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Author Topic: whats the BIGGEST steering nozzle for the AMSTERDAM ?  (Read 8026 times)

Cyberdan

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #25 on: March 22, 2013, 11:45:59 PM »

Hany,
Do you believe that a 70mm steerable kort is the largest size kort that can fit the Amsterdam model? I am going to play it safe for now and get a standard prop for the kort. It's not a major issue to try a flat tipped prop later, if I want to.
Glyn

Glyn,
 
70mm would about the right prop scale-wise, Weather the Kort nozzle will fit is a different issue, since some of the commecial ones might just be too thick walled and include a large stem which will require quite a bit of sanding down to just squeeze it in, remember that they made the model with a reular rudder and we're trying a retrofit here. I chose to use a plastic tube (not installed yet) but it should fit OK albiet looking kind of wonky snce it's too straight and does not have the taper a Kort should have, I was also thinking of finding a thicker plastic cup and cut it to size since it is tapered. Your thoughts everyone?
 
Hany
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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #26 on: March 23, 2013, 12:15:44 AM »

Hany,
I'm going to try a 70mm kort as some Amsterdam builds appear to have fitted one. I did consider the plastic tube but I don't have the tools to taper the thick wall or complete the sweeping internal curve. I'm sure that these features add considerably to its effectiveness and a purchased one is 'relatively' good value.
This is my first model and I'm not going to be too adventurous but I would like to do a good job. I already have ideas for future projects.
Glyn
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Cyberdan

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #27 on: March 23, 2013, 01:45:53 AM »

I'd be interested to know how it turns up. So please let us know which one you chose and how it fits.
Hany
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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #28 on: March 23, 2013, 01:59:33 AM »

Hany,
Will do.
Glyn
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #29 on: March 23, 2013, 02:19:59 AM »

can  some one post a pic of the underwater stern section ?
i don't have my kit yet
would like to ponder over what i can do to fit the KORT or the schottel drive from scratch , i have a few ideas about reshaping / flattening the underwater section at the stern


just a bit of  info for you guys
i have seen a few steering nozzle taken off real trawlers ( small ones 50" or so ) as they loose a lot of bollard pull  on a turn so when you are towing gear on the sea bed  and the boat loses momentum the gear can bog in to the bottom if its soft


but for maneuverability they are great for backing up in to a pen or a wharf 
NOT so good for towing with rudder on any thing but straight ahead
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slug

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #30 on: March 23, 2013, 05:44:33 AM »

robbe do large steering nozzles,plus matching props,they seem less bulky than others slug
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #31 on: March 23, 2013, 07:26:56 AM »

im reading that the robbe ones have a high breakage rate ??
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andywright

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #32 on: March 23, 2013, 09:04:51 AM »

Oh yes, can anyone tell me if the prop for a steerable kort nozzle needs to be a special prop - flat tipped blades, or will a standard prop be fine?


Glyn
you can get a nice 60 or 70mm kort from Mobile Marine models, and a matching prop from Prop Shop, which has flatish!! tips to the blades.They re a brilliant combination.
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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #33 on: March 23, 2013, 02:36:23 PM »

Andy,
I've been looking at steerable kort nozzles and found these;
Model Boat Bits - Cast polyurethane resin
Mobile Marine Models - 'Hardycast'
Prop Shop - Aluminium
The ModelBoatBits kort looks solid but possibly a bit chunky. The MobileMarineModels has a little more detail and the Prop Shop kort is no doubt very durable but the ordering codes make it difficult to size along with the associated prop. I expect I will go with the MobileMarineModel kort as you suggest unless anyone has any comments regarding the others?
I also attach a section through a kort which shows the profile which is why I chose not to start with a thick walled straight pipe section. Incidentally, on the Prop Shop website, it states that the venturi profile improves performance by 20%.
Regards
Glyn

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slug

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #34 on: March 23, 2013, 10:41:59 PM »

as regards prop size for mobile marine kort if you tell prop shop what size kort you are using ,they will tell you what size prop needed  tony
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oldiron

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #35 on: March 24, 2013, 12:49:33 AM »

can  some one post a pic of the underwater stern section ?
i don't have my kit yet
would like to ponder over what i can do to fit the KORT or the schottel drive from scratch , i have a few ideas about reshaping / flattening the underwater section at the stern
j

Hopefully this picture of my model stern section will be of help. You'll notice the extension I put onto the rudder to make it more effective.

John
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bigford

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #36 on: March 24, 2013, 12:51:54 PM »

heres mine off a happy hunter 60-65mm
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #37 on: April 26, 2013, 03:56:40 AM »

OK GUYS
here is the prop shop kort [size=78%]i got for my amsterdam 85 mm out side dia fits just fits [/size]without[size=78%] mods the hull ,and still retains a shoe under the nozzle for the pintail [/size]
[size=78%]polishes up nice lol [/size]
[size=78%]75 mm 4B KORT PROP shop /prop  is on the way [/size]











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derekwarner

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #38 on: April 26, 2013, 05:55:15 AM »

That looks like a very clean Kort Nozzle old shrimper......did you just take it out of the dishwasher?  {-) ....sorry....couldn't resist.....Derek  :o
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #39 on: April 26, 2013, 06:01:20 AM »

well almost
a bit of autosol and a rub  LOL 
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #40 on: April 28, 2013, 09:26:47 AM »

well so far i've had to rise the shaft line 4mm to get the apture clearance wright and retain the  inner keel bed for the shaft tube otherwise the nozzle would hung down lower than the main underside of the keel , i wanted to keep the shaft ine for and aft the same as was intended
now i have 1.5 m clearance from the front of  nozzle to the underside of the hull and 1.5 m from the nozzle to the shoe on the keel to karrey the pintail for the nozzle

and push the shaft log back 45mm or else the shaft would be to short, needed  45mm of shaft /tube  back past the stern post to reach the disc in the nozzle ,
im still waiting for the prop so not game to finishing gluing  everything up till i've tried the prop to see if the nozzle turns ok
there really wouldn't be too much work to fit a z drive just a flat platform inside and and fair it in underneath
cheers Bob

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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #41 on: May 06, 2013, 03:21:18 AM »

a link to some pic of an amsterdam WITH A  Z DRIVE


http://www.rcgroups.com/forums/attachment.php?attachmentid=2129332




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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #42 on: May 08, 2013, 11:43:45 PM »

Old Shrimper,
Did you get a copy of the John Fryant Amsterdam build that 'Oldiron' was offering on the Forum? After reading it, I've decided to build my Amsterdam with a bit more authenticity, rather than as the kit describes. Initially I thought it would be beyond my skill for a first build, but now I think the effort to make the changes will be worth it. Most noticeably, recessing the anchors, rather than have them stuck out on either side.
I'm also looking for better photos of the boat davits as I think I could probably make a better set.
I know it's a stand off model but it's a good looking vessel that I believe can be greatly improved with a bit more detail. Well I'm going to give it a go anyway and I should learn a thing or two along the way.
Keep the pictures and progress reports coming. I look out for them.
Glyn
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #43 on: May 09, 2013, 08:02:24 AM »

no i dident get a copy of that ?


yes i am going to recess the anchors all so
  i think they look silly sticking out to
i have some pic some were
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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #44 on: May 09, 2013, 02:23:17 PM »

Old Shrimper,
I've just emailed you a copy of the John Fryant Amsterdam build. It was sent to me by 'Oldiron', so John and he should get the thanks.
John highlighted some of the inconsistencies in the kit with the real vessel. The anchors I've already mentioned. The layout of windows and doors into the accommodation port and stbd side. The area between the funnels and the aft section behind the lifeboat davits. He also mentioned the aft winch being incorrect but I can't locate a good original photo of that. I think I'll add some 'Restricted in Ability to Manoeuver lights' (red-white-red) which are not in the kit.
I'm going to make some of the changes he mentions but I'm not a rivet counter so I won't be going to extremes.
Glyn
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #45 on: May 18, 2013, 08:13:37 AM »

ok here is some pic of the nozzel fitted





prop shop nozzle / prop





fits nice but any bigger and it would start to be a pain













still molding IN THE STERN POST  GOING TO BRING THE BOG ALONG THE SHAFT TUBE TO REINFORCE IT





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Captbearuk

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #46 on: May 18, 2013, 04:38:09 PM »

Old Shrimper,
What motor; gearbox reduction, are you having with this kort?
Glyn
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old shrimper

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Re: whats the BIGGEST steering nozzle for the AMSTERDAM ?
« Reply #47 on: May 18, 2013, 09:48:03 PM »

hi glyn


it will be hi torque 770 low rpm  with no gearbox
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