Model Boat Mayhem - Forum

Please login or register.

Login with username, password and session length.
Pages: 1 [2] 3 4   Go Down

Author Topic: new big tug build  (Read 19939 times)

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #25 on: September 10, 2013, 01:55:15 PM »

 Just update,  we have fitted the 900 motor and i new motor mount and had send for another coupling, the steering gear is in and working fine, I was thinking i will need a hatch so we can get at the steering, have also been working on the wheelhouse windows and i will start to make the insides of the wheel house i.e the wheel and other ancillaries.
Logged

big bill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 41
Re: new big tug build
« Reply #26 on: September 16, 2013, 01:29:49 AM »

gday ,
 i think you need a g/box for that sized tug and prop , 75 mm ??
even w the 900 motor , i think you need 3:1, but see how you go , were you told the 900 will turn the 75 prop ??
if so , try it , a 545 would almost drive it w 5:1 ratio , but you loose prop revs =less drive
i tend to use a g/box on most of my high load/tug drives , but thats just me
regards and good luck bill s
Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #27 on: September 16, 2013, 01:17:51 PM »

why do you think i need a 3:1 gearbox with the 900 motor or i.e. 5:1 gearbox??

and where can you get these type of gearbox to fit the 900 motor

I have to tell you i have never built a tug or used a 900 motor or a gearbox, as for the prop i had ordered the propeller before i started the project, i did get pm advising to use a 70mm 4 blade, but as i said i had already purchased 2 75mm propeller's as i i bought two tug hulls.
Logged

big bill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 41
Re: new big tug build
« Reply #28 on: September 16, 2013, 03:01:57 PM »

gday para h,
  i think you need a g/box , due to the drag+size of your hull+load caused by your prop , 75 mm ??
if you have being advised by some-one else who sold you the motor , or has used that motor to drive your prop , ignore me , because i should be wroung .
BUT my experience w motors out here in OZ, and i do experiment w a lot of different motors , tells me that there is a big increase in load w a large prop , motors dont like to be held back , and if they can`t  spin up to speed , they burn out . a heater fan motor is only happy w approx. a 50/60 mm prop , direct drive , but w 3:1 g/box , will drive 100mm+ prop .
 graupner 900 motor w approx. 2:1 gears , drives only a 65 mm prop in they ZED drive unit , thats w gears+65 mm prop , there are some motors out there ,that only rev slowly , and will turn big props direct , but not many
i think , just by looking at your motor , but without all the facts , motor specs , i would be fitting a t/belt home made g/box+3:1/4:1 ratio
we are very limited on oZ for motors , but im drawing up plans for a 1100mm+ tug , narrow beam ,w 90/100mm prop , and it will be driven by 700 jaycar motor via 4:1 g/box , and it should chew stumps all day !!another mob uses brushless motors , w 2.5:1 reduction , to 90 mm props , notice g/box !!
i hope i havent sound big headed,all confused you more , but thats my humble opinion, if you want more info , just ask -bill s
Logged

Netleyned

  • Full Mayhemer
  • *****
  • Online Online
  • Posts: 8,988
  • Location: Meridian Line, Mouth of the Humber
    • cleethorpes mba
Re: new big tug build
« Reply #29 on: September 16, 2013, 03:40:16 PM »

The 900 thar Para_Handy is using revs at 3000RPM at 12V.


The Graupner revs more than twice that.


Ned
Logged
Smooth seas never made skilful sailors
Up Spirits  Stand fast the Holy Ghost.
http://www.cleethorpesmba.co.uk/

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #30 on: September 16, 2013, 04:26:58 PM »

The 900 that I am using revs at 3000RPM at 12V.

Is there someone who has used this 900 motor at 3000rpm at 12v and could you please say what size of prop you used and if it was 3 blade or four and what was the outcome in the water.

i have used the 900 motor and 3 blade 75mm propeller.
Logged

big bill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 41
Re: new big tug build
« Reply #31 on: September 16, 2013, 11:58:19 PM »

gday para h,
 i see on another post that the 900 w 3000rpm will drive 70 mm props fine , no g/box , so you should be fine w 75mm prop .
this is 1 of those rare slow reving motors w heaps of torque , we cant get them out here easily .
 with what motors we can get out here in australia , we generally have to use a home made g/box , and tooth belts are nice and quiet , which allows the motors to rev , and build torque , but we balence the prop revs to achieve max. power from prop , too big a reduction , w small prop , just doesnt work
but its still a "suck it and see" method
545 w 5:1 g/box will drive a biggish prop ,75mm+
but w a heavy tug , its better w a700+motor and 3/4:1 reduction
i would like to know more about these 900 motors , what breed +who sells them ??i would like to try 2 in a tug
good luck w the build , its looking good .
 regards bill s
Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #32 on: September 17, 2013, 08:21:28 AM »

hi Big bill these motors have the following spec.
900 Torque Motor
 Ref: CEM900T
 900 High Torque motor from Caldercraft Electric Motors (CEM).

Nominal Voltage: 12V
Operating Range: 6-24V
RPM at Nominal Voltage: 3000
No Load Current: 0.4A
Current at Nominal Voltage: 5.0A
Stall Current: 20.3A
1/4in plain output shaft

that's all it says about them and the price is 22   5.23 vat= 27:53
Logged

big bill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 41
Re: new big tug build
« Reply #33 on: September 17, 2013, 10:34:15 AM »

gday para h,
 thanks for the info , i like the LOW current draw , of less than 1 A , thats unheard of in simple can motors -only other motor who comes close is the 555, on 50 mm direct drive prop (60 mm , if you smile !!) draws only about 1A, on load !! or a tad more , but it only revs to 5000 rpm approx. and has to be matched to the model , but i like it in older work boats , as i can cruise all day .
i will have to get some of those 900 motors and try them , i normally go for a revier motor , and run it through a g/box to brass prop , not much choice out here .the only other motor w similar specs is thew T motors of another UK supplier , similar low revs and low consumption of Amps .
those type of low current ,high torque motors are hard to find
i have 2 steam tugs to do in the next 2-5 yrs ,and i should try the 900 in those , 90/100mm prop , 4 bladed brass
good luck w the build , should be a nice tug , keep the photos coming
regards and thanks bill s
Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #34 on: October 24, 2013, 12:26:02 PM »

hi there i have not forgot to post more of the build, I have to get another camers as i damaged it in-fact it was in my  workshop and i knocked it of the bench
and the rest is history.

Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #35 on: October 24, 2013, 12:27:03 PM »

can someone advise me of a good source for paints for the tug
Logged

Tug-Kenny

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 7,680
  • Location: Newport. S Wales
Re: new big tug build
« Reply #36 on: October 24, 2013, 04:46:35 PM »


The general consensus seems to be Rattle cans from a car shop.



ps .....  I do like the red oxide as an undercoat.  It covers well and can be lightly sanded.

ken

Logged
Despite the high cost of living   .......... It remains popular

kmmbcwebmaster

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 131
  • Location: Sutton-in-Ashfield
    • Kingsmill MBC
Re: new big tug build
« Reply #37 on: October 24, 2013, 06:06:31 PM »

I have fitted these 900 motors in my MMM eurogirl have 40mm 4 blade props fitted on 12v got a bollard pull of 7lbs and happily runs all day .have tested these on 24v with same set up and got 10lbs of thrust on bollard pull .
On 24v set up have got around 3hrs tug towing before batterys start to loose power .
Logged
just tugging along

Skimmer Fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 293
  • Location: Wigan
Re: new big tug build
« Reply #38 on: October 24, 2013, 06:39:24 PM »

Hi
Have you decided on the scale for your deck fittings like winches
Logged
Regards
Skimmer Fan

tugnut

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 403
  • Location: herne bay kent
Re: new big tug build
« Reply #39 on: October 24, 2013, 07:40:07 PM »

Sounds like you are getting on,But where are the pictures ;) :-))
Logged

big bill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 41
Re: new big tug build
« Reply #40 on: October 25, 2013, 01:34:31 PM »

gday para , nothing wrong w rattle cans , but , make certain they are enamel paint , it is available in acrylics too , water based ,if you put enamel on acrylic ,it will crazy crack , and look awful
if you start the model paint w enamel , you have to finish w enamel , or vise versa w acrylics .
 whilst  humbrol is dear to paint a large model ,its real good paint ,i have a yacht ,25+ yrs old ,and the humbrol paint is still good ,and show condition , allowing for its age .
 if you use auto paint , thats OK ,as it works out cheaper , i spray all my models in primmer from a rattle can , paint what i can w rattle cans in base colours , then trim Finnish w humbrol in colours i cant get from spray cans .
 the more you do it , the better you get at it
bill
Logged

Stavros

  • Guest
Re: new big tug build
« Reply #41 on: October 25, 2013, 01:45:23 PM »

Read all about it in the article by myself in the painting section.
 
 
Dave
Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #42 on: October 26, 2013, 10:20:41 AM »

yes i am using 1/32 scale parts
Logged

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #43 on: October 27, 2013, 11:55:27 AM »

Does anybody know where i can buy a decal of a Engine Order Telegraph as i have had no luck on the net
Logged

dougal99

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,926
  • Huntingdon, Cambs, England
  • Location: Huntingdon, England
Re: new big tug build
« Reply #44 on: October 27, 2013, 12:29:13 PM »

Have you thought about making one. Vinyl sheet for printers is available here http://www.modellettering.com/showProducts.asp?categorycode=011
and possibly elsewhere.
Logged
Don't Assume Check

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #45 on: October 27, 2013, 01:09:19 PM »

i have decal paper I will have a Go and make my own

Logged

Skimmer Fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 293
  • Location: Wigan
Re: new big tug build
« Reply #46 on: October 28, 2013, 06:31:12 PM »

Isthis of any use
Logged
Regards
Skimmer Fan

Skimmer Fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 293
  • Location: Wigan
Re: new big tug build
« Reply #47 on: October 28, 2013, 08:53:24 PM »

para_handy
Taken at the weekend
Logged
Regards
Skimmer Fan

Skimmer Fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 293
  • Location: Wigan
Re: new big tug build
« Reply #48 on: October 28, 2013, 08:54:47 PM »

and these
Logged
Regards
Skimmer Fan

para_handy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 60
  • Location: Peterhead
Re: new big tug build
« Reply #49 on: October 29, 2013, 08:54:44 AM »

Hi there Skimmer these pics are a great help thanks for posting them
Logged
Pages: 1 [2] 3 4   Go Up