[C320-list] Engineers - was - Leak in bilge

[Bruce Heyman]

I don't get your point?
Best,
Bruce
Somerset 671 SoCal

Bruce Heyman
(949) 289-8400
BruceHeyman at cox.net

-----Original message-----
From: Chris Burti <clburti at gmail.com>
To: C320-List at catalina320.com
Sent: Sun, Jan 23, 2011 13:28:52 GMT+00:00
Subject: Re: [C320-list] Engineers - was - Leak in bilge

I can't resist sharing an observartion I once read or heard about Engineers.

An Optimist says that the Glass is half full;

The Pessimist says that it is half empty...

The Engineer states that it is the wrong size.




On Sun, Jan 23, 2011 at 1:36 AM, Utility Email <kswanson123 at comcast.net> wrote:
> Bruce
>
> The Society of Women Engineers (SWE) website reference is great.  I have one of their engineering dictionaries that gets a lot of use by the younger engineers in my design office (bought it in college 25 years ago, out of print now).  Thanks for their website reference, there is a lot of good stuff there that I didn't know about!  Thanks.
>
> Dave
>
>
>
> On Jan 22, 2011, at 6:05 PM, "Bruce Heyman" <bruceheyman at cox.net> wrote:
>
>> David,
>> Thanks for commenting!  The reason I brought up Archimedes is because he is
>> widely credited for figuring out simple machines and as far as I'm concerned
>> a bolt and nut are a simple machine.  The threads form the incline plane.
>> http://www.swe.org/iac/lp/inclined_03.html
>> Best,
>> Bruce
>> Somerset #671 SoCal
>>
>> -----Original Message-----
>> From: c320-list-bounces at lists.catalina320.com
>> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Utility Email
>> Sent: Friday, January 21, 2011 11:09 PM
>> To: C320-List at Catalina320.com
>> Cc: <C320-List at Catalina320.com>
>> Subject: Re: [C320-list] Leak in bilge
>>
>> Well, I'm a structural engineer.  After reading this post, I was confused
>> too.  Here are some clarifying remarks by an SE.
>>
>> 1.) If you draw a free body diagram, you will see that the keel bolts do in
>> fact hold up the keel.  The connection between the keel bolt nut and the top
>> of the keel will in fact stretch these large SS bolts as it compresses the
>> hull in this area.
>>
>> 2.) I would agree with this statement, but adding one important item that
>> these bolts do in fact support the keel.
>>
>> 3.) True that a threaded bolt and threaded nut transfer rotary gorge into
>> vertical movement along the axis of the bolt to hold two surfaces together.
>> It is not clear to me what the rest f the statement is getting at,
>> especially the remark about Archimedes who ave us th principal of buoyancy.
>>
>> 4.) A torque wrench is typically calibrated to take into account the
>> friction between the nut and the threads in the, so called, "machine.". The
>> torque in the wrench is calibrated to relate to the axial load (or
>> pretension) in the bolt.
>>
>> 5.). I'm not sure if this is correct.  Preload is not related to material
>> strength.  Machine design tables would provide this information.  Preloaded
>



-- 
Chris Burti
Farmville, NC