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Merit Badge Capstone Project
Patrol Box 2.0 — Systems Engineering of Troop Gear
Executive Summary
Scouts run the full systems-engineering loop on a real piece of patrol equipment — typically a chuck box, cook-kit caddy, or gear sled. They interview the patrol about pain points, write needs and requirements, trade two or three concepts, sketch and CAD the chosen design, build a working prototype, and verify it on a troop campout. The deliverable is the gear itself plus a one-page systems-engineering worksheet that doubles as the Engineering req 5 write-up and the Inventing req 5/6/7 prototype-and-notebook track.
Covers 11 requirement items across 4 badges.
Requirements This Project Checks Off
Requirement IDs link back to the corresponding badge page, where the full official text and checklist live. The counselor note under each badge explains how this project maps onto the badge's intent.
Engineering
End-to-end systems-engineering project on real hardware. Hits req 5 directly and lets the Scout pick two of req 6's hands-on options without contrivance.
- 1. Investigate a Manufactured Item Select a manufactured item in your home (such as a toy or an appliance) and, under adult supervision and with the approval of your counselor, investigate how and why it works as it does. Find out what sort of engineering activities were needed to create it.Counselor note: Investigate the existing patrol box / chuck box / cook kit and document how it was engineered.
- 4. Visit with an Engineer Visit with an engineer (who may be your counselor, parent or guardian) and do the following:Counselor note: Counselor visit doubles as req 4 — Scout walks the engineer through their own design.
- 5. Systems Engineering Design Use the systems engineering approach to design an original piece of patrol equipment, a toy or a useful device for the home, office or garage.Counselor note: Needs → requirements → concept → trade → design → verification on a real piece of patrol equipment.
- 6a. Hands-On Engineering — 6(a) Transforming Motion. Build a simple model that demonstrates motion using levers and inclined planes. Describe an example where this mechanism is used in a real product.Counselor note: If the design uses hinges, latches, drawers, or a deployable shelf, demonstrate the lever / inclined-plane mechanism.
- 6d. Hands-On Engineering — 6(d) Using Materials. Do experiments to show the differences in strength and heat conductivity in wood, metal, and plastic.Counselor note: Compare wood, aluminum, and plastic for the box body — strength, weight, and weatherability.
- 8. Engineer's Code of Ethics Study the Engineer's Code of Ethics. Explain how it is like the Scout Oath and Law.Counselor note: NSPE Code of Ethics discussion grounded in the design choices made (cost vs. safety vs. weight).
Inventing
Improving real camping gear is exactly Inventing req 5–7. The systems-engineering notebook IS the inventor's notebook.
- 5. Improve a Camping Product Choose a commercially available product that you have used on an overnight camping trip with your troop. Make recommendations for improving the product, and make a sketch that shows your recommendations. Discuss your recommendations with your counselor.Counselor note: Improve a commercially available camping product the Scout has actually used on a campout.
- 6. Invention Concept Think of an item you would like to invent that would solve a problem for your family, troop, chartered organization, community, or a special-interest group. Keep a notebook to record your progress.Counselor note: Need statement, sketches, clay/cardboard model, materials list — recorded in a dated notebook.
- 7. Working Prototype Build a working prototype of the item you invented for requirement 6. Test and evaluate the invention. Consider cost, usefulness, marketability, appearance, and function. Describe how your original vision compares to the prototype. Have your counselor evaluate and critique your prototype. (Counselor approval of the design is required before building.)Counselor note: Working prototype, tested on a campout, with cost / usefulness / appearance / function evaluation.
Programming
Optional uplift: a small parametric CAD script (OpenSCAD or Python+CadQuery) lets the Scout regenerate the box for different cooler sizes. Counts as one of Programming req 5's environments.
- 5a. Project — 5(a) In the first language and environment, write or modify a program, debug and demonstrate, and explain as above.Counselor note: Optional environment: OpenSCAD or Python parametric CAD — input box dimensions, output cut list / STL.
Artificial Intelligence
Optional: Scout uses an AI assistant to draft the parametric CAD script or the cut-list spreadsheet, with prompts logged.
- 6. Developing AI Skills Do the following and share what you learned with your counselor:Counselor note: Prompt engineering for CAD / spreadsheet generation. Counselor reviews accepted vs. rejected suggestions.
Project Details
Overview
Scout runs the full systems-engineering loop on a real patrol chuck box. Three concepts are on the table: a traditional plywood box (cheap, heavy), a 1010-S aluminum extrusion box (engineered, expensive), and a Flexpipe pipe-and-joint box (reconfigurable, middleweight). All three share the same rolling base + slide-in legs + fold-open cook lid, so only the frame material changes.
Off-the-shelf alternatives — what you're competing with
Before the Scout commits to building, they should know what's already on the market. The trade study should explicitly ask: is the DIY box better, cheaper, or more educational than buying one of these? In every case so far, the DIY route is cheaper than the comparable off-the-shelf option, but the off-the-shelf options are more polished — that contrast IS the engineering trade.
Build vs. buy — quick take
| Option | Cost | Wheels | Stand-up legs | Cook lid | Counts as merit-badge build? |
|---|---|---|---|---|---|
| Sidio Camp Kitchen Kit | $288 | no | no | no | no — purchased product |
| Adventure Wagon Aux Box | $316 | no | no | no | no |
| Trail Kitchens Chuck Box | $399+ | no | +$70 option | yes (work surface) | no |
| Camp Chef Sherpa | $220 | no | yes (built-in) | no (table only) | no |
| Concept A — Plywood DIY | $80–130 | add | add | add | yes |
| Concept B — 1010-S DIY | $586 | yes | yes | yes | yes |
| Concept C — Flexpipe DIY | $314 | yes | yes | yes | yes |
Concept snapshot
| Concept | Frame material | Cost (faithful BOM) | Empty frame weight | Tools required |
|---|---|---|---|---|
| A — Plywood | ¾" plywood or 1×6 pine | $80 – $130 | ~35 lb | Circular saw, drill, clamps, shop day |
| B — 1010-S extrusion | 80/20 aluminum 1"×1" | $585 – $610 | ~14 lb | 5 mm + 4 mm hex keys (no cuts) |
| C — Flexpipe | 80/20 28 mm steel pipe + clamps | $315 – $345 | ~22 lb | Pipe cutter + 5 mm hex key |
Box dimensions (all concepts)
| Parameter | Value |
|---|---|
| Outer W × D × H (body) | 30" × 18" × 20" |
| Caster height | 3.5" |
| Slide-in leg extension | 12" |
| Work-surface height, legs retracted (rolling) | ~23.5" |
| Work-surface height, legs deployed (cook) | ~35.5" |
| Lid opens to | 90° + prop arm (cook surface) |
| Target empty weight | ≤ 30 lb |
Six-phase build plan
| Phase | Deliverable |
|---|---|
| 1 — Interviews | Needs statement + 5–8 measurable requirements |
| 2 — Trade study | 3 concept sketches + weighted trade matrix |
| 3 — Design review | CAD or scaled mock-up, BOM, counselor signoff |
| 4 — Build (shop day) | Assembled prototype, photographs of every step |
| 5 — Verification campout | Req-by-req pass/fail, new pain points logged |
| 6 — Wrap-up | Notebook final entry + NSPE ethics discussion |
Concept A — Plywood BOM
| Qty | Part | Description | Vendor | Unit | Ext | Link |
|---|---|---|---|---|---|---|
| 1 sheet | Plywood ¾" 4×8 | Birch or BC-grade ¾" plywood | Home Depot | $45.00 | $45.00 | link |
| 1 set | Hinges + latch | Butt hinges, hasp latch, handles | Home Depot | $30.00 | $30.00 | link |
| 1 pk | #8 wood screws | 1¼" and 2" assortment, wood glue | Home Depot | $15.00 | $15.00 | link |
| 4 | 3" swivel caster | Locking and rigid, bolt-on plate | Harbor Freight | $6.00 | $24.00 | link |
| 4 | 12" pine leg | Cut from 2×2 pine, slide-in | Home Depot | $2.50 | $10.00 | link |
| Concept A total | $124.00 |
Concept B — 1010-S extrusion cut list
| Qty | Length | Role |
|---|---|---|
| 4 | 30" | Top/bottom long rails (front/back) |
| 4 | 18" | Top/bottom short rails (left/right) |
| 4 | 20" | Vertical corner posts |
| 2 | 30" | Interior shelf rails (long) |
| 2 | 18" | Interior shelf rails (short) |
| 4 | 12" | Slide-in leg extensions |
| 20 cuts | 380" total | $0.42/in × 380 + $3.00 × 20 cuts = $219.60 |
Concept B — 1010-S frame BOM
| Qty | Part # | Description | Vendor | Unit | Ext | Link |
|---|---|---|---|---|---|---|
| 380 in | 1010-S | 10 Series smooth 1"×1" T-slot extrusion + cuts | 80/20 Inc. | $0.42/in | $219.60 | link |
| 8 | #3395 | 10 Series anchor fastener assembly | 80/20 Inc. | $4.64 | $37.12 | link |
| 8 | #4265-Black | 10 Series 2-hole slotted inside corner bracket | 80/20 Inc. | $8.73 | $69.84 | link |
| 8 | #40-4332 | 10 Series 2-hole gusseted inside corner bracket | 80/20 Inc. | $7.48 | $59.84 | link |
| 32 | #3393 | ¼-20 × 0.500" button head screw assembly | 80/20 Inc. | $0.73 | $23.36 | link |
| 32 | #8901 | 10 Series standard slide-in T-nut | 80/20 Inc. | $0.59 | $18.88 | link |
| 4 | #3183 | 10 Series single-tab end fastener clip | 80/20 Inc. | $1.35 | $5.40 | link |
| Frame subtotal | $434.04 |
Concept B — door, lid, wheels, slide-in legs BOM
| Qty | Part # | Description | Vendor | Unit | Ext | Link |
|---|---|---|---|---|---|---|
| 1 | #4486 | 10 & 15 Series deadbolt latch (front door) | 80/20 Inc. | $10.76 | $10.76 | link |
| 2 | #2062 | 10 Series plastic door handle | 80/20 Inc. | $6.99 | $13.98 | link |
| 2 | #2061 | 10 Series piano / lid hinge | 80/20 Inc. | $9.48 | $18.96 | link |
| 1 | Prop arm | Steel cabinet lid stay, locks at 90° | Rockler | $9.00 | $9.00 | link |
| 1 sheet | Coroplast 4 mm | Black corrugated twinwall, walls + shelves | Home Depot | $29.90 | $29.90 | link |
| 1 | Durock 14×9×¼ | Fiber-cement stove pad, inside of lid | Home Depot | $8.00 | $8.00 | link |
| 4 | 3" caster | Swivel, 2 locking, bolt-on plate mount | Harbor Freight | $6.00 | $24.00 | link |
| 4 | Leg socket | 10-series end-cap + sleeve socket | 80/20 Inc. | $3.00 | $12.00 | link |
| 4 | R-clip | Detent pin for slide-in legs | McMaster-Carr | $1.50 | $6.00 | link |
| 1 lot | Misc | Black washers, panel screws, edge trim | local | $20.00 | $20.00 | |
| Door + lid + wheels + legs subtotal | $152.60 |
Concept B — grand total
Frame $434.04 + door/lid/wheels/legs $152.60 = $586.64 faithful. Substituting generic Coroplast and cutting half the branded brackets drops this to ~$400–450.
Concept C — Flexpipe cut list
| Qty | Length | Role |
|---|---|---|
| 4 | 20" | Vertical corner posts |
| 4 | 30" | Long rails (top + bottom, front + back) |
| 4 | 18" | Short rails (left + right, top + bottom) |
| 2 | 30" | Interior shelf rails (long) |
| 2 | 18" | Interior shelf rails (short) |
| 4 | 12" | Slide-in leg extensions |
| 20 cuts | 360" total | Buy 4 × 8 ft pipes ($12.36 ea) = $49.44, ~24" scrap |
Concept C — Flexpipe frame BOM
| Qty | Part # | Description | Vendor | Unit | Ext | Link |
|---|---|---|---|---|---|---|
| 4 | EP-96-LGR | 28 mm PE-coated steel pipe, 8 ft, light gray | 80/20 Inc. | $12.36 | $49.44 | link |
| 8 | HJ-8 | 3-way metal corner joint (top & bottom corners) | 80/20 Inc. | $5.50 | $44.00 | link |
| 4 | HJ-1 | Flat 90° cross joint (shelf intersections) | 80/20 Inc. | $4.25 | $17.00 | link |
| 4 | HJ-7 | Tee joint (slide-in leg sockets at corner posts) | 80/20 Inc. | $4.50 | $18.00 | link |
| 4 | HJ-5 | Sliding flat-clamp (panel edge retainer) | 80/20 Inc. | $2.74 | $10.96 | link |
| 8 | AP-ICAP | Pipe end cap (exposed pipe ends) | 80/20 Inc. | $0.18 | $1.44 | link |
| 1 lot | M8 hardware | Spare bolts/washers for the joints | 80/20 Inc. | $8.00 | $8.00 | link |
| Frame subtotal | $148.84 |
Concept C — door, lid, wheels, slide-in legs BOM
| Qty | Part # | Description | Vendor | Unit | Ext | Link |
|---|---|---|---|---|---|---|
| 4 | W-4PF | 3" swivel caster, flange-mount to pipe end | 80/20 Inc. | $15.95 | $63.80 | link |
| 4 | Leg sleeve | Pipe-to-pipe reducer clamp for 12" leg | 80/20 Inc. | $3.50 | $14.00 | link |
| 4 | R-clip | Detent pin for slide-in legs | McMaster-Carr | $1.50 | $6.00 | link |
| 2 | Hinge clamp | Piano-style hinge, pipe-mounted cook lid | Creform | $6.00 | $12.00 | link |
| 1 | Prop arm | Cabinet lid stay, locks at 90° | Rockler | $9.00 | $9.00 | link |
| 1 sheet | Coroplast 4 mm | Black corrugated twinwall, walls + shelves | Home Depot | $29.90 | $29.90 | link |
| 1 | Durock 14×9×¼ | Fiber-cement stove pad, inside of lid | Home Depot | $8.00 | $8.00 | link |
| 1 | Latch + handles | Generic deadbolt latch + 2 plastic handles | Home Depot | $12.00 | $12.00 | link |
| 1 lot | Misc | Panel screws, edge trim, zip ties | local | $10.00 | $10.00 | |
| Door + lid + wheels + legs subtotal | $164.70 |
Concept C — grand total
Frame $148.84 + door/lid/wheels/legs $164.70 = $313.54 faithful. About $275 cheaper than Concept B but ~8 lb heavier and less stiff.
Concept B vs. Concept C — trade study
| Criterion | Concept B (1010-S) | Concept C (Flexpipe) | Winner |
|---|---|---|---|
| Cost | $586 | $314 | C |
| Empty weight | ~14 lb | ~22 lb | B |
| Lateral rigidity | High (gusseted) | Medium (clamps) | B |
| Assembly time | ~4 hrs | ~2.5 hrs | C |
| Tools needed | Hex keys only (no cuts) | Pipe cutter + hex key | B |
| Reconfigurable mid-project | Hard (T-nut access) | Easy (loosen clamp) | C |
| Field repair | Order custom extrusion | Cut & clamp on site | C |
| Engineering capstone value | Excellent | Excellent | tie |
Sources
| Resource | Link |
|---|---|
| 80/20 1010-S profile and pricing | link |
| 80/20 internal fasteners catalog | link |
| 80/20 latches and door components | link |
| 80/20 Flexpipe pipe & joint system | link |
| Creform metal joint catalog (Flexpipe equivalent) | link |
| Coroplast 4 mm black corrugated twinwall | link |
| Chuck-box reference design (plywood) | link |
Starting Ideas — Interactive Brainstorm
Brainstorm: what's your patrol's biggest gear pain?
Drag dots to score each idea on impact (vertical) and effort (horizontal). The Quick Wins quadrant is the sweet spot for a 6-week capstone.
Drag any dot to reposition it. Click an empty area to drop a new idea, then type a label and press Enter. Your edits stay in this browser only — refresh to start over.
3D Reference Model
Patrol Box 2.0 — 3D Model
Drag to rotate. Scroll or pinch to zoom. Toggle the options below to open the lid, drop the slide-in legs for cook-table height, peel off panels, or explode the frame.
Silver bars = 80/20 1010-S extrusion (1″×1″). Black panels = 4 mm corrugated plastic (Coroplast). Red discs = 3″ swivel casters. Dark gray rods = removable slide-in extension legs (shown when toggled).
Schedule & Time Commitment
Total time: about 12 hours of counselor time.
Six 90-minute sessions across six weeks plus one shop day (3 hours) and a verification campout. Pairs cleanly with a fall or spring patrol campout — schedule the build to land 1–2 weeks before that trip so the verification test is already on the calendar.
| Session | Hours | Focus |
|---|---|---|
| Session 1 (week 1) | 1.5 | Patrol interview, pain-point list, write the needs statement and 5–8 requirements. |
| Session 2 (week 2) | 1.5 | Two or three concept sketches, simple weighted trade study, pick a winner. |
| Session 3 (week 3) | 1.5 | CAD or scaled cardboard model. Materials list and cost estimate. |
| Session 4 (week 4) | 1.5 | Counselor design review (req 4 + Inventing req 7 approval). Update notebook. |
| Shop day (weekend) | 3 | Build the prototype with adult shop supervision. Photograph each step for the notebook. |
| Session 5 (week 5) | 1.5 | Bench test in the meeting room — load it, deploy it, time it. Fix the easy stuff. |
| Verification campout | 0 | Use the box on a real campout. Record what worked and what didn't (no counselor hours — Scout-led). |
| Session 6 (wrap-up) | 1.5 | Post-campout review, ethics + Code-of-Ethics discussion, write-up, sign-off. |
Interested in running this capstone with a Scout? Get in touch or go back to the Merit Badge Counselor page.