[Rhodes22-list] Trailer

[ROGER PIHLAJA]

Hi All,

Sea water is 8.55 lbs/gal, or about 2% more dense than fresh water.

All the hydrocarbon liquids are about 10% less dense than fresh water.  But, keep in mind that many of the commonly used fuel gases are vapors at room temperature:
Boiling Point @ Sea Level (deg F)
Methane: -259
Ethane: -128
Propane: -44
Isobutane: 11
n-Butane: 31

All of these materials come from natural gas, which is mostly methane.  The higher molecular weight hydrocarbons are naturally present in varying amounts depending on the natural gas field.  They are more valuable than methane and are usually separated out prior to the methane being sent down the natural gas pipeline.

Note that n-butane is barely a vapor at room temperature.  For this reason, it is not considered a very good stove fuel.  n-Butane is much more valuable as a petrochemical feedstock.  The 1 lb propane cylinders sold in hardware stores contain nearly pure propane (98+ %wt).  But, because propane boils at -44 deg F, the cylinder it is sold in is actually a steel pressure vessel.  This cylinder adds more weight than was saved by using the less dense fuel.  The disposable gas cylinders commonly sold for camping stoves typically contain 80%wt propane and 20%wt isobutane so the stove will operate in cold temperatures.  However, because isobutane and n-butane are chemically similar, they are very difficult to separate.  For this reason, commercial grade isobutane can typically contain 2-6%wt n-butane as a contaminant.  Low grade camp stove fuel tends to contain more n-butane and may not work in your stove on a cold morning.  This camp stove fuel must be sold in a steel pressure vessel, also reducing the weight savings.

Roger Pihlaja
S/V Dynamic Equilibrium

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Ric Stott<mailto:ric at stottarchitecture.com>
Sent: Sunday, May 23, 2021 10:24 AM
To: The Rhodes 22 Email List<mailto:rhodes22-list at rhodes22.org>
Subject: Re: [Rhodes22-list] Trailer

Fresh water and salt water are different.

Sent from my iPhone

> On May 23, 2021, at 10:07 AM, Lowe, Rob <rlowe at vt.edu> wrote:
>
> Lee,
> A gallon of water will weigh more.  Looks like butane is around 5 pounds per gallon. - rob
>
> ________________________________
> From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> on behalf of Lee Kuhn <lvjkuhn at gmail.com>
> Sent: Sunday, May 23, 2021 9:58 AM
> To: The Rhodes 22 Email List <rhodes22-list at rhodes22.org>
> Subject: Re: [Rhodes22-list] Trailer
>
> Rob,
>
> But what weighs more?  A gallon of water or a gallon of butane?
>
> Lee
>
>> On Sun, May 23, 2021, 9:44 AM Lowe, Rob <rlowe at vt.edu> wrote:
>>
>> Water is 8.34 pounds per gallon. - Rob
>>
>> ________________________________
>> From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> on behalf of Lee
>> Kuhn <lvjkuhn at gmail.com>
>> Sent: Friday, May 21, 2021 5:33 PM
>> To: The Rhodes 22 Email List <rhodes22-list at rhodes22.org>
>> Subject: Re: [Rhodes22-list] Trailer
>>
>> Oops!  Thanks.
>>
>> But how much does a gallon of water weigh?
>>
>> On Fri, May 21, 2021, 5:25 PM Michael D. Weisner <mweisner at ebsmed.com>
>> wrote:
>>
>>> Lee,
>>>
>>> Please check your math. The tongue weight should be 10% of 5,000 lbs. or
>>> 500
>>> lbs., not 50 lbs.
>>>
>>> Mike
>>> s/v Wind Lass ('91)
>>> Nissequogue River, NY
>>> I'd rather be sailing :~)
>>>
>>> -----Original Message-----
>>> From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> On Behalf Of
>> Lee
>>> Sent: Friday, May 21, 2021 4:44 PM
>>> To: rhodes22-list at rhodes22.org
>>> Subject: Re: [Rhodes22-list] Trailer
>>>
>>> I've never trailered anything before so I checked with the archives, the
>>> Internet, and Stan.
>>>
>>> Looks like:
>>>
>>> 17-inch coupling height
>>>
>>> 2-inch ball
>>>
>>> 4-prong electrical connection
>>>
>>> safety chains (do those come with the trailer?)
>>>
>>> 10 to 15% tongue weight which would be 50 to 75 pounds with a 5,000 pound
>>> boat/trailer.  Stan feels more comfortable with 100 pound tongue
>> weight.  I
>>> don't believe everything I read on the Internet so I'll go with Stan's
>>> recommendation.  Apparently too little tongue weight and your trailer
>> will
>>> fishtail and too much tongue weight will overload your rear tires and
>> could
>>> create a variety of handling and braking issues.
>>>
>>> Lee
>>> Soon to have a 1999 Rhodes22
>>> Claytor Lake, VA
>>>
>>>
>>>
>>> --
>>> Sent from: http://rhodes-22.1065344.n5.nabble.com/
>>>
>>>
>>