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Author Topic: After a long long break - its time for another model  (Read 1278 times)

justinhow

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After a long long break - its time for another model
« on: October 13, 2016, 08:21:14 AM »

In about 2002/3 I built the Model Slipway Yorkshireman tug which is still going strong. Built with Decaperms etc
I have now decided the time is right to do another and I am getting the Model Slipway Tamar RNLI boat (2 x 40mm prop), so I am on the lookout for build photos on these forums and elsewhere - I have some already but pointers to more would be appreciated.
I have also decided to go brushless and my initial shopping list looks like:
  • 2 x Turnigy D3536/8 1000KV Brushless Outrunner Motor, 430watts, OR Turnigy D3542/6 1000KV Brushless Outrunner Motor 665watts
  • 2 x Hobby King brushless car ESC 2S-4S 60A w/Reverse (7.4v-14.8V)
  • Action Electronics P40E Marine Motor Mixer
  • 2 x Turnigy Heavy Duty 5000mAh 3S 60C Lipo Pack
  • Bow thruster?
Does this seem reasonable?
Which motor of the two above (assuming either is appropriate)?

It will be controlled through a Frsky Taranis X9D RC system so I have great flexibility on setting max power, power curves etc.
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canabus

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Re: After a long long break - its time for another model
« Reply #1 on: October 13, 2016, 08:52:04 AM »

Hi Justin
The Hobbyking car ESCs HK-60A SL with program card is a great choice.
The program card is very easy to use.
My setup is in my Sea Hornet 2015 post on modelboats forum.
Good choice of batteries and the Zippy Compact ones are OK too.
Our club uses 3639-750, 3639-1100,  3548/4-1100 and 3648-1450, all will run on the 60A ESC.
Also the 40mm props(2 blade) work on all these motors.
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justinhow

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Re: After a long long break - its time for another model
« Reply #2 on: October 13, 2016, 09:47:42 AM »

Hi canabus
Thanks for this useful feedback and I will investigate the motors you use. They seem to be a little more powerful than the ones I suggested.
I notice you say "2 blade prop". The kit appears to come with a 3 blade prop - is this OK or are you specifically recommending a 2 blade instead?
I will check out your Sea Hornet 2015 post.
Any views on the merits of a bow thruster?
Cheers
Justin
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canabus

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Re: After a long long break - its time for another model
« Reply #3 on: October 13, 2016, 12:31:54 PM »

Hi Justin
I had tried a 3 blade 37mm prop, but on my Sea Commander, better low performance and top performance I felt in was a bit slower.
I also have 4 different 2 blade props and the different in these is about the same.
Bow thruster I have never had one.
These motors are ones I have used and I only had one bearing go.
This made the ESC cut in and out which took a bit of time to work out as no one it the club had this problem.

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justinhow

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Re: After a long long break - its time for another model
« Reply #4 on: October 14, 2016, 08:40:55 AM »

Thanks again - so it looks like I am on the right track.
Interestingly I don't think I need a mixer as the FrSky Taranis OpenTX software can do pretty much the same thing on the receiver
I set up the main throttle stick to drive 2 channels and therefore each ESC has a dedicated channel. This can then be programmed (mixed) to reduce/increase the power on each channel (and therefore ESC) depending upon the left and right movement of the steering stick. You can even use "curves" so that there is very little effect when modest left/right movements are made, but gets more aggressive when moving towards the extremes of left/right.

Re controlling too much power (as I may have) - you can also use one of the rotary pots on the receiver to set the overall gain on the throttle channels, so if I have too much power (and therefore the stick is only is usable in 50% travel) I can just dial it down.
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canabus

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Re: After a long long break - its time for another model
« Reply #5 on: October 15, 2016, 12:19:58 PM »

Hi Justin
Looks like you are on the right track.
I changed the throttle curve on my Sea Hornet and it's tame up to half throttle and after that it's a little rocket!!!
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