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[Subculture]

If the appropriate LED is getting a feed, then it's likely to be an issue with the relay.

[Subculture]

Perhaps consider bonus points for those substantially coming under budget?

3d printed hulls fair enough, but perhaps not the first thing...

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Easy relay to get, e.g. https://www.ebay.co.uk/itm/203293820637

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They've been busy little bees this time- eight pages worth of spam posts!

[Subculture]

Gear them down around 2:1, assuming a 12v system and they’ll be fine.

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Is that a YB-49, Dave?

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It was like that when I visited the Gosport museum about fifteen years ago.

A lot of the corrosion happened after it was removed from the...

[Subculture]

Here is a side shot of Holland 5. Unfortunately this boat is now on the sea bed covered in marine growth, so not the greatest for reference. The Rn submarine...

[Subculture]

Got it from this website

https://www.nauticalarchaeologysocie...-no5-submarine...

[Subculture]

I beleive the periscopes on the four boats were all slightly different, certainly differences between Holland 1 and Holland 5, the latter I believe got...

[Subculture]

Is the inner shaft running in bearings/bushings or up against the full length of the outer shaft/tube?...

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BTW, if your tanks are pulling 3.5A at 12 volts- 42 watts for a free running tank, then something is definitely out of whack. An Engel tank draws about...

[Subculture]

Either will work.

[Subculture]

Okay so going back over the figures I realise I made in error in the first stage of gearing, and your final ratio is taller at around 10.8:1, which would...

[Subculture]

So you didn't mention the tooth count of the Emaxx gear, but a quick google throws up something around 65 teeth, so along with the other stage of reduction...

[Subculture]

I don’t know what pitch the gears are on the Emaxx. Most car gears in the 1/8-10th scale are usually metric pitched and somewhere in the region...