[Public-List] outboards

[Gordon Laco]

Hello gang - 

Don is right about all that... And I would add that even with the hatch
open, the engine will not be getting enough clean air.  Nor will you!

I know a boat whose owner was driven to try fitting a blower to direct air
to the engine - that was moderately effective but they were still not
getting full power from the outboard, and the complexity of the jury rigs
that were accumulating to make the laz mounted OB work - and it still didn't
really work, made the whole thing dissapointing.


G


On 5/8/09 1:27 PM, "Don Campbell" <dk.campbell at sympatico.ca> wrote:

> Hi John;
>   This is not meant to denegrate your ideas of changing the lazarette
> because that is always a possibility. Be aware that changing the
> lazarette is not a just piece of cake or without compromises.
>    The Alberg 22 has the outboard in the lazarette and there are
> problems there too. I have had  first hand personal experience with two
> of these.
>    First, the controls are not much different for availability from
> what you describe, particularly the starting pull cord. The choke is
> always awkward to reach because it is in, under and around things with a
> lip on the laz., and the gear shift is not much better. It never seems
> to be a straight pull on the cord for starters,  regardless of how the
> cord lines up with the holes cut for the purpose. Knuckles banging on
> tillers is a given.
>   Then there is the problem of having a watertight bulkhead between
> the lazarette and the bilge because now you have the bottom of the boat
> open to water ingress. We have found that the worst part is that if one
> has controls for the motor running through to the cockpit, then those
> conduits must also be leak proof to the bilge,  to avoid water coming in
> when the boat is sailing on a heel. This water in at these times can
> fill the bilge in only a few minutes if you really get going and bring
> in water under some pressure ( see below). I have managed to get more
> than 20 imperial  gallons into a AL22 within 10 minutes on a really
> sprightly breeze and about 20 degrees of heel. That is an extra crew
> member sloshing in the bilge and that one is not wanted when a crew of
> three is about right for this boat! The worst leaks are at the deck
> joint and the control  conduits,  including the starter cutout, which
> becomes the third place for leaks back here. Wires for electric starters
> need to get into the boat as opposed to into the cockpit so waterproof
> is with some technicalities. Just getting the shape of the bulkhead into
> the position of the front of the lazarette is difficult and the more
> pieces it takes, the less strong it will be. Glassing and manipulating
> pieces of wetted out fabric is not easy either, especially the corners
> at the toe rail. Been there, done that !
>    The possibilities of reversing the engine with a 180 turn do not
> exist because there is not enough room in the laz. at the back to take
> the height of the front of the motor facing backwards,  particularly the
> steering arm and fuel control system as it is usually at right angles to
> the normal, down and forward position. If it is folded right  back at
> the 180 position, then reaching it and using the gearing at that angle
> for fuel controls gets to be a problem..
>   There is only one currently produced motor that will fit the laz of
> the AL22 and that is the Nissan 9.9 two stroke. One cannot fix or lock
> the position of the turning mechanism on this motor either so it will
> wander with vibrations when running. None of the Tohatsu models (Mercs
> and Yamaha) will fit and have the lid close. Four stroke engines have
> really big cowls to the prop and so none of them fit the hole size.
> After that, we are back to trying to maintain old motors and you may as
> well work on an A4 as an old Evinrude or Johnson. Most of the smaller
> outboards do not have electric starters either. It is available on the
> Nissan 9.9 2 stroke.
>   Once underway, the stern dips and then the back of the cut-out for
> the prop shaft is often under water. That then fills the laz with water
> under pressure from forward motion  and really slows progress when
> sailing or motoring. Waves don't help because they will often surge aft
> against forward velocities. You need crew on the bow to level the boat
> to help in solving this one.
>   One more major  last thing. Under power, there is not enough airflow
> through the boat,  and exhaust possibilities, even with the exhaust
> through the prop, to allow the motor to run and provide enough clean
> oxygen for the motor without the laz. lid open. Therefore, you get both
> all the the noise reflected forward from and some fumes back up through
> the open laz. lid. This will be more noise and fumes than you now have
> with the motor down and aft of the transom.
>   Oh and did I mention that there are not many small motors that will
> give you a reasonable prop pitch for this mass! These small obs were
> designed and built for max 16 foot woodies and rubber rafts, so 1000 lb
> loads not 10, 000 lbs.
>  
> Don
> #528
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