[Public-list] diesel engine

[Gordon Laco]

Very articulate, Don.

In my own case, I would not go to diesel except in order to extend range
when I go on the big voyage.  And when that happens, it may well be more
economical and less trouble to buy a diesel with a boat around it than a
diesel to put into my boat!  I have thought long and hard about a second
fuel tank which I may put into the starboard cockpit locker.  I figure that
if I only use it on trips the weight won't bother us too much when racing.

Cheers - Gord #426 Surprise

PS I just got back to the office from putting down the deposit on an Awlgrip
job on old Surprise.  What an indulgence but what the heck, yesterday was my
birthday.






> We are back to power and props . There is an optimum prop for every motor and
> the rules of thumb for this is 1" of diameter is 2.5" of pitch and 2" of pitch
> will change the RPM by 450. Match the prop to the performance curves - Torque,
> HP and fuel consumption - to fit the motor not the boat or skipper. The hull
> speed of an Alberg 30 is about 10.5 feet per second.
>   A more recent comment talked about having more HP in reserve for times when
> needed. This is pointless if the power cannot be transferred to the prop. You
> need to consider effective thrust on the prop not HP in reserve. And the boat
> will still only go at 10.5 feet per second. (The spec on the A4 from
> dynomometer
> tests is that the motor will put out 36 HP at 3600 RPM. Effectively we can
> only
> get to 2000 RPM in our application. We have power in reserve but of no use.)
> Diesels run most effectively and efficiently when they are at the peak of the
> torque curve and  with a constant load. Thus, they should be run at that
> amount
> of throttle regardless of the sailing conditions so again the effective HP is
> decided by the design of the motor. Using a diesel at less than optimum will
> only carbon things up.
>   As Gord says "Why do we need a diesel"!! I would contend that it is only
> needed if one needs to extend the motoring range of the boat and in that case
> consider a trawler. On the other hand, if the current gas engine has worn out,
> then it is an alternative that is worth considering, since no-one seems to be
> using small, gasoline inboard engines for marine applications these days.
> Don  #528
> 
> "sousa, stephen (ENG)" wrote:
> 
>> We have a Yanmar 13 hp and see the same as other folks for performance and
>> fuel usage. Will the 11 hp push an Alberg, sure it will. The other question
>> is what type of gear reduction did Universal use with this motor.
>> 
>> Lee what is the hp of the Volvo currently in your Alberg? This will give you
>> some type of comparison from the Volvo which is X hp to an 11 hp. IMHO from
>> reading about boats similar in size such as a Baba 30, the prop on the
>> Alberg could be larger than what we have for a diesel application, taking
>> into account when the boat was designed the spec was an A4 or Grey with much
>> more horsepower. It would be great if we could put a 14 inch machine pitch
>> wheel on this boat, it would take quite a lot of work with limited payback.
>> 
>> Stephen
>> #114
>> 
>> -----Original Message-----
>> From: public-list-bounces at alberg30.org
>> [mailto:public-list-bounces at alberg30.org] On Behalf Of Richard Mair
>> Sent: Wednesday, February 02, 2005 7:40 PM
>> To: Alberg 30 Public List -- open to all
>> Subject: Re: [Public-list] diesel engine
>> 
>> We have a Renault RC8D engine. This is a single cyl 8
>> hp diesel. Two blade 13 in prop(i forget the pitch).
>> On flat water we get just under 6 knots.We usually run
>> it at about 5 knots if the wind dies and we have to
>> get home..If there is wind it stays shut down. Used
>> 1/2 the 12 gal. tank for the season using the boat
>> every weekend and on wednesday night racing    Richard
>>                                                   ---
>> FINNUS505 at aol.com wrote:
>>> Does anyone have an 11 hp diesel engine in an A30,
>>> and if so, does it get
>>> the job done?
>>> Thx,
>>> Lee
>>> Stargazer #255
>>> _______________________________________________
>>> Public-list mailing list
>>> Public-list at alberg30.org
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>>> 
>> 
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