Work top to bottom. Don't skip the experiment-design step — a flight with no
control group produces a flight, not science.
Design the experiment first
Before any glue, decide what biological question this flight answers. This determines your payload,
your sensors, and what OSDR will eventually accept.
- Hypothesis: e.g. "High-G launch + brief altitude exposure reduces germination rate in Arabidopsis vs. ground control." your hypothesis
- Organism: choose a fast, well-characterized species (Arabidopsis, radish, lettuce) so results are comparable.
- Controls: an identical ground-control payload that never flies is mandatory.
- Variables you can log: peak acceleration (G), max altitude, temperature, flight duration.
Tip: read the
OSDR Training page
now — designing to the
standard is far easier than retrofitting your data later.
Gather materials & tools
Source your kit before building. Quantities below are a starting checklist — adjust to your design.
| Item | Purpose |
|---|
| Body tube + coupler set | Airframe sections (motor, payload, recovery) |
| Nose cone | Aerodynamic tip; sometimes houses electronics |
| Fin stock + centering rings | Stability & motor mounting |
| Motor & igniter (class per cert) | Propulsion — match to mass & altitude target |
| Parachute + shock cord | Recovery |
| Flight computer / altimeter | Altitude, acceleration, deployment |
| Payload capsule + seeds/seedlings | The living experiment |
| Epoxy, sandpaper, hobby knife | Assembly |
Sizing matters: the live payload + sensors add mass. Run your
numbers in a simulator (OpenRocket / RockSim) so the motor and recovery are sized for the loaded rocket,
not an empty one.
Simulate & finalize the design
Model the loaded rocket in OpenRocket
(free) before cutting anything.
- Confirm stability margin of ~1–2 calibers with the payload installed.
- Check predicted apogee, max velocity, and peak acceleration — that G figure is a key
biological variable, so know it before you fly.
- Verify recovery descent rate is gentle enough that the payload survives landing.
Build the airframe
Assemble the structure. Take your time on alignment — a crooked fin is a failed flight.
- Mount the motor tube with centering rings; cure fully.
- Attach fins square and symmetric (a fin-alignment jig helps); fillet with epoxy.
- Install the recovery harness anchor and prep the nose-cone/coupler joints.
Build the botanical payload bay
This is the heart of a MadWest rocket. The capsule must protect the organism and record its
environment.
- Containment: secure seeds in a medium (agar plate, moist substrate, or sealed
seed-pack) that won't shift under launch loads.
- Cushioning: foam or a sprung mount to dampen vibration and landing shock.
- Sensors: log acceleration, temperature, and pressure for the whole flight — these
become your environmental metadata.
- Sealing & sterility: keep the bay clean so post-flight contamination doesn't
confound your biology results.
Keep a twin. Build the ground-control payload identically and prepare it
on the same timeline — same seeds, same medium, same handling, minus the flight.
Integrate electronics & recovery
Wire and test the avionics on the bench before they ever go in the rocket.
- Confirm the altimeter arms, logs, and triggers deployment in a ground test.
- Pack the parachute; verify the deployment charge or mechanism (dual-deploy if your altitude needs it).
- Label and time-sync every data logger so flight data and biology samples can be matched later.
Pre-flight checks & launch
At a sanctioned range, under mentor supervision, run the checklist.
- Final mass & stability check with the live payload installed.
- Load seeds/seedlings as late as possible; record the exact load time.
- Arm avionics, get range-safety sign-off, and launch.
- Note launch time, conditions, and motor used — all of it is metadata.
Recover, measure & preserve
The flight is the easy part — the science happens now.
- Recover quickly; record landing time and any damage.
- Download flight logs (altitude, G, temperature) immediately.
- Begin your biology assay on flown and control samples together: germination counts, growth
measurements over days, optional gene-expression sampling.
- Photograph and log everything with consistent units and timestamps.
Package & submit to OSDR
Turn the raw results into an openly shareable dataset.
- Organize flight metadata + biology results to the OSDR structure.
- Follow the OSDR Training checklist, then the
Data Submission workflow.
- Document your methods so another club could repeat your flight.
That final submission is what makes this more than a hobby launch — your flight becomes
reusable science.