[Public-list] another outboard discussion

[Don Campbell]

    I am always amazed at the way modern engineers try to get horsepower or
kilowatts out of small blocks. The way they do it is with fuel injection and
turbochargers - very simple more fuel and or more air. The life of these smaller
blocks is not what the old long stroke,  big bore motors gave us. Be prepared to
buy several of these over the lifetime of  a good inboard.
    At the current time, there are a number of unhappy owners of A4s, primarily
due to either wear on the rings and cylinders from extended usage or  poor
maintenance procedures over the 35 or more years that the motor has been in the
boat. This unhappiness is the result of these motors now  not developing the
hoprsepower they were designed to operate at, which was at least over 18, with a
potential to go over 30. How will a 9.9 HP unit ever provide you with the safety
you require if your sails won't work against a tide,  current or chop? As I have
said earlier this month, the 9.9 is hard at work to propel an Alberg 22 which
weighs 4000 lbs and the same hull design as ours, only on a much smaller scale.
    Since you are  a naval architect and engineer, for a quick test, try the
Alberg hull in a wave tank and see what the drag coefficient does with this
motor that far out on the transom! I have the feeling that 110 lbs on the
transom will be worse than the 350 lbs under the bridge deck for waterline
balance. The other option is to work the propulsion formulae backwards to
determine the required HP with the hull shape/ displacement and desired cruising
speed for the AL30 hull.With the slippage or efficiency factor that you
engineers seem to build in at around 50% , the 9.9 should look very small
indeed, in fact harebrained as you say.
Don
#528

J Bergquist wrote:

> Dear List,
>
>
>
> Me again, with the busted atomic 4.
>
>
>
> So I have been kicking around all kinds of harebrained ideas about how to
> propel my boat when there is no wind. Today I went to the marina where I am
> coming out of the water for the winter (Fairwinds on the Magothy), and I
> discovered that they do a lot of business in outboard motors. I found out
> that I can buy a brand new, four stroke 9.9 hp Yamaha high thrust long shaft
> motor with electric start for only $2200. It comes with a 2 year warranty.
> It weighs just over 100 #.
>
>
>
> Now, my other options are as follows:
>
>
>
> 1.      Install a rebuilt Atomic 4. My short block is worthless. But my
> alternator and carburetor are good. Head and manifold need replacing. By my
> calculations, I need about $4000 to get a rebuild A4 from Moyer. Plus a
> bunch of time and effort to install it.
> 2.      Install a new diesel. This seems to be a good option, but I'm
> currently estimating at least $8000 after I buy shafting, propeller,
> dripless packing, new fuel system, and a few other while-you're-at-its. Plus
> even more time and effort spent installing it.
> 3.      Install electric propulsion. I love everything about this option
> except the range limitation (severe!), the longevity (electronics and
> water.no no), and the unconventional nature (might be tough to sell to a new
> owner). Its cost is more difficult to estimate because there is not much in
> the way of comparables, but it would be at least $5000 and maybe as much as
> $9000. Depending on how many batteries I buy and what kind of onboard
> charging system investment I make (solar, wind, fuel cell - yikes), it could
> be a lot more. Then there is the risk.there's nobody out there who has a
> comparable system and can say yes it works or no it doesn't.
>
>
>
> So I know that Yves Gelinas repowered Jean du Sud with an outboard. And he
> seems to have come up with a nice way of mounting it on an articulating
> bracket on the port side. My existing gas tank is on the starboard side. I
> am thinking that I could make a real nice bracket and install the plumbing
> for gasoline from my existing tank right out to the motor and hook it into
> my existing electrical system (of course, it only has a 10 amp
> alternator.wouldn't charge batteries very fast).
>
>
>
> Even considering the cost differential between this motor and an A4, I could
> buy some really nice canvas, a second bank of batteries to make up for the
> additional time I would have to go between charging (boosting my capacity
> from 200 to 400 amp hours), and a super nice shore-power based charging and
> monitoring system and still have cash left over. Not to mention my boat
> would be a couple of hundred # lighter (would y'all still let me race?)
>
>
>
> Can someone tell me what is silly about this idea? It seems to me a really
> good option. Allows me to invest more time and money in sailing, rather than
> in my motor. It is, after all, a sailboat. Sometimes I think I might forget
> that.
>
>
>
> Your pal,
>
>
>
> J Bergquist
>
> Calliope #287
>
>
>
> PS. Is anybody out there interested in helping me sail my boat up to
> Fairwinds Marina on the Magothy this Saturday? I need crew!
>
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