Re: Stus-List The stern squats at high speed

Sun, 11 Jan 2015 19:20:07 -0800

‎I've got a 13.5hp 2GM20F In my 26, with a 2 blade Flexofold.
It squats too, and I get ‎black s*#t all over the lower part of my transom.
I'm sure a 1GM would have been enough, but it was in there when I bought the boat.

I think it's the price we pay for having such slippery hulls!

sam :-)
C&C 26 Liquorice 
Ghost Lake Alberta 

From: Dan via CnC-List
Sent: Sunday, January 11, 2015 7:34 PM
To: Gary Nylander; cnc-list@cnc-list.com
Reply To: Dan
Cc: Joe at Zialater
Subject: Re: Stus-List The stern squats at high speed

It was explained to me by an very experienced sailor that depending on boat design the reason the stern drops is the bow begins to ride up on the bow wave.  It was very obvious to me when I used a Honda 9.9 on my Ericson 23’.. at 5KTS it rand true but beyond 5KTS the outboard mount started pushing water and the faster I went up to 7KTS it covered the engine mount.  So as he told me, slow down - if sailors really wanted to motor fast they own power boats..  made sense to me.  So now i try to get all my speed on my C&C 26’ with my sails.  



Dan

On Sunday, January 11, 2015 at 2:12 PM, Gary Nylander via CnC-List wrote:

Join the club. We (and Curtis comments later) have a boat with a flat
transom. Thus, we can notice the squat more than those with boats with
extended sterns and reverse transoms. Mine (30-1) splatters diesel crud all
over the bottom half of the transom as I am motoring at any speed at all. I
used to put a hose on the exhaust, but that looked so bad that I decided I
should just wash off the crud after a vigorous motor.

Comments below on hull speed are relevant.

I cruised on a friends motorsailor - at 7 knots (big motor) the boat was
pretty level, at 8, the bow came up a foot and the stern dropped a foot, at
9, more of the same. Think about a power boat coming up on plane......

Physics rules.

Gary

----- Original Message -----
From: "Joe at Zialater via CnC-List" <cnc-list@cnc-list.com>
Sent: Sunday, January 11, 2015 12:13 PM
Subject: Stus-List The stern squats at high speed


Hi Tom - I notice the same thing on my 30-1 - as I increase revs the stern
squats. I have a two blade fixed prop on an Atomic 4. I sometimes adjust
the throttle by looking over the stern rather than the speedo - kinda
handy.
At high revs my exhaust is completely underwater while it is a few inches
above water at rest.

I don't know if it is really a problem or just a matter of physics - my
power boat does the same thing, albeit more drastically.

Joe Boyle
Zia, 1975 30-1
Annapolis

Message: 5
Date: Sun, 11 Jan 2015 11:54:00 -0500
From: TOM VINCENT <tvince...@msn.com>
To: C&C Forum <cnc-list@cnc-list.com>
Subject: Stus-List The stern squats at high speed
Content-Type: text/plain; charset="iso-8859-1"

I was wondering if anyone else has the same problem that I have with my
36'
that has the 3 cylinder Yanmar 30 HP. While motoring if I increase the
speed
the stern starts squatting the faster I go. I top out at 6.5 knots of
speed
and the stern is way down. I have a martec 18'' folding prop and I do not
know the pitch.

Tom Vincent
Frolic II 1979 36' C&C




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