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Author Topic: X9 ...  (Read 10324 times)

U-33

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X9 ...
« on: April 22, 2015, 08:13:33 AM »

Well, here you go boys n' girls...X9 is completed, just awaiting the module from Ron Perrott, and then she can be fitted out.




(damn...just noticed I didn't attach the White Ensign...)
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Rich

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Re: X9 ...
« Reply #1 on: April 22, 2015, 09:18:53 AM »

Sweet :-))
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U-33

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Re: X9 ...
« Reply #2 on: April 22, 2015, 10:48:57 AM »



Well, thank you kindly, Oh Wise One.... ;D
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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Subculture

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Re: X9 ...
« Reply #3 on: April 22, 2015, 12:54:32 PM »

Dynamic or static diving module?

U-33

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Re: X9 ...
« Reply #4 on: April 22, 2015, 01:00:29 PM »

Dynamic dive, Andy...there's so little freeboard on the X craft that you'd only have to sneeze and it will submerge.
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Rich

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

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #5 on: April 29, 2015, 11:57:32 AM »

Just had a long chat to Ron Perrott, had a change of plan with X 9. Instead of having her as a dynamic dive boat, Ron is building a full on static dive system for the boat. If it's worth doing...it's worth doing it properly. It'll be a much better boat in the end.

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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

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Re: X9 ...
« Reply #6 on: April 29, 2015, 01:48:44 PM »

You still coming to Wicksteed Richard
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U-33

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Re: X9 ...
« Reply #7 on: April 29, 2015, 09:10:09 PM »

Hopefully mate...with a bit of luck and a following wind, we'll be there.
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #8 on: May 14, 2015, 08:05:21 AM »

Here we are, boys n' girls... the module for X9, custom designed and built by Ron Perrott.It's a really clever piece of work, and beautifully constructed.

610mm x 80mm diameter, with an internal ballast tank, full static dive.

Thanks Ron...much appreciated.
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #9 on: May 21, 2015, 11:35:57 AM »

Sub-Lt. E. Kearon, RNVR, has arrived, he's going to be displayed on the deck of X9 when she's on show.
He was lost with the rest of the passage crew when X9 was lost in heavy seas whilst under tow from HMS SYRTIS, on her way to Norway as part of Operation 'Source', the attack on the Tirpitz.

Some interesting reading here:
http://www.ibiblio.org/hyperwar/UN/UK/LondonGazette/38204.pdf
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #10 on: June 27, 2015, 08:48:46 AM »

Made a start on installing the module...as you'd expect from Ron, it fits perfectly. Under the tube is a 300mm length of 15mm diameter stainless steel rod, fitted into the keel, and there's ample room either side to take some lead sheet.


(thanks to my old mate Andy (tattooed) for the s/s rod and the lead)
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Rich

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

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

george

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Re: X9 ...
« Reply #11 on: July 01, 2015, 01:56:47 AM »

Hello

 Could you send me a link to Mr. Ron Perrott? I would like to get information on his WTC that he built for your X9 Static divier.

 Thanks for your build log, it helps with mine.

 George
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U-33

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Re: X9 ...
« Reply #12 on: July 05, 2015, 01:11:46 PM »

X9 update...the module is now installed, prop shaft hooked up and prop tube support made and fitted (that was interesting trying to hold everything in the right place up in the confined space in the stern)
Just waiting on a pair of smaller servos to arrive, the ones I originally fitted were a touch too big, then I can install the rudder/plane linkages, these are already made up (thanks to Andy (tattooed) for the wire)


Very nearly ready for ballasting and trimming...fingers crossed she will make her maiden voyage at the Norwich Sub Weekend.
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Rich

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

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #13 on: July 06, 2015, 02:50:53 PM »

New linkages are now installed, still waiting on the new servos to turn up.
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Rich

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

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

U-33

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Re: X9 ...
« Reply #14 on: July 07, 2015, 02:13:59 PM »

And the good news is...the module is now fully fitted out and everything works as it should. It's been in the bath, weighted down with two sheets of lead for a good half hour, and when I took it out, it was as dry as a bone...not a dribble of water anywhere.
Next is to install it in the hull and get it ballasted.
With grateful thanks to Ronald Perrott for making it for me...thanks Ron, I appreciate that tremendously.

The length of threaded rod you can see is bonded to the tube, and goes up through the deck, an M4 brass nut screws onto it and secures the deck to the hull.
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

george

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Re: X9 ...
« Reply #15 on: July 08, 2015, 02:41:04 AM »

Hello U-33

 Thanks for posting this and to confirm, this is a dynamic diving X Craft with Ron`s WTC built cylinder?

 Also the link to Ron in your last post comes up as non working for facebook.Can you help, I would like to get in touch with him for my X Craft build.

 Thanks Rich

 George
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Re: X9 ...
« Reply #16 on: July 08, 2015, 07:43:58 AM »

Sorry to but in but ........the link to Ron on Facebook is working from my end it may take Ron a day or two to get back to you he can be busy at times

Mark
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U-33

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Re: X9 ...
« Reply #17 on: July 08, 2015, 08:12:02 AM »

Thanks Mark...Ron is very busy at the minute, but give him time, George...
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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Subculture

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Re: X9 ...
« Reply #18 on: July 08, 2015, 05:47:21 PM »

You'd be well advised to build the wtc without a ballast system to start with. X-craft work very well as dynamic divers as they have very large hydroplanes, so you have plenty of control, just trim the boat a bit lower than you would for a static diver e.g. decks awash, and you'll only need a whiff of throttle to dive.

Make the tube large enough to accommodate a ballast system later on, I would say a 10-11 ounce tank would be quite sufficient for a model this size.

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Re: X9 ...
« Reply #19 on: July 09, 2015, 12:02:59 AM »

 Hi Subculture

 Thanks for the reply BUT I have collected ALL the parts needed and I was hoping to build the WTC with the desire to make my XCraft a Static diver.

 What I am unsure of is the overall size of the WTC and it`s compartments. Could you help me with that?

 George
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Subculture

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Re: X9 ...
« Reply #20 on: July 09, 2015, 10:49:17 AM »

In all fairness, you can buy all the parts you like, but if you haven't got a grasp of core principles, you run into difficulties when putting them together to make a working sub.

Those principles have been covered many times before. Back catalogue of SCR's, Norbert's book on sub technology, plus a few online articles.

When figuring out WTC and ballast tank size, it's really useful to have a working knowledge of Archimedes principle with regards to displacement, densities of various materials. When working with ballast systems, especially those that compress air inside rather than vent externally, you should also understand how volume alters with pressure and vice versa (Boyles law). e.g. halve the volume double the pressure.

A WTC should be large enough to provide buoyancy for the tube weight itself plus all the equipment you put inside it. In addition, allowance for ballast in the keel and remember that glassfibre hulls are denser than water by about 30-50%, dependent on the glass content in the laminate.

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Re: X9 ...
« Reply #21 on: July 10, 2015, 02:45:14 AM »

Andy,
Do I see the next video you can do! How many times does the topic come up?
Peace,
Tom
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Re: X9 ...
« Reply #22 on: July 10, 2015, 02:48:30 AM »

Hello Again

 I would Second that video request. I learned a lot from the first one. Look forward to watching the video.

 George
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Subculture

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Re: X9 ...
« Reply #23 on: July 10, 2015, 11:44:56 AM »

it would involve quite a lot of work to make videos showing these things, and it would still only show one example.

I think perhaps I should ask some questions of those asking the questions, to test current level of knowledge.

1. What empirical method can we use to find out the ballast tank volume required for any model submarine, assuming we have an adequately sized test tank to put it in?

2. A WTC is 8cm in diameter and 20cm long. What is its displacement in litres?

3. How much weight in kilograms can that cylinder support?

4. What is the average density of fresh water, and by how much does it vary in density in percentage terms?

5. If I compress air from a 500ml ballast tank into a 1000ml reservoir, what will be the pressure in bar or psi.







Subculture

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Re: X9 ...
« Reply #24 on: July 10, 2015, 11:51:54 AM »

BTW, I will accept answers in imperial units for those uncomfortable with metric. It's 2.54cm to the inch, and 61 cu inches to the litre. 1 bar equals 14.5 psi.
 
Also I've noticed that we are getting far off topic, and the subject matter is now hijacking Richard's original thread. Perhaps the mods can shift some this to another topic, perhaps titled something like e.g. Ballast systems and WTC theory.
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