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Neptune mod, or late to the party.

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Re: Neptune mod, or late to the party.

Postby Bigdave » Sun Feb 09, 2014 10:23 pm

Wow! :shock:
The sub ran great. The new motor and prop really powered the Neptune through the water.
It was so much fun!!
For about 1 minute. :roll:
Then I popped the fuse. :?
So what does this dummy do?
Put in a bigger fuse. :oops:
Well I popped the bigger fuse.
So not satisfied with that I put in another bigger fuse and may have damaged the ESC.
O well, I kind of figured the stock ESC was the weak link.
But it was fun while it lasted. :mrgreen: BD.
David Welch
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Re: Neptune mod, or late to the party.

Postby Bigdave » Mon Feb 10, 2014 2:02 pm

Well as an update it turns out the motor was bad.
I had rebuilt it but I guess the timing was off or something.
The ESC is fine.
If not for the fuse it may have been a different story. :roll:
And not the one with the happy ending. :mrgreen: BD.
David Welch
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Re: Neptune mod, or late to the party.

Postby Bigdave » Sat Feb 15, 2014 4:09 pm

Well I have decided to give a small brushless motor a try.
I had the parts in the dockyard so it's worth a try.
I am going with a Turnigy 450 outrunner motor. It has 250 watt output but is about 1/2 the size of the brushed motor.
The 890 KV rating should get me to almost the prop speed of the Viper motor.
The motor has a 4 mm shaft so it was to big for the stock 1/8" coupler.
So I made a 4mm coupler on my lathe.
I was able to modifi a airplane type motor mount I had in my parts bin to mate the outrunner to the Neptune motor mount assembly.
The outrunner motors cool through the stator so the Neptunes mount being in the water on the outside will add some water cooling.
I should be able to do some current and temp tests next week. BD.

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David Welch
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Re: Neptune mod, or late to the party.

Postby Sub culture » Sat Feb 15, 2014 5:59 pm

Should pull the prop round well enough. Can't help thinking you're shoving a small block in a Fiat 500 though. Something in the range of 400-500kv would still give lively performance I'd have thought, bearing in mind a modest 20 watts gets the Engel 212 moving pretty swiftly at around 5000RPM shaft speed.
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Re: Neptune mod, or late to the party.

Postby Bigdave » Sun Feb 16, 2014 12:11 pm

I would rather have used less A less KV motor but the 890 was the only one I had that was close.
BTW A small block in a 500 sounds cool! :mrgreen: BD.
David Welch
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Re: Neptune mod, or late to the party.

Postby Sub culture » Sun Feb 16, 2014 12:33 pm

Not a 500 but its more angular successor the Fiat 126. Crazy stuff!

'Why are you staring at an empty pond?'

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Re: Neptune mod, or late to the party.

Postby salmon » Mon Feb 17, 2014 1:20 am

What grease do you put in the drive shaft?
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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Re: Neptune mod, or late to the party.

Postby Sub culture » Mon Feb 17, 2014 6:02 am

I would think a bit of silicone grease will work well enough.

The shaft seal is basically a small oil seal, most likely moulded in nitrile rubber, which is compatible with pretty much all lubricants. I think from memory it also has a small spring around the sealing component, which may rust if left ungreased, unless it's been made from stainless steel.
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
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Re: Neptune mod, or late to the party.

Postby Bigdave » Mon Feb 17, 2014 10:37 am

I used Racers Edge marine grease. It is made for lubing the shafts on model the race boats.
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Douglas, 20K
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Re: Neptune mod, or late to the party.

Postby Bigdave » Mon Feb 17, 2014 10:40 am

Sub culture wrote:Not a 500 but its more angular successor the Fiat 126. Crazy stuff!


How about a Fiat X19.
Now that would be cool. 8)
David Welch
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Douglas, 20K
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Re: Neptune mod, or late to the party.

Postby Sub culture » Mon Feb 17, 2014 12:27 pm

Think they all dissolved into rust.
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
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Re: Neptune mod, or late to the party.

Postby salmon » Tue Feb 18, 2014 7:52 pm

Thank you for your help. Tonight or tomorrow I will be water testing the sub.
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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Re: Neptune mod, or late to the party.

Postby salmon » Wed Feb 19, 2014 3:24 am

And it turned out to be tonight. Not sure if Sam or I was more excited.

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It ran perfectly with no leaks. Tomorrow full hull installed and trimming if necessary. I think I need to open the vent and drain on the tail cone. Any reason not to? Any other areas that might need opening up?
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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Re: Neptune mod, or late to the party.

Postby Bigdave » Wed Feb 19, 2014 9:40 am

Excellent!
The front section drains very poorly too.
I noticed that with mine a few weeks ago.
Larger openings in both ends would help.
I like the black planes. 8)
Were you able to switch out the prop?
She is great fun when you can get some thrust behind her. :mrgreen: BD.
David Welch
Commodore SR-8

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"Eat your pudding Mr Land". "I ain't sure it's puddin" James Mason-Kirk
Douglas, 20K
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Re: Neptune mod, or late to the party.

Postby salmon » Wed Feb 19, 2014 10:05 am

Thanks Big Dave! Larger drainage, duly noted. The prop on this sub came with the purchase and I am not sure if it is a performance prop or not. It is a black plastic three bladed prop that the front and back are cut to make it fit. Still considering ordering a new one, but that will be after we get it running in the lake or pool so we can judge whether it is already "fast".
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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