Leo's Scratch build - 3x C6-7
Nano V1 Rev 4 · firmware 1.65Secure logSecure logThe altimeter signed this log and it passed verification on upload, so the data is unchanged since the device wrote it.Signatures use Ed25519, which no current technology can forge.
Apogee
295.52m
8.14 s after launch
Max ascent
90.11m/s
peak ascent
Max during burn
11.42G
during the burn
Landing
42.96s
touchdown 5.96 m/s
ZOOM TO
Drag compenstateDrag compensated burnout gives the true burnout time vs the easy axis sign change across the zero point.0.959 to 2.12 sSwitches the chart to: Altitude, Thrust (drag compensated), Acceleration(Z)
s
s
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Flight summary
The flight, moment by moment
Liftoff
0 s
Rail angle1.8°
Rail kick14.35°
Launch detected
0.967 s
Altitude30.03 m
Velocity64.84 m/s
Burnout (first)
1.62 s
Altitude82.52 m
Velocity90.050 m/s
Apogee
8.13 s
Altitude295.52 Meters
Max tilt to burnout15.75°
Possible ejection
8.757 s
Altitude293.74 m
Velocity-4.74 m/s
Landing
42.96 s
Altitude-1.08 m
Max descent-29.13 m/s
Stability48.8%Fair
Launch straightness (20%)95.3
20% · Rail angle 1.8°
Coning · full (25%)56.9
25% · Coning 86.8/82.2°/s
Coning · boost (25%)59.6
25% · Spin 262.9°/s
Thrust straightness (30%)2
30% · Thrust 78.4%
Rocket information
Calculated from the flight data alone
Boost acceleration55.6 m/s²
average over the burn · 5.7 g
Coast deceleration13.8 m/s²
average · gravity plus drag
Ballistic coefficient179 kg/m²
fitted to the 6.51 s coast
Apogee lost to tilt1.48 m
flown vertical ≈ 297 m · from the tilt at burnout
Chute opening peak53.74 G
largest deceleration after ejection
Average descent rate8.61 m/s
ejection to landing · 34.20 s
Battery & temperature 87% → 78% · Temperature start 28.64 → 25.93 °C · Launch after startup 4m 40s
Altitude
Apogee295.52 Meters
Time to apogee8.13 s
Burnout altitude82.52 m
Max velocity altitude80.64 m
Ejection altitude293.74 m
Landing altitude-1.08 m
Recording altitude34.73 m
Velocity
Max ascent90.11 m/s
Max descent-29.13 m/s
At burnout90.050 m/s
Descent velocity-7.859 m/s
Ejection velocity-4.74 m/s
Landing velocity-5.959 m/s
Acceleration
Max during burn11.42 G
Max ascent11.42 G
Max descent53.74 G
Average ascent0.71 G
Average burn5.72 G
Times
Burnout (first)1.62 s
Apogee8.13 s
Possible ejection8.757 s
Landing42.96 s
Angles
Rail angle ?1.8° ± 0.28°
Rail kick ?14.4°
Max tilt to burnout ?15.75°
Orientation ?81.42°
Mount offset ?69.2° orientation setting looks wrong
Launch roll-28.31°
Launch pitch-80.24°
Max spin (burn)443.88 dps
Avg spin (burn)223.15 dps
Staging
Stages detected1
Burnout (refined)1.660 s
Stage S1 burnout
flip1.616 s
drag1.689 s
sig1.768 s
Recovery
Single deploy
No dual deploy detected on this flight.
General
Upload date13/09/26-19:08:17
Data samples10664
Total recording time60.134 s
Average samples/s177.3
Number of lockouts0
Launch after startup4m 40s
Reference axisZ
Battery & temperature
Battery start87%
Battery end78%
Temperature start28.64°C
Temperature end25.93°C
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User notes
A nice launch for Leo's scatch built 3x 18mm cluster. This flight flew perfectly on 3x Klima C6-7 motors.
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Youtube video
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Flight images 0
No images added
Flown as
Rocket
None
not linked
Motor configuration
Custom
3× Klima C6-7, set on this flight
Loaded weight
263.6 g
estimated, none entered
Measured burn
from this flight’s thrust
Total impulse, NFPA 1125needs the weight
rated 30.00 Ns
Burn time, NFPA 11251.65 s
0.00 to 1.65 s
Peak thrustneeds the weight
at 0.31 s
With no loaded weight the impulse would only give the motor’s rating back, so it waits for the weight. The burn time is measured either way.
Flight motors
1st stage · cluster of 3 · 7s delay
Burn time
1.6 s
Diameter
18.00 mm
Average thrust
6 N
Max thrust
15 N
Total weight
20.50 g
Propellant weight
9.60 g
Propellant type
composite
Links
Impulse30Ns
Max thrust45N
Burn time1.6s
Impulse classE
1st stage thrustloading curve…
Motor data by ThrustCurve.org
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Linked rocket
No rocket linked to this flight
Linked flights
Apogee spread100.5 – 295.52 m
Launch site, date & time
Imagery © Esri, Maxar, Earthstar Geographics
Click the map to place a marker · Drag to adjust
Canopy height from the Meta and WRI High Resolution Canopy Height Maps v2 (Meta and World Resources Institute, 2026; source imagery © 2016 Vantor), used under CC BY 4.0. Ground elevation built from Terrain Tiles (Mapzen and AWS Open Data), derived from 3DEP and GMTED courtesy of the U.S. Geological Survey, SRTM courtesy of NASA, and ETOPO1 courtesy of NOAA. Map and imagery credited on the view above.
Site nameTwycrossLat52.667949Lng-1.522803Ground level108.0 m · 354 ftLaunch date2026-09-13Launch time14:30
Taken from the NOAA GFS weather model for this place and time, so there is nothing to enter. Weather data by Open-Meteo.com (CC BY 4.0). The full weather for 48 hours either side, within 15 km, is in the tabs below and in Downloads.
Temperature21.5 °C
Sea-level pressure1020.3 hPa
QNH1020.6 hPa
Wind speed4.1 m/s
Wind directionW
Cloud coverOvercast
About sea-level pressure and QNH
Sea-level pressure is kept as given: the model’s own, or the figure entered from a forecast or report. QNH is that pressure the way an altimeter setting means it, through the standard atmosphere, and is what the adjusted apogee and the adjusted CSV use.
Model values, not observations. NOAA GFS: weather data by Open-Meteo.com (CC BY 4.0). Ensemble: NOAA GEFS.
Flight data animation
FLIGHT 2912
295.52 Meters
ALTITUDE
0.00m
VELOCITY
0.00m/s
ACCEL
0.00G
TILT
0.00°
PITCH
0.00°
ROLL
0.00°
YAW
0.00°
TIME
0.00s
AWAITING LAUNCH
ALT
altimetercloud.com
LAUNCH
T+0.00s
LANDING
BURNOUT
Motor burn complete
Note: Flight profile animation requires your altimeter to be mounted in a fixed orientation that you choose in your settings. For best results please calibrate your sensors as well.
Rocketry Ltd
Nano V1
Compact altimeter for small rockets. This flight was flown on a Nano V1.
Hardware version Rev 4Software version 1.65Last online 13/09/26-19:08:17
Specifications
Electronics
- Microcontroller
- ESP32-S232-bit ESP32-S2 240MHz
- Accelerometer
- ST LSM6DSO3232G 3-axis (SPI)
- Barometer
- Bosch BMP581300 to 1250 hPa within specification
- Gyroscope
- ST LSM6DSO322000 dgps 3-axis
Logging
- Maximum sample rate
- 833 Hz
- Most samples in a log
- 38,000
- Longest log
- 1 h 3 minAt 10Hz although default settings are 433Hz with 1:8 hybrid mode
Electronics
- Microcontroller
- ESP32-S232-bit ESP32-S2 240MHz
- Accelerometer
- ST LSM6DSO3232G 3-axis (I2C)
- Barometer
- Bosch BMP581300 to 1250 hPa within specification
- Gyroscope
- ST LSM6DSO322000 dgps 3-axis
Logging
- Maximum sample rate
- 833 Hz
- Most samples in a log
- 38,000
- Longest log
- 1 h 3 minAt 10Hz although default settings are 433Hz with 1:8 hybrid mode
Size, weight and battery
- Size
- 20 × 10 × 8.9 mm
- Weight
- 1.65 g1.65 g with the smallest battery
- Battery voltage
- 3 to 4.2 V
- Battery life
- 5on the smallest battery
- Size
- 20 × 10 × 8.9 mm
- Weight
- 1.65 g1.65 g with the smallest battery
- Battery voltage
- 3 to 4.2 V
- Battery life
- 5on the smallest battery
Documents
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Settings, as they were for this flight
General flight settings
Forecast pressure
i
Set this to your local forecast pressure at sea level. This will offer you slightly improved accuracty for your flight, although it's not 100% essential every little helps!
Xcweather.co.uk is a decent place to grab pressures from for your location and time.
Xcweather.co.uk is a decent place to grab pressures from for your location and time.
1013.2 mbar
Launch detect
i
This is the altitude above the launch pad altitude where the altimeter will trigger itself into recording / flight mode.
The altimeter keeps a constant average of the pressure while waiting for launch, it uses a simple algorithm and the pre-flight buffers to do this. The most recent 120 samples (~4 seconds) are ignored so your pre-trigger altitude won't effect the ground baseline.
For almost all uses we suggest keeping this on the 25 Meter (~82 feet) default settings. If you want to test your altimeter by throwing it in the air, or are planning a very low flight you may want to lower the setting.
The altimeter keeps a constant average of the pressure while waiting for launch, it uses a simple algorithm and the pre-flight buffers to do this. The most recent 120 samples (~4 seconds) are ignored so your pre-trigger altitude won't effect the ground baseline.
For almost all uses we suggest keeping this on the 25 Meter (~82 feet) default settings. If you want to test your altimeter by throwing it in the air, or are planning a very low flight you may want to lower the setting.
30 meters
Sample ratio
i
The altimeter runs at 50Hz however you can record every sample or every X samples in order to extend the log time. For example if you set the ratio to 1 it will save 1:1 samples, or if you set it to 3 it will save 1 in 3 samples.
1:1:1 (400Hz)
Max samples
i
This is the maximum samples the altimeter will log per flight. When it reaches this amount it will stop and save the recording.
38000
Recording stop
i
This setting is how the altimeter decides to stop recording. You can choose either 450 (~9s) or 900 (~18s) samples stable or it will record until the max samples limit unless you press the BUTTON in Manual stop mode.
The samples stable method waits for the devices altitude not to change for the set number of samples. This is defined by not changing by more than +/- 1.0 meters for 98% of the samples, it's a reliable method to stop the recording after landing within 8-10 seconds (300 sample) or 16-20 seconds (600 sample).
The samples stable method waits for the devices altitude not to change for the set number of samples. This is defined by not changing by more than +/- 1.0 meters for 98% of the samples, it's a reliable method to stop the recording after landing within 8-10 seconds (300 sample) or 16-20 seconds (600 sample).
Auto: 8s stable altitude
Oversampling
i
Oversampling is a internal setting of the BMP 390 pressure sensor. It is how many samples are taken for each reading. By taking multiple samples for each pressure reading the altimeter reduces noise and increases the resolution of the output.
The sensor can run at 50 samples per second in 4X mode, so we suggest leaving it in this mode as it will offer the highest accuracy.
The sensor can run at 50 samples per second in 4X mode, so we suggest leaving it in this mode as it will offer the highest accuracy.
16x Oversampling
IIR filter
i
The IIR filter is another internal sensor for the BMP390 pressure sensor. It is a Infinite impulse response filter used to enhance pressure measurement accuracy by reducing noise. It's primarily for smoothing out rapid pressure changes.
We suggest not setting this too high as it will cause delay to changes in altitude if set very high.
We suggest not setting this too high as it will cause delay to changes in altitude if set very high.
COEFF 7
Pressure filter
i
This filter is a software Kalman filter that runs on the altimeters processor.
The Kalman filter uses a prediction step based on a system model and then a correction step using new measurements to refine its estimate, it creates accurate most certain results from data with noise in it.
The Kalman filter uses a prediction step based on a system model and then a correction step using new measurements to refine its estimate, it creates accurate most certain results from data with noise in it.
TruePath
Sample speed
i
The sample rate of the altimeter's sensors. 50Hz takes 50 samples per second, 100Hz takes 100 samples per second for higher resolution data.
400 Hz
Hybrid mode
i
When enabled, the altimeter records at full speed during ascent then switches to half speed after apogee to extend recording time during descent.
Enabled
Sync sensors
i
The filters on the pressure sensor can cause it to lag very slightly behind the Accelerometer and Gyroscope data.
The Sync sensors option detects how far out of sync these sensors are. It then corrects the Acceleration and Gyroscope readings to match the pressure sensor.
ENABLED (46 samples / 114.88ms)
Orientation
i
This is the orientation you intend to install the Altimeter in your rocket. It's needed to ensure completly accurate angles and orientation charts and reports. Check out the Manual for more information on this.
Down (text up)
IMU filter
i
The IMU filter, or fusion filter takes the data from each axis of the Gyroscope and Accelerometer to calculate the Pitch, Roll, Yaw and tilt angle from vertical.
These filters can build up some discrepency over time so it's important to calibrate your sensors to minimise this.
Madgwick 6-Axis
Launch ALP
i
This is prevention against accidental launch detection.
With this disabled the launch is based only on pressure and something that creates a low pressure can trigger the flight by accident. For example pulling your nose cone off can even trigger it.
With this enabled the rocket also needs to have seen 8 samples (0.25 seconds) of acceleration above this setting in the last 3 seconds as well as the pressure drop to trigger. There is a backup trigger of 1.05 seconds of altitude being above the launch detect setting too.
There are very few situations where this option would cause issues, so we suggest leaving it on.
With this disabled the launch is based only on pressure and something that creates a low pressure can trigger the flight by accident. For example pulling your nose cone off can even trigger it.
With this enabled the rocket also needs to have seen 8 samples (0.25 seconds) of acceleration above this setting in the last 3 seconds as well as the pressure drop to trigger. There is a backup trigger of 1.05 seconds of altitude being above the launch detect setting too.
There are very few situations where this option would cause issues, so we suggest leaving it on.
2.0G
Launch lock
i
When enabled, the altimeter locks out recording for a set period after power on to prevent false triggering during setup.
DISABLED
Static temperature
i
A fixed temperature value used for altitude calculation when the external temperature sensor is disabled or not connected.
15 °C
Sensor calibration
Calibration offsets used during this flight.
Gyroscope⚠ Gyroscope has not been calibrated
X0.000°
Y0.000°
Z0.000°
Accelerometer⚠ Accelerometer has not been calibrated
X0.000 mG
Y0.000 mG
Z0.000 mG
Files
Where the altimeter signs its log, the file carries that signature and a tick beside it. A tick means the data is unchanged since the device wrote it, which is what a record claim needs.
CSV
2912.csv ✓ SIGNED
The log as columns of text. Opens in a spreadsheet, and in every simulator that reads flight data.
1022 KB
LOG
2912.aclz ✓ SIGNED
The altimeter's own compressed log, exactly as the device wrote it. This is the file to keep for a record claim.
129 KB
WX
2912_weather.json.gz
The weather for 48 hours either side of the launch, within 15 km of the launch site: NOAA GFS every hour, at the surface and up to about 31 km, and the NOAA GEFS ensemble where this site holds it. JSON, gzip compressed. Weather data by Open-Meteo.com (CC BY 4.0) and NOAA. For 2026-09-13 14:30 local time at 52.6679, -1.5228.
1053 KB
Adjusted CSV2904 recalculated in your browser
The log recomputed for your own sea-level pressure and temperature. Columns: time, altitude as recorded and adjusted, raw altitude as recorded and adjusted, pressure.
This file is built here from the signed log, so it carries no signature of its own. Anyone verifying a claim should be sent to the flight page and build their own from the original.
Custom CSVbuilt in your browser
Pick any of the chart’s data sets, the worked-out ones included, and the part of the flight to cover. Values come in the units the chart is set to.
In the file
Time span
One row for every time any chosen data set has a sample. A data set with no sample at that time is left blank rather than filled in. Built from the chart’s data, so it carries no signature.
Share this flight
Anyone with the link can view this flight; nothing else on your account is shared.
Chart snapshot
A PNG of the chart exactly as you have it set right now: the series you have switched on, your zoom, your labels and any pressure correction applied.
Hotlink images
Stored images of the whole flight, altitude only, not your current chart view. Transparent, regenerated whenever the flight changes, and safe to hotlink on a forum.
QR code
Links to this flight page. Useful on a range card or a club display.
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