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Author Topic: Salt Water Darnell U37  (Read 54916 times)

RAAArtyGunner

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Re: Salt Water Darnell U37
« Reply #175 on: August 12, 2015, 03:15:38 am »

Some say I am a slow builder...to them I say "Tune in next year for my stinging rebuke of your accusation!"

Why so soon, ignore them and take your time replying :-)) :-)) %) %)
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #176 on: August 12, 2015, 05:26:23 pm »

I tried buffing up the sub..all that happened was a Genie appeared and granted me three wishes!
None of my wishes came true..so it was out with the paint brush again :-)

But first..more photos of filler and a ruined paint job. Plus a half built SS Ohio and a partly Unbuilt Nautilus!
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #177 on: August 12, 2015, 05:35:21 pm »

So with big matt patches all over the sub, none of which I could buff up to a suitable match..som lateral thinking was required. I decided to put MORE matt paint on the model!
I have seen some stunning examples of static Type VIIs based on the Revell kits, I decided to shamelessly copy one of these and claim it as my own interpretation..
So here is my interpretation!!!!

I roughly dry brushed ( Damp Brushed!) lighter matt panels in, fore and aft, in an 'up down' pattern, roughly where plating breaks are on the real subs. These seem to be closer spaced towards the extremities of the sub than midships. Probably something to do with the saddle tanks being in the way. This was, admittedly, a bit rough in application. the intention being to fix it further down the line.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #178 on: August 12, 2015, 05:39:16 pm »

Then I got the airbrush out. Couldn't resist it!
Mixing up a Chromate Yellow/Burnt Umber/Lamp Black mix of oil paints, thoroughly thinned to almost nothing with spray thinners, I started to apply it between the newly applied Matt Slate Grey panels..and anywhere else took my fancy.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #179 on: August 12, 2015, 05:43:11 pm »

Then that ran out so I added lots of Raw Umber to this to give me a rust colour. This was oversprayed onto the existing stippled rust along the waterline plus some vertical streaks extending below the waterline ( I once watched a bit of rusty muck roll down the side of an Oberon Class Submarine, and keep going below the waterline..I lead an exciting life :-)) ).
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #180 on: August 12, 2015, 05:44:37 pm »

As a happy person now..I have little excuse..must get on with the electrics %)
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U-33

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Re: Salt Water Darnell U37
« Reply #181 on: August 12, 2015, 08:42:14 pm »

Now that looks damn good to me, skip...now leave it alone, don't touch it again, or else I'll bring my Akula down and let you loose on that with your air brush thing.
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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RAAArtyGunner

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Re: Salt Water Darnell U37
« Reply #182 on: August 13, 2015, 03:55:59 am »


In the pics of reply 179, it shows a spiral to the deck gun barrel.

Is that correct and if so do you know the purpose of the 'spiral'?
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salmon

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Re: Salt Water Darnell U37
« Reply #183 on: August 13, 2015, 08:53:42 am »

I believe it is a rope that holds the barrel plug from getting lost.
Look at the 4th photo down on this page http://www.subpirates.com/showthread.php?288-Type-VII-U-boats-reference-photos

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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #184 on: August 13, 2015, 09:14:51 am »

And there is an off cut of cocktail stick as a barrel bung jammed in the end of the barrel.
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Davy1

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Re: Salt Water Darnell U37
« Reply #185 on: August 13, 2015, 10:23:39 am »

Spiral on deck gun?

I think it is more likely to be a fixed item on the barrel to break up the wake and make it less visible.

Without checking any photos and from memory - don't you see the same arrangements on some of the periscopes??

David
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #186 on: August 13, 2015, 12:17:10 pm »

I thought the same until fairly recently, when I found photographic evidence of the barrel plug and securing cable hanging loose.
When you think it through it makes sense having some sort of 'wake dispersal device' on the periscope, not so much on the gun barrel of an '88'. Behind which is the rest of an '88' plus a stuffing great big conning tower. BIG spirals needed to disperse that lot :}
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RAAArtyGunner

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Davy1

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Re: Salt Water Darnell U37
« Reply #188 on: August 14, 2015, 09:02:32 am »

Very good - so it is!

David
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #189 on: April 13, 2016, 06:00:54 pm »

Right. That's it. This sub is getting wet. Maybe not today, maybe not tomorrow, but soon!
Other stuff can wait.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #190 on: April 13, 2016, 06:07:58 pm »

Last week I cleared the decks and started the final fit out with the intention of being in the test tank by last Sunday. First job was to beef up the pinch valve servo. Despite using a heavy duty servo arm, it was still bending out of position, causing a loss of pressure in the rest position. Luckily i know someone with a 3D printer, so could order a heavy duty servo arm beefer upper, cheers Helen!
Fitting this required a bit of fettling as it ended up slightly higher than the original, due mostly to me making a bit of a bodge of the order..
Also while testing over the weekend the Futaba S3003 servo proved to be borderline for the job. Wandering out of position after a few minutes, plus getting warmer than I would like a servo to get in normal use. This has now been replaced with a high torque metal geared servo, all seems to be well at present.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #191 on: April 13, 2016, 06:10:09 pm »

With the Pump Deck out of the sub, I could hook it up to a watt meter and test it, just to see really. Amps were good, voltage held steady. All working well so far.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #192 on: April 13, 2016, 06:14:23 pm »

With all looking good I decided to bolt everything shut and go for a pressure test. Over pressuring everything with five pumps from a bicycle pump ( Yup, five!), then releasing the valve to see what hissed out. Nothing! Tried again, nothing!
It turns out that the twist lock caps I fitted are much better with the O-Ring fitted than with the O-Ring under the Workmate!
Second test held good pressure for thirty seconds, but lost everything over five minutes. This would need a test tank to look for the leaks.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #193 on: April 13, 2016, 06:18:01 pm »

So, with no access to the club test tank till Sunday, it was out with the rust paint, fit the crew and install the salt water antenna.
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #194 on: April 13, 2016, 06:24:07 pm »

Following Sundays leak trials much was discovered;
1) Tighten the nuts up more, it will be fine.
2) One pump of a bicycle pump results in much less leaking than five pumps of a bicycle pump, who'da thunk it %)
3)The water ballast tank is still under lots of pressure when full of water, and slightly soft epoxy wont keep the air in, avoid old epoxy for crucial joints.
4) Everything gets wet testing submarines!!
So, no maiden voyage on Monday then >:-o
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #195 on: April 13, 2016, 06:29:25 pm »

I must say though, the dive system worked, even if it dumped all its pressurized air to atmosphere. The reversible pump still vented the tank and the sub surfaced and dived, very stern heavy though. Such is life.
So, I have spent the last couple of days improving the pipe seals, replacing T-Connectors with better ones, and re-enforcing the end of my ballast tank. This I have done with a mix of 50 year old US of A medical gauze, Z-Poxy and epoxy thickener, rather like plastering a broken leg, only this hopefully wont be coming off in six weeks!
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #196 on: April 13, 2016, 06:32:54 pm »

And while waiting for the epoxy to cure, I trimmed the upper foam block so I could actually see the voltage meter fitted inside the watertight compartment.
That's where we stand today. Should I go back to the test tank on Sunday and trim everything proper like, or risk all with a dash to the local lake, while the sun shines, and have a quick blast around the pond? We shall see :-))
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #197 on: April 19, 2016, 04:53:02 pm »

Following Sundays test tank visit an interesting problem occurred. Using the reversible water pump to submerge, all went well. Upon surfacing, many bubbles could be seen coming out of the vent pipe. Being closed off to thinking this would be a fault, 'brain' here kept surfacing and submerging, looking for air leaks out of the plumbing. After about five dive and surface tests, I could see 'raindrops' along the inside edge of the foam sealing tape. What was happening was that as the pump emptied the water tank, it was also drawing air out of the radio compartment and dumping it into the test tank. After five ups and downs, it had produced a considerable vacuum inside the RC compartment, drawing water IN to the model wherever it could!
I took the pump apart and have now silicone sealed every possible route through the pump from atmosphere inside the RC compartment ( except the motor shaft, couldn't silicone that together!). Tested it yesterday with a bowl of water, no air being drawn through the pump. although the hose did spray me down with water as it went into 'surface' mode :embarrassed: .

As fortune favours the bold, and its quicker to just drop it in the pond than fill up the test tank again, AND the sun is shining....I shall report back tomorrow,
 :-))
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #198 on: April 20, 2016, 05:00:59 pm »

Good news :} ...it didn't leak (any water in...although I still have a small pressure leak to find.). Following about fifteen minutes removing foam bouyancy and testing the main pump, it was time to button the model up and let her go...
There was a small problem with surface targets!
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unbuiltnautilus

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Re: Salt Water Darnell U37
« Reply #199 on: April 20, 2016, 05:04:31 pm »

Trim was pretty good, a little stern heavy still but nothing to worry about on a first run. I tried 10, 20 and 30 second fills on the tank. Having forgotten to time how long it takes to fill up the ballast tank, this seemed the best option. Speed was good on the Pittman motors, turning circle was as expected..pants!
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