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Author Topic: Robbe Seawolf - Static Dive conversion  (Read 19057 times)

essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #50 on: June 07, 2013, 10:18:39 AM »

not at all..... I already have the next 3 builds planned


A Revell VIIC with the Norbert Bruggen conversion kit
And 2 others in the planning stage
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essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #51 on: June 14, 2013, 01:55:54 PM »

Well the rack has been modded I have done away with the front planes entirely so the servo has been removed for now.  the extra holes in the front cap have been filled with a generous helping of epoxy and the larger central bolt hole had been epoxied with a suitably sized washered nut & bolt to help fill the void.
I have fitted the bayonet rings and glues them in place (again plenty of epoxy).  Once these have gone off fully I will wrap the join in plasterers tape and skim with epoxy



That should stop the "xxxxx" leaking  {-)
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Re: Robbe Seawolf - Static Dive conversion
« Reply #52 on: June 14, 2013, 10:35:03 PM »

Sounds good. Give the epoxy plenty of time to fully cure right through before even showing it the water. You're on the right track now.

If you decide later on you really must have the front planes- and in this model I don't think you'll miss them- you can always add them in via a linkage from the rear cap. Unless you a have A1 access to the front, it's best not to put any seals or linkages there because sods law says they'll be the first to pack up.

essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #53 on: June 15, 2013, 10:38:06 AM »

Do have a minor problem.... the endcap moved (poor supporting on my part  :embarrassed: ) when I glued it to the tech rack so its not square.  Now to figure out how to debond stabilit express
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Re: Robbe Seawolf - Static Dive conversion
« Reply #54 on: June 15, 2013, 12:01:11 PM »

Ooops! Good luck with debonding Stabilit, you'll have to cut it off I'm afraid.

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Re: Robbe Seawolf - Static Dive conversion
« Reply #55 on: June 15, 2013, 12:38:36 PM »

Ooops! Good luck with debonding Stabilit, you'll have to cut it off I'm afraid.


That's what I was afraid of! Its in an akward place to get to as well  >:-o


At least I can say hand on heart that the rack is firmly attached to the endcap!
I have sent Mr StarLoc (he seems to be knowledgable when it comes to all things sticky) an email to see if he has any thoughts
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Re: Robbe Seawolf - Static Dive conversion
« Reply #56 on: June 15, 2013, 04:47:57 PM »

Well if anyone knows it will be him. If he suggests anything practical let us all know, the only way know of releasing a resin bond once cured is to apply heat or extremely severe chemicals, either of which will destroy the plastic parts they're bonded to, so only really works with metal parts.

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Re: Robbe Seawolf - Static Dive conversion
« Reply #57 on: June 15, 2013, 05:02:18 PM »

It never rains but it pours.... in my attempts to seperate the parts, I have managed to bend the stuffing tube and propshaft, and while attempting to remove the stuffing tube from the gearbox gearbox I have broken the gearbox casing  >>:-(


I did get them separated tho!



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Re: Robbe Seawolf - Static Dive conversion
« Reply #58 on: June 16, 2013, 10:49:36 AM »

As you have knackered the original drive shaft and gearbox, this is an opportunity to upgrade the last remaining part that can be a potential source of trouble.

The original design uses a system designed for surface craft. No shaft seal is present, and it relies on a grease packed stern tube to keep out the wet stuff- not the best solution for a model submarine.

What you could do is purchase a shaft system designed for sub use. The drive set-up used in the Lafayette and 212 will work perfectly in the Seawolf (similar size boat, and prop diameter). It uses a direct drive low RPM (about 5000RPM at 12 volts) 500 size motor on an aluminium mount which screws into the bulkhead, with a 4mm simmering shaft seal. The motor is fixed to the shaft with a direct coupling, and a DU bearing (bronze backed PTFE- self lubricating in water) is bonded into the stern to support the shaft at the other end.

A low friction, easy to service set-up, largely maintenance free, just add a dab of silicone oil or vaseline on the shaft seal now and again.

You may be able to reuse the existing 500, however if it is designed with a gearbox, it will probably be too high revving used direct drive.

essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #59 on: June 16, 2013, 11:14:23 AM »

As you have knackered the original drive shaft and gearbox, this is an opportunity to upgrade the last remaining part that can be a potential source of trouble.

The original design uses a system designed for surface craft. No shaft seal is present, and it relies on a grease packed stern tube to keep out the wet stuff- not the best solution for a model submarine.

What you could do is purchase a shaft system designed for sub use. The drive set-up used in the Lafayette and 212 will work perfectly in the Seawolf (similar size boat, and prop diameter). It uses a direct drive low RPM (about 5000RPM at 12 volts) 500 size motor on an aluminium mount which screws into the bulkhead, with a 4mm simmering shaft seal. The motor is fixed to the shaft with a direct coupling, and a DU bearing (bronze backed PTFE- self lubricating in water) is bonded into the stern to support the shaft at the other end.

A low friction, easy to service set-up, largely maintenance free, just add a dab of silicone oil or vaseline on the shaft seal now and again.

You may be able to reuse the existing 500, however if it is designed with a gearbox, it will probably be too high revving used direct drive.






You know what! I had exactly the same thought and have just been measuring up!
I have an engel glanded motor mount in the bits box
http://www.engel-modellbau.eu/catalog/product_info.php?cPath=108_189&products_id=1135

Plan is to drill out the endcap and feed the mount through.... the shaft from the old gearbox is bent at the gear end the rest is straight (Tested on a sheet of glass) so can be cut down to fit.  As the motor will now be closer to the encap this shouldn't be a problem.  If not a new propshaft is only a few pounds

I also have a nice slow revving 555 motor that will fit nicely

So the plan is
1 open out the endcap propshaft hole to accomodate the motor mount
2 make a mounting plate to fit inside the encap..... this will give a flat surface to fit the motor mount.  This will also need to be removable for motor maintenance
3 Make up some rails from 5x5mm styrene to reinforce the tail section as the prop shaft tube was part of the structure of the tail section

Thank fully I have all the parts to hand so it'll be much cheaper than a new gearbox

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essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #60 on: August 31, 2015, 10:27:34 PM »

2 years on and I opened the box on this again today.....
I deviated from the plans and started making some mods to the rear end just after the last post.  Now looking at what I did I have no idea what I was thinking lol.


Pica to follow tomorrow
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essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #61 on: September 05, 2015, 01:54:56 PM »

Managed to figure out what I was doing


Pics to follow later today!
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Re: Robbe Seawolf - Static Dive conversion
« Reply #62 on: September 05, 2015, 06:39:04 PM »

The old propshaft outlet was opened up to acommodate an Engel Motor mount



I bonded a couple of M3 screws to the mount then bonded the mount to the endcap



I do still need to run some more Stabilit Express round the outside of the propshaft mount thing, a bit of belt and braces.


A motor mount was then fabricated from plastic and screwed to the motor



The motor then fits to the endcap with 4 nuts.



Test fitting the tail section



I need to glue the prop shaft support tube into the plastic support.  The Kit design had an integrated propshaft/gearbox/motor mount that I manage to break and replacements are stupidly expensive.
Once this is all glued/screwed together I will decide if further reinforcement in needed


Couldn't resist fitting the prop




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Re: Robbe Seawolf - Static Dive conversion
« Reply #63 on: September 05, 2015, 06:47:40 PM »


Looking Good!   :-))
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essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #64 on: September 05, 2015, 06:55:31 PM »

Thanks, It's getting there. I think i have now addressed all the weak points of the kit seawolf :)


The problem I have now is that the tech rack has been chopped and changed so many times now that I'm starting to think I should rebuild it.


For now I just want to get it wet tested, so the old tech rack will stay for now, but I  do intend to make a custom rack later on
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Re: Robbe Seawolf - Static Dive conversion
« Reply #65 on: September 05, 2015, 11:17:18 PM »

Should have a good boat there once finished.

essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #66 on: September 05, 2015, 11:54:30 PM »

That's what I'm hoping :)
More work on it tomorrow:-
Refit the bellows and control rods so I can do a wet test
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Re: Robbe Seawolf - Static Dive conversion
« Reply #67 on: September 06, 2015, 01:27:07 AM »

Brilliant work! Looks like a solid solution. Look forward to seeing this finished.
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Re: Robbe Seawolf - Static Dive conversion
« Reply #68 on: September 06, 2015, 01:43:29 AM »

e2v......yes it certainly appears to be a robust conversion :-))....just one question.....does that orange bonding agent adhere to the whitish synthetic endcap casing?.....Derek
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essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #69 on: September 12, 2015, 11:33:32 AM »

ust one question.....does that orange bonding agent adhere to the whitish synthetic endcap casing?.....Derek


Oooooh yes!!! like the proverbial poo to a blanket.
That's stabilit Express.
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Re: Robbe Seawolf - Static Dive conversion
« Reply #70 on: September 15, 2015, 05:22:34 PM »

Neat looking conversion by Pascal.

essex2visuvesi

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Re: Robbe Seawolf - Static Dive conversion
« Reply #71 on: September 15, 2015, 05:35:14 PM »

Very nice.


Well My WTC is water tight now.
And the dive system works


I am however very unhappy with the tech rack as its been modified, and then the modifications have been modified so it looks messy, so have ordered some more acrylic and going to rebuild it
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Re: Robbe Seawolf - Static Dive conversion
« Reply #72 on: September 15, 2015, 05:57:35 PM »

PVC sheet is very much easier to work, and usually cheaper, but acrylic will do the job.

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Re: Robbe Seawolf - Static Dive conversion
« Reply #73 on: September 16, 2015, 09:24:54 AM »

PVC sheet is very much easier to work, and usually cheaper, but acrylic will do the job.


Like this?
http://www.directplastics.co.uk/acrylic-sheet
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Re: Robbe Seawolf - Static Dive conversion
« Reply #74 on: September 16, 2015, 10:15:07 AM »

They do PVC sheet too, and it's cheaper. the advantage with PVC is it isn't brittle, so you can cut it quicker, and no risk of shattering.

Having said that acrylic comes in different grades, and some of it can be remarkably tough.
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