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    LA class semi kit.

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    Tom(ADMIN)
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    LA class semi kit.

    Post  Tom(ADMIN) on Thu Jan 13, 2011 11:53 am

    I have an LA class kit on the way...


    Last edited by Richard(Admin) on Sat Jul 16, 2011 9:29 am; edited 2 times in total
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    david f
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    Re: LA class semi kit.

    Post  david f on Thu Jan 13, 2011 12:26 pm

    I am pleased to hear that "Richard's shipyards" are still working at a prodigious rate!

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Thu Jan 13, 2011 6:11 pm

    Well, thank you kind sir...the Gato is now on the back burner for a while, and the LA will be in first place on the slipway.


    Last edited by Richard(Admin) on Tue Jan 18, 2011 9:44 am; edited 1 time in total

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Fri Jan 14, 2011 5:48 pm

    Made a start on the wtc for the LA today...




    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Sat Jan 15, 2011 11:01 am

    And the proposed equipment layout in the hull..ballast tank at c of g, balanced out by the forward mounted gel cell and the wtc.

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    andyn
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    Re: LA class semi kit.

    Post  andyn on Sat Jan 15, 2011 12:47 pm

    So as you know Rich, the absolute maximum width of the tank is 126mm (yes I've tried) and the opening is 114cm long.

    It's a fantastic set of mouldings, you'll love it...

    Here's where I am with mine (note the deck doesn't sit in right yet, got a little more sanding to do) When I get the shaft from Mark, it'll probably be finished in a couple of days after.



    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Sat Jan 15, 2011 1:18 pm

    Plenty of room in there for what I have planned...what do you have to do to get the deck to fit the hull Andy?
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    andyn
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    Re: LA class semi kit.

    Post  andyn on Sat Jan 15, 2011 1:36 pm

    Get the dremel out with the sanding drum on it, and sand down the lip on the lower half of the hull. Seeing as your tube will fit right in that should be about it, but I'm going to have to sand some out of the hull and deck too. Purely because my Sheerline tank is so big...

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Sat Jan 15, 2011 1:46 pm

    Don't possess a Dremel, so it'll be down to using the good old file and glasspaper...

    My wtc is 3.5" diameter(OD)for the main cylinder and 3"(OD)for the ballast tank, so I don't think I'll have trouble fitting that into the hull..I hope.
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    andyn
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    Re: LA class semi kit.

    Post  andyn on Sat Jan 15, 2011 2:17 pm

    It's gonna take you ages then mate.... I wouldn't use a file personally, you'd be better off with a sanding block and about 80 grit...

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Sat Jan 15, 2011 2:31 pm

    andyn wrote:It's gonna take you ages then mate.... I wouldn't use a file personally, you'd be better off with a sanding block and about 80 grit...

    You've just cheered me up no end...maybe if I ask Mark nicely he'd trim it for me before he posts it off.

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Mon Jan 17, 2011 1:41 pm

    I asked Mark ever so nicely, and after promising to buy him and Angie lunch at Brighton Show, he's going to trim the hull for me and get it to a stage where the deck fits the hull without needing any further work.

    So, whilst waiting for the postman, I've done some more to the WTC...made up a power distribution board and tidied up the wiring as much as possible.




    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Mon Jan 17, 2011 6:29 pm

    And here's the WTC, all tidied up and just awaiting the installation of the esc for the motor, esc for the ballast pump, an auto leveller and a fail safe.
    The ballast tank is practically finished, just need to make and install the internal baffles.



    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Tue Jan 18, 2011 10:37 am

    And here's the ballast tank with two internal baffles fitted. The baffles are cut from 2mm black styrene sheet, each one has three 6mm holes drilled through to allow water to pass through without impeding the flow, but slowing it enough to stop any unequal filling of the tank, and hopefully allowing the boat to submerge on a level plane.



    And this is the drawing I came up with to show the shape of the baffles.

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    Wheelerdealer(Ramesh)
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    Re: LA class semi kit.

    Post  Wheelerdealer(Ramesh) on Tue Jan 18, 2011 1:40 pm

    Is the water level going to be any higher than the top of the baffle? Its the sloshing of water when the tank is 'full' when you're underway that causes problems.


    Last edited by Wheelerdealer(Ramesh) on Tue Jan 18, 2011 6:41 pm; edited 1 time in total

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Tue Jan 18, 2011 1:56 pm

    Good point...I hadn't allowed for that factor. I'll add a top baffle, hopefully that should cure the problem...says he with fingers firmly crossed.
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    david f
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    Re: LA class semi kit.

    Post  david f on Tue Jan 18, 2011 10:19 pm

    I agree with that.
    The baffles are best going all the way up, I think.
    I don't even bother to drill holes in the baffle because with my workmanship the water leaks round the sides!

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Wed Jan 19, 2011 8:07 am

    Fair comments...I'll add a further baffle mounted on the top of the tank and coming down between the existing two.

    Thanks chaps..




    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Wed Jan 19, 2011 9:42 am

    How's this then, chaps...any better?





    No sooner done than said...
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    acrowot (Geof)
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    Re: LA class semi kit.

    Post  acrowot (Geof) on Thu Jan 27, 2011 4:31 pm

    Hi to everyone
    my name is geof and this is my first post here and what a great site.
    I have been modelling for nearly 30 years started with boats (which I still had in the loft and have gotten back into through my son who is nearly 7 )then model aircraft which has been my main part of modelling since.
    Since I have been sailing my boats a round Bushy Park the old dream came alive once more
    When I was 12 I went to the model engineer exhibition with 2 friends there we sore the AMS.
    There some one had a small dynamic fun sub witch hooked are imagination so home we went in top secret we designed 3 subs mine been one
    The idea of us telling our parents that we were going to send are new 2 channel radio gear under water did not sound like a good idea
    So the design was from a 12 year old all 3 subs worked well one did sink with out trace in a gravel pit with all servos on board (his dad was not the happiest man around)
    As we were 12 are designs was floored all were made of balsa thinking this would be easier to cut we did not like the idea cutting all the bits out of ply with a junior hack saw.
    So mk11 of mine was designed and has worked perfect made out of ply based on a square box
    It is now in for a refit trying to fit a ballast tank and a car tyre compressor so far so good but running out of space.
    So to the topic i have promised myself a proper model sub for my 40th birthday in july and I have come across this thread and the LA looks great and seems quit straight forward in construction and at a very good price I believe that MMB can supply wtc end caps and the link that has been added in useful links for the clear tubing http://myworld.ebay.co.uk/clearplasticsupplies&ssPageName=STRK:MEFSX:SELLERID
    It cost just over £20 for a 1 meter length and 90mm in diameter I feel it is a lot cheaper than the Robbie U47 £340.00 for the standard kit and I will learn a lot more from the LA.
    Would you guys be happy in explaining in more detail about your blast systems i.e. is it a water pump compressing the air in the tank and how you are building it and electronic equipment used the reason I ask is the old up scope articles from the mid 1980s that I have in a folder at home may be out of date
    One question do you use the main 6-volt battery to run the radio gear
    Sorry for my rambling if any one is looking for old up scope articles from the mid 1980s including torpedoes loss I may be able to help.

    Many thanks geof


    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Thu Jan 27, 2011 5:09 pm

    Hello Geoff,

    My LA arrived today, alas damaged in transit, so Mark is making me another deck for it. It's sure a strong hull, there's no way this baby will deform!

    My ballast system is a sealed system, I use a reversible screen wash pump to pump water into a sealed ballast tank to submerge down to decks well awash, and then dive using the rear planes and a touch of forward power..to surface I just reverse the pump and up she comes. I like it, it's a simple system to build, and there is the element of positive bouyancy which will bring the boat up eventually if there's a problem.

    I use the main power battery (a 6volt 4amp gel cell)to run everything...pump, main motor, radio, the lot. People tell me I should fit a BEC to drop the power down to the rx to 4.8 volts, but I've never blown anything yet, and because the battery is out in the free flood area it's easy to change it when it starts to drop off in power.

    As for electronics, I use an Action Condor esc for the main motor, another to control the ballast pump, a six channel HiTec Optic 6 radio, 2 MMB micro servos for rudder and rear planes, and an auto leveller as well on the rear planes. The radio has a built in fail safe which is handy...
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    david f
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    Re: LA class semi kit.

    Post  david f on Thu Jan 27, 2011 7:50 pm

    Hi Richard,

    I would suggest full height baffles - you really want to reduce sloshing.

    Try filling it 3/4 with water and try tilting it. You want to delay the slosh by a good second or two.

    (I'm getting sloshed.)

    Welcome Geoff! Have you looked at the description of dive systems on our main website? Also our manual, available free when you join the AMS. Only £12 per year membership. Nudge! Nudge!

    Tom(ADMIN)
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    Re: LA class semi kit.

    Post  Tom(ADMIN) on Thu Jan 27, 2011 7:57 pm

    david forrest wrote:Hi Richard,

    I would suggest full height baffles - you really want to reduce sloshing.

    Try filling it 3/4 with water and try tilting it. You want to delay the slosh by a good second or two.

    I'm not that far short of that target, David...at 3/4's full the water does get held up by the three baffles quite a lot.

    (I'm getting sloshed.)

    Welcome Geoff! Have you looked at the description of dive systems on our main website? Also our manual, available free when you join the AMS. Only £12 per year membership. Nudge! Nudge!

    High pressure sales technique coming in there...

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    acrowot (Geof)
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    Re: LA class semi kit.

    Post  acrowot (Geof) on Thu Jan 27, 2011 8:32 pm

    Hi Richard
    Many thanks for getting back to me sorry to hear about the deck and hope you can get back to the LA soon.
    Do you think I could build the wtc and ballast tank from 90mm diameter clear pipe instead of 90mm wtc and 75mm ballast tank and buy 4 wtc end caps from mmb to seal of the wtc and ballast tank.
    For your ballast pump is this a 12 volt motor car windscreen pump and do you change the motor to 6 volt
    When you fill the ballast tank up how much pressure does this build up
    In your post you made reference to using a bec to reduce voltage I fly electric aircraft only up to 9 pound in weight spitfires
    i all ways use 6 volt bec or 5 cell receiver packs were i can the only thing that restricts me some times is the servos as long as the servos can handle 6 volt there should not be a problem.
    On spectrum we use 6 volt all the time as brown outs were a problem a few years ago and the plane then went into fail safe due to low voltage on 4.8 volt if a servo staled in flight due to high loads

    Sorry about all the questions thanks again geof
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    acrowot (Geof)
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    Re: LA class semi kit.

    Post  acrowot (Geof) on Thu Jan 27, 2011 8:54 pm

    Hi David

    i have looked at the systems on your main site and all starting to make sence the problem is were to get some parts and trying to find the best way of doing things
    many years ago i started making a HMS resolution from scratch as my building at the time was slower than it is now things kept changing from this idea to that idea drove me mad now i look at it my building skills were not great ether made a bannana tail cone on the back
    if i could find a way of sealing it up i may give it another go
    I made the preasure hull from a 4 inch drain pipe like the robbe u boats with wooden end caps for the wtc at each end a trip to B&Q may be in order see if i can find something
    This was to have a car tyre compressor and solid ballast tank in the middle then i started to run out of space so i needed a smaller compressor and so the problems kept building up now sitting up in the loft
    this sub was a first for a lot of things first static diver made the moulds all by my self and so on all back in 1987

    as i keep asking a lot of question i shall find the application form and send it to you with some money

    many thanks and all the best geof

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