Otech 7m Military outboard conversion

[Todd Grimley]

Finally finished and posting something on my lastest project boat...engine and drive were removed before landing in Australia. Super happy with performance... 700 mm full floatation pod with low hour 2001 Yamaha 250hp 2 stroke, first of fuel injection. Sweet motor. More to come!!

[Todd Grimley]

[jwalker]

[ncp]

Probably a bit thirsty but that thing has to fly now!

[Todd Grimley]

Originally Posted by ncp

Probably a bit thirsty but that thing has to fly now!

It does fly and is a bit thirsty.. tops out at 44 knots with the original Yamaha prop! will change over to 4 stroke one day, but find it a sweet motor.. low hour. Feul injection .
Wasn’t sure how it would perform with outboard , but seems to handle anything we throw at it

[Todd Grimley]

[ncp]

I know some people disagree, but to me 44 knots is "fast enough"!

That bracket makes it sit perfectly in the water.

[Todd Grimley]

Originally Posted by ncp

I know some people disagree, but to me 44 knots is "fast enough"!

That bracket makes it sit perfectly in the water.

Haha yeah plenty fast enough and out of the hole is instant . Happy with the pod too

[ncp]

Do you deflate the tube to tow?

I know Australia has some rather restrictive width requirements compared to the US.

8 ft. ? Here the standard is 8'6 but anything under 10'0 is a simple $100/yr permit (no signs, no pilot cars)

[Todd Grimley]

Here in Queensland,We can download a permit to tow long or over width boats or trailers ,between 2.5 meters ( being our max standard trailer width) and 2.9 metres(8.2 feet to 9.5 feet),which has a heap of rules around it like “over with” signs front and back and flags on widest points.. driving daylight hours .. no major roads in peak times etc.
Over 2.9 metres you need an escort vehicle

[Todd Grimley]

[ATTACH]136891
My previous boat ex Australian Navy

[ncp]

Originally Posted by Todd Grimley

Here in Queensland,We can download a permit to tow long or over width boats or trailers ,between 2.5 meters ( being our max standard trailer width) and 2.9 metres(8.2 feet to 9.5 feet),which has a heap of rules around it like “over with” signs front and back and flags on widest points.. driving daylight hours .. no major roads in peak times etc.
Over 2.9 metres you need an escort vehicle

Sounds pretty simple for slightly overwidth. (just like here)

I've been looking at Australian cats and always thought the rules were much stricter since they make all these cats that look way to narrow for their length because they have a 2.5m beam.

[skidoodog]

Very fine work there Todd. I love the bracket and how the boat sits with it.
cool.

And yes 44 knots is pretty fast in a Willard.

[Bigtalljv]

Nice boat!

[Todd Grimley]

Originally Posted by ncp

Sounds pretty simple for slightly overwidth. (just like here)



I've been looking at Australian cats and always thought the rules were much stricter since they make all these cats that look way to narrow for their length because they have a 2.5m beam.

Lot of the cats and other trailer boats built here are max 2.5m because strict rules of trailer width... the permit for over width boats was brought in on the back of lots of boats being imported from the states.
Cats are popular offshore boats here mainly used by fishing charters and rescue/ police . Rescue and police are fast changing to RIBS

[Todd Grimley]

Originally Posted by skidoodog

Very fine work there Todd. I love the bracket and how the boat sits with it.

cool.



And yes 44 knots is pretty fast in a Willard.

Thanks mate, I enjoyed the process. I was too impatient on my first build with the ex Australian navy rib and didn’t allow myself to enjoy it as much as I wanted too. I would of done a few more things to it, while I had it apart. Live and learn.
Your project look cool... the D6 are meant to be an absolute screamer.
Enjoy the process.

[Todd Grimley]

Originally Posted by Bigtalljv

Nice boat!

Cheers mate

[Todd Grimley]

Does anyone know much about the hull design on these Otechs I remember reading somewhere on here that they were a uk design.
Looks like Ocean Technical Services have gone out of business and am keen to find out a little more about their history.
Different hull design to Willard/ H733, but I gather same build specs.
TIA

[xlgum]

I have a duarry cormoran and this is almost the same boat. (Console is a bit different)
Also zodiac has a boat almost similar to these ribs, so for info u can try search these companies.
For my use i have installed a alamarin waterjet, motor is stil the Volvo Penta kad44

[Todd Grimley]

Cheers mate, nice boat[emoji1362] they’re a dry ride.