| R1 | BT-60 body tube 18" (41.6 mm OD, 40.5 mm ID) Apogee 10141 · 6 per pack, 18 g each · 1 tube = booster, ~150 mm of a 2nd = payload bay (pack covers ~3–4 rockets) | 1 | $17.78 | $17.78 | apogeerockets.com Apogee Components $17.78 (6-pack) · checked 2026-10-05 · In stock (10+) | Estes BT-60 3-pack $11.29 (verified: https://estesrockets.com/products/bt-60-body-tube). Low total uses this. Apogee 10148 slotted BT-60 2-pack $10.80 (verified on same Apogee page) — check slot length vs fin root before using | — |
| R2 | BT-60 coupler (payload-bay joint) Apogee 13019 AC-41.6 · 3/pk, 76 mm long, ID 39.4 mm, OD 40.4 mm | 1 | $4.85 | $4.85 | apogeerockets.com Apogee Components $4.85 (3-pack) · checked 2026-10-05 · In stock (10+) | Cut 76 mm of BT-60 coupler from another brand; measure ID before cutting bulkheads | — |
| R3 | Nose cone, plastic 3:1 ogive, BT-60 Apogee 20069 PNC-41.6 · 124 mm exposed, 43.2 mm shoulder (Apogee specs; the same page also lists 1.45 in / 36.8 mm — measure), shoulder OD 40.2 mm, 21.6 g (cone), includes a BT-60→BT-55 transition you can discard · blow-moulded and hollow, but the shoulder's aft end is closed (moulded loop) as supplied: cut it off at Apogee's moulded cut line (build guide step 11) | 1 | $13.15 | $13.15 | apogeerockets.com Apogee Components $13.15 · checked 2026-10-05 · In stock (10+) | Any BT-60 nose cone; re-measure length and mass for the CP/CG calculation | — |
| R4 | Motor mount kit 24 mm / BT-60 Apogee 12009 · 24 mm motor tube, cardstock centering rings, engine block; hook NOT included | 1 | $6.93 | $6.93 | apogeerockets.com Apogee Components $6.93 · checked 2026-10-05 · In stock (10+) | Laser-cut the birch centering rings in cutfiles/ (measure your motor tube OD first) + any 24 mm motor tube | — |
| R5 | Engine hook, standard 2.75" (24 mm D motors) Apogee 24048 · 6/pk, spring steel, 69.9 mm | 1 | $6.45 | $6.45 | apogeerockets.com Apogee Components $6.45 (6-pack) — read via curl; WebFetch timed out · checked 2026-10-05 · In stock (10+) | Screw-on 24 mm motor retainer (unverified) | — |
| R6 | Launch lug 1/4" (matches 1/4" rod) Apogee 13057 · 6/pk, 76 mm, ID 7.3 mm | 1 | $3.91 | $3.91 | apogeerockets.com Apogee Components $3.91 (6-pack) · checked 2026-10-05 · In stock (10+) | 3/16" lug only if you also use a 3/16" rod | — |
| R7 | Parachute 18" rip-stop nylon Estes Rip Stop Parachute, 18" option · model descent ≈5.1 m/s at ~199 g burnout mass (Cd ≈0.75 assumed); ≈36.5 s from 187 m; the pack drift rule uses wind × 40 s (covers 208 g builds and a flatter chute) · shroud lines tied or larks-headed to a ball-bearing snap swivel (R7b) clipped through a figure-eight loop in the elastic ≈15 cm from the eyebolt (build guide step 7) | 1 | $9.99 | $9.99 | estesrockets.com Estes $9.99 (18" option in the product JSON; 15" is $6.75 — don't substitute it: ≈6.2 m/s descent) · checked 2026-10-05 · Listed | Apogee 29092 18" printed nylon $7.86 (verified, OUT OF STOCK on check date) | — |
| R7b | Ball-bearing snap swivel (parachute attachment) Eagle Claw 01092-003 · ball-bearing swivel with coastlock snap, size 3, 3-pack (one pack covers 3 rockets) · 35 lb test (Eagle Claw product page, size 3 / 01092-003, checked 2026-10-07); the payload-section snatch is ≈11–28 N (≈2.5–6.3 lbf) · clip the snap through the elastic's figure-eight loop and tie or larks-head the shroud lines to the swivel's ring (build guide step 7) · mass not published: weigh it | 1 | $3.49 | $3.49 | eagleclaw.com Eagle Claw $3.49 (size 3 option, manufacturer page) · checked 2026-10-07 · Listed | Apogee 14509 100-lb ball-bearing swivel $4.84 (1.29 g, welded rings, in stock; verified 2026-10-07: https://www.apogeerockets.com/Building-Supplies/Recovery-Equipment/Swivels/100-lb-Ball-Bearing-Swivel) joined to the loop with an Apogee 29620 1/8" quick link $5.08 (8.5 g, 220 lb, in stock; verified 2026-10-07), or a 1/8" quick link alone | — |
| R8 | Kevlar shock-cord leader 300 lb Apogee 30326 · $0.94/ft, 10 ft minimum; use ~2 ft anchored to motor mount | 10 | $0.94 | $9.40 | apogeerockets.com Apogee Components $0.94/ft (min 10) · checked 2026-10-05 · Listed | Apogee 30325 Kevlar 100 lb $0.80/ft is rated by Apogee for A–C rockets only — not recommended here | — |
| R9 | Elastic shock cord 1/8" Apogee 30328 · $0.66/ft, 10 ft min; ~5 ft per rocket | 10 | $0.66 | $6.60 | apogeerockets.com Apogee Components $0.66/ft (min 10) · checked 2026-10-05 · Listed | Estes shock cord & mount pack (seen as SOLD OUT on Estes page) | — |
| R10 | Recovery wadding Estes · ~72 sheets (~18–25 launches per Estes) | 1 | $5.99 | $5.99 | estesrockets.com Estes $5.99 · checked 2026-10-05 · Listed | Reusable Nomex chute protector (unverified) | Only flame-resistant wadding (NAR code) |
| R11 | Birch plywood 3 mm (1/8") 12×24" Midwest Products 5244 aircraft birch · one sheet ≈ parts for several rockets | 1 | $24.01 | $24.01 | hobbylinc.com Hobbylinc $24.01 ("Email When Available" = not in stock on check date) · checked 2026-10-05 · Not available on check date | Any laser-grade 3 mm birch ply from a makerspace or craft store; cardboard is NOT acceptable for fins | Laser cutting: trained adult operator, never unattended |
| R12 | Wood glue (aliphatic, e.g. Titebond II) 8 oz For fins, rings, bulkheads, lug; CA or epoxy optional | 1 | $6.00 estimate | $6.00 | Home Depot / Lowe's / hardware store (no link) checked 2026-10-05 | Any yellow wood glue | — |
| R13 | Closed eyebolt + 2 flat washers (12 mm OD) + nyloc nut (shock-cord anchor) M4 (or #8-32) forged or welded CLOSED eyebolt, ~20–25 mm shank, through the 6 mm laminated bulkhead; washer each face: M4 DIN 9021 (12 mm OD) or #8 SAE flat — NOT a ¾–1 in fender washer, which would overlap A2's sled slot; nyloc on the forward face; epoxy seal. NOT a wood-screw eye | 1 | $3.00 estimate | $3.00 | Hardware store (no link) checked 2026-10-05 | Commercial BT-60 coupler bulkhead with an installed eyebolt (unverified; Apogee page timed out) | — |
| R14 | Ballast for Iteration 1 (≈25 g) Modeling clay or epoxy putty, secured to forward sled bulkhead | 1 | $2.00 estimate | $2.00 | Any (no link) checked 2026-10-05 | Clay or epoxy putty only (keeps the FAA 101.22(a) "no substantial metal parts" criterion obviously met) | — |
| R15 | Motors — Estes D12-5 (2-pack, incl. 2 starters + 4 plugs) NAR-certified 24×70 mm black powder; Estes: 20.00 N·s (label), max liftoff 283 g. thrustcurve.org/NAR cert data: 16.84 N·s, 10.21 N avg, 1.65 s burn | 2 | $15.99 | $31.98 | estesrockets.com Estes $15.99 (2-pack) · checked 2026-10-05 · Listed (physical address required) | Estes D12-3 2-pack $15.99 (verified: https://estesrockets.com/products/d12-3-engines) — only if your liftoff mass is above the D12-5's 283 g limit and your sim's coast time is closer to 3 s (Estes D12-3 upper mass limit not verified) | Adult (18+) buys, stores (cool, dry, away from ignition sources) and installs. No federal minimum age for ≤ D motors (CPSC exempt, 16 CFR 1500.85(a)(8), per the NAR Laws and Regulations page); check your state (e.g., CA: 14+ for ≤ D, 12+ in an adult-run education program; CSFM-approved motors only — verify the current 19 CCR §1027 text) and your district. Never modify. 4 motors = baseline + 2 iterations + 1 spare |
| R16 | Nose-retention screws, #2 × 1/4" pan head (2 per flight set) Through the payload tube into the plastic nose shoulder (1.5 mm pilot holes); removable for access. Required for EVERY flight (tech review F1) | 1 | $1.50 estimate | $1.50 | Hardware store (no link) checked 2026-10-05 | Nylon push rivets of similar size, or masking tape around the joint + a ≥10 N tug test | — |
| Subtotal | $157.03 | Low-cost path: $145.54 |