Sticky: "The fact that it works at all - let alone working this well - is just plain wizardry"
SIP HorsePower Dyno(MicroDyno) for Android -unlike all other Dyno Apps out there- doesn't use the acceleration or GPS sensor, because both aren't exact enough to achieve a good measuring result.
SIP HorsePower Dyno(MicroDyno) can measure the rpm of the engine by analyzing the exact frequency, recorded with the microphone (Screenshot 1: in the middle you can clearly see accelerating in 1st, 2nd and 3rd gear).
The faster the rpm increases, the better the performance of the engine. The gear ratio of our rides remains the same as long as there is no shift of gears. This way, the speed can be calculated from the rpm just as you can then calculate the performance by the change of speed which equals acceleration.
To obtain the most realistic performance value possible, you need to enter a couple of values as precisely as possible:
- overall weight
- tire circumference
- air pressure
- gear ratio
- Cw-Value (Tough one, but if you don't change this for different runs, you get repeatable and combarable results, this value moves the resulting curve on the y-axis, so it can be used to calibrate the dyno. If this value is way off the result can be off about 2 PS)
If you know the Windows programs SIP Dyno and GSF Dyno, you know how exact these measurements are.
You can find a couple of comparisons between GSF Dyno, this App and a real dyno (P4) at www.siphorsepowerdyno.de and in the Scootering from January 2013.
- This App only works if there is no shift in gears. The method doesn’t work with automatic scooters.
- This App might not work for cars. It was tested on Vespas and Lambrettas which have a 1 cylinder 2 stroke engine.
Please be aware that this is a very technical App. I cut the important things down as much as i could and added a "?-Button" on every page inside the App. Please read the information carefully.
Check out www.siphorsepowerdyno.de or my YouTube-Channel for a tutorial.
If you have any problems, contact me and I will guide you through.
Important: There is a software failure in some Samsung Galaxy Ace and Samsung Galaxy Young devices.
I included a fix for this, in Settings-> scroll to bottom ->"Samsung Fix"
Supported by SIP Scootershop GmbH
The altitude is calculated using the barometric formula and is reasonably accurate against a mechanical altimeter up to around 10,000 feet. The variometer uses a simple scalar Kalman filter to help stabilise the needle. A future enhancement will be to implement a matrix based filter to improve the responsiveness of the varometer.
Altitude has been tested whilst soaring in sailplanes and paragliding, and is about half a second response slower than a dedicated hardware variometer but never the less provides a very usable vario.
More from developer
GNSS, such as US GPS or European Galileo or also GLONASS, are satellite navigation systems with global coverage. They are mainly composed of a space segment (several satellites often on a Walker constellation), a ground or control segment (ground stations spread over the globe surface) and a user segment.
SpaceSim-GPS depicts and simulates such systems in a 3D environnement. Different modes allow to have a real-time representation of the system, with:
- computation of the visibility for each satellite with respect to the user position. You can find out exactly which satellite is flying above your current position (provided a GPS is available and enabled on the device)!
- computation of the precision (DOP).
- computation of satellite attitude control (earth pointing and solar panel rotation to maximise illumination and power as it would be done in reality).
- update the constellation status with almanacs (the app downloads the latest almanac on user request).
- use the touchscreen to zoom in or travel around Earth, or the Moon! As you travel around, take a minute to observe the sky and identify some constellations...
- click a satellite to have its information.
- add your customised spacecraft constellation!
This application is for educational purposes and it is NOT intended for location.
If you find bugs, please report by email. Thanks!
- artificial horizon / gyro attitude indicator,
- compass (magnetic)
- speed meter (groundspeed, vertical speed)
A HUD mode allows using the application for augmented reality.
Real-time measurements and estimations can be exported to a text file for post-processing (e.g. into MATLAB, SciLab or Octave). Note: the Pro version allows sending those data through WiFi.
** IMPORTANT ** : depending on your device, please consider going through the covariance settings for best estimation of the attitude! The EKF may disregard the measurements if deemed unreliable. If YOU THINK the app does not use the gyroscopes, please CHECK the variance settings for the gyroscopes.
For best performances, accelerometers, gyroscopes and magnetometers must all be present on the device.
Optional requirements: GPS, camera. (HeadUp Display will only be available when a camera is available)
NOTE ABOUT THE FULL VERSION:
The full version of this app includes:
- 3D gyro compass,
- transmission of data (acceleration, gyro, etc.) over wifi,
- improved estimation of the vertical speed with GPS measurements included in the Kalman filtering*,
- improved estimation of heading in magnetic perturbed environments,
- estimation of the position and velocity,
- ground track tool,
- Google Map inclusion,
- layout selection (landscape, portrait, multiple panes),
- dashboard to display current data values,
- multiple panes display on large devices,
- and many more...
* In the lite version, position data comes from GPS measurements only. Furthermore, the vertical speed is calculated from GPS measurements and can thus only be of limited accuracy.
The application is provided as-is, without any warranty. The application is not certified for navigation purposes by any agency or organisation.
If you find bugs, please report by email. Thanks!
Tested on Samsung Galaxy S2.
Design you own Apollo mission, and much more...
KeplerSpace is the first application for Android that helps you design space trajectories! Your mission, should you choose to accept it, is to find the best trajectory you can within your allocated budget!
KeplerSpace will help you design space trajectories around the Earth and to the Moon! KeplerSpace allows to:
✔ Propagate to construct trajectories (multiple propgators are available),
✔ Place maneuvers to change your orbit (impulsive or continuous low-thrust burns),
✔ Use the solver to compute your maneuver efficiently,
✔ Perform Hohman, Bi-Elliptic, ... transfers
✔ Detect events such as passage through node, perigee, apogee, ...
✔ Switch on the sensors to see which ground regions you can observe from your polar orbit!
Technically, most of the real missions in the Earth-Moon system can be simulated, although that might no be an easy task!
As the second application in our educational series, we wanted to produce a tool that helps specialists as well as novices in space trajectory design to quickly come up with some preliminary design solutions.
Keywords: space, mission analysis, trajectory, Earth, Moon, orbit, space mechanics, Kepler, Hohman.