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Author Topic: 1/16 Trent Refurb  (Read 7254 times)

JimG

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Re: 1/16 Trent Refurb
« Reply #25 on: March 24, 2017, 11:06:54 AM »

  • I also note the ESC seems to be 'fixed' rigidly in position. I am no expert in this area, but quite a few manufacturers and other electrical experts I know say that both the servos and ESCs should be fixed using the soft [foam] servo type tape so that vibration 'feedback' is kept to a minimum. Please keep us informed.
Kim [C.C.].

There is a lot less need for soft mounting modern electronics as they are no longer so susceptible to vibration. Now that most components are surface mounted to the board  vibration no longer affects them. In electric flight servos are commonly rigidly mounted without the grommets with no problems, even receivers are no longer foam padded, often just held in place with velcro.

Jim
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Canterbury Coxswain

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Re: 1/16 Trent Refurb
« Reply #26 on: March 24, 2017, 11:27:31 AM »

Thanks Jim,
I'll balance that against other information received.
Kim
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IKB

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Re: 1/16 Trent Refurb
« Reply #27 on: March 24, 2017, 11:45:32 PM »

Hi Guys,


Quick update on where I am at with the gearboxes, at this point I was hoping to report that both units were now installed and I was all set for lake trials tomorrow, sad truth is, I have had to revisit the CAD as I based the original unit around the same dimensions of the old motor mount, this was fine in principal, but I failed to realise that the gears on the back now added extra length to the whole assembly, leading to a clash with the prop shaft UJ, it also didn't help that the ESC sticking out the side was clashing on the speaker that hangs down between the motor positions.
Hopefully learning from my mistakes this time, I have shifted the gears and motor away from the propshaft and relocated the ESC, fortunately there is plenty of room between the motor and hull for it to go, I will re-print these in the morning and hope o be down the lake late tomorrow afternoon for trials.


Alex
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IKB

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Re: 1/16 Trent Refurb
« Reply #28 on: March 27, 2017, 12:03:24 AM »

Hi Guys,


Managed to get down the lake this afternoon for some trial runs of the new gearboxes and I am calling this a success, manoeuvrability is vastly improved in the harbour, less learner driver lurching through a 3 point turn and more graceful pirouetting on a sixpence  :-))
Out on open water, unbelievably, the top end is still too high, although the sticks are much further advanced than without the gearboxes, there is more speed than the boat can handle, at least not without an active trim tab system to bring the bow back down, it was very pleasant to note though that even with steel on steel gears, the noise was not all that great, I may try a revised version with a lower gear ratio in the future, but for now, I want to concentrate on finishing off the re-wire / LED lighting overhaul.


Video from the lake trials: https://youtu.be/NGtUXKrloxU


Alex
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Canterbury Coxswain

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Re: 1/16 Trent Refurb
« Reply #29 on: March 27, 2017, 09:59:56 AM »

Alex,
Those are nice looking units and I'm pleased that you are happy with the end result. The video is a great bit of footage and really shows the realistic wake left behind! Which unit did you use to record it? Finally, that's a nice facility you have there to run your boats around - most impressive. Which Club is it?
Continue to allow us to see your progress, it's helpful.
Kim [C.C.]
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derekwarner_decoy

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Re: 1/16 Trent Refurb
« Reply #30 on: March 27, 2017, 11:58:25 AM »

Alex...it is very interesting to try & understand where the source of bulk of the driveline noise is actually attributable

There are some resonances combined with mechanicals and harmonics which are totally understandable

I would suspect that you could near discount the brushless motors ......apart from a higher frequency whine........

One consideration is to lightly coat the pairs of metal gears with an extremely viscous material.....[albeit I say a lubricant] ....more like pitch  :o

I do understand that the initial current consumption even at low RPM will be higher than expected......

If it does not work, Pitch like products are soluble with kerosene....so I think it may be a valued trial  O0

Derek
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Derek Warner

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david48

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Re: 1/16 Trent Refurb
« Reply #31 on: March 27, 2017, 01:10:15 PM »


Open gear lubricant  ,Rocol do a aerosol for open gear trains . IT is really  tacky ,or it was when I last used it .
David.
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derekwarner_decoy

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Re: 1/16 Trent Refurb
« Reply #32 on: March 27, 2017, 01:34:55 PM »

Thanks David....

RTR-Rocol was exactly the thought ....but the obverse must be the question as to the amplification of sound  <*< within a hull ...

Derek
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Derek Warner

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IKB

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Re: 1/16 Trent Refurb
« Reply #33 on: March 27, 2017, 10:37:18 PM »

Hi Guys,


Replies to your question below:


  • Kim - Camera? I am using an old GoPro Hero 2, this is the same camera I record all of my POV stuff with, it is tough & reliable, plus not badly priced these days as now considered, "old hat"
  • Kim - Location? I am a member of Bridlington Model Boat Society, we have a purpose built 80 x 90m lake, which is about waist deep everywhere, a very pleasant place to spend time
  • Derek /David - Lube? The gears had a smearing of propshaft grease on, just to help relieve the metal on metal friction
Alex
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IKB

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Re: 1/16 Trent Refurb
« Reply #34 on: April 01, 2017, 04:05:11 PM »

Hi Guys,


Have decided to lower the gearbox ratio again, it might be a touch low this time, (but this is based on the gears I have on the shelf) at the moment the setup is:


  • 24 / 30 = 0.8 x 9990 = 7992 RPM
New setup:


  • 15 / 30 = 0.5 x 9990 = 4995 RPM
Back in CAD I have modified the previous model for the new setup, the advantage of CAD is that you can go back and change things again and again, I have made a short video showing the differences between the two ratios:


https://youtu.be/UPov4cCmOt8


Alex
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IKB

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Re: 1/16 Trent Refurb
« Reply #35 on: April 02, 2017, 11:15:31 PM »

Hi Guys,


No lake testing this weekend, but progress is still being made, been doing some CAD work on the vapor tank as at the moment I am having an issue with vapor coming back through the fan, the fan becomes saturated and refuses to work, it is also proving difficult to efficiently move the vapor along the tubes and out of the exhaust ports, so I am going to try relocating the fans, as well as doubling up for more positive airflow.


I have also been working on the LED refit of the entire boat, most of which is straightforward enough, remove old GOW bulbs and swop in LED replacements, in some instances however, a little more thought is required to achieve the end result I desire, the deck flood lights for instance, these are white metal castings in the original kit, I am retro-fitting 1.8mm LEDs into them, unfortunately, in order to get the bulb to sit properly, the legs need to pass through the body of the light.
Now this is an issue, as white metal, as it's name suggests, is made of metal, metal being conductive causes some issues with electricity, now I could paint / lacquer the legs of the LEDs, but this didn't really look all that neat and I was after a resolution with a bit of finesse, so I opted to model the light in CAD and reproduce them in black resin on my Formlabs SLA printer.. having toys is awesome  :-))
The black resin is great, non-conductive, the lights need to be black anyway and I can make them so that the LED just drops into the new custom body, the photo is a comparison between the original and white metal lights and a first try SLA version, I have since tweaked the dimensions and re-printed a set.


More to come soon


Alex   
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IKB

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Re: 1/16 Trent Refurb
« Reply #36 on: April 20, 2017, 09:56:19 PM »

Hi Guys,


Had the Trent down the lake in glorious bank holiday sunshine for testing and the new ratio works well, you can now push the throttle all the way forward without fear of the boat wanting to roll over, the top end looks very scale and maneuvering at low speed is a breeze, however, although everyone agreed the top end looked very scale, it's not very exciting as a model boat anymore and I will either be sticking the old ratio back in or a half way house.


Alex
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surfer71

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Re: 1/16 Trent Refurb
« Reply #37 on: June 14, 2018, 01:10:44 PM »

Brilliant I have just got hours of bed time reading !!!
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IKB

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Re: 1/16 Trent Refurb
« Reply #38 on: June 23, 2018, 02:14:45 PM »

Hi Guys,


Planning to have the Trent back on the lake this weekend with a small change to the drivetrain, more on this as and when it happens


Alex
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surfer71

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Re: 1/16 Trent Refurb
« Reply #39 on: June 26, 2018, 10:40:42 AM »

well I am toying with getting a 3D printer but it's mine field out there!!

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