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Author Topic: Graupner Schottel Drive Unit II 2335 ?  (Read 1070 times)

mrzippy

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Graupner Schottel Drive Unit II 2335 ?
« on: January 06, 2018, 01:03:00 PM »

Gathering ideas for a new approx 28" tug project powered by a single Schottel drive,
and in an effort to save myself many hours engineering and experimenting anguish,
the large Graupner Schottel Drive with its 65mm prop could fit the bill.

My question is to anyone with experience or thoughts about build quality and reputation of the unit,
are they reliable, would I be buying into something requiring parts upgrades or new gears after little use etc ?

My preference would be to use the specified brushless motor in a hope to obtain reasonable pulling power/grunt,
any thoughts would be appreciated thank you.

regards Paul

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Tug-Kenny

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #1 on: January 07, 2018, 10:44:05 AM »


The rotating prop end tends to fall off in the briney. 

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Umi_Ryuzuki

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #2 on: January 07, 2018, 06:06:42 PM »

The rotating prop end tends to fall off in the briney.

The old Marx/graupner(1775) maybe, but not on the 2335 unit... it's one piece.

poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #3 on: January 07, 2018, 06:40:18 PM »

  Umi you must have a draw full of these old drives if not shottles it's the old gray  voiths. Lol
 
   John
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T33cno

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #4 on: January 07, 2018, 06:41:27 PM »

I have two 2335 for my next tug. They must be limited to 8000rpm I believe and have 3:1 gear reduction. I bought two large brushed motors from components shop that are just a little faster but can limit revs with my transmitter. I'm quite confident about their quality.


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poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #5 on: January 08, 2018, 01:28:08 PM »

Hi Paul. Will you be towing with the tug.


John
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Tug-Kenny

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #6 on: January 08, 2018, 02:40:33 PM »

The old Marx/graupner(1775) maybe, but not on the 2335 unit... it's one piece.


Hi Umi,

Yes indeed tis the ones.   A bit heart breaking when a complete new one has to purchased.

How do the new ones fit to the boat and not become as two pieces.

Cheers

ken


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Umi_Ryuzuki

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #7 on: January 08, 2018, 06:58:57 PM »

The old Marx/graupner(1775) maybe, but not on the 2335 unit... it's one piece.


Hi Umi,

Yes indeed tis the ones.   A bit heart breaking when a complete new one has to purchased.

How do the new ones fit to the boat and not become as two pieces.

Cheers

ken

The entire bottom end and steering case drop out of the steering gear on both the Graupner #1761, and #2335.
(and I don't have a drawer full)  %)

poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #8 on: January 08, 2018, 08:08:53 PM »

 Hi Ken.  This is one of the 2335 unit installed into my flying kestrel.   A part of the unit is in the vice to show you that it comes apart,
 when the top part of the shottle is stripped the bottom part of the nozzle and shaft drop down, the top part is fitted in the hull then
  the bottom half slides back in from the out side, hope this makes sense.

 John
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poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #9 on: January 08, 2018, 08:14:44 PM »

   
     These units are the new units from  Bauer Modelle.

     John

              PS sorry umi  2or 3 lol
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canabus

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #10 on: January 08, 2018, 11:58:21 PM »

Hi Mr Zippy
AS for a brushless motor times the KV to the voltage to get your revs, eg 600kv x 11.1v(3s)=6660 rpm, 600KV x 14.8v(4s)=8880rpm.
As for power the brushless motors have far more power, eg a L5055B-600kv (1600watts(about 2HP)), but, the main thing is a Lipo Battery to deliver the power.
As for ESC a car one with an electric fan on top is good for low speed as you cannot get the water flow for a water cooled one without a water pump.

Canabus
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mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #11 on: January 09, 2018, 12:04:41 PM »

Thanks everyone for the interesting replies,

I should have mentioned the Tug I'm researching is a large scale, big model around 30 inches of a Log 'Bronc'
the majority of full size caft are Schottel/Z/Outboard drive - that spin around on a sixpence,
leading me to think schottel drive for manouverability was the way to go.

The short, fat, deep hull with fluid dynamics of a house brick needs big brushless power to motivate the thing
driven in the manner of the full size craft with lots of full power forwards switching instantly
to full power in reverse - I'm thinking will quickly lead to wrecked gears etc.

A good comment has been mentioned about using simple, reliable and powerful old fashioned steerable nozzel,
and I have found a photo of a full size Bronc with conventional prop and nozzel that fits the bill, may go down this route.

While working on the plans, I'm trying to stop myself looking at the wonderful but hideously expensive $500+ Bauer all metal
Schottels for sale on the other side of the planet,
the price of these beauties plus good old uk import tax etc etc ?  It would be good sense investing a new lathe !

regards Paul
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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #12 on: January 09, 2018, 12:37:55 PM »

 Paul is it possible to post a photo of what you are looking at you may be looking at twin screw not single.
 
  John
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mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #13 on: January 09, 2018, 01:27:07 PM »

Hi John,

Yes of course, they are on Bauer-Modelle 60mm Schottel Drive at $522

http://www.bauer-modelle.com/epages/Bauer_Uwe46269592.sf/en_GB/?ObjectPath=/Shops/Bauer_Uwe46269592/Products/4.9431
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poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #14 on: January 09, 2018, 04:49:33 PM »

 Hi Paul  What area are  you from?


  John
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mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #15 on: January 09, 2018, 06:45:50 PM »

Hi John,

Leicester Midlands.  Paul
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poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #16 on: January 11, 2018, 08:59:54 PM »

Hi John,

Yes of course, they are on Bauer-Modelle 60mm Schottel Drive at $522

http://www.bauer-modelle.com/epages/Bauer_Uwe46269592.sf/en_GB/?ObjectPath=/Shops/Bauer_Uwe46269592/Products/4.9431
Hi Paul. this is the one I have 75mm It's not been in a boat yet.

John
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mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #17 on: January 12, 2018, 10:24:12 AM »

Hi John,

Very nice, looks like one of the Bauer units - but with nylon gears ? 
perhaps an early version of the current metal geared type ??

Paul
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poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #18 on: January 12, 2018, 01:25:11 PM »

  Could be for sale if interested.


   John
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chipchase

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #19 on: January 12, 2018, 09:01:13 PM »

Have you got a pair Poll ?

poll

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #20 on: January 12, 2018, 09:25:38 PM »

   Hi  Brian. Sorry only got the one. Could be a good pattern for  you
    Lol.


    John
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chipchase

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #21 on: January 13, 2018, 09:14:55 AM »

Cheers John i am just thinking ahead trying to save a bit of work, Stevns Arctic that i am working on at the moment is fitted with schottel drives.


Brian

mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #22 on: January 13, 2018, 10:35:32 AM »

Hi John,

Thanks for the offer, I've changed the hull shape and started the build using a Kort,
very interesting to see a metal unit,
was it a Bauer? or someone spending many hours in the workshop??

regards Paul
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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #23 on: January 13, 2018, 05:35:23 PM »

  Paul are you doing the log pusher like the Bronc? If not could you post a pici of your hull please.


   John
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mrzippy

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Re: Graupner Schottel Drive Unit II 2335 ?
« Reply #24 on: January 14, 2018, 03:22:47 PM »

Kort nozzel powered Bronc, see attached drawing if it views ok.
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