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Author Topic: New Shannon Class kit, on its way!  (Read 77846 times)

Neil

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Re: New Shannon Class kit, on its way!
« Reply #450 on: December 07, 2017, 04:06:13 PM »

When we get that far I can run through what settings are needed for the Shannon, remember these motors never run in reverse !
:-)) :-)) :-))
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #451 on: December 07, 2017, 04:09:05 PM »



Yes we got there in the end Neil, further back up the thread  :-))


I was asleep, and and only just caught up........watching "Shane" on C15  for the umpteenth time tends to do that to me, lol.


you guys will have to explain for us mortals what the "C" on the batteries means, and such other things....bit baffling really.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #452 on: December 07, 2017, 04:14:13 PM »

 :-))



https://www.youtube.com/watch?v=Oda0JYzGG3w




Basically multiply the Mah by the C rating to get the amps that can flow


5000MAH or 5amps times 30c = 150 amps   5000MAH time 20C = 100 amps   etc
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ANDY
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #453 on: December 07, 2017, 04:27:40 PM »


cheers andy..............


so what do these motors such as the 1250 and 1800 draw in amps/hour from a battery on full chat............brushed and gell cell batteries are so much easier for me to understand lol.


neil.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #454 on: December 07, 2017, 04:27:51 PM »

My order with slightly more torque slightly slower servos due to stock.


ESC
https://hobbyking.com/en_us/hobbyking-90a-boat-esc-4a-sbec.html



Under 2 hours and my order is packed and shipped  :-))
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #455 on: December 07, 2017, 04:30:07 PM »

cheers andy..............


so what do these motors such as the 1250 and 1800 draw in amps/hour from a battery on full chat............brushed and gell cell batteries are so much easier for me to understand lol.


neil.




The amps are on the spec at hobbyking and as Kinmel linked to earlier 56 amps for the 1250KV so the 90 amp ESC is the best option as the only other reasonable alternative is 60 amp rated and too close for safety.


EDIT the 1800KV is rated at 30 amps so a lower rated ESC say 40 / 50 amps would do
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ANDY
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #456 on: December 07, 2017, 05:36:21 PM »





The amps are on the spec at hobbyking and as Kinmel linked to earlier 56 amps for the 1250KV so the 90 amp ESC is the best option as the only other reasonable alternative is 60 amp rated and too close for safety.


EDIT the 1800KV is rated at 30 amps so a lower rated ESC say 40 / 50 amps would do


so in effect the smaller motor fitted to the larger boat has to work harder at higher rpm to shift the same water to drive the jets and boat, and therefore is using more juice from the battery, needing a larger ampage esc..........am I right, or not.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #457 on: December 07, 2017, 05:39:19 PM »

It's not a smaller motor, it just turns slower driving a bigger impeller or screw or am I wrong  {-)


Edit Still knocking on the door of 14,000 rpm driving a bigger screw
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ANDY
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #458 on: December 07, 2017, 06:10:39 PM »


It's not a smaller motor, it just turns slower driving a bigger impeller or screw or am I wrong  {-) 

Edit Still knocking on the door of 14,000 rpm driving a bigger screw




ahh, right.............got it now.....cheers.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #459 on: December 07, 2017, 06:14:37 PM »

Some experimentation is likely required. If there isn't enough poke then there is the option to use a 4S battery giving 25% more revs. Hopefully Kinmel will beat us to it with that  8)


3S is 11.1volts x 1250rpm (13,875)   4S is 14.8volts x 1250rpm (18,500) etc


every S is worth 3.7volts
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #460 on: December 07, 2017, 06:35:46 PM »


Some experimentation is likely required. If there isn't enough poke then there is the option to use a 4S battery giving 25% more revs. Hopefully Kinmel will beat us to it with that  8)


3S is 11.1volts x 1250rpm (13,875)   4S is 14.8volts x 1250rpm (18,500) etc


every S is worth 3.7volts


thanks andy...........most appreciative of your info........I myself have been contemplating swapping the 55's in my little ST200 sea plane tenders with brushless, and have always been "terrified" of doing anything because I haven't a clue about them, but with all this info, feel a lot more confident about the transition.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #461 on: December 07, 2017, 06:40:25 PM »

Rest assured I am far from the font of all knowledge myself  {-)  This forum/U tube and google are the resources  :-))
I am learning rapidly
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ANDY
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Thornej

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Re: New Shannon Class kit, on its way!
« Reply #462 on: December 08, 2017, 07:27:17 AM »

Hi Andy,
any thoughts on non water cooled ESC - thatís a complication I might want to avoid. :-)
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Jeff

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Re: New Shannon Class kit, on its way!
« Reply #463 on: December 08, 2017, 08:02:29 AM »

No ventilation and high currents itís a no brainier. Canít possibly be a problem itís only a bit of screen wash tubing  :-))
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ANDY
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kinmel

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Re: New Shannon Class kit, on its way!
« Reply #464 on: December 08, 2017, 08:44:47 AM »

Hi Andy,
any thoughts on non water cooled ESC - thatís a complication I might want to avoid. :-)

My Tamar with bigger motors had no trouble without water cooling, it is very rare that you will be pulling 56amps.  Most of those amps are only needed during sudden acceleration from stopped to full power.   

It had 30amp fuses and I don't remember blowing any, we just program the Esc for a low value "punch" and that limits the amps fed in while the motor spins up to speed.

At full power on 4S,  the pair of motors in the 1:12 will supply up to 1.6 horsepower, that will be way over scale and an awful lot of torque will be available too.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #465 on: December 08, 2017, 08:53:26 AM »

See  {-)


What made you choose the water cooled on this occasion? Or will you be leaving the pipes off?
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ANDY
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kinmel

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Re: New Shannon Class kit, on its way!
« Reply #466 on: December 08, 2017, 09:12:28 AM »

See  {-)


What made you choose the water cooled on this occasion? Or will you be leaving the pipes off?

I won't bother connecting them at first, it is better to have the option there than to add it later.

If they seem hot during initial trials it is easy enough to plumb them in, no need for a pumped system.
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Thornej

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Re: New Shannon Class kit, on its way!
« Reply #467 on: December 08, 2017, 09:17:44 AM »

Interesting and very creative Kinmel! I wouldnít have thought about not connecting 👍
Good one!  :-))
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Jeff

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Re: New Shannon Class kit, on its way!
« Reply #468 on: December 08, 2017, 09:41:31 AM »

My pair of 1:12th jet drives have just arrived and the ESCs and servos from Hobbyking are due on Monday.

Subject to weather, trials will start on Tuesday, or Wednesday.
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T33cno

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Re: New Shannon Class kit, on its way!
« Reply #469 on: December 08, 2017, 09:58:34 AM »

 :-)) O0 8)
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Neil

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Re: New Shannon Class kit, on its way!
« Reply #470 on: December 08, 2017, 11:36:51 AM »


My pair of 1:12th jet drives have just arrived and the ESCs and servos from Hobbyking are due on Monday.

Subject to weather, trials will start on Tuesday, or Wednesday.


Hi guys, when you put up your builds of the Shannon, especially the fitting of the water jet drives could you put it up step by step please with photographic diary as my mate in Canada is flying blind and solo on this and really could do with measurements, centres outer measurements for the inlets, outlets etc so that he can start his models which he is most eager to do.........your prototype building with all info would be a fantastic help to him.


Thanks, on behalf of Mick , neil.
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kinmel

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Re: New Shannon Class kit, on its way!
« Reply #471 on: December 08, 2017, 12:40:43 PM »

At your command...

It's snowing so no working outside today cutting holes in the hull.

I do not have any drawings or instructions for fitting the motors into the hull, but it is pretty straight forward.

First off, these are incredibly detailed castings. I studied Llandudno's Shannon on Monday and there are no differences between the real drive casings and the model's.  You can see why Hamilton has allowed their name to be displayed on the buckets, exactly as they are on the real ones.

Within the limitations of scaling these are the most accurate castings of anything available to modellers. 

The shaft rides in brass bearings at each end, please note that the impellor in photo 12 is actually very smooth and sharp edged, the light has created the illusion of an imperfection.

First study the 10 photos in this post and the 2 in the post after it ( 10 photo limit per post ) and then and most of the installation is self-explanatory.

Photo 9 is a pattern for drilling the hull, but I don't think I need it.

There are 2 small indents marked on the hull, see photo 10.  Using each indent as the centre, use a hole saw to drill the pair of 36mm holes.

The impellor housing (photo 11 ) has a 35.7mm collar which fits through the hole from the outside.

You can then put the inlet housing inside the hull (photo 2), it will not fit onto the protruding collar because the actual inlet has to fit through the bottom of the hull.

Line it up as close as possible and draw a pencil line around the suction inlet on the inside of the hull.  Cut out the marked area and trim it so that the inlet fits perfectly on the collar.

Once happy everything is lined up, mark up the 4 bolt holes on the hull and drill them out.


I will have to stop there because the Trim Tabs have not arrived yet and I don't know if they are held in place by any of those 4 mounting bolts.

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kinmel

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Re: New Shannon Class kit, on its way!
« Reply #472 on: December 08, 2017, 12:41:25 PM »

Last 2 photos..

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Neil

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Re: New Shannon Class kit, on its way!
« Reply #473 on: December 08, 2017, 01:04:56 PM »


these are magic, kinmel. thank you


easy to read, understand and follow. thanks.


i'll be s[peaking to mick tonight so will tell him that the build has started............as you can probably tell, he is eager to get on with it.


neil.
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T33cno

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