Model Boat Mayhem - Forum

Please login or register.

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

Author Topic: Imara drive train  (Read 1764 times)

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Imara drive train
« on: June 05, 2018, 10:38:07 AM »

haveing been away from model boating for over 20 years now
I decided time to get back into model boating my heils  are getting to fast now  so I managed to get hold of an early caldercraft imara twin screw kit that had been in a loft for a number of years
The kit is untouched  :-))
 Am I need of some information on the range of motors that are now suitable to fit the model as I can not find any decapems to fit
Some help please
Barry
Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #1 on: June 05, 2018, 12:23:56 PM »


12v system, car blower motors, strong couplings.    :-))

See:  http://www.modelboatmayhem.co.uk/forum/index.php/topic,54588.msg642268.html#msg642268
Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: Imara drive train
« Reply #2 on: June 05, 2018, 01:53:34 PM »

Any pictures of blower motors fittted ?
Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #3 on: June 05, 2018, 03:18:17 PM »


Go back to homepage:  http://www.modelboatmayhem.co.uk/forum/index.php
Do a search for Imara  :-))
Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

Brian60

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 3,315
  • Location: Hull,UK-but currently residing in Los Martinez, Spain.
Re: Imara drive train
« Reply #4 on: June 05, 2018, 04:03:12 PM »

The world is your lobster nowadays :}  For torque purposes brushless outrunners require a complete rethink on motor drives, but basically you'll get more torque from them than you get from a blower motor and in a package that is a quarter of the size!


blower motors or even standard dc motors aka 500 series etc = lead acid batteries (old school)


brushless motors = LiPo batteries (new school)


but there can be lots of mixing and matching among them, as I said the world is your lobster, check google or even the local club and get plenty of advice before plumping for your system. The caveat being, if you are knowledgable about standard dc motors, stick with them.

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
What brushless motors
« Reply #5 on: June 05, 2018, 05:30:12 PM »

new imara tug twin shafts Looking for information on motors for it
Logged

Tug Fanatic

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,273
  • Location: England
Re: Imara drive train
« Reply #6 on: June 05, 2018, 06:49:09 PM »


Blower motors & lead acid batteries are old technology which works & works well. Totally reliable over many years & very good low speed control. Drive pretty well any prop that you want to connect to them. Not really suitable for fast models but brilliant for big tugs. Not as easy to source as they used to be.


Size & weight don't really matter in an Imara.
Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #7 on: June 05, 2018, 06:55:15 PM »

Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

canabus

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 713
  • Boats a hole in the water you pour money into!!!
  • Location: Tasmania,Australia
Re: What brushless motors
« Reply #8 on: June 06, 2018, 07:09:48 AM »

Hi 1275mini
What size props and number of blade are you planning to use ?
Reduction Gears ?

Raboesch have a chart on prop types and the maximum RPM they can handle.


Canabus
Logged

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Logged

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: What brushless motors
« Reply #10 on: June 06, 2018, 10:41:32 AM »


I was thinks about
MFA 850torpedo motor direct drive on 6 volt 75mm 3 bladed props
do motors  have to be L/H and R/H turning
Logged

Liverbudgie

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,144
  • Model Boat Mayhem is the Best!
Re: What brushless motors
« Reply #11 on: June 06, 2018, 11:42:40 AM »

I was thinks about
MFA 850torpedo motor direct drive on 6 volt 75mm 3 bladed props
do motors  have to be L/H and R/H turning

Motors run one way, to have one running in the opposite direction to the just reverse the polarity. I would also advise using twin speed controllers, 2 inch/50mm four blades props will more than suffice.

LB
Logged

derekwarner

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 7,892
  • Location: Wollongong Australia
Re: Imara drive train
« Reply #12 on: June 06, 2018, 12:19:36 PM »

1275 sounds like a Cooper S, and yes in OZ these were used by the  :police: as pursuit vehicles........[I had a standard 850 Minivan from new in 1968?........]

Now all of these power specification things are important as I believe my mini was in fact 848CC, not 850 as advertised

So with all of this power under your throttle in your Cooper S.......was great  %).... [was it in the BRG colour?]

But to answer your question...."Would two of these work in the tug"

NO  <*<......a totally inappropriate selection for the application

Derek
Logged
Derek Warner

Honorary Secretary [Retired]
Illawarra Live Steamers Co-op
Australia
www.ils.org.au

deepstar

  • deepstar
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 61
  • Location: southport
Re: Imara drive train
« Reply #13 on: June 06, 2018, 05:01:59 PM »

hi
all the imaras i have seen
 were powered by two bugler motors
very reliable
 very powerful
and very low drain on your  lead acid battery
 
 that also helped with ballast you will need
good luck with your build
deepstar
Logged

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: Imara drive train
« Reply #14 on: June 06, 2018, 05:10:27 PM »

Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #15 on: June 06, 2018, 06:04:22 PM »


And two of these
https://www.ebay.co.uk/itm/775-DC-12V-36V-3500-9000RPM-Large-Torque-Low-Noise-High-Speed-Motor-Gear-Bearing/282512088976?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649


Those look interesting as tug motors ... but they are from China so heavens knows what will actually turn up!
Let us know 1275mini.

(Posting info for future reference)


775 DC 12V-36V 3500-9000RPM Large Torque Low Noise High Speed Motor Gear Bearing
Ebay item number: 282512088976

Package Include:
1 x Motor Bearing

Features:
-100% brand new and high quality.
-Used Used for electronic game machine, electronic toys, car toys, robot, electronic equipments, etc.
-High torque and low noise.
-Great replacement for the rusty or damaged DC gear motor on the machine.

Specification:
Color:Silver
Weight:382g
Voltage:12V~36V
Rated Speed:3500~9000RPM
Shaft Diameter: Approx. 5 mm
Shaft length: Approx. 17 mm
Body length: Approx. 66.7 mm
Front steps diameter: Approx. 17.4 mm
Former high level: Approx. 4.7 mm
Body diameter: Approx. 42 mm
Motor Overall Length: Approx. 98 mm
Diagonal installation pitch: Approx. 28.8 mm
Mounting hole size: M4
Mounting hole: 2
Cooling fan: Yes
Current Rating: 0.16 A

Alternative listing:
Model: 775
Shaft Diameter: 5 mm
Shaft length: 17 mm
Body length: 66.7 mm
Front steps diameter: 17.4 mm
Former high level: 4.7 mm
Body diameter: 42 mm
Motor Overall Length: 98 mm
Diagonal installation pitch: 28.8 mm
Mounting hole size: M4
Mounting hole: 2
Cooling fan: Yes
Rated voltage: 24 V
Current Rating: 0.16 A
Rated Speed: 7000 RPM
Different voltage parameters:
DC 12V, current 0.14A, speed 3500RPM
DC 18V, current 0.15A, speed 4500RPM
DC 24V, current 0.16A, speed 7000RPM
DC 30V, current 0.17A, speed 8100RPM
DC 36V, current 0.20A, speed 9000RPM
Material:Metal
Colour:Silver
Package Included: 1 x 775 Motor



Item specifics
Condition:  A brand-new, unused, unopened and undamaged item in original retail packaging
Brand:    Unbranded/Generic
Rated Speed:    3500~9000RPM    
MPN:    ZUM656615
Mounting hole size:    M4    
Voltage:    12V~36V
Current Rating:    0.16 A










Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #16 on: June 06, 2018, 06:21:43 PM »


Also, what about these motors?


https://www.ebay.co.uk/itm/12V-4500-RPM-Combustion-Air-Blower-Motor-For-Eberspacher-Heater-D4-Replacement/253672263339?hash=item3b100b8eab:g:~MkAAOSwcfdbF37Z




Condition:    
New: A brand-new, unused, unopened and undamaged item in original retail packaging

Color:    Black & Silver
fit 1:    for Eberspacher Heater D4 Replacement    
Material:    Metal & Plastic
Approx.12.6x4.2cm(4.96x1.65inch)(HxD)
Brand:    Unbranded/Generic    Voltage:    12V
MPN:    Q0EWNTEYMA    
Speed:    No-load: 4500 RPM
Country of Manufacture:    China    


Combustion Air Motor 12 Volt 4500 RPM Fit For Eberspacher Heater D4 Replacement
Specifications

    Condition: 100% new
    Color:Black & Silver
    Material: Metal & Plastic
    Size: approx.12.6x4.2cm(4.96x1.65inch)(HxD)
    Voltage: 12V
    No-load Speed: 4500 RPM
    Number of Port: 2
    Item included: 1 x Combustion Air Motor
    Compatible With: Fit for Eberspacher Heater D4 Replacement

    This Is Aftermarket Replacement Item But Not Genuine
Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: Imara drive train
« Reply #17 on: June 06, 2018, 06:37:50 PM »

Just ordered two so now I will have a few different routes to go down
The 775 motors are located in the uk the ad states
We will have to wait and see  :-))
Logged

tugboyben

  • Kirkleesmodelboatclub
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 718
  • WARRIOR TUG BOAT
  • Location: LIVERSEDGE
Re: Imara drive train
« Reply #18 on: June 06, 2018, 07:18:00 PM »

I used the 775 motors a few time's had no problems with them


Component-shop hear in the UK stock them


https://www.componentshop.co.uk/775-dc-motor-5000rpm-with-mounting-bracket.html


Look forward to seeing your progress


Jason




Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 18,589
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: Imara drive train
« Reply #19 on: June 06, 2018, 07:21:00 PM »


   .... and Component-shop  much more reliable than ebay!
   :-))
Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: Imara drive train
« Reply #20 on: June 06, 2018, 07:38:55 PM »

Not to far from me but look at price difference
Still they are ordered now
Logged

1275mini

  • Shipmate
  • *
  • Offline Offline
  • Posts: 13
  • Model Boat Mayhem is Great!
  • Location: Wirral
Re: Imara drive train
« Reply #21 on: June 16, 2018, 05:26:57 PM »


Would not the rpm be to high ?
Got them now but not sure about fitting them also have two mfa 800s on gearboxs turning at 2300
Not sure what size props to order now
Quote from: Martin [Admin
link=topic=60900.msg642557#msg642557 date=

Also, what about these motors?


https://www.ebay.co.uk/itm/12V-4500-RPM-Combustion-Air-Blower-Motor-For-Eberspacher-Heater-D4-Replacement/253672263339?hash=item3b100b8eab:g:~MkAAOSwcfdbF37Z




Condition:   
New: A brand-new, unused, unopened and undamaged item in original retail packaging

Color:    Black & Silver
fit 1:    for Eberspacher Heater D4 Replacement   
Material:    Metal & Plastic
Approx.12.6x4.2cm(4.96x1.65inch)(HxD)
Brand:    Unbranded/Generic    Voltage:    12V
MPN:    Q0EWNTEYMA   
Speed:    No-load: 4500 RPM
Country of Manufacture:    China   


Combustion Air Motor 12 Volt 4500 RPM Fit For Eberspacher Heater D4 Replacement
Specifications

    Condition: 100% new
    Color:Black & Silver
    Material: Metal & Plastic
    Size: approx.12.6x4.2cm(4.96x1.65inch)(HxD)
    Voltage: 12V
    No-load Speed: 4500 RPM
    Number of Port: 2
    Item included: 1 x Combustion Air Motor
    Compatible With: Fit for Eberspacher Heater D4 Replacement

    This Is Aftermarket Replacement Item But Not Genuine
Logged

Shipmate60

  • Global Moderator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 5,218
  • You bark - I will bite!!!
  • Location: Fareham
Re: Imara drive train
« Reply #22 on: June 16, 2018, 11:11:12 PM »

A lot of Imara's use Deccaperms, these give decent performance but the gear whine makes them sound gas turbine powered. The Deccapers run about 4750 rpm so that is a good guide using 4 blade brass props.


Bob
Logged
PFC, down but not out

Subculture

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 3,813
  • Location: North London
    • Dive-in to Model submarines
Re: Imara drive train
« Reply #23 on: June 17, 2018, 01:36:49 PM »

If you're going to use reduction, then a couple of 545's on 12 volts at about 3 or 4:1 would provide ample motive force. I favour belt drives over gears- silent and largely maintenance free.

If I want an idea of how fast a boat will go at a specific RPM with a prop I know the pitch of, I assume the prop will be at best 60% efficient (model props rarely exceed this I find) and use the following formula.

Prop pitch (in mm) x RPM x 0.00002= speed in mph

Clearly there are many other factors influencing speed, props blade area, style of hull etc. But it gives you a baseline to work from.
Pages: [1]   Go Up