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Author Topic: crane barge / rescue boat /weed cutter  (Read 5031 times)

malcolm.howard2

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crane barge / rescue boat /weed cutter
« on: March 04, 2012, 04:57:39 pm »

Crane Barge / Weed  Cutter / Boot Retrieval   system.    Hull is made from 10millimeter thick  marine plywood  with the bow section  sealed  by a solid bulkhead, there is a second bulkhead  in the centre of hull, dividing hull into three watertight sections. The box on stern  (or container)  has two uses, When  empty  it  =  Bouyancy . When crane is lifting heavy loads  water is  pumped  in to counterbalance load. The weed cutter is a  modified  hedge trimmer, Fitted  to  a long drive shaft  with motor fitted at top end of  it, This allows it to be raised and lowered at will, depending on depth of water, It clamps to side  of hull, And  when not in use, it swivels under hull and comes up behind stern. It can also be removed easily,    The boat retrieval  system is operated  by the crane,  which lowers  a large weighted  net into water,  Then  you steer  barge up to casualty and lift up net with boat inside. The crane can lift 35lbs with jib flat level with deck, When jib is upright it is considerably more.     

Specs.

Crane jib height = 60inch when folded down 30inch
Load capacity = Straight ought level with deck =35lbs
                           Upright                                        = Unknown at least 80lbs+
                           Depends on number of pulleys used on lift cable
Battery power =12volt     620 Amps    =  part  of  ballast
Hull size         = Beam 30inch     
                       = Length   64inchs               
Depth of side panels  =     8inch
                       = Weight at 4inch draught 273lbs.   1 inch =68lbs
Motors            = Two direct drive to 75mm Korts  4 blade  props
                       = Two bow thrusters,  60mm Korts  6 blade  props 
                       = Three large crane winch  motors,  = converted  windscreen wiper       
                          motors                     
                       = A powerful   water pump to fill  balance water tank

Electrics         =I will not  comment  on this subject,  study  the photos? It might  look  complicated  but is very basic, All switch boards are easy to remove  for maintenance,   if required.  I find  Micro  Switches,  Relays, And my  oil cooled resistors very  reliable, They  might be old fashioned but  they donít  blow up at the smallest  problem,   








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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #1 on: March 04, 2012, 05:13:13 pm »

more photos









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rathikrishna

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Re: crane barge / rescue boat /weed cutter
« Reply #2 on: March 04, 2012, 05:17:24 pm »

Wow..awesome machine... :-))
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Tombsy

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Re: crane barge / rescue boat /weed cutter
« Reply #3 on: March 04, 2012, 05:34:16 pm »

Wow, fantastic you could hire out your services with that rig. :-))
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Martin [Admin]

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Re: crane barge / rescue boat /weed cutter
« Reply #4 on: March 04, 2012, 06:48:23 pm »

Now  that's a real man model boat!

 Next time you use the Weed cutter, take a video clip for us!  :-))
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #5 on: March 04, 2012, 08:27:11 pm »

MARTIN.  Thankfully at this time of year we dont get  any weed  growing in our lakes its to cold. When  in use  not much to see , only shaft and motor hanging on side of hull. It was a hedge trimmer  in a past life, using just the cutter bar and gearbox,  modified to fit onto a long drive shaft which clampes to a swiveling bracket  fitted to side of hull

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More Coffee

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Re: crane barge / rescue boat /weed cutter
« Reply #6 on: March 05, 2012, 07:28:27 am »

Thats really Nice!!
smart use of the electrics,that "old" stuff is cheap and reliable..

I have to ask though..What is the superstructure made of,and how is it anchored to the hull?

35lbs on that bridle is wanting to pull that wheel house off,roughly 175ft/lbs of torque on that sucker.
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rathikrishna

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Re: crane barge / rescue boat /weed cutter
« Reply #7 on: March 05, 2012, 07:30:19 am »

great inspiration.. :-))
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #8 on: March 05, 2012, 08:51:48 am »

More Coffee   Top is  made from same sheet of ply as hull  10mm thick marine grade.  It is held  on by angel brackets, front is screwed to deck,  rear is bolted to  take force loadings  of lifting load. After removing  2 nuts under rear deck + 2 screws  at front and 4 screws  that hold the pulley  block assembly on top of structure, it can be removed leaving crane still rigged, the fixing brackets are concealed by boxes
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #9 on: March 05, 2012, 09:19:19 am »

In the photos, one shows  my buoyancy system,  that is the green plastic drums, two are taped together these are trapped under super structure above deck level  if it sinks hull should  stay up write there are more drums in bow section 
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offshore1987

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Re: crane barge / rescue boat /weed cutter
« Reply #10 on: March 05, 2012, 09:02:58 pm »

Stunning model, love the size of her  :-)) Its such a good idear duno why other people havnt done it before ( this size )
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geids

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Re: crane barge / rescue boat /weed cutter
« Reply #11 on: March 05, 2012, 09:28:13 pm »

All I can say is, if you happen to be passing Strathaven Pond in the summer. Make sure you bring this monster with you, as we could make make good use of the weedcutter.


John
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #12 on: March 06, 2012, 08:49:57 am »

GEIDS   coming up to Motherwell  from Norfolk towing  trailer  and crane  is a long day out, but we do get lost sometimes.
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #13 on: March 28, 2012, 04:17:38 pm »

This is how  I move and transport  my crane barge with very little effort to me.









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offshore1987

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Re: crane barge / rescue boat /weed cutter
« Reply #14 on: March 28, 2012, 05:57:53 pm »

Again thats a really good idear  :-)) Its given me an idear for my 1/12 tid tug when shes done, was wondering what would be the best way to move n launch her  :-)
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More Coffee

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Re: crane barge / rescue boat /weed cutter
« Reply #15 on: March 28, 2012, 07:00:18 pm »

Ya built a jib crane to move it,now thats an Idea.. I'll have to look at..

Im planning an 8ft ferry and was thinking of uising a system that ambulances and funeral homes use to load off load on a gurney.
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #16 on: March 30, 2012, 10:14:09 am »

   Hi to Offshore 1987 and More Coffee,  thanks  for interest  in trailer launch system,  i use it with my larger models,   The trailer is also used to carry  my  MOOR--- -  -  K  tug which is 1inch = ifoot the Trailer has a longer tow bar fitted which goes all the way, to  back  of trailer,  the rear tailgate is lowered  and fixed level with floor. Tug boat is much larger in size but  wheighs  about the same without its water ballast in. Trailer allso has a slide out  box section bar that fitts inside tow bar this allows tug to be launched like life boats down slipway, when this method is used the crane is removed to keep down wheight. The box section bar is not normaly carried.
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malcolm.howard2

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Re: crane barge / rescue boat /weed cutter
« Reply #17 on: March 30, 2012, 03:23:11 pm »

Hi more photos.  This is my trolley for  transporting  barge  to and from storage to trailer 







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