Jasmine completed the 0.5 kilometer trail twice round as the Thameside Nature Discovery Park https://www.essexwt.org.uk/nature-reserves/thameside on the 10th of September. We are very proud of Jasmine, I’ll be honest I did not think she would make it twice round the trail, given the heat today. We also tried to raise funds for charity and the sum exceeded all our expectations. I also believe she could be the youngest to complete this event at 14 months, she only started walking about 2 and half months ago, Amazing. https://www.justgiving.com/page/jasmines1ktoddle?fbclid=IwAR2_LAmDn3JwtfXu24xNXBse71VPTFvzpL6p1huEDLAExgXZdbZnl3Mwr60 So Lucy and I would like to thank all those who supported her.
This train known as the No 45690 Leander passed through, it was assisted by the diesel engine as the rear.
Lucy gave birth to Jasmine on Friday the 8th at 7:20am. She went into strong labor at 5:00am. I called the hospital and described the situation, they asked to speak to Lucy but holding a phone call was a stretch too far at the moment. We quickly got in the car and made our way to Basildon hospital with very little traffic. It was a beautiful sunny morning when I stuffed the car diagonally across the disabled area (sorry) but no one else was there 🙂
Lucy’s water broke as she literally got out the car and we made out way to the maternity unit. After knocking on various doors and walking, what seemed like lengthy corridors, we were ushered in by the nursing staff. Lucy was monitored for 30 minutes where we could also hear the relief of that heart beat, which was at 160bpm at that point then dropping to 140bpm. The first midwife was Jepu Lungie whom was part of the night staff. She handed over to Rebekah who was there until the birth. After the initial 30 minute observation Lucy was given NO2 (Nitrogen oxide, gas and air). This relieved the contractions that were coming. Then, after what seemed like no time, Lucy was told to start pushing. Fifteen minutes later Jasmine was born.
Lucy and I would like to give a massive thank you to every one who has sent cards and gifts, we are very grateful and appreciate the support.
Have you ever wanted to just plug your phone / audio device straight into a car radio. Here are the details to connect a 2.5mm audio jack or Bluetooth receiver into a standard car radio. The car is a Ford focus 2003 the radio model is a 6000cd. The pictures below show the solder points. there are 4 points that represent each speaker. So if you had a quadraphonic input source you could have it control each speaker individually. However, I am using a stereo Bluetooth output device so I paired red and white and black and red (thicker) together.
There are 4 connectors solder point inside the radio that will amplify a standard line signal.
Here is a gearing program that runs on Linux (wine) or Windows that can be used to deduce other gear combinations. Note that the 127/100 compound gear is not used. This magical gear is what makes the lathe exactly metric. The lathe, like most, has an 8 TPI imperial lead screw. The 127/100 effectively allows the imperial lead screw to have a 100 metric divisions. This is because 1 inch is equal to 25.4 mm and therefore 50 inches is exactly 127 centimeters. Therefore, 254 / 2 is 127 and 127 is prime. Which means its not possible to get a smaller gear that will divide exactly.
|lead screw||inches||mm||equivalent teeth |
As you can see the table above lists theoretical gears with impractical numbers of teeth. This is made practical by another compound gear the 72 / 18 which is a ratio of a 1 / 4. 12.7mm / 508 is 0.25 which provides the metric basis to work with. The other gears provide ratios of on this.
This is a link to an online gear calculator.
Over the weekend we have almost perfect sun shine. So I collected some data on a 20 Tube solar collector. Here are the results.
|Temp in||Temp out||difference|
The pump rate was at 6 liters per minute (0.1 liters second). So give this its possible to work out how much of the suns energy was being captured. We just need to know one more thing. The specific heat capacity of water. Which is 4.2 Kj / Kg / degree C. That is 4.2 kilo Jules per kilogram per degree C.
So the calculation turns out to be.
Total Energy per second = (Specific heat capacity of water) x (Liters per second) x (Temperature difference)
1.68 kW = 4.2 * 0.1 * 4
It turns out that a microwave can be easily fixed. The symptoms are luke-warm food.
Here from the image above you can see the cracks in the magnets. These develop because the heating and cooling of them over time fatigue the fragile compound they are made from. I therefore, bought a new Magnetron (love that word) and plugged it in. It has now been working for over a year without issue.
The specification of the quad are as follows.
Load: 10.64 C Voltage: 14.28 V Rated Voltage: 14.80 V Energy: 62.16 Wh Total Capacity: 4200 mAh Used Capacity: 3570 mAh min. Flight Time: 4.8 min Mixed Flight Time: 16.9 min Hover Flight Time: 32.9 min Weight: 452 g 15.9 oz
|Motor @ Optimum Efficiency Current: 4.68 A Voltage: 14.55 V Revolutions*: 4886 rpm electric Power: 68.1 W mech. Power: 59.3 W Efficiency: 87.0 %||Motor @ Maximum
Wattmeter readings Current: 44.72 A Voltage: 14.28 V Power: 638.6 W
|Motor @ Hover Current: 1.63 A Voltage: 14.71 V Revolutions*: 2027 rpm Throttle (log): 26 % Throttle (linear): 44 % electric Power: 23.9 W mech. Power: 19.4 W Power-Weight: 77.1 W/kg 35 W/lb Efficiency: 81.2 % est. Temperature: 28 °C 82 °F specific Thrust: 13.05 g/W 0.46 oz/W||Total Drive Drive Weight: 1069 g 37.7 oz Thrust-Weight: 3.5 : 1 Current @ Hover: 6.51 A P(in) @ Hover: 96.3 W P(out) @ Hover: 77.8 W Efficiency @ Hover: 80.7 % Current @ max: 44.70 A P(in) @ max: 661.6 W P(out) @ max: 516.2 W Efficiency @ max: 78.0 %||Multicopter All-up Weight: 1250 g 44.1 oz add. Payload: 2541 g 89.6 oz max Tilt: 71 ° max. Speed: 40 km/h 24.8 mph est. rate of climb: 5.0 m/s 984 ft/min Total Disc Area: 58.58 dm² 907.99 in² with Rotor fail:|
RCTimer motors 5010 motors 360
17″ Carbon fiber propellers blades.
Carbon fiber frame
Here is the eCalc link to an online calculator that can be used to approximate the build and estimate its flight capabilities.
I discovered an interesting thing about xor today. It can be used to encrypt data. Depending on how its used, it can be part of the strongest theoretically unbreakable encryption or the weakest.
The first example, where it is the strongest, is when it is used in a “one time pad”. A one time pad is a mechanism for encrypting data. Specifically where the Key data is the same size as the data that you want to send. This is often called the “plain text”. So the three ingredients are the
- “exclusive or”
- Random data.
- The useful data one wants to send.
To represent 2 and 3 I have two images.
The image above is the Key.png this is our random data.
The file above is our data we want to encrypt and send.
convert Hello.png Key.png -fx “((255-u)&v)|(u&(255-v))” XORHelloKey.png
The image above is the encrypted version of our data. This was generated by xor’ing the message with our random data. It looks random, I hear you say, and you’d be correct. In fact very correct. You are looking at the “holy grail” of encryption. This is the starting point of where all encryption begins. This is the unbreakable cipher. This is because we have used 100% random data to encrypt it. Ok, so why don’t all systems use this and why does computer code cracking even exist. Well, there is one “huge” downside to this method. You would have to exchange the Key secretly with someone you wanted to send the message to. Needless to say this method is not used today to support https transfers.
Ok whats next? Suppose you could transfer tones of random key data secretly between you and a friend. You could communicate secretly with unbreakable encryption. You could until you run out of secret random data, that is, using this xor method. For if you were to recycle that data just once then all hell breaks lose. The image above is the second message I want to send and the image below is the encrypted xor’d version of it. Using the same key as above.
Great looks random enough and it is. However, the fact that the same key has been used twice, means that when they are xor’d together then the image below is produced.
And that is the result. It is like looking at a negative. However quite readable. If your on a Linux box you can easily, replay this for yourself using the commands and downloading the image files. Using image magic its possible to “xor” images on the command line. Enjoy.