09-15-2017, 12:40 PM
Join Date: Aug 2017
| | Re: DIY battery gravel vac, or hacking a ready made one
A couple random thoughts, then!
One is that a smaller tube will be passing near the same amount of water so it will be a faster flow and appear stronger. Some paying with different sizes might find one you like. This idea is why they build the big tube on the end of the commercial siphons. It lifts the sand but then drops it before it gets caught in the smaller tubing and removed completely.
For a longer lasting battery one might play with adding more batteries connected in parallel so that the voltage remains the same but the total capacity is doubled. Depending on what is wanted, it might be good to find some of the higher capacity dry change batteries of the same voltage as the siphon. Things like those used for emergency lighting or alarms systems, Motorcycle or RC cars might be prospects for higher capacity.
For higher voltage to make the motor spin faster, we begin to get over into burning the motor if we push it too far but most take tank a bit more than rated. Cars are rated at 12VDC but often see 14 volts for long periods when running. Danger here is you begin to run a 12V motor on 20 volts, though!!!
Got any thoughts on what type and voltage the tiny motor currently runs on? Two "D" cells put end to end to give about 3 volts, maybe?