Flight ID: 1785

Lil Nuke - Flight with 4 altimeters - 2

Flight summary

Altitude

Apogee

756.69 Meters

Time to apogee

11.49 seconds

Burnout altitude

117.73 m

Max velocity altitude

142.75 m

Ejection altitude

208.57 m

Landing altitude

-1.66 m

Stability

Stability score

85.3 / 100 (Excellent)

Launch straightness (20%)97.4

Coning · full (25%)93.9

Coning · boost (25%)77.8

Thrust straightness (30%)76.4

Launch tilt 1° · Coning 25.4/53.3°/s · Spin 444.5°/s · Thrust 94.9%

About this score

Worked out from the flight log between liftoff and 80% of apogee, independent of the angle the altimeter was mounted at in the airframe.

Launch straightness (20%) – how close to vertical it left the rod.

Coning · full (25%) and Coning · boost (25%) – how much the nose swung off the rocket's own axis. The main factor.

Thrust straightness (30%) – how cleanly the motor pushed along the body.

Spin about the rocket's own axis is not counted against it — a fast, straight spin is stable. The line under the bars shows the raw measurements.

Velocity

Max ascent

155.11 m/s

Max descent

-10.35 m/s

At burnout

146.410 m/s

Landing velocity

-7.032 m/s

Descent velocity

-6.432 m/s

Ejection velocity

132.02 m/s

Recovery

Single deploy (no dual deploy detected)

Acceleration

Max ascent

31.08 G

Max descent

43.02 G

Max during burn

16.85 G

Average ascent

1.2 G

Average burn

11.73 G

Times

Burnout (first)

1.38 seconds

Apogee

11.49 seconds

Possible ejection

1.989 seconds

Landing

129.3 seconds

Output #1 ON

0 seconds

Output #1 OFF

0 seconds

Angles

Launch pad tilt

1.25°

Thrust calc pad tilt

1°

Max tilt to burnout

25.78°

Launch roll

-1.10°

Launch pitch

-0.55°

Max spin (burn)

3004.37 dps

Avg spin (burn)

340.71 dps

General

Upload date

14-Jun at 15:01

Data samples

12572

Total recording time

154.900 s

Average samples/s

81.1

Number of lockouts

Recording altitude

41.04 m

Launch after startup

7m 9s

Reference axis

Battery & temperature

Battery start

62%

Battery end

42%

Temperature start

26.38°C

Temperature end

27.17°C

MT1 launch temp

0°C

Output rules

No rules configured

Flight data animation

FLIGHT 1785

756.69 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

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.

User notes

A test of 2x Mercury and 2x Nano altimeters in a Lil Nuke with a G80 Aerotech motors.

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Youtube video

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Flight images (0)

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Linked rocket

✅ Active

My Lil Nuke #1

LOC Precision — Lil' Nuke

✈️ 7 flights linked

Type

Kit build

Diameter

57.4mm

Length

749.3mm

Dry weight

368.5g

Mod

Modified

Stages

Fins

Recovery

Parachute

Chute

61cm

Body

Loc paper tube

💬 7 comments · 👍 2 reactions

View rocket

Sim data from sim files

Motor	Alt	Vel	Accel	Apogee	Source
Estes A8-3	135.3 m	64.8 m/s	29.6 G	4.5 s	RockSim (estes_viking.rkt)
Estes B4-4	282.9 m	105.3 m/s	30.0 G	6.1 s	RockSim (estes_viking.rkt)
Estes B6-4	288.1 m	116.9 m/s	31.0 G	5.9 s	RockSim (estes_viking.rkt)
Estes C6-5	475.1 m	171.4 m/s	34.4 G	7.5 s	RockSim (estes_viking.rkt)
Estes C6-7	483.1 m	171.4 m/s	34.4 G	8.1 s	RockSim (estes_viking.rkt)

Device information

Mercury V1

This flight was flown on a Mercury V1.

Hardware version

Rev 3

Software version

2.40

Last online

14-Jun at 15:01

Accelerometer

32G 3-axis

Gyroscope

2000 dgps 3-axis

Pressure sensor

Bosch BMP 581

Magnetometer

N/A

Flight motors

1st Stage

AeroTech

G80T-10

Details ▾

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Motor burn

The dashed line is the combined thrust curve for your motors (data from thrustcurve.org), scaled so its peak matches the recorded acceleration maximum — the shape is meaningful, the absolute level is not (your rocket's weight is unknown).

Launch site, date & time

Click the map to place a marker · Drag to adjust

Lat— Lng—

✓ Launch location saved successfully.

✗ Could not save location — please try again.

Output rules

Rules allow the Mercury to take actions based on flight conditions. Each rule has up to 4 conditions (A-D) that must be met before the action triggers.

Rule 1

After launch onlyANY condition (OR)Active during lockout

ACTION:OUTPUT #1

Conditions

AData 300>0

BHighest Gyro axis (dps)>0

CAcc magnitude (G)>0

DAcc magnitude (G)>0

❌Did not trigger

Rule 2

After launch onlyANY condition (OR)Active during lockout

ACTION:Action 6000000

Conditions

AData 250>0

BAltitude above pad (m)>0

CAltitude above pad (m)>0

DAltitude above pad (m)>0

❌Did not trigger

Rule 3

After launch onlyANY condition (OR)Active during lockout

ACTION:OUTPUT #1

Conditions

AAltitude above pad (m)>0

BAltitude above pad (m)>0

CAltitude above pad (m)>0

DAltitude above pad (m)>0

❌Did not trigger

Rule 4

After launch onlyANY condition (OR)Active during lockout

ACTION:OUTPUT #1

Conditions

AAltitude above pad (m)>0

BAltitude above pad (m)>0

CAltitude above pad (m)>0

DAltitude above pad (m)>0

❌Did not trigger

Rule 5

After launch onlyANY condition (OR)Active during lockout

ACTION:OUTPUT #1

Conditions

AAltitude above pad (m)>0

BAltitude above pad (m)>0

CAltitude above pad (m)>0

DAltitude above pad (m)>0

❌Did not trigger

Rule 6

After launch onlyANY condition (OR)Active during lockout

ACTION:OUTPUT #1

Conditions

AAltitude above pad (m)>0

BAltitude above pad (m)>0

CAltitude above pad (m)>0

DAltitude above pad (m)>0

❌Did not trigger

Motor match (BETA)

Very much in testing mode! We are working out how to guess which motor a flight flew on.

Brand

Motor

Score

Shape

Burn

AeroTech

J615ST

142

93.1%

97.7%

AeroTech

H195NBT

110

82.1%

96.8%

Cesaroni

G125-RL

104

84.5%

94.3%

AeroTech

I600R

104

82.8%

91%

AeroTech

J825R

104

84.7%

94.6%

Cesaroni

G118-BS

100

83.5%

95.8%

Cesaroni

H163-WT

100

81.6%

95.4%

Cesaroni

G83-BS

83.9%

94.2%

Cesaroni

H133-BS

85.8%

94.1%

Cesaroni

H255-BS

85.8%

91.2%

Flight comparison

Comparing against 3 other flights with the same motor configuration.

Highest apogee756.69 m 3rd of 4

The maximum altitude reached above the launch point.

you

best

best 756.82 m · Lil Nuke - Flight with 4 altimeters - 1 (#1784)

Best stability85.3 /100 4th of 4

How straight it flew: launch, coning and thrust straightness combined. 100 is perfect.

you

best

best 86.2 /100 · Lil Nuke - Flight with 4 altimeters - 4 (#1796)

Fastest velocity155.11 m/s 4th of 4

Peak ascent velocity recorded during the flight.

you

best

best 159.41 m/s · Lil Nuke - Flight with 4 altimeters - 4 (#1796)

Best avg burn G11.73 G 2nd of 4

Average acceleration during the motor burn, in G.

you

best

best 11.98 G · Lil Nuke - Flight with 4 altimeters - 1 (#1784)

Longest flight154.9 s 2nd of 4

Total recording time from launch to landing.

you

best

best 155 s · Lil Nuke - Flight with 4 altimeters - 1 (#1784)

Lowest spin340.71 dps 2nd of 4

Average spin rate during the burn.

you

best

best 324.26 dps · Lil Nuke - Flight with 4 altimeters - 1 (#1784)

Coldest flight26.38 C 3rd of 4

Board temperature at launch.

you

best

best 0.28 C · Lil Nuke - Flight with 4 altimeters - 3 (#1786)

🌲 Is it in a tree?41.04 m 3rd of 4

Just for fun: whichever flight came down closest to 8 m above the launch point (roughly tree height) is the one most likely stuck up a tree.

8 m

you

best

closest to 8 m · Lil Nuke - Flight with 4 altimeters - 4 (#1796) at -2.02 m

General flight settings

This is a snapshot of the settings that were used for this flight. pop over to the pop over to the My devices page and then Configure settings on the device..

Forecast pressure

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.

1013.2 mbar

Launch detect

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.

25 meters

Sample ratio

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.

Max samples

This is the maximum samples the altimeter will log per flight. When it reaches this amount it will stop and save the recording.

18000

Recording stop

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).

Auto: 450 samples stable (~9s)

Oversampling

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.

16x Oversampling

IIR filter

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.

COEFF 7

Pressure filter

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.

Kalman 2 (default)

Lockout change

This is how we detect a lockout. If the pressure changes by this much in a single sample downwards (pressure increase, lower altitude) then it's likely to be a false reading. Multiply the setting by 32 to get the speed in meters per second that it will trigger at.

0.5 meters

Sync sensors

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 (13 samples / 71.00ms)

Orientation

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.

Upwards (text up)

IMU filter

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

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.

1.4G

Launch lock

When enabled, the altimeter locks out recording for a set period after power on to prevent false triggering during setup.

DISABLED

Static temperature

A fixed temperature value used for altitude calculation when the external temperature sensor is disabled or not connected.

15.00 °C

Temp sensor

If an external MT1 temperature sensor is connected, this controls whether it is used for logging only or also for altitude calculations.

DISABLED

Output settings

This is a snapshot of the settings that were used for this flight.

Output 1 enabled

Disable or enable the output from being able to turn on or off.

DISABLED

Output 1 trigger

After apogee (altitude)

This method triggers when the altitude drops below the set altitude after apogee is detected.

After apogee (time)

This method triggers the defined seconds after apogee is detected.

After launch (altitude)

This method is activated if/once the altimeter exceeds the set altitude after launch.

After launch (time)

This option triggers the defined seconds after launch is detected.

After burnout (time)

This method triggers the defined seconds after burnout is detected.

After apogee (altitude)

Output 1 time on

This is how long the output should trigger ON state when the rules are met.

2000ms

Output 1 altitude

This is the altitude to trigger at if using a trigger method that works on altitude.

For example if you set this to 75m and After apogee (altitude) for the trigger then the output will turn on at 75m on descent above the launch altitude.

0 meters

Output 1 time

This is the time variable for output triggers that work on time.

For example if you set this to 3 seconds and After apogee (time) as the trigger then the output will turn on 3 seconds after apogee.

0 seconds

Altitude lock

Altitude lock is a safety feature that prevents the output from triggering if the altitude is below this level when the rules are met.

0.00 m

Tilt angle lock

This is another safety feature. It can be used to disable the output if the rocket has gone too far from vertical.

For example if you set the tilt angle lock to 40 degrees then the output will not fire if the rocket is more than 40 degrees from vertical. To disable set this to 0.

0.00 °

Sensor calibration

Calibration offsets used during this flight.

Gyroscope

-0.220°

-0.650°

1.430°

Accelerometer

11.170 mG

3.330 mG

27.110 mG

Device settings

This is a snapshot of the settings that were used for this flight.

Device TAG

A custom name or tag assigned to this device for easy identification.

TEST-LEFT-3

Language

The language setting configured on the device.

Shutdown mode

Controls what happens after recording. Standard shuts down normally, Delayed keeps WiFi on for 30 seconds after landing, Stay on keeps the device powered on.

Delayed 30s

LED brightness

The brightness level of the LED indicators on the Mercury. Lower values save battery.

20%

WiFi TX power

WiFi transmit power level. Higher gives better range but uses more battery.

2 dBm (low)

Sleep mode

Controls whether the device enters low-power sleep when idle.

Normal (sleep when idle)

Battery monitor

Monitors battery voltage during the flight.

DISABLED

Cloud group

The cloud group / category this flight is assigned to.

GP6 / GP7 ports

Configuration for the GP6 and GP7 general purpose output ports. These ports can drive pyro channels, servos, or other devices.

Channel 6 mode

ON = HIGH

Ch6 min pulse (µs)

Ch6 max pulse (µs)

Ch6 frequency

0 Hz

Ch6 angle ON

0.00°

Ch6 angle OFF

0.00°

Ch6 on time

0.00s

Channel 7 mode

ON = HIGH

Ch7 min pulse (µs)

Ch7 max pulse (µs)

Ch7 frequency

0 Hz

Ch7 angle ON

0.00°

Ch7 angle OFF

0.00°

Ch7 on time

0.00s

I2C PCA9685 Servo Board

This is a snapshot of the settings that were used for this flight.

Configuration for the external I2C PCA9685 servo expansion board. This board provides up to 6 additional servo channels.

No I2C servo board was connected for this flight.

Prediction and air brakes

This is a snapshot of the settings that were used for this flight.

The Mercury can predict apogee while coasting after burnout. These settings control the prediction calculation and optional air brake system.

Dry mass

The total mass of the rocket after motor burnout (dry mass). This is used for the ballistic prediction of apogee altitude. Enter the mass without the motor propellant, or the mass at burnout.

$tc_not_configured

Drag Cd

The aerodynamic drag coefficient (Cd) of the rocket. This is used with the rocket area to calculate aerodynamic drag during coast. A typical model rocket has a Cd of 0.4 to 0.8. You can find this value from OpenRocket or RockSim simulations.

$tc_not_configured

Reference area

The cross-sectional reference area of the rocket in square meters. This is typically the area of a circle with the body tube diameter. For example a 38mm tube has an area of approximately 0.00113 m².

$tc_not_configured

Gas constant

The specific gas constant for dry air, used in the atmospheric model for altitude and density calculations. The standard value is 287.05 J/(kg·K). You shouldn't need to change this unless you know what you're doing.

$tc_not_configured

The following settings configure the air brake system.

Air brake enabled

Enables or disables the active air braking system. When enabled, the Mercury will deploy air brakes via the configured servo channel to try and reach the target altitude. Firmware 2.1+ required.

OFF (default)

Servo channel

Which servo output channel the air brake mechanism is connected to. GP6 and GP7 are the two onboard servo headers, I2C channels are for an external servo expander board.

GP6

Deploy speed

The speed at which the air brakes deploy. The Mercury gradually increases the servo angle until the predicted apogee matches the target rather than going full on/off. This setting controls how quickly it ramps up to full braking.

Medium (default)

Target altitude

The target apogee altitude in meters. The air brake system will try to slow the rocket so it reaches this altitude.

$tc_not_configured

Over shoot %

The percentage over the target altitude to aim for until within 15% of the target. This helps prevent undershooting if the prediction is slightly off early in the coast. For example, with a 1000m target and 5% early adjustment, the Mercury will aim for 1050m until it passes 850m.

$tc_not_configured

Activation altitude

The air brake system activates after burnout, but won't engage until the rocket has reached this percentage of the target altitude. This prevents the brakes from deploying too early when predictions may be less accurate.

20% (default)

Flight
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