Model Boat Mayhem

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Author Topic: seehund  (Read 18990 times)

Guy Bagley

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Re: seehund
« Reply #25 on: August 03, 2006, 02:59:20 pm »

he does some other models as well. got my eye on the DELTA. different.

 its makes up to be an awesome model, check out francis 's delta which is on the main mayhem site( under your models) ,  i have had alot of dealing with this sub his is expertly put together including the CCTV cameras but it is a really extensive and unusual kit -
works exceptionally well too.....
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colin-stevens

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Re: seehund
« Reply #26 on: August 05, 2006, 09:04:24 pm »

wanted to ad dthis bit to a different thread but cant find it, so i'll put it here. just tried Seehund out in the bath. no radio gear or anything, just the two radio boxes and the blood pressure cuff. the hull sat on the bottom of the bath till i puffed up the cuff, result. the interesting thing is that it took very little inflation to bring her up. not nescasseraly good news as i will be relying on a partial vacum to deflate the bag, pulling the air back into the radio boxes, but hopefully by adding weight and blue foam i can ger it to work.
thanks to mankster and ramesh. two very helfull gents. once i get it to work in the bath all i have to do is find some decent water. then the problems realy start.
keep the questions and answers coming.
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Mankster

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Re: seehund
« Reply #27 on: August 05, 2006, 09:17:08 pm »

the interesting thing is that it took very little inflation to bring her up. not nescasseraly good news as i will be relying on a partial vacum to deflate the bag, pulling the air back into the radio boxes, but hopefully by adding weight and blue foam i can ger it to work

If you want your bag to inflate say a futher 50cm3 before the sub surfaces, place 50cm3 of foam under the upper hull (just above the surface waterline).

colin-stevens

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Re: seehund
« Reply #28 on: August 06, 2006, 08:59:28 pm »

can i swear on this site?
fitted the blood pressure pump, sevo,switch and valve into a radio box today. tried it out in the sink. no joy. the bag would not inflate. i reckon the problem is with the size of the box, to f**** small and i am realy P***** of with this damned bloody thing. back to the drawing board ,again. all i can do now is to fit a small tube into the conning tower and connect it to the boxes, maybe pump in some extra air as well.
why on earth did i start this?
the other option is to scrap the boxes and put in tube. trouble is i dont have the facilities to make up water tight caps any sugestions?
i hate this ******************************************** thing.
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Youngat65

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Re: seehund
« Reply #29 on: August 07, 2006, 08:45:50 am »

Patience is a virtue Colin of which you will need a great deal if you into model boating  ;D ;D
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Guy Bagley

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Re: seehund
« Reply #30 on: August 07, 2006, 11:47:19 am »

is this the gummi sac principle ??? you pump water into the bag which makes the model negative bouyancy and hey presto the model dives..... pump the water back out and the model returns to its positive bouyancy and surfaces.... if so is your bag inside the watertight box ????- 

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Youngat65

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Re: seehund
« Reply #31 on: August 07, 2006, 12:08:06 pm »

So that is what the paramedic meant when he said you will be on the old suck and blow for a few days  ;D ;D
                                                                               Cheers
                                                                                      Bob B
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Mankster

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Re: seehund
« Reply #32 on: August 07, 2006, 01:16:28 pm »

You could try running your pump on a higher voltage, it will only be operated for a short time so should be ok. You can increase the air capacity by installing additional boxes or air cyliders and connection them to your main boxes with a flexible tube. Reducing the volume of your upper hull and setlling on a higher surface water line will also help. If you pressurise your boxes with a bicycle pump, you will need a second pump to pump out the air from the bag back into the watertight area as there won' t be a pressure differentional between the bag and the WTC.

Guy Bagley

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Re: seehund
« Reply #33 on: August 07, 2006, 04:50:51 pm »



 am i missing the point ????  i am not sure, but maybe i am confused but if the pump is a peristaltic type when the pump stops there is no leak back, so if you are pumping air or water this one pump will do the job.... it works in both directions and when you stop the pump no matter what the pressure it wont leak 'back' in either direction, you have to operate the pump to get the flow in either direction to work.....
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colin-stevens

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Re: seehund
« Reply #34 on: August 07, 2006, 07:32:37 pm »

unfotuantly the pump only does not suck when in reverse, still blows, and behave yourselves.
thanks again Mankster, save me wasting effort in pumping(behave) but the extra air tank is the way i am going. Boating is easy, sinking them is easy, getting the hatefull things to come back up again is the hard part.
thanks agin for the help, i will solve the thing, it used to have a name, actualy stil does, just not one for polite society.
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Guy Bagley

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Re: seehund
« Reply #35 on: August 08, 2006, 10:53:11 am »

colin, if you pump does not suck in reverse would it not be easier to get one that does ?

the peristaltic ones like the one  engels distribute will suck or blow in either direction,  it will suck in from one side ( say the left) and blow out the other (the right), - reverse the polarity and it then sucks  in on the right and blows out  on the left....
 i use this system in my sub- one pump  less hassle- less space used in model too.....

 i have now found a UK supplier for the pumps too, so dont need to order from engels in germany......plus alot cheaper buying them from the UK supplier....

 if you need more details PM me....i also have photos of my dive system, 
 if space is a premium this must be worth considering.....
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DavieTait

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Re: seehund
« Reply #36 on: August 08, 2006, 12:22:46 pm »

Guy can you PM me the address for that pump please. Sounds like the best pump for the WTC i'll be building too.

Davie
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Guy Bagley

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Re: seehund
« Reply #37 on: August 08, 2006, 12:57:56 pm »

pm sent...............1pm   8.8.06
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petesubman

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Re: seehund
« Reply #38 on: August 08, 2006, 08:11:00 pm »

Try Dave at Pandan/Subtech he has the pump thats runs the rcabs sytem, you know the one that inflates the bag that takes your blood pressure, or put a non return valve either side , of your pump, this will allow air to the bag and wont let back through the pump, with an air micro switch in the circuit, when the bag is fully inflated the switch allows air out of the bag through a third nrv back to the air tank, or just get a pump from Dave it may stop the swearing!!!!!!!!!!!!! at some point, welcome to submarines, Pete
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colin-stevens

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Re: seehund
« Reply #39 on: August 08, 2006, 08:51:13 pm »

got a feeling it will take more than that to stop the swearing. stupid hobby. should never have got sucked in. i'm doooooooomed i tell you, doooomed.!!!!!!!! only just put me toys back in the pram.
just come of the subtech sight, cant find that pump. did find one for water though. is it the same? waiting for the man to get back to me about water tight prop shafts and tubes, found the tubes, but know shafts.
goin very quickly mad
colin
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petesubman

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Re: seehund
« Reply #40 on: August 09, 2006, 12:03:15 pm »

Hi Colin , he doesnt list them, so your going to have to call, or email, Dave also doesnt list several diffrent sizes of clear tube with end caps,or various valves soloniods, and a host of other goodies, he,s very handy to know , he imports these, from Dave Welch in the u.s, or Big Dave, i noticed a couple of posts asking why he wasnt replying to emails, i think there are a couple of big sub shows on at the moment,which  he does attend, regards Pete
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colin-stevens

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Re: seehund
« Reply #41 on: August 09, 2006, 08:56:53 pm »

ta, can see a long conversation coming up with him. good to know he imports from big dave, save a lot of greif as i cant seem to make sense of daves site, or rather what to order. just a cluless old fogey realy.
subtech replied today, got the shafts i want, i hope.
just got to find something to use as the air bag and i will be a happy bunny.
colin
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ambernblu

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Re: seehund
« Reply #42 on: August 10, 2006, 06:55:22 am »


... Colin... don't despair mate, I'm with you! I've got all this to come when Big Dave gives me the nod about the WTC he has ready for me - that will be when the 'fun' really starts... I'll need you (and hopefully a few helpful others on here) to tell me what to do then!  ;D
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colin-stevens

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Re: seehund
« Reply #43 on: August 10, 2006, 08:12:14 pm »

scratch built all mine, hence the crying. NEVER again. ready made in future, let us know how you get on
all the best
in sympathy
colin
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colin-stevens

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Re: seehund
« Reply #44 on: August 18, 2006, 08:26:41 pm »

cross youre fingers, toes and legs for me.big water this weekend, weather permitting. ready to go. gulp.
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colin-stevens

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Re: seehund
« Reply #45 on: August 29, 2006, 08:03:57 pm »

Oh woe is me. tried the damned thing out last weekend. didnt get much of a bash 'cos rain stopped play. but it was kind of succesfull, but a failure as well. found she leaked. in the bath she is fine. until i power up the motor, then she drags in a bit of water, despite a water tight shaft. decided it could be that i am creating such a vacuum in the boxes, to filll the bag, its pullng in ther wet stuff. so decided to add more volume. aded a tube housed in the conning tower and down as far as i can into the hull, also another tube sat behind this in the hull. straight away this is counter productive. more boyancy,more lead to get her down, the bigger the bag has to inflate. everything i do has a unwanted action. tried her out again tonight, in the bath. still bloody leaks. just off to have a cry.
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DavieTait

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Re: seehund
« Reply #46 on: August 29, 2006, 08:53:36 pm »

I've seen a few people advocating inflating the bag when the WTC isn't sealed so when you pump it back into the WTC you put positive pressure in there , makes it easier to re-inflate the bag and should help keep water out ( at least you'll see bubbles and can check where the leak is ).

Try reading thru the www.subpirates.com website , a lot of good info there

Davie
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colin-stevens

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Re: seehund
« Reply #47 on: August 29, 2006, 10:48:01 pm »

did think of that. trouble is i rely on vacuum in the boxes to drag the air out the bag. pump only works one way.
ta.
mor5e sympathy needed
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DavieTait

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Re: seehund
« Reply #48 on: August 29, 2006, 11:32:41 pm »

Might be an idea to get a reversible pump then Colin , more expense I know but it seems to be the most commonally used system I can find.

Davie
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Mankster

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Re: seehund
« Reply #49 on: August 30, 2006, 12:36:42 am »

Collin, what type of seal do you have on the prop shaft?
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