Re: short shaft on diablo

I use a short shaft Yamaha 25HP 4 stroke. When I bought Diablo it had
a 15 hp short shaft, on 20" (or was it 19"? transom. Ran OK, once in
a while got some prop ventilation, especially with adults in the bow
seat.

I rebuilt much of the boat before putting the 25 on; rather than
cutting the transom down, I cut a 2" deep by 8" wide notch out of the
bottom and transom, effectively creating an 18" transom. May have
lost a bit of speed, but it runs great in very shallow water.

If the boat is already built, try it as is, before playing with
modifications! If you do cut the transom down, just continue the V
profile down to the desired depth. Unless you're doing a lot of
beaching in surf, or plan to hang a heavy beast out on the stern (my
yamaha weighs about 140) I wouldn't worry too much; the corners are
plenty high.

I don't much like Bolger's scheme for flotation in Diablo, though.

Sal's Dad

--- Inbolger@yahoogroups.com, "Kevin Rea" <kevin.rea@n...> wrote:
> hi guys,
>
> have any of you used a short shaft outboard on the diablo boat ?
> if so, how much did you have to cut down the transom to ?
>
> thanks,
> kevin

Another point: whichever way you went, you'd have to be sure you
could still steer the boat. With the pod, a tiller extension could be
OK as long as it clears the original transom.

Howard

--- Inbolger@yahoogroups.com, "Howard Stephenson"
<stephensonhw@a...> wrote:

> Assuming the boat's designed or built for a 20" long-shaft

outboard,

> you'd need to cut it down by 5", measured vertically, rather than

down

> the sloping transom. And you should build an outboard well so that

the

> hull's freeboard is not reduced and safety compromised.
>
> Or you could add a pod to the transom and mount the motor on that.

The

> added buoyancy in the pod would compensate for the farther-aft
> position of the motor.
>
> --- Inbolger@yahoogroups.com, "Kevin Rea" <kevin.rea@n...> wrote:
> > hi guys,
> >
> > have any of you used a short shaft outboard on the diablo boat ?
> > if so, how much did you have to cut down the transom to ?

Assuming the boat's designed or built for a 20" long-shaft outboard,
you'd need to cut it down by 5", measured vertically, rather than down
the sloping transom. And you should build an outboard well so that the
hull's freeboard is not reduced and safety compromised.

Or you could add a pod to the transom and mount the motor on that. The
added buoyancy in the pod would compensate for the farther-aft
position of the motor.

Howard

--- Inbolger@yahoogroups.com, "Kevin Rea" <kevin.rea@n...> wrote:
> hi guys,
>
> have any of you used a short shaft outboard on the diablo boat ?
> if so, how much did you have to cut down the transom to ?

hi guys,

have any of you used a short shaft outboard on the diablo boat ?
if so, how much did you have to cut down the transom to ?

thanks,
kevin