Air compressor

October 27, 2021

Unit conversion 1 inch = 25.4mm 1 bar = 14.5 psi (pounds per square inch) 1 cfm = 38.3 lpm (litres per minute) 1hp = 0.75 kW Air compressor Garnet grit blasting requires a free air delivery (FAD) of 18-22 cubic feet per minute (500-700 litres per minute) of airflow at at least 100 pounds […]

Kinetic art wind spinner

October 1, 2021

Kinetic Wind Spinners from Evergreen Garden   Anthony Howe – Di-Octo   Ivan Black – Hex   Ivan Black – Vane Series (disc square star)       Ivan Black – Golden Section   George Rickey – Breaking Column The location of the pivots is not critical.  The closer to the base, the more counterweight […]


August 1, 2021

Shed – Drainage

May 30, 2021

Challenge “I haven’t allowed to connect up the drainage just the underslab pipework.” The underslab pipework connection to the septic is a concern.  We may not have sufficient vertical distance to connect a shed floor waste and toilet to the septic line.  We can’t afford to end up with a shed where the greywater / […]

Split mainsheet traveler

May 17, 2021

The idea is that rather than anchoring to a single point at the centre of the traveller track, you anchor to two points, one off to either side of centre. This means that there is always one rope with a component of its tension that stops the car from moving, even when centered. This is […]


May 8, 2021

Photographs Click images to zoom in. Design Click button in lower right corner for full screen video playback.   Bathroom is 1200mm wide x 4000mm long.  Shower base is 1200mm x 1200mm. Elevations Click images to zoom in. North: East: South: West: Requirements 5 bay shed (patio, living, garage, garage, garage). 8000mm wide x 20000mm […]

Ben’s stuff

April 15, 2021

A friend handed me this box of remote control goodies that were sitting on a shelf in need of some attention for me to have some fun with. Car HSP Racing 1/8th scale electric rock crawler. 2S 7.2V NiMH 1800mAh batteries with KET plug. Charger is a 9V 250mA DC wall adapter with Tamiya plug […]

ESP8266 Weather Station

February 28, 2021

Heltec Wifi 8 ESP8266 microcontroller with CP2104 USB to serial chip Integrated 0.91 inch 128×32 I2C IIC Serial Blue OLED LCD Display 3.3Vdc to 7Vdc 32MB Flash WiFi Kit 8 Source Files Based on: weather.php.txt espweather.ino.txt Instructions Create ibay esp8266 (HTTP only; not HTTPS) Add domain and point it to ibay esp8266 Add […]

A Class catamaran – rigging

February 14, 2021

An A class catamaran has: Mast rotation Outhaul Downhaul Mainsheet Mast rotation There is a 30cm long horizontal stainless steel ‘arm’ on the bottom of the mast that has a rope connected underneath the trampoline cleated on top of each hull.  The idea is to restrict the mast from over rotating when sailing upwind. When […]

ESP8266 ESP-12E big digits NTP clock with date, time, temperature, humidity, pressure (barometer)

January 13, 2021

ESP32  vs ESP12 boards ESP32 boards are more powerful and come with interesting onboard features.  ESP32 boards are slightly more expensive and may differ between the different flavours: ESP32 boards (Wemos D1 mini, AiThinker) ESP32 TTGO LoRa32 SX1276 OLED ESP32 TTGO T-Camera with PIR sensor and OLED display (and microphone). For our needs the […]