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Author Topic: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale  (Read 2230 times)

Dreadnought

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #50 on: June 12, 2020, 02:27:28 PM »

Looks Great  :-))
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Geoff

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #51 on: June 12, 2020, 04:05:47 PM »

I agree, looking really good.


Geoff
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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #52 on: June 12, 2020, 05:05:01 PM »

thanks guys..
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ballastanksian

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #53 on: June 12, 2020, 08:20:45 PM »


The slightly deeper draught at the rear makes her look like the Captain has ordered all ahead full to engage the enemy and she is digging her stern in as she spools up her turbines/engines. I can imagine the sooty smoke as the stokers get busy with the shovels (or the oil sprayers were opened up  :} )


Anyhow, she looks gorgeous and will be great to see on a lake, perhaps one in Kettering next May.
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raflaunches

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #54 on: June 12, 2020, 11:37:31 PM »

Looking fantastic! I’m really impressed with the result so far. Can’t wait to see her on the water.
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Nick B

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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #55 on: June 21, 2020, 07:35:30 PM »

READY FOR SEA TRIALS....


well the funnels, main bridge, big ventilators, and main deck structures back as far as the aft bridge are fitted. also the torpedo tubes. the fore guns are temporarily mounted pending the turret rotation system.


and the basic electrics and software are functioning. so she's ready for sea trials (well actually a friend's swimming pool) planned for tuesday... exciting times. report to follow.


i've fitted a mini camera in the centre porthole just below the bridge. just for fun i tested it taking a snap looking a a picture of a ww1 fleet.  it's an actual image transmitted from the model looking forward over the guns, capstan and foredeck, with the model placed in front of a computer screen.   the idea is to be able to see the 'view from the bridge' when she's sailing.


(and a challenge for the sharp eyed - what's wrong/unusual about the pic on the screen?)



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raflaunches

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #56 on: June 21, 2020, 07:42:06 PM »

Are they German ships that she is tailing?
If they are British ships she is too far behind- should be in front screening the Battle Sqn. :D


Looking fantastic- she’ll look brilliant on the water.
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Nick B

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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #57 on: June 21, 2020, 09:27:38 PM »

well spotted Nick - correct  - German ships around the time of jutland....
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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #58 on: June 25, 2020, 12:58:24 PM »


SEA TRIALS REPORT


i'm delighted to report that the sea trial (aka test in a friend's pool) went remarkably well.


here's a link to a video.
https://drive.google.com/file/d/1_CxpOSRNiaY5FyZGBVZiwKiS1f4Qv9YV/view?usp=sharing
 ( btw if you get a 'couldn't preview' error from google drive,  just click on three dots on top right corner of the page and then click 'open in new window'. A new window with video will be opened and it should be ok. )


what went well:
 - the bluetooth control via the raspberry pi: faultless link, very responsive (you can see how confident i was getting towards the end of the video clip... – watching afterwards I flinched as it headed for the wall..! )
- ample power in the motors - if anything too powerful.  i must research 'scale speed' in a little more detail! (the original was capable of 32 knots, which i calculate to 3.75mph scale speed- the model is capable of well over that..) comments on this welcome!
- steering: the software 'mixer' for the motor/rudder control took a while to get used to, but had a very good turning circle at low speed going forwards- remarkably so given the size of the rudder. 
- the batteries lasted well (6 recycled 18650 lipos from old laptops:  4 for motors, 2 for control). minimal voltage drop after the whole trials session.


what I learned/need to correct/reflect on:
-   The list to port!! It comes from running the wires down the port side. I knew it was there, but wanted to see her under power before intervening too much. Should be easy enough to fix.
-   Steering in reverse – near impossible to helm anything except ‘straight astern’. Control is bound to be harder going astern, but need to look at the ‘soft mixer’ settings to see if it will improve.
-   Power ‘instant on’: The nature of the control via the ‘blue dot’ app means she can go to  full power almost instantly. (just put a thumb on that part of the control ‘dot’). A gradual build-up of power would be more realistic.  I think it’s mostly a matter of more gentle handling of the controller, which will come with practice.
-   I blew out a motor controller at the end of the trial: the starboard prop shaft seized due to the lock nut on the prop not being fully secure. Not a big problem, but in stalling the motor it blew out the l298n motor controller (symptoms: no longer controlling the motor, and power from the control pin leaking to the motor circuit.) Fortunately the pi was unaffected and I have a couple of spare  controllers. I have a 5 amp fuse on the motor circuit – maybe it needs a 2a fuse on each controller.. since they are rated “2A for 2 minutes / 1A continuous”


Overall a most rewarding session… she performed well, and I learned a lot.

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Geoff

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #59 on: June 25, 2020, 05:23:55 PM »

Very nice indeed! Well done and hope to see her at Mayhem in due course.


Cheers


Geoff
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ballastanksian

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #60 on: June 25, 2020, 07:00:11 PM »

Amen. I won't comment on the list as you have it covered  :-))  As for control of speed, if you can have a slower acceleration and an emergency engines ahead full just in case you need to evade a mad captain's Iron Duke  :embarrassed:  then that would be good. Definitly pop some fuses in, as it gets expensive making the magic grey smoke all the time  {:-{


It looks like you have some spare bouyancy for more detail if you plan to go all out.
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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #61 on: June 25, 2020, 07:15:55 PM »

thanks guys. comments appreciated.


i like the comment about keeping the emergency full ahead. actually it's the full astern that i was thinking of keeping for emergencies.! fuses are ordered


yes quite a lot more detail to add. smoke unit is the heaviest  item still to go on  - so if i can nudge that to the starboard side.......   



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raflaunches

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #62 on: June 25, 2020, 08:29:54 PM »

Looks fantastic John, as you say a little fettling and you’ll have a nice sailing destroyer which is pretty unique as far as I know. I’ll look to your next update. :-))
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Nick B

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JohnG

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #63 on: June 28, 2020, 12:48:25 PM »


smoke generator mk 1 - testing


the vaporiser arrived yesterday...... a first fit gives a rewarding amount of 'smoke'.   


https://drive.google.com/file/d/1_nhVUDUB0jNCf3_vbL0de9FTurmjjdVv/view?usp=sharing
[size=78%]( if you get a 'couldn't preview' error from google drive,  just click on three dots on top right corner of the page and then click 'open in new window'. A new window with video will be opened and it should be ok. )[/size]


as noted by geoff (v helpful comment - reply no 18 on  https://www.modelboatmayhem.co.uk/forum/index.php/topic,60314.msg637518.html#msg637518 )  the 24v vaporiser is quite big and needs headroom to function. something of a challenge to fit it into the space  - esp the headroom.  but then on the original, much  of the below deck space was taken up by the 6 boilers , so not so much changes..


i'd tried a small disk vaporiser, and was disappointed by the vapour generated. this is much more promising..


 i think i'm going to tweak the container to be wider at the top so there's more water and it will run for longer.



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ballastanksian

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Re: HMS Broke (1914) Flotilla Leader - scratch build 1/96 scale
« Reply #64 on: June 28, 2020, 06:42:09 PM »

Looking good  :-)) 
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