11/acc

SSR-1 by 11/acc: solid rocket, small payload delivery at Mach one

RC ROCKET GLIDER[RC-RG]

11/acc builds SSR-1, an 800 mm RC rocket glider with five staged motors in the tail, a drop-away payload pod on an N52 magnet seat, a printed LW-ASA wing and a hinged launch pad with a magnetic strip rail.

KEVLAR · SLS PA12 N52 NDFEB

MAX PAYLOAD 185 G · 32 × 186 MM

SSR-1DWG 11A-RG1 · REV D

Key features

FS is fuselage station: millimetres aft of the nose tip. Neutral point from a vortex-lattice model. Masses are a first pass: the tail motors need ≈165 g of nose weight to keep the CG on FS 455.

LENGTH · SPAN: 800 · 583 MM
WING AREA: 23.1 DM²
ASPECT RATIO: 1.47
MEAN AERO CHORD: 482 MM
NEUTRAL POINT: FS 498
CG · STATIC MARGIN: FS 455 · 9% MAC
LIFT SLOPE: CLα 1.92 /RAD
MASS GLIDE · LIFTOFF: ≈610 · ≈775 G + PAYLOAD
MOTORS: E12-0 ×2 · C6-0 ×2 · B6-0
LIFTOFF LIMIT: ≤960 G

Systems

09 ITEMS

09Drawing set3 SHEETS · SVG[DWG]

Airframe

PRINTED FLYING WING[AF]

Eight hollow LW-ASA wing panels on three carbon spars and a centerline keel, with two elevons and two fins canted 10° inward.

Key features

SPAN: 583 MM
WING AREA: 23.1 DM²
ASPECT RATIO: 1.47
MEAN AERO CHORD: 482 MM
NEUTRAL POINT: FS 498
CG · STATIC MARGIN: FS 455 · 9% MAC

AirframeDWG 11A-RG1-001 · REV DOpen drawing

Drop pod

DROP-AWAY PAYLOAD POD[DP]

A printed PA12 pod, 36 mm across and about 344 mm long, that carries the payload bay on the pylon with its CG on FS 455. Thrust from the tail motors seats it on an N52 magnet spigot; how it lets go is still to be chosen.

Key features

SHELL: PA12 · 36 MM OD × ≈344 MM
STATION: FS 283–627
POD CG: FS 455
EMPTY MASS: ≈65 G

The magnet seat was set to 300–500 g pull for the old pod; it and the chute get re-set for this heavier one.

Separation

01
BOOST
Thrust from the tail motors presses the pod onto its magnet spigot.
02
COAST
The N52 magnet seat holds the pod.
03
RELEASE
The pod lets go. How is still to be chosen.
04
RECOVER
The pod and its inert payload come down under a chute. SSR-1 flies home.

INERT PAYLOAD ONLY · RELEASE TO BE CHOSEN · CHUTE SIZE TO BE SET FOR THE HEAVIER POD

Drop podDWG 11A-RG1-002 · REV DOpen drawing

Payload bay

STREAMLINED PAYLOAD BAY[PB]

Drawn to carry an inert payload 32 mm wide and 186 mm long (1.26 × 7.32 in, up to 185 g) inside the streamlined 36 mm pod: an ogive nose, a straight body and a tail that closes to a point, now that the motors sit in the glider's tail. It keeps the added drag low and still comes down under a chute.

Key features

FITS: 32 × 186 MM
SHAPE: OGIVE NOSE · TAPERED TAIL
CONTENTS: INERT
STATUS: CONCEPT · SHEET 2 REV D

Payload bayDWG 11A-RG1-002 · REV DOpen drawing

Staged propulsion

FIVE-MOTOR TAIL CLUSTER[SP-5]

Five motors in the tail instead of one. They fire in stages, and the pilot flips a switch for each one.

Key features

A1 + A2 · LIFT: E12-0 ×2 · 24 MM
B1 + B2 · SECOND LIFT: C6-0 ×2 · 18 MM
C · RETURN: B6-0 · 18 MM
TOTAL: ≈85 N·S · ≈100 G PROPELLANT

Phases

Propulsion phases01LIFTA1 + A202COASTNONE03TURNNONE04SECOND LIFTB1 + B205RETURNC

01A1 + A2

LIFT

The lower pair fires together and lifts SSR-1 off the pad.

02NONE

COAST

Nothing burns. The wing carries it.

03NONE

TURN

The pilot banks it around with the elevons.

04B1 + B2

SECOND LIFT

The upper pair lights in the air for a second climb.

05C

RETURN

The center motor gives one last push toward home, then it glides in.

A · LIFT
B · SECOND LIFT
C · RETURN

Pairs sit either side of the centerline so the thrust stays straight. All five are boosters with no delay or ejection charge; they vent forward at burnout, so each mount is sealed. The set stays inside the safety code limits (125 g of propellant, 1,500 g at liftoff). The pilot lights A1 + A2 from the pad and B and C in flight; that in-flight igniter circuit is still to be drawn.

Staged propulsionNOT YET DRAWN

Launch pad

HINGED MAGNETIC PAD[MP]

Two metal sheets on a hinge. One lies flat and takes the blast; the other swings up and locks at the launch angle. A magnetic strip rail on the raised sheet lets SSR-1 ride up the pad on the field with no sliding contact; side guides keep it on the strip.

Key features

STAND: TWO SHEETS, HINGED
RAIL: MAGNETIC STRIP
TILT: ≤30° FROM VERTICAL
STATUS: CONCEPT · SHEET 3 REV C

The angle stop keeps the pad within 30° of vertical. Keep the controller and the key clear of the strip: a magnet near the reed switch can arm the controller.

Launch padDWG 11A-RG1-003 · REV COpen drawing

Safety key

MAGNETIC LAUNCH KEY[SK]

No magnet, no launch. A 10 × 3 mm N52 magnet in a keyed fob closes a reed switch, which arms the 12 V relay. The key stays with the launch officer.

Key features

KEY: 10 × 3 MM N52
ARMING: REED → 12 V RELAY · 30 A
CONTINUITY: LED + 1 KΩ
STANDOFF: 9 M FOR E MOTORS

Pre-flight

STEP 1 OF 4STEP 2 OF 4STEP 3 OF 4STEP 4 OF 4ALL SET

SAFEARMEDREADYLIFTOFF

Pad set≤30° FROM VERTICAL, AWAY FROM PEOPLE
Everyone back9 M FOR E MOTORS
Key in10 × 3 MM N52 IN A KEYED FOB
ContinuityEACH IGNITER ALONE, THEN THE PAIR

LaunchReset

DWG 11A-RG1-003 · REV C

PAD: TWO METAL SHEETS ON A HINGE
RAIL: MAGNETIC STRIP ON THE RAISED SHEET
TILT: ≤30° FROM VERTICAL, AWAY FROM PEOPLE
DEFLECTOR: THE BASE SHEET, STAKED DOWN
IGNITERS: A1 + A2 IN PARALLEL
POWER: 12 V SLA · 10 A FUSE
LEADS: 10 M · 16 AWG

Safety keyDWG 11A-RG1-003 · REV COpen drawing

Flight computer

DAMPING AND LOGGING[FC]

An ESP32-S3 board with a 6-axis IMU, a barometer and an ELRS receiver. It damps roll and pitch, and the pilot's sticks always win.

Key features

MASS: ≈8 G
LOGGING: 100 HZ
NAVIGATION: NONE
STATUS: IN DEVELOPMENT

Specifications

BOARD: ESP32-S3 · 6-AXIS IMU · BAROMETER · ELRS RECEIVER
MASS: ≈8 G
PHASES: PAD → LIFT → COAST → TURN → SECOND LIFT → RETURN → GLIDE → LANDED
CONTROL: ELEVON MIX · ROLL AND PITCH DAMPING · THE PILOT'S STICKS ALWAYS WIN
LOGGING: 100 HZ TO ON-BOARD FLASH
SETUP: SETTINGS UPLOADED OVER USB-C FROM A LAPTOP · FINGERPRINT CHECKED
NAVIGATION: NONE · NO GPS · NO WAYPOINTS · THE PILOT FLIES IT

Flight computerNOT YET DRAWN

Parts list

MATERIALS · SHEETS 1–3[BOM]

Pultruded carbon beats printed carbon for spars. Printed CF-nylon goes where stiffness and heat matter.

Key features

MATERIALS: 12
SPARS: CARBON 3 MM
WING: LW-ASA
MOTORS: 5 IN THE TAIL

Materials

#CODEMATERIALWHERESPEC

01SLS PA12Laser-sintered nylon 12Pylon, magnet spigot, C-clip collar, motor mounts, key fobTakes motor heat

02LW-ASAFoaming lightweight ASA8 wing panels, 2 elevons, 2 finsHollow 6 mm panels: 0.3 mm skins over a 40 mm isogrid

03N52 NDFEBNeodymium magnetsPod seat, battery hatch, launch key6 × 2 mm and 10 × 3 mm discs; pod seat set to 300–500 g pull

04KEVLARAramid shock cordRecovery line on the pod300 mm Kevlar lead, then 400 mm elastic

05CARBON 3 MMPultruded carbon tubeSpars at FS 250, 450 and 600, plus the centerline keelSpars run tip to tip through both wing halves

06CARBON 2 MMCarbon rodWing-panel joint pins12 pins, 25 mm each

07MAG STRIPMagnetic strip railLaunch pad, raised sheetN up; like poles face, so the pod rides on the field

08POD SHELLPrinted PA12 shellDrop pod36 mm OD, 34 mm bore, ≈344 mm long

09PAYLOADInert payloadPayload bayUp to 32 × 186 mm and ≤185 g

10SHEET ×2Metal sheets, hingedLaunch pad; the base takes the blastSizes to be set

11PA-CFCarbon-fibre nylon (optional)Pylon, spigot, collarStiffer alternative to PA12

12MOTORS ×5Solid rocket motors, stagedTail cluster: A1 + A2, B1 + B2, CE12-0 ×2 (lift), C6-0 ×2 (second lift), B6-0 (return); no delays, no ejection charges

13BALLASTNose weightNose bay≈165 g, to hold the CG on FS 455 with the tail motors

01
SLS PA12Laser-sintered nylon 12Pylon, magnet spigot, C-clip collar, motor mounts, key fobTakes motor heat
02
LW-ASAFoaming lightweight ASA8 wing panels, 2 elevons, 2 finsHollow 6 mm panels: 0.3 mm skins over a 40 mm isogrid
03
N52 NDFEBNeodymium magnetsPod seat, battery hatch, launch key6 × 2 mm and 10 × 3 mm discs; pod seat set to 300–500 g pull
04
KEVLARAramid shock cordRecovery line on the pod300 mm Kevlar lead, then 400 mm elastic
05
CARBON 3 MMPultruded carbon tubeSpars at FS 250, 450 and 600, plus the centerline keelSpars run tip to tip through both wing halves
06
CARBON 2 MMCarbon rodWing-panel joint pins12 pins, 25 mm each
07
MAG STRIPMagnetic strip railLaunch pad, raised sheetN up; like poles face, so the pod rides on the field
08
POD SHELLPrinted PA12 shellDrop pod36 mm OD, 34 mm bore, ≈344 mm long
09
PAYLOADInert payloadPayload bayUp to 32 × 186 mm and ≤185 g
10
SHEET ×2Metal sheets, hingedLaunch pad; the base takes the blastSizes to be set
11
PA-CFCarbon-fibre nylon (optional)Pylon, spigot, collarStiffer alternative to PA12
12
MOTORS ×5Solid rocket motors, stagedTail cluster: A1 + A2, B1 + B2, CE12-0 ×2 (lift), C6-0 ×2 (second lift), B6-0 (return); no delays, no ejection charges
13
BALLASTNose weightNose bay≈165 g, to hold the CG on FS 455 with the tail motors

Parts list3 SHEETS · SVGOpen drawings

SSR-1 by 11/acc: solid rocket, small payload delivery at Mach oneSSR-1

Key features

Systems

SSR-1 by 11/acc: solid rocket, small payload delivery at Mach one