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    Hints and Tips.
    SIMPLE SPRAY BOOTH. Hi Guys, My simple spray booth is just a cardboard box with a transferable
    filter
    unit. The
    filter
    unit is made using a small fan,scrap Balsa wood, a bit of plastic mesh and a couple of layers of toilet tissue. Made a small box section from the Balsa wood and attached it to the fan. Fitted a piece of plastic mesh then two layers of toilet tissue then the final piece of plastic mesh. Fitted a flange to the Balsa box section. Cut a hole in the back of the cardboard box so that the fan unit fitted snugly in. Slid in my turntable,connected power and Bingo, works perfectly. When the cardboard box gets old and tatty just replace it with another cardboard box. Cut out a hole for the
    filter
    unit and that is all you have to do. If the
    filter
    gets clogged then replace it with a couple more pieces of toilet tissue. Looking on eBay something similar will cost you ยฃ68.00. Martin555.
    1 month ago by Martin555
    Blog
    Fire Monitors Part 4
    The boat has a water cooled ESC and engine mount. These are fed from a scoop behind the prop. The water circulates through the ESC and engine mount and then out through the exhaust ports on the transom. The first attempt at plumbing in the monitors was to simply tap into this cooling circuit, add a
    filter
    and pump and feed the pumped water to the monitors. This didn't work too well. With the pump running the monitors worked well, but water was sucked backwards out of the cooling circuit, drawing air in through the exhaust ports until the pump was sucking on air and the monitors stopped working. I had sort of expected this might occur so I had a non return valve available ready to fit in circuit just before the exhaust ports to prevent this reverse flow. I had hoped I would not need to fit it as I am concerned that the extra flow resistance it will cause will reduce the effectiveness of the cooling circuit. The second, unexpected problem with this simple approach was that, with the pump off, there was enough water pressure in the cooling circuit that the monitors continued to dribble water onto the cabin roof from where it drained into the hull. Adding the non return valve in the cooling circuit would only serve to make this problem worse owing to the increased pressure in the circuit. The last thing I want is for the boat to slowly fill with water, drenching all the electrics and gradually sinking so this dribble needs to be stopped. After some thought, I decided that a diverter valve could be the solution. This would route the water either to the pump and monitors, or to the cooling circuit. I reasoned that I would not want the monitors working while the drive motor was running at high speed and so can afford to switch off the cooling circuit while the monitors are operating. I had an interesting few hours making a servo driven cam mechanism which at one end of it's travel would squash the silicone tube to the cooling circuit while allowing flow to the pump and monitors. At the other end it would cut off the water to the pump, and enable the cooling circuit. The servo would be driven by the same channel as the RCswitch that turns the pump on/off. Great idea, but it didn't work ๐Ÿค” The servo doesn't have enough power to turn the cam and squash the tubes and simply stalls. I need to try thinner tubes, or a more powerful servo, or something? Any helpful suggestions welcome... Throughout the summer I have tried to keep the boat sailable for the local club sessions on a Wednesday afternoon. Not wanting to have to keep it in dry dock for an extended period while solving this issue I tried a different approach. I had available two solenoid valves so these were pressed into service as shown in the sketch. An RCswitch was constructed so that, with the pump on, valve A is closed and valve B is open. This routes the water flow to the pump and monitors. With the pump off, valve A is open and valve B is closed, routing the water to the cooling circuit. This works! In the video (my first ever on YouTube) you can see how water flows from the exhaust ports when the monitors are off. I don't have a test tank at home so water is fed into the water scoop connection using a small aquarium pump. Now I just need jbkiwi to solve the smoker challenge so that I can add some smoke ๐Ÿ˜
    2 months ago by Graham93
    Response
    Re: Fire Monitors Part 2
    Thanks Rob, Yes, I did try them before I painted them and was pleased with the water throw. If I was to make them again, I think I would arrange for the nozzle to screw on to the front of the monitor to allow it to be dismantled and flushed out. Iโ€™m going to fit a
    filter
    in the pipework but I suspect Iโ€™m going to have problems with blockages on the lake. Good point about securing the pipework. Would hate to watch the boat slowly sinking in the middle of the lake. Regards Graham
    2 months ago by Graham93
    Forum
    Motor reversing
    Houston - 13. "I have a problem. I think my WTC tube is not good." "Thirteen - Houston. Aha! What you need is a
    filter
    adaptor made from cardboard, sticky tape and an old sock!"๐Ÿ˜‚๐Ÿคฃ
    5 months ago by RNinMunich


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