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. Therefore, 254 / 2 is 127 and 127 is prime. Which means its not possible to get a smaller gear that will divide exactly.
equivalent teeth on theoretical compound gear
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.
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.