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Author Topic: The infamous Motorflote push tug...  (Read 180996 times)

hmsantrim

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Re: The infamous Motorflote push tug...
« Reply #75 on: February 21, 2015, 03:41:55 PM »

Hi Martin.
 that buff coloured "Box Boat" looks like something I have sailed  back in the day.  {-)
 
frank
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U-33

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Re: The infamous Motorflote push tug...
« Reply #76 on: February 21, 2015, 03:43:01 PM »

Martin...for once I am totally speechless.  {-)


Rich
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

hmsantrim

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Re: The infamous Motorflote push tug...
« Reply #77 on: February 21, 2015, 03:48:29 PM »

Nobody built a Motorflote?  <:(  C'mon guys...don't be shy, there must be a few of you out there in the depths of Mayhemland that built one,  surely?


Rich
Hi Rich.
     there were`nt digicams in 85 when that plan came out maybe they can`nt put any pix up or you have a one off.  I did google it but there is very little there.
 
 frank 
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U-33

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Re: The infamous Motorflote push tug...
« Reply #78 on: February 21, 2015, 03:52:51 PM »

I know Frank, I've Googled and Binged and Asked Jeeves and all sorts, I found a couple of photos of the full size boat and that was it. I'm hoping that if anyone has any photos of any sort, if they'd scan them for me...I regularly scan photos dating back to the late sixties of my boats, and they seem to come out ok. Fingers crossed...


Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

ray123

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Re: The infamous Motorflote push tug...
« Reply #79 on: February 21, 2015, 05:26:07 PM »


"Here's one I built earlier!"   :P

 

im intrested in the canadian tug behind the box :-))  is it one of the sea imps?
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Martin [Admin]

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Re: The infamous Motorflote push tug...
« Reply #80 on: February 21, 2015, 07:03:26 PM »


                    O0
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ray123

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Re: The infamous Motorflote push tug...
« Reply #81 on: February 21, 2015, 09:12:31 PM »

thanks martin  :-))
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U-33

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Re: The infamous Motorflote push tug...
« Reply #82 on: February 22, 2015, 09:18:47 AM »

Right, I know how a steering nozzle works, but on the Motorflote nozzle there is a small plate which runs the depth of the nozzle tube. I take it that it helps the nozzle work more effectively? It's obviously there for a reason, but what is the reason?


Also, I note that the plan suggests a 50mm diameter nozzle with a Monoperm motor...I haven't got one of those, so I'm thinking of using a 385 motor with a 35mm three blade brass prop in a 40mm diameter nozzle. Would that be a suitable replacement?


Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Netleyned

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Re: The infamous Motorflote push tug...
« Reply #83 on: February 22, 2015, 10:32:10 AM »

Just a little rudder Rich. It gives a little more direction to the thrust from the nozzle.
Try and get a kort prop to fit your tube closely
Kort props are shaped for efficiency and work much better than round ended blade props.


Ned
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U-33

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Re: The infamous Motorflote push tug...
« Reply #84 on: February 22, 2015, 10:42:56 AM »

You can tell I know naff all about nozzles and such things, Ned...


How about if I bought one of these: http://www.mobilemarinemodels.com/steerable-554-p.asp and added a small rudder from styrene sheet, would that do the trick? I can get a prop from somewhere...are they the ones with the flattened off tips to the blades?


Rich
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K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Brian60

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Re: The infamous Motorflote push tug...
« Reply #85 on: February 22, 2015, 11:20:35 AM »

As Ned says, its just a rudder attached to the kort nozzle. somebody obviously did their homework and decided that a greater steering ability could be had by combining them instead of just having moveable korts. This configuration is on the plans of a tug I have on file, so is not uncommon.

norry

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Re: The infamous Motorflote push tug...
« Reply #86 on: February 22, 2015, 11:24:06 AM »

The Blade down the back of a Kort nozzle improve the performance of the nozzle, Especially when going astern...
 
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hmsantrim

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Re: The infamous Motorflote push tug...
« Reply #87 on: February 22, 2015, 11:43:41 AM »

hi Rich.
 google   http://www.rc-toy.de/1432+-+Robbe+Kortduese.htm    its what they have on the seaport tugs  now if you can blag one off somebody well...life easier   {-) {-)
 frank
 
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barriew

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Re: The infamous Motorflote push tug...
« Reply #88 on: February 22, 2015, 11:47:07 AM »

How about if I bought one of these: http://www.mobilemarinemodels.com/steerable-554-p.asp and added a small rudder from styrene sheet, would that do the trick? I can get a prop from somewhere...are they the ones with the flattened off tips to the blades?
Rich


Yes - that would be Ok if you can't find one with the blade. I have some of these, but not sure if they are 40 or 50 mm. You can have one cheap if its the correct size. I'll check later and let you know what the size is.
It is important to get the correct prop though. Try Propshop for Kort props.


Barrie
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Subculture

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Re: The infamous Motorflote push tug...
« Reply #89 on: February 22, 2015, 12:10:08 PM »

Kort's work perfectly well with normal round edged props. The square blade profiles look nicer and probably will add a bit of efficiency but I doubt it adds a huge amount in model form, besides which quite common to see full size vessels with korts and round bladed props.

I built a bustler tug when I was a kid. I really liked the garnock tug, but couldn't afford the kit on pocket money, so I got the Vic Smeed plan and scratchbuilt the hull from plywood frames and pine strips, and made a steerable kort nozzle like the Garnock. I just used a bit of brass tube, with a normal three blade prop inside.

I used to win all the steering regattas with that.

BarryM

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Re: The infamous Motorflote push tug...
« Reply #90 on: February 22, 2015, 01:04:49 PM »

"quite common to see full size vessels with korts and round bladed props." Given the efficiency gains to be made with props having blade tips matching the radius of the nozzle, I am curious to know where you have seen conventional round-tipped props fitted to a nozzle?
Regards,
Barry M
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U-33

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Re: The infamous Motorflote push tug...
« Reply #91 on: February 22, 2015, 01:14:19 PM »

Thanks ever so much for all the advice, gents...as usual, much appreciated. I've just had a go at knocking one up, and surprisingly my fingers were cooperating...it looks reasonable to me.


Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Subculture

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Re: The infamous Motorflote push tug...
« Reply #92 on: February 22, 2015, 01:34:21 PM »

Subculture

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Re: The infamous Motorflote push tug...
« Reply #93 on: February 22, 2015, 01:35:40 PM »

Nozzle looks fine.

tugmad

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Re: The infamous Motorflote push tug...
« Reply #94 on: February 22, 2015, 02:16:47 PM »

Hi BarryM   it is very common to have rounded tip props with Nozzles for instance the Avenger,Hibernia, Ionia, Sun XXV and Sun XXVI all had nozzles fitted with their original rounded tip type propellors retained.   Geo
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U-33

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Re: The infamous Motorflote push tug...
« Reply #95 on: February 22, 2015, 02:19:35 PM »

And the finished article....


Rich



(just noticed I have a small bit of filing to finish off...)
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Rich

K-157 Vepr. Akula-II (project 971U)
---------------------------------------------------------------

~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Netleyned

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Re: The infamous Motorflote push tug...
« Reply #96 on: February 22, 2015, 02:35:37 PM »

A few of the Brixham Beamers have rounded props in Kort nozzles.
The Dickie tug has a Kort with rudder blade and round blade props.
To be honest I can't tell the difference in performance between my
Springer with a dedicated Kort prop and my dickie tug with rounded
blades.
Your effort looks just great Rich  :-)) :-))

Ned
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U-33

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Re: The infamous Motorflote push tug...
« Reply #97 on: February 22, 2015, 02:37:28 PM »

Well, thank you Ned...praise from the master.  %)


Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

radiojoe

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Re: The infamous Motorflote push tug...
« Reply #98 on: February 22, 2015, 02:45:24 PM »

Yep that looks fine to me Rich, I have an idea in mind to build a Springer and think I'll use something similar. :-))

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U-33

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Re: The infamous Motorflote push tug...
« Reply #99 on: February 22, 2015, 03:30:29 PM »

My springer has a nozzle fitted, but without the add on rudder blade...it damn near turns 360* in the bath, so the Motorflote should practically turn itself inside out.


Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html
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