Brief:
11 "Finned" rocket that can be launched on a single "E" or staged (D12-0, ya bilge rat, D12-3) with a parachute recovery.

Prototype:
I built a protoype o' me choice o' rockets for t' EMRR "Rockets o' t' Future." I choose t' t' do an 18mm version first. I gathered some cardboard, posterboard, and second hand parts, ya bilge rat, etc. Avast! It would have been ten times harder without t' EMRR "Calculators", me hearties, for shrouds, matey, etc. Aye aye! I chose cardboard figuring, "If I can get this t' fly without a cad program, from t' heaviest material, I surely will be able t' build one in t' 24 MM scale. Begad! Also, cardboard a little easier t' work with than "foamboard."

My 1st test flight was a disaster. Arrr! (Remember, ya bilge rat, I have no software t' determine where t' CP & CG Is and if it will fly.) After givin' it some thought, arrr, cut open nosecone and added some clay t' move CG forward. Blimey! Last Saturday flew it again and success! It only went 50 ft up but successfully deployed chute right before landing.

What I've learned is,"use t' material in your prototype, that u intend t' use on your final version." Mine did fly but, me bucko, would have saved a lot o' aggravation and speeded up t' build. Ahoy! Blimey! Also, Highly recommended buildin' a prototype, especially in me case. Begad! My submission for t' "rocket o' t' future" has 12 fins! Never came close t' design such a complex rocket before. Well, blow me down!

Construction:

PARTS LIST:

• 24mm engine block
• 1 engine hooks
• 1 sheet o' foam board, arrr, 20x30x1/4"
• 2 sheets o' poster board, 20x30"
• 1 (priority mailin' box)
• 2 BT-55's (15" long)
• 1 BT-55 coupler
• 18"x24mm Body tube for "engine Mounts"
• Shock cord; ¼"x 24+"
• 3, 4"x"36"x1/8 balsa sheets/basswood
• 1 "quest" egglofter nosecone
• 1 (18") parachute, & shroud line
• "non-hardening" clay
• (8) bic pen caps t' "simulate 8 motors"
• 2 spent "D" engines
• Templates (will be loaded shortly)

Just wanted t' interject for a moment. Avast, arrr, me proud beauty! Blimey! Hope you find this rocket as much o' a challenge t' build as I found to design it, without t' help o' any "Cad software." If anyone cares t' "plug" these measurements into a cad program, shiver me timbers, shiver me timbers, I would be very curious as t' t' result. I did use EMRR "Calculators" for t' shrouds and centerin' rings. Ahoy! Avast, me proud beauty! Blimey! I thank Nick for makin' available because without them, couldn't have made this design. Ahoy!

This design is for "Personal use only" and nay for resale, me bucko, ya bilge rat, with express permission o' myself, ya bilge rat, Glenn Roth.

I stated in "parts" section that t' balsa is very fragile. Just discovered Tech Report # 29, from www.apogeerockets.com; "Take your rocket t' Supersonic Speeds. Aye aye! " This is a compromise t' replacin' entire fin with basswood or ply. You can download this free report and make these large fins MUCH STRONGER! I tried this on 3 of me fins and they are NOTICEABLY stronger.

ASSEMBLY:

Read thru all instructions before proceeding. Avast! Options exist. Blimey! Begad!

**Not happy with way main "body shroud" turned out. Avast, me proud beauty! This "posterboard" is hard t' keep smooth without "kinking." You might want t' A) shorten t' about half t' length; b) wrap it around a smooth form of some kind while gluing, shiver me timbers, t' keep smooth.**

1. Gather parts, make templates, ya bilge rat, and gather followin' tools: sharp razor knife, metal ruler, arrr, ya bilge rat, scissors, carpenters square, 2 "spent D" engines, adhesive spray, me hearties, (worn out windshield wiper. Begad! Blimey! For engine hooks)., shiver me timbers, protractor, and compass. Begad! Ahoy! Blimey!
2. Cut two engine mounts from 24mm body tube. Ahoy! Main 2 " long and "booster" 3 1/2" long.*****note: Now that t' rocket is half done, arrr, t' shroud looks too short. Well, blow me down! I have increased length from 3 t' 3 ½ inches or longer, in instructions. Arrr! You'll have increase length o' shroud accordingly.****
   • *** OPTION: I've since elected t' use a "friction fit", me bucko, instead o' an engine hook, on main motor. I'm sure you can use one but, have t' "dry fit" b 4 assembly.*** I've discovered that with t' aft "body panels", extendin' an inch, matey, ya bilge rat, matey, it's very difficult t' use an engine hook. Ya scallywag! Arrr! I've since elected t' slip "main motor" into booster engine mount, and tape. Begad! Avast, me proud beauty! T' tape will require a "slit" into it, so makes easy separation.
3. Glue 24mm engine block into end o' engine tube w/engine hook stickin' into it. Ahoy! Avast, me proud beauty!
   • Option*** This designed as a "two stage". Begad! Begad! If you want an easier conversion t' single stage, ya bilge rat, you may want t' insert "booster engine tube" in a section o' BT-55. Avast, arrr, me proud beauty! Then usin' a BT-55 coupler, arrr, fasten t' engine tubes together. Avast, me proud beauty! Arrr! (skip 1st /main engine tube.) It is much easier buildin' booster shroud separately. Well, blow me down! Avast, me bucko, me proud beauty!

Main Engine Tube

1. Glue t' BT55 centerin' rings on main engine tube. Begad! Let dry. Begad!
2. You'll want t' "dry fit" main engine mount and make sure "spent engine" recessed inside BT55 about ¼". Blimey!
3. Mark Bt55 where "engine Hook" will be, shiver me timbers, and cut a slot 1/8" x3/8".
4. Glue main engine mount with engine hook lined up with slot in BT55.

Booster Engine Mount

1. Take 3" piece o' 24mm BT; then cut 1/8"x 3/8" slot in one end. Avast, me proud beauty!
2. Lay "flat" side o' hook inline with slot and tape. Arrr! Blimey! *** I used a long piece o' old wiper blade for hook and cut t' length later.
3. Cut out 3 "rear shroud centerin' rings. Well, blow me down! ***Tip: when I cut out middle o' rings FIRST, arrr, I then took a spent engine and inserted and twisted t' check for a tight fit. Then inserted engine in tube for support. Begad!
4. Take largest aft rin' and glue over aft engine mount WITHOUT coverin' slot in t' mount. Ya scallywag! Be careful nay t' get glue on motor!!
5. Glue middle and end centerin' rings and remove spent motor and let dry.
6. While drying, cut out aft shroud. Begad! (You will see I include pattern, showin' a "saw tooth design" on inside radius o' shroud. Begad! Ya scallywag! Cut design in shroud. Begad! Much easier t' glue.)
7. Shape shroud, me hearties, tape together on inside.
8. Fold "teeth" over t' inside and make a sharp crease. Straighten out. Aye aye! Avast, me proud beauty!
9. After center rings on engine tube have dried, me hearties, take some glue and apply t' edges o' rings. Ya scallywag!
10. Take shroud and slip over engine assembly. Avast, me proud beauty! Be sure t' get completely in.
11. Spread some glue on smallest centerin' rin' and fold shroud "teeth" down, matey, me hearties, holdin' till set. Ahoy! You may only be able t' do a few @ a time. Let dry Thoroughly. Avast, me proud beauty!
12. Put a spent engine in "Main and aft " engine mounts. Blimey! Blimey! Arrr! Blimey!
13. Slide together, linin' up "slots" in engine tubes. T' aft engine tube should slide over t' Main engine about ½" and stay in place. Arrr! ***Make sure aft Booster engine is as far forward as it will go WITHOUT disengagin' t' booster. Aye aye! Avast, matey, me proud beauty!
14. Mark t' aft engine hook , ya bilge rat, cut and bend t' correct size. Aye aye!
15. Cut shock cord mount and glue shock cord t' it. Aye aye! Avast!
16. Slide "loose" end o' shock cord thru a BT55 coupler. Avast, me proud beauty!
17. Glue Shock cord mount t' inside o' BT55 containin' engine mount far enough inside t' be able t' glue BT55 coupler. Well, blow me down! Ya scallywag! Glue Bt55 coupler and let dry. Avast, shiver me timbers, me proud beauty!
18. Cut other BT55 t' length so when t' two r put together , you have a rocket body 23" long, "without" aft shroud. Begad! Blimey!
19. Cut out Main Body centerin' rings. Ahoy! (u can take spare piece o' BT55 t' check fit). Ahoy! Aye aye!
20. Take t' "fin template" and mark 3", 3.5" rin' where it will engage each fin. Avast, me proud beauty! ****Note: you can mark 4" rin' but, me hearties, because o' size, matey, it won't line up with other two rings. You will have t' do slots on this rin' once it is mounted.
21. Take care, cut a ¼" deep slot x 1/8" wide into each ring.
22. Mark 1st slot on each rin' with a #1 for reference. Avast!
23. Make a fin from 1/8" "Basewood/plywood" as a guide t' check fit o' fins. Well, blow me down! Blimey! It will also b used t' as guide for slots, and cut initial fin slots in 4" ring.
    • ***You may want t' fasten up aft shroud again w/spent motors t' check placement o' centerin' rings and fins.***

Fins and Body:

1. Cut out 8 fins, ya bilge rat, and use sealer if desired. Avast, me proud beauty! Blimey!
2. Use fine guide and cut slots in each fin: 1" from aft o' fin, ya bilge rat, 1x1/4 deep. Next one 7" from end.
3. Last slot is 2.5 " from previous slot and only 5/8" deep. Avast! Avast, me proud beauty!
4. These r initial slots. Begad! You may have t' widen for proper fit. Well, blow me down! Avast!
5. Slide center rings on BT one @ a time. ***If seems tight or binds, increase size o' hole slightly. You can use a piece o' BT55 t' "shape" hole. Ahoy! (you want t' maintain a fairly tight fit). Aye aye!
6. Space rings approximately same distance as slots on fin. Aye aye!
7. "Orientate" all 3 rings with #1's lined up. Begad! Blimey!
8. Take your "Guide Fin", matey, ( t' one made from plywood), and check slot lineup for first fin. Begad! Ya scallywag!
9. You'll have t' cut slots deeper in each ring, checkin' fit each time. Arrr! You may nay even need a slots for 4" ring, me bucko, shiver me timbers, till ready t' glue on fins, ya bilge rat, arrr, matey, due t' a "redesign", arrr, and linin' up o' fin with "center ring slots," I made for simplicity. (make recess higher, about 1 ¼"). Begad! Begad!
10. After you get a good fit for t' fine on t' center rings, take a "real" fin and glue in #1 slots of rings. (I kept breakin' balsa fins, matey, matey, that why I recommended goin' t' a sturdier material, such as basswood or Tims Tech report #29, arrr, gluin' "notebook paper" t' exterior o' fin first for strength).
11. Take guide fin and check next set o' slot, adjustin' for correct fit. Well, blow me down! Begad!
12. Then glue 3 center rings in place. Arrr!
13. Glue all 8 fins in place, checkin' fit first with "guide fin". Avast, me proud beauty!
14. Cut out two "body templates". Arrr! Avast! Make a slice at end o' each one ¼-3/4" deep, 1" from end on each side. Begad! Fold over @ slices and straighten out. Blimey!
15. Dependin' upon which set o' fins you start with, me hearties, will determine what size template t' use, medium or large.
16. Lay template betwixt fins, and gently push down. Begad! Aye aye! Blimey! It should hang out rear, betwixt fins 1", me bucko, up to "slices."
17. Check front o' template and mark where template extends past fin. Arrr! Well, blow me down!
18. Cut on t' mark, down t' ¼" fold mark on each side. Arrr! Blimey! Cut a "saw tooth" pattern in sides of body templates. Begad! Blimey! Makes for easier gluin' and smoothin' out. Well, blow me down! Blimey! ***see photo"***
19. Before gluin' fins, I made "fin supports," ½" x 1 ¼", and glue betwixt ends of fins. Arrr! Ya scallywag! Also, me hearties, shiver me timbers, made a bevel on each end. Begad! **See photo**
20. Glue in place and repeat for each set o' fins. ***remember t' check fit! (Center on BT) too. Blimey! Ahoy! T' aft o' body template should be about ½-3/4" above body and aft shroud.
21. Cut out "body templates," with "saw-tooth" design on edges and glue betwixt fins. Arrr! Blimey! Ahoy! Blimey!
22. Main Body Shroud: As I stated in beginning, nay happy with t' way this one turned out. Aye aye! Ahoy! You may want t' shorten or find a different material or wrap around a "form" t' keep smooth. Arrr! Begad! Also, use same "saw-tooth" design for edges before gluin' in shape o' cone. Blimey! Begad! Once glue, let DRY THOROUGHLY.
23. I fitted over main body tube t' fins. Aye aye! I marked where touched fins and cut slits about 1" long, me bucko, in shroud. Keep fittin' till you get a tight fit into slots, then glue and let dry thoroughly.
24. Now comes a tricky part. Arrr! Seams that r formed betwixt "fins, body templates, matey, main shroud have t' be "filled." I opted t' use "Elmers wood filler" and nay happy with result. Begad! Begad! Friend recommended these tiny silicone beads you mix w/epoxy. Strong, light, and easy t' sand after hardened. Well, blow me down!
25. After seams dry, sand till smooth.

Nosecone Fins:

1. Looking @ picture o' t' rocket I was copying, ya bilge rat, "upper fins" aren't really in nosecone but, I liked this location better. Aye aye! Ahoy! (You can opt t' move out o' nosecone, down body a few inches in "same configuration.)
2. Cut slits in nose cone ½" from end o' "open" nosecone, shiver me timbers, about 2" long and 3/16-1/4" wide. Begad! ** b careful nay t' cut all t' way thru t' end o' nosecone**. Begad! Ya scallywag! I mounted a piece o' 1" aluminum angle iron t' a piece o' wood and clamped t' me table as a guide. Blimey!
3. Fit fins in slots one @ a time, trimmin' slots till fins fit. Ya scallywag! Remove fins and put a ball o' clay in tip of nosecone and press into place. Begad! Begad!
4. Replace fins 1 @ a time til they "touch" in middle o' nosecone and glue. Blimey! (I opted for "gorilla glue" type). Aye aye! It foams up and becomes very strong). Begad! Let dry.

Nose Cone:

1. Keep addin' balls o' clay, fillin' void in nosecone, and pressin' into place. Blimey! Aye aye! ****remember t' allow room for end o' nose cone t' slide in.****
2. Also, me bucko, as you r fillin' void, assemble nosecone and check for CG with motors in main and booster BT's. Aye aye! Blimey! (goin' to take a few ounces o' clay t' fill and balance rocket so CG approx. Begad! Well, blow me down! in middle.)
3. Once clay pressed into place and you r satisfied w/location o' CG, ya bilge rat, assemble nosecone. Begad!

Finishing:

1. Get 8 "regular" bic pen caps and cut off "pocket clip."
2. Paint rocket color o' preference. Ya scallywag!
3. After you r sure you have color o' rocket and finished painting, sand a flat spot on each "pen cap," and glue in place betwixt each fin above booster shroud. Arrr! (These pen caps simulate 8 motors o' rocket). Avast, me proud beauty! Well, blow me down!
4. Prep rocket and you r ready t' fly. Arrr! Blimey! Begad! Blimey!
5. I would rate this build a 5++. Very difficult.

Flight:

My first flight was very successful. Well, blow me down! Blimey! I used a E9-4. Blimey! Blimey! Blimey!

Preparation a little different than usual but, matey, easy. After loadin' an 18" parachute, dusted with baby powder, and t' wadding, I loaded t' engine. Begad! I loaded it into t' booster from t' "inside." (T' E9 is a much longer motor than t' D.) Then I applied a little maskin' tape t' t' end for a "friction fit," and inserted it into main rocket body. It flew great! Relatively straight for t' design, 11 fins, matey, ya bilge rat, and t' weight. Ahoy! Ahoy!

T' shock cord, me bucko, attached t' rocket, was Keelhaul®©™. Aye aye! Then an elastic, me bucko, tied t' t' Keelhaul®©™, ya bilge rat, matey, which proved t' b t' weak. (will explain in next flight).

Parachute deployed perfectly and landed about 30 yards away. Begad! Begad!

SECOND FLIGHT

Another story. Ya scallywag! I designed this rocket t' be an optional 2-stage. Arrr! Blimey! I prepped t' parachute t' same way. Well, blow me down! Arrr! Then taped t' booster, ya bilge rat, a D12-0, t' t' main motor, arrr, arrr, a D12-3, ya bilge rat, with scotch tape, and put a small slit in it, ya bilge rat, t' help with separation. Begad! Once motors finished, I loaded it in booster stage first, me hearties, from t' "inside." Then added some maskin' tape t' t' main motor and "friction fit" it into main rocket. Ya scallywag! Ya scallywag! For whatever reason I couldn't get motors all t' way in t' main rocket body. ( I believe I used too much tape). Blimey! Arrr! At launch, it flew down range, weathercocked. Well, me bucko, blow me down! Then deployed nosecone & parachute at a very low altitude o' about 50 ft. T' extreme weight of rocket snapped shock cord and rocket crashed. I'll be usin' a much heavier, arrr, and longer cord for t' next flight. Begad! Arrr! Still content with flight because it sustained minimal damage. This was me first 2-stage rocket o' me own design.

THIRD FLIGHT

My third launch went absolutely perfect!! After addin' a 1/4" "heavy" shock cord, I prepped rocket same way, with same motors. Arrr! A D12-0 Booster, arrr, arrr, me hearties, taped t' a D12-3 Main. (Just make sure you have enough tape around main motor for "friction fit," and it's taped t' booster. Well, blow me down! Motors ***all t' way in*** main rocket. Begad! Ya scallywag! Slit cut in tape. Arrr! Picture perfect flight!! Booster took it t' a height o' o' about 75-100' and main an additional 100-200 ft. Perfect chute deployment and soft landin' about 75' away. Arrr! Ya scallywag!

Summary:

Pros: Challenge t' design and build.Impressive liftoff w/2stages.

Cons: Very time consuming. Avast, matey, me proud beauty! Built a smaller version first t' get aquainted with a "building technique" for addin' 11 fins! Highly reccommend when tacklin' a new build when in experienced. Blimey! Begad! Alighnin' body panels betwixt fins a pain!

At almost 14 ozs., I would opt for a E30-4 motor for 1st flight. Avast, me proud beauty! Begad! (E9-4) went well today. (use a spent motor in main body and tape E t' it in booster stage, matey, me hearties, (friction fit spent motor). Avast! *****1/4" launch rod only!!****. Begad! Ya scallywag! 18" chute minimum!

Other:
Highly recommend "apogeerockets" tech report #29, "Take your rocket t' supersonic speeds", me hearties, ya bilge rat, for durability o' fins. Avast, me proud beauty! Motor stagin' critical! Must b completely in main body so aft shroud close enough t' it. Used two 1/4x 2" soda straws on a fin for launch lugs.