Re: On the fence 11 or 12 foot?
Welcome to the forum and thanks for the imput!!!! keep posting
Thank you for the greeting.
Salut!
I have learn a ton of stuff off of the iBoats forums
and if possible I would like to make productive input.
With an old 1963 Evinrude Fastwin 18 HP
( looks like something George Jetson would own )
that 365 class SIB makes an easy 19 or 20 mph on plane
( 365 as in centimeters is 11 foot 11.7 inches, just under 12 feet as far a registration goes
with 800 to 1000 lbs total
boat + motor + fuel + gear + cooler + passengers/crew - all on board weight,
and again, properly loaded / trimmed
( though she was priorly in pontoon boat service )
( the motor does not seem tired at all, as it is no problem for her to )
( put a typical 14 foot deep v hull loaded up with 3 fishermen )
( all their gear and a cooler for an afternoon of fishing up on )
( plane at 22 or 23 mph)
( she just seems to drink a lot of fuel: 3 or 4 gallons per hour )
( where I think it should be more like 2 [topic for another thread] )
I never shoot it out of the hole,
just roll on the throttle
and she comes right up on plane.
I also do not stay or go on plane in any sort
of rough conditions at all. That old 18 HP OMC
design was the foundation for later 20 and
25 HP models where essentially all that was
done is that the top end was widened ( the
motor was able to turn more RPM's without
loosing too much torque, thus generate
more HP, via carburation, induction, and
exhaust improvements). As such not only do
I fully appreciate the low end torque
characteristics of that old 18 HP Evinrude,
as it is very commanding in rough conditions,
but based on my experience with it, I would
have to say in a brand new motor for a 365
class SIB, you really ought to be looking in
the 18 to 30 HP range, maybe as low as
15 HP. It is just too bad though the new
motors weigh so dang'd much, that Fastwin
weighs about 85 lbs.
I might be going out on a limb here in ignorance of forum rules and etiquette as far as linking goes,
but Duckworks has a really interesting article on water skiing ( including construction of )
Duckworks
that includes some graphs depicting the performance of a given hull versus
combinations of different motors & different loads ( passengers and water skiers ).
The page for the 35, 18, and 10 HP outboards
http://www.duckworksmagazine.com/05/columns/max/6/waterski12.gif
is very indicative as to just how easy it is to bog down a 10 HP motor.
There is also some illustration of how different props may help boost
performance somewhat or result in an over RPM situation.
BTW
Max's other articles basically led the way to my stumbling upon what great motors those
old 18 HP OMC's are. I started reading like crazy about old OMC outboards as I was
studying for the purchase of what turned out to be that 4 HP Johnson I commented
about earlier on in this thread. Max's articles are also the beginning of what lead me
to purchasing a SIB. I desired an old 18 HP OMC, but what is the point of having an
( well, that and memories of the Ole LoneStar Saratoga with the Evinrude 40 HP Lark on the back of it)
outboard and nothing to put it on. I already was paying for storage of a sailboat ( that
is what I bought the 4 HP for ), if I was to get another boat, I needed to be able to
"hide" it in the garage at the condos... Turns out a cheapie chinese vinyl 365 class
SIB with aluminum floor fit the bill and budget perfectly.
