Over the weekend we have almost perfect sun shine. So I collected some data on a 20 Tube solar collector. Here are the results.
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)
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.
min. Flight Time:
Mixed Flight Time:
Hover Flight Time:
Motor @ Optimum Efficiency
Motor @ Maximum
Motor @ Hover
Current @ Hover:
P(in) @ Hover:
P(out) @ Hover:
Efficiency @ Hover:
Current @ max:
P(in) @ max:
P(out) @ max:
Efficiency @ max:
est. rate of climb:
Total Disc Area:
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 have extracted the ROM images from the two 27C512 chips inside the DXY-1300. I then passed them though a disassembler. This produced the asm files respectively below.
RolandDG_R15209223_LH53140H_8949E is the more interesting because it contains z80 code that starts at 0100h.
The asm files have beep passed as all code. However they need to be separated into data and code. As there is HPGL data starting around E000h in the R15209223 file and likely numerous other sections. This HPGL is the test image that is drawn when the device is powered on holding down the enter key.
I woke early today to test video recording with the Raspberry pi. Using the camera module. Here is the video below. It is quite shaky but it was also a bit windy. I would have liked also to use a gimbal to position the camera. I intend to do this using the two extra channels on the transmitter.
Realising there is no documentation on the internet to calibrate these oscilloscopes.
I have a GOS 653G Or a (ISO-TECH ISR658G) and wanted to calibrate it. Note that powering up the unit will give better calibration results as the CRT warms up and the power supply reach a static voltage. Ensure this is the case before calibration.
Oscilloscope Cursors board Top back
I have identified 5 variable resistors on the cursors board. This is the board that is controlling the cursors drawn on the screen. There are some things one needs to be aware of when trimming these.
1. The cursors need to be at the extremities of the screen as these need to be aligned to the edge of the graticule.
2. These need to be adjusted with caution and in ratio to the zoom variable resistor located near the CRT tube ref.