Building the little Kilo submarine

[redboat219]

Manfred, with your initial plan of activating the lpb with a mechanical switch, those micro pumps are only rated to around 3V, how were you going to power the pump?

[MFR1964]

Romel,

I've used in the past two ways, one is, tie it into the 4,8 volt from the BEC, second is, use a resistor into the circuit of the LPB motor, for 12V it will be around 11 Ohm, for 6 V around 5 Ohm, this wil limit the voltage.

Manfred.

PS: Did a checkup on my stock, all those LPB's are rated 6V, not really sure why you have the 3V variant.

[RCSubGuy]

Romel,


PS: Did a checkup on my stock, all those LPB's are rated 6V, not really sure why you have the 3V variant.

I was about to say that. I've run them at 12V for short bursts with no issues at all...

[MFR1964]

Same for me Bob, have them inside the V80, running them on 12V also, the one venting the ballasttank has a 11 Ohm resistor inline, this one has to work longer for venting the ballasttank, the other is used for the peroscopes, only short bursts needed.

Manfred.

[He Who Shall Not Be Named]

I was about to say that. I've run them at 12V for short bursts with no issues at all...

Same here with the 3V units. But, being the Conservative guy I am, I do (but not always) put an 11 Ohm resister in series with one of the LPB's input wires.

[redboat219]

Romel,

those LPB's are rated 6V, not really sure why you have the 3V variant.

Thank you for pointing it out.

The one's I initially saw were rated to 3v but yes there are 5v variants available.

[MFR1964]

Some more work on the SD, i did counter a problem,





In this configuration i started with testing, everything worked, but the motor wasn't spinning at full speed, at the end i found out it was a 12V motor instead of a 6V motor.



Had to breakdown the complete configuration, found a 6V motor and glued it low tech on the bulkhead, if needed it can be replaced by braking the glue joint.



The new build-up with the 6V motor, added the steering rods and shimmed the shaft of the motor to 4 mm (using a 4 mm lipseal)



Since i use 1,5 mm rods, i had to alter the standard seals for the shafts, by drilling a slightly smaller hole you compress the O rings, after that you glue them down, giving you a good seal on the steeringshafts, did this trick some time ago on the type XXIII SD, still working without problems.


Manfred.