
dinghy in a fashion that would allow the stern to be lifted high enough. I ended
up leaving the engine off for now (hoisting it without the engine is a piece of
cake!)
I am now considering either getting a smaller engine or buying a motor hoist for
the stern rail. Anyone with any suggestions?
Chris Randolph
s/v Folie a Deux

Follow Ups:

Re: dinghys, davits, and engines jack coulter 06:16:12 07/20/01 (0)
Re: dinghys, davits, and engines Chris Randolph 10:46:22 07/16/01 (0)
Re: dinghys, davits, and engines Dale Koonce 06:26:19 07/13/01 (0)
Re: dinghys, davits, and engines Bob Cliff 17:11:18 07/12/01 (0)
Re: dinghys, davits, and engines Bob Cliff 17:06:13 07/12/01 (1)
Re: dinghys, davits, and engines Roger Ford 06:52:10 07/12/01 (0)
Re: dinghys, davits, and engines Colin Swithenbank 19:20:47 07/11/01 (0)
Re: dinghys, davits, and engines Roger Wood 19:18:49 07/11/01 (0)

--------
Re: dinghys, davits, and engines

Posted by jack coulter on July 20, 2001 at 06:16:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

Hi Chris: Leaving an ob engine on the dinghy transom is a big no no. These
transoms are not designed to have that much wgt unsupported. On "MojO" my 36, we
use a St. Croix lift and we have an Edison ob bracket that we put our 15hp
Yamaha on. Our dinghy is a 11 ft. aluminum bottomed Force Four (mfg'd in New
Zealand); very high quality dink, but they even state in the manual that the
warranty is voided is an ob is left on while slung from davits. Hope this helps

Jack "Mojo" hull #78

Follow Ups:

Re: dinghys, davits, and engines

Posted by Chris Randolph on July 16, 2001 at 10:46:00:
In Reply to: Re: dinghys, davits, and engines posted by Bob Cliff on July 12,
2001 at 17:06:00:

Thanks to everyone for their helpful comments- (I'm just back from a beautiful
3-day weekend sailing on the Chesapeake!) I think we may have bitten off a
little to much with the 9.9 4-stroke (it does weigh close to 100 lbs). Sounds
like a lighter engine with one of the lifting options suggested would be my best
bet. The new engines may be great for the environment, but they are rough on the
lower back! thanks again to all,
Chris

Follow Ups:

Re: dinghys, davits, and engines

Posted by Dale Koonce on July 13, 2001 at 06:26:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

I have a 32 with a dinghy on davits. I have solved this problem of weight/taking
off the engine

I leave the engine on the dinghy (15 hp 2 cycle). I have installed two u-bolts
through the top of the transom on the dinghy (aluminum on mine) I have then
installed a second block to the davits. I have two blocks for the stern of the
dinghy and one for the front. This allows me to pull up one side of the dinghy
and then the other. It is much easier to just have to pull up one side of the
dingy stern rather than both. Also by having u-bolts on the transom I am able to
lift the dinghy up much higher and it seems to ride better as well

Hope this helps.

Follow Ups:

Re: dinghys, davits, and engines

Posted by Bob Cliff on July 12, 2001 at 17:11:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

I looked at my reply and notices that my "diagram" got reformatted. To see it
correctly move the single dashed to the right until the left end is at the U

Then move the line of "I"s OB to the left until they line up with the end of the
single dashes (----). Hopefully you can do this in your mind's eye. Good luck.

Follow Ups:

Re: dinghys, davits, and engines

Posted by Bob Cliff on July 12, 2001 at 17:06:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

We also have a 32 with a 9 foot RIB and we have an 8 HP Yamaha. I keep the motor
on a motor mount over the aft rail in the center. Lowing and raising the dinghy
is easy this way. To handle the motor I had a boom extension built to which I
attach a block and tackle to help lower and raise the motor. I put a motor strap
on the engine (available at any marine supply store) to attach the block and
tackle

The boom extension was made out of aluminum box section material (about 1.5 in

by 3 in.) to which is welded a hook that goes it the end of the boom and U
shaped cradle that is welded on the end of the section something like this…
=======U=====7
---------------
I
I
I
OB
Motor
(Imagine the U is the cradle and the 7 is the hook that goes into the end of the
boom, both are welded to the box section. The ---- is the box section itself,
and the === is the boom, while the I is the block and tackle that attaches to
the engine)
The extension is light and easy to mount on the boom. Cost to have it fabricated
was $250. To use just rest the cradle under the boom and insert the hook into
the boom end. Add the block and tackle and it makes raising and lowering the
boom easy and safe. If you want a pix I'll take one, scan it and send it to you

It will take a week or so to do, so let me know if the above is not clear
enough. Hope this is helpful.

Follow Ups:

Re: dinghys, davits, and engines

Posted by Roger Ford on July 12, 2001 at 06:52:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

As Colin does, we have an engine mount on the port aft rail of our 36. We lower
the dinghy first, and then take the lifting line to the engine which allows us
to easily lift the engine by hand to the aft deck, and then lower the engine
onto the dinghy with the block and tackle without any strain on the back

We have a 5HP 2 stroke which is a good weight to handle and adequate - but I
would consider it minimum acceptable HP

We sometime leave the engine on at anchor and lift it just out of the water on
the davits, but I wouldn't consider sailing with the engine on the dink.

Follow Ups:

Re: dinghys, davits, and engines

Posted by Colin Swithenbank on July 11, 2001 at 19:20:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

Chris: On my PDQ 36 I put an engine mount on the inside stern rail and lift the
engine with the dinghy davit before lifting the dinghy. Particularly in heavy
water I like to have the minimum of weight on the davits. My engine is a 15 HP
2-cycle and weighs about 80 lb

Colin

Follow Ups:

Re: dinghys, davits, and engines

Posted by Roger Wood on July 11, 2001 at 19:18:00:
In Reply to: dinghys, davits, and engines posted by Chris Randolph on July 11,
2001 at 17:48:00:

That 9.9 4 stroke is one heavy engine !- I think it's about 100 lbs. I've found
the best compromise is a 6 hp 2 stoke (I have an old Evinrude) It puts my RIB on
a plane with one person, moves 4 with grocerys ok - and is still lift-able. more
than that just gets to heavy. Before that I had a 4 hp 2 stroke (Yamaha) and
that was ok, but the boat wouldn't plane. Good Luck with the boat! Roger