Gimme Power !!

I've done a little research as far as the hot water system issue is concerned for outboard powered boats.
It seems that if you want to avoid the use of gas (lpg etc) - which is a good idea in any petrol engined boat - then the only real option is to go for a 240 / 120 volt immersion style heater run via an inverter when the engine is running.
At first this seems a little awkward, but if you consider the choices made for inboard powered boats, the end result isn't vastly different. Most hw systems operate on high voltage when the vessel is connected to shore power (or generator) or through a heat exchanger when the engine is running, so you can still only generate hw by running the motor when you're away from the dock. And in my experience, in commercially made units, the immersion element is a more effective heater than the heate exchanger anyway.

 

Could someone give me a quick summary(ex. speed, power), you Guys left me behind. WAY WAY BACK!! Thanks in advance...........

 

I REALLY miss starting topics(being a captian or atleast a Co-Captian)

 

Nomad, as requested - speed choices made so far:

1. Max speed 25 - 28 knots
2.Max Cruise 20 - 22
3. able to maintain planing down to 12 knots and economical to operate throughout its speed range

Later we could give consideration to the GTi Expre$$ version.

 

Thanks Will you have been a big help today!!

 

Just noticed that the planing speed is approx. the same as the "ORCA" 31' and 36'.

 

Boghammar boats

regarding the Boghammar boats u mention. One of our boats that is more known is the type we built to Iran. A 13 meter long patrolboat with "second effort" Surface drives, doing roughly 60 knots.

Best regards
Wilhelm Boghammar

 

Hmmm - show us pics Wilhelm!

 

Why ?

Portager,

pure engineering doesn't apply neccessarily - to marketing or building
recreational boats.

Builders, concerned with man hours, love stern drives. Because you
just cut a round hole in the flat part at the back of the boat - glass in
something to bolt the engine too - and you are ready to shove in the unit.

Also wiring up the inboard - usually goes pretty quick.

Conversely, I have spent DAYS - installing an O/B bracket and getting
all the wires in place, in a sanitary and shipshape manner.

From a design point of view - beyond 18' - outboards become harder
and harder to justifie.
- Because the bigger they get, the less seaworthy, generaly - things become.
- Also - the stresses on the transom can be of concern. As weight and
H.P. escalate.
A client once asked me to design a vessel that would have had FOUR !!
giant outboards - hanging in space - off the end of his boat.

I refused to do it.

Subsequently, a race boat rigged this way - lost it's transom.
- And the FOUR giant O/B's on it .......and then quicly the boat sank as well.

There are sound engineering reasons - for inboard installations.