Brief:
11 "Finned" rocket that can be launched on a single "E" or staged (D12-0, 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, ya bilge rat, posterboard, and second hand parts, etc. Begad! It would have been ten times harder without t' EMRR "Calculators", shiver me timbers, ya bilge rat, for shrouds, me bucko, me hearties, etc. I chose cardboard figuring, matey, "If I can get this t' fly without a cad program, arrr, from t' heaviest material, I surely will be able t' build one in t' 24 MM scale. Arrr! Also, cardboard a little easier t' work with than "foamboard."

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

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

Construction:

PARTS LIST:

• 24mm engine block
• 1 engine hooks
• 1 sheet o' foam board, matey, 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, arrr, 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. Blimey! Blimey! Hope you find this rocket as much o' a challenge t' build as I found to design it, arrr, without t' help o' any "Cad software." If anyone cares t' "plug" these measurements into a cad program, ya bilge rat, ya bilge rat, I would be very curious as t' t' result. Begad! I did use EMRR "Calculators" for t' shrouds and centerin' rings. Ya scallywag! Begad! Blimey! I thank Nick for makin' available because without them, shiver me timbers, shiver me timbers, couldn't have made this design. Ya scallywag!

This design is for "Personal use only" and nay for resale, shiver me timbers, with express permission o' myself, me bucko, Glenn Roth. Begad!

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. Begad! Ya scallywag! " 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. Ahoy! Blimey! Ahoy! Blimey! Options exist. Ahoy! Blimey!

**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, t' keep smooth.**

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

Main Engine Tube

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

Booster Engine Mount

1. Take 3" piece o' 24mm BT; then cut 1/8"x 3/8" slot in one end. Well, blow me down!
2. Lay "flat" side o' hook inline with slot and tape. Begad! *** I used a long piece o' old wiper blade for hook and cut t' length later.
3. Cut out 3 "rear shroud centerin' rings. Ya scallywag! Blimey! ***Tip: when I cut out middle o' rings FIRST, me hearties, I then took a spent engine and inserted and twisted t' check for a tight fit. Arrr! Blimey! Avast! Blimey! Then inserted engine in tube for support. Begad! Blimey! Avast, me proud beauty! Blimey!
4. Take largest aft rin' and glue over aft engine mount WITHOUT coverin' slot in t' mount. Be careful nay t' get glue on motor!!
5. Glue middle and end centerin' rings and remove spent motor and let dry. Begad! Blimey!
6. While drying, cut out aft shroud. (You will see I include pattern, showin' a "saw tooth design" on inside radius o' shroud. Begad! Begad! Cut design in shroud. Arrr! Much easier t' glue.)
7. Shape shroud, tape together on inside. Avast! Ahoy!
8. Fold "teeth" over t' inside and make a sharp crease. Aye aye! Aye aye! Blimey! Straighten out. Blimey! Blimey!
9. After center rings on engine tube have dried, matey, take some glue and apply t' edges o' rings. Aye aye!
10. Take shroud and slip over engine assembly. Blimey! Be sure t' get completely in. Avast, me proud beauty!
11. Spread some glue on smallest centerin' rin' and fold shroud "teeth" down, shiver me timbers, holdin' till set. Ya scallywag! You may only be able t' do a few @ a time. Begad! Well, shiver me timbers, blow me down! Let dry Thoroughly. Arrr!
12. Put a spent engine in "Main and aft " engine mounts. Begad!
13. Slide together, me bucko, linin' up "slots" in engine tubes. Begad! Well, blow me down! T' aft engine tube should slide over t' Main engine about ½" and stay in place. ***Make sure aft Booster engine is as far forward as it will go WITHOUT disengagin' t' booster. Begad! Arrr!
14. Mark t' aft engine hook , cut and bend t' correct size. Ya scallywag!
15. Cut shock cord mount and glue shock cord t' it. Ahoy! Well, blow me down!
16. Slide "loose" end o' shock cord thru a BT55 coupler. Ya scallywag!
17. Glue Shock cord mount t' inside o' BT55 containin' engine mount far enough inside t' be able t' glue BT55 coupler. Begad! Avast, me proud beauty! Glue Bt55 coupler and let dry. Aye aye!
18. Cut other BT55 t' length so when t' two r put together , you have a rocket body 23" long, "without" aft shroud. Begad!
19. Cut out Main Body centerin' rings. Arrr! Begad! (u can take spare piece o' BT55 t' check fit).
20. Take t' "fin template" and mark 3", arrr, me hearties, shiver me timbers, 3.5" rin' where it will engage each fin. Well, blow me down! Begad! ****Note: you can mark 4" rin' but, because o' size, shiver me timbers, it won't line up with other two rings. Aye aye! Ya scallywag! You will have t' do slots on this rin' once it is mounted. Begad!
21. Take care, cut a ¼" deep slot x 1/8" wide into each ring. Avast! Blimey! Avast! Blimey!
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. 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, and use sealer if desired. Begad! Begad!
2. Use fine guide and cut slots in each fin: 1" from aft o' fin, 1x1/4 deep. Next one 7" from end. Arrr! Ahoy!
3. Last slot is 2.5 " from previous slot and only 5/8" deep. Arrr!
4. These r initial slots. Avast, me proud beauty! You may have t' widen for proper fit.
5. Slide center rings on BT one @ a time. Avast, me proud beauty! Ya scallywag! ***If seems tight or binds, ya bilge rat, increase size o' hole slightly. You can use a piece o' BT55 t' "shape" hole. Begad! Well, blow me down! (you want t' maintain a fairly tight fit). Aye aye!
6. Space rings approximately same distance as slots on fin. Aye aye! Blimey! Avast, me proud beauty! Blimey!
7. "Orientate" all 3 rings with #1's lined up. Ahoy!
8. Take your "Guide Fin", arrr, ( t' one made from plywood), shiver me timbers, arrr, and check slot lineup for first fin.
9. You'll have t' cut slots deeper in each ring, me hearties, checkin' fit each time. Avast, me proud beauty! Blimey! You may nay even need a slots for 4" ring, till ready t' glue on fins, matey, due t' a "redesign", matey, and linin' up o' fin with "center ring slots," I made for simplicity. Begad! Avast, me proud beauty! (make recess higher, arrr, me bucko, about 1 ¼"). Well, blow me down! 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, that why I recommended goin' t' a sturdier material, such as basswood or Tims Tech report #29, gluin' "notebook paper" t' exterior o' fin first for strength). Ahoy!
11. Take guide fin and check next set o' slot, arrr, ya bilge rat, arrr, adjustin' for correct fit. Ya scallywag!
12. Then glue 3 center rings in place. Ya scallywag!
13. Glue all 8 fins in place, shiver me timbers, matey, checkin' fit first with "guide fin". Avast, shiver me timbers, me proud beauty!
14. Cut out two "body templates". Make a slice at end o' each one ¼-3/4" deep, me bucko, 1" from end on each side. Well, blow me down! Begad! Blimey! Fold over @ slices and straighten out. Begad! Blimey!
15. Dependin' upon which set o' fins you start with, arrr, will determine what size template t' use, medium or large.
16. Lay template betwixt fins, me hearties, and gently push down. Ahoy! Avast! 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!
18. Cut on t' mark, arrr, arrr, down t' ¼" fold mark on each side. Blimey! Cut a "saw tooth" pattern in sides of body templates. Makes for easier gluin' and smoothin' out. Well, shiver me timbers, blow me down! ***see photo"***
19. Before gluin' fins, I made "fin supports," ½" x 1 ¼", and glue betwixt ends of fins. Ya scallywag! Also, me bucko, made a bevel on each end. Well, blow me down! Begad! **See photo**
20. Glue in place and repeat for each set o' fins. Avast! Begad! ***remember t' check fit! (Center on BT) too. 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.
22. Main Body Shroud: As I stated in beginning, nay happy with t' way this one turned out. You may want t' shorten or find a different material or wrap around a "form" t' keep smooth. Also, me hearties, use same "saw-tooth" design for edges before gluin' in shape o' cone. Ya scallywag! Avast! Once glue, shiver me timbers, arrr, let DRY THOROUGHLY. Ya scallywag!
23. I fitted over main body tube t' fins. Begad! Well, blow me down! I marked where touched fins and cut slits about 1" long, me bucko, shiver me timbers, in shroud. Keep fittin' till you get a tight fit into slots, then glue and let dry thoroughly. Well, blow me down!
24. Now comes a tricky part. Seams that r formed betwixt "fins, matey, body templates, me hearties, main shroud have t' be "filled." I opted t' use "Elmers wood filler" and nay happy with result. Friend recommended these tiny silicone beads you mix w/epoxy. Ahoy! Strong, light, and easy t' sand after hardened.
25. After seams dry, sand till smooth. Ahoy!

Nosecone Fins:

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

Nose Cone:

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

Finishing:

1. Get 8 "regular" bic pen caps and cut off "pocket clip."
2. Paint rocket color o' preference. Begad!
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. Avast, me proud beauty! Avast! (These pen caps simulate 8 motors o' rocket). Begad! Ya scallywag!
4. Prep rocket and you r ready t' fly. Ahoy! Avast, me hearties, me proud beauty!
5. I would rate this build a 5++. Very difficult.

Flight:

My first flight was very successful. Avast! I used a E9-4. Ya scallywag!

Preparation a little different than usual but, me hearties, easy. Blimey! Blimey! Well, blow me down! Blimey! After loadin' an 18" parachute, me hearties, matey, dusted with baby powder, and t' wadding, I loaded t' engine. Blimey! Blimey! 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. Begad! Blimey! It flew great! Blimey! Relatively straight for t' design, me hearties, 11 fins, shiver me timbers, and t' weight. Ya scallywag! Blimey!

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

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

SECOND FLIGHT

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

Summary:

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

Cons: Very time consuming. Aye aye! 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. Begad! Arrr! Alighnin' body panels betwixt fins a pain!

At almost 14 ozs., I would opt for a E30-4 motor for 1st flight. Well, blow me down! Blimey! (E9-4) went well today. (use a spent motor in main body and tape E t' it in booster stage, shiver me timbers, me hearties, (friction fit spent motor). Arrr! Blimey! *****1/4" launch rod only!!****. 18" chute minimum!

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