Topic: OceanWorks Jet drives for 1:12 scale Shannon Lifeboats (Read 42858 times)

Taranis · « **on:** August 18, 2019, 10:41:57 pm »

These are the new kid on the block and there are other options of jet drives as well as steerable korts etc on their Facebook page.
This guide will only concern the thread title.
I'm doing this for the first time hence posted in the R&D forum
More soon..........
I AM NOT CONNECTED TO OCEAN WORKS in any way and I paid full price but since then they have accommodated all my requests HENCE the revised bigger nozzles, the trim tabs, (may be modified again soon ) the intake grills (shown facing wrong way) , the revised reversing buckets and all still within the original price. I must applaud their willingness to fill these needs. Also note that the buckets and trim tabs can be operated left or right.

EDIT I have not made any enquires about possible 1:16 scale as MBD do not produce one and Speedline come complete

Mine here waiting for new parts. I will then start from the beginning

Taranis · « **Reply #1 on:** August 28, 2019, 12:06:46 am »

Fresh picture via messenger
OceanWorks are very professional I think with new packaging ready to go.
My upgrade parts should arrive any day this week .
The trim tabs likely won’t work effectively but they have modified after discussing.
Unfortunately the revision won’t be with this delivery.
I will work with what I receive for now

Taranis · « **Reply #2 on:** September 02, 2019, 07:26:45 pm »

Today the first set of revised parts for the original drives have arrived.
These include a redesigned larger steering nozzle of 20mm diameter.
A revised bucket to suit that with a better angle of deflection in reverse
A very nice intake grill
A first attempt at the trim tab which we know already is a misunderstanding and the new one is in production already for new orders.

The revised bucket and the trim tabs are also made so that you can choose to operate them left or right handed. likewise the steering arm.

Having studied the parts my first conclusion was that due to the GRP hull being relatively thinner that the original drives were designed for we now have a situation where the distance between the internal and external parts is too great.

Easiest solution is to shim this and as it happens we need something for the Nozzle assembly to screw to from the outside.
So from 2mm styrene I came up with this (ocean works will eventually include the solution)

Out of sequence but this is the goal. The adapter shim has been fixed in place with 5 min resin whilst the drive unit was dry fitted inside to align it accurately.
Then removing the drive unit before it became stuck.
I then pilot drilled all the 8 fixing holes from the outside with an archimedes drill and a 1.5mm bit followed by tapping them 2mm and opening the nozzle housing holes up to 2mm

Taranis · « **Reply #3 on:** September 02, 2019, 07:35:30 pm »

I will cover a procedure for marking and cutting the hull later but for now some more pictures

The all important revised trim tab attachment

Taranis · « **Reply #4 on:** September 02, 2019, 08:00:07 pm »

So back to the opening post.
When I first looked at these I wondered how I would mark the hull openings.
My wife has one of those ink pads in a tin

I then carefully cut that out and checked it on one of the drives first

This measurement of 130mm would now be 132mm due to my previous two posts

Self explanatory

Taranis · « **Reply #5 on:** September 02, 2019, 08:08:36 pm »

Screws for the grill are not included so you must find your own solution.
I happen to keep a good stock of stainless steel parts so I will use these M2 x 6 countersunk screws

I've assembled here with the intention of supergluing each nut one at a time then removing the grill for installation.
The nuts will then be encapsulated in epoxy when bonding to the hull

I will take one screw out and use slow CA on the nut face then put the screw back to align it and remove before the screw gets stuck too (repeat 10 times)

Taranis · « **Reply #6 on:** September 03, 2019, 12:22:47 am »

CA was a fail on reinforced nylon so reverted to 5 min epoxy for the nuts

Marked up for 5 min resin

Once glued in I found the two centre line holes then drill through the rest

I then used 30min resin and glass cloth around the inside

Servo rods all bent to suit confined spaces

Temporary trim tab fitted just to align for rods and servos

Quality and no trimming of any parts necessary

RST · « **Reply #7 on:** September 03, 2019, 12:54:07 am »

CA shouldn't really stick to nylon. Not much will by the fact it's a very low surface energy material, ive done it with special ioniising primers, then industrial adhesives. George Foreman will be proud of you though, sausages apparently don't stick to any of his grills either! Grilles are a different story.

Taranis · « **Reply #8 on:** September 03, 2019, 08:19:36 am »

It’s an age thing Rich

FYI Facebook is full of Grill'rs

A thought occurred overnight
Sometimes despite being stainless steel the socket head screws can be a bit soft and small Allen keys can slip.
I’m going to order a batch of torx heads to replace them
long term

P.S. I said no trimming of parts necessary. There is the exception of trimming the intake housing flush with the hull. Sanding is very laborious on Nylon so I used my mini plane to great effect

dpbarry · « **Reply #9 on:** September 03, 2019, 10:18:15 am »

Hi Andy.

Looking good

Great reading on all the threads (Yourself and Kim) and taking notes.

When you mate up the outer and inner section of the drives through the hull, are they held together with the 8 hexagon style bolts?

Declan

Taranis · « **Reply #10 on:** September 03, 2019, 10:33:45 am »

The inner unit is fixed with resin and the outer unit is screwed through to the adapter shim plate I made

Taranis · « **Reply #11 on:** September 03, 2019, 12:24:45 pm »

Hi again Declan, I was a bit hurried this morning so here is a clearer pair of images to answer your question better.
Also at the same time the now fixed in place servo mount that can be removed with just 2 screws via the centre hatch.

From the outside showing the 8 M2 screws
Also note the fixing points for the trim tabs that are no good. These will be cut off when I have the new versions.

Have yours arrived yet???????

Taranis · « **Reply #12 on:** September 03, 2019, 03:07:34 pm »

Ongoing development today as well as working on the second drive.

OceanWorks having seen this will likely make a Nylon part for future

This picture shows how little servo rod travel is required between stops.
The upper black marks on the rods are steering and the lower the reverse bucket

These are the two screws that allow the whole assemble to be moved forwards and out

I've concluded today that I will not be cutting another access hatch

Taranis · « **Reply #13 on:** September 03, 2019, 03:30:15 pm »

This is how they will work when complete

Martin will you add HTML tags please will report to moderator

TugCowboy · « **Reply #14 on:** September 03, 2019, 03:45:13 pm »

Absolutely loving seeing these being used, the more options for stuff like this we have in the hobby the better.
Please keep the updates coming.
Alex

Taranis · « **Reply #15 on:** September 03, 2019, 03:54:14 pm »

Quote from: TugCowboy on September 03, 2019, 03:45:13 pm

Absolutely loving seeing these being used, the more options for stuff like this we have in the hobby the better.
Please keep the updates coming.
Alex

Have you looked at their tug drives Alex

Martin (Admin) · « **Reply #16 on:** September 03, 2019, 05:27:48 pm »

Sounds Great!

How did you link the the Trim tabs to speed?

Taranis · « **Reply #17 on:** September 03, 2019, 05:58:12 pm »

Quote from: Martin [Admin] on September 03, 2019, 05:27:48 pm

Sounds Great!

How did you link the the Trim tabs to speed?

Basically it's a mix of channels like flyers do. I could not possibly recall how I did it as it took many hours of reading about open TX software

Mark T · « **Reply #18 on:** September 03, 2019, 06:31:33 pm »

That is amazing

Taranis · « **Reply #19 on:** September 03, 2019, 06:33:22 pm »

Quote from: Mark T on September 03, 2019, 06:31:33 pm

That is amazing

Anyone who flies an RC plane would say child’s play

Taranis · « **Reply #20 on:** September 03, 2019, 10:48:55 pm »

End of day and unlikely to post for some weeks now as I go on tour

I've reformed both steering rods to avoid any clashes at extremes of movement

Taranis · « **Reply #21 on:** September 04, 2019, 05:32:55 pm »

I had a bit more time today than expected so had a bit of a play around with the parts.
I made some threaded female servo rod connectors for starters. To make it easy to unbolt and withdraw the jet nozzles I need to be able to take everything off the main rods and this is now easily done by disconnecting from the servo arm and unscrewing the extension

Plenty of room and access is pretty good

RST · « **Reply #22 on:** September 04, 2019, 05:44:14 pm »

Amazing how small the parts look in there. Almost lost! Are you taking any bets on which item will still end up difficult to get to? There has to be one at the end! Might you need some form of stabilising bearing or loop mid-point on those rods in addition though?

The jet drives do look tasty. Nice finish on them and nice stay clean material. LoL

Taranis · « **Reply #23 on:** September 04, 2019, 05:50:04 pm »

The servos are smaller than full size ones.
From experience with my Speedline and my design those rods will be absolutely fine and actual travel is quite small. I already fitted a secondary support for the rods too, also there is no resistance in the moving parts.
The access to the motor coupling grub screws would be the difficult but not impossible job.
As I've discussed with Andy Griggs there is plenty of room for even a big hand to get in and the four small hatches serve as viewing points for what fat fingers are doing

I'm thinking of fitting flexible extension tubes to the grease points

Taranis · « **Reply #24 on:** September 04, 2019, 06:42:43 pm »

Anyone interested in how I made the couplings?

I had to think on my feet as brass barrels are non existent here and China Ebay is a long wait

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Author Topic: OceanWorks Jet drives for 1:12 scale Shannon Lifeboats (Read 42858 times)

RST

RST