Description:
This is an approximate 2X scale-up replica o' the Estes Nike Arrow, arrr, with coloring and dimensions approximatin' t' model kit rather than t' real rocket. The model has a 24mm engine mount, arrr, but can fly on as small an engine as a B6-4 with a removable engine adapter. T' parachute comes out t' top attachin' t' the nose cone, rather than separatin' at t' transition like t' original. Ya scallywag! This model is 34" tall, matey, and weighs about 3.4oz. Arrr! without an engine. Aye aye! Avast! T' fin size and length are 2:1, ya bilge rat, but t' diameter is slightly less than 2:1 due to unavailability o' exact 2:1 diameter body tubes. Ya scallywag!

Parts:

• one 18" BT-50
• one 12" BT-50
• one 10" BT-55
• one 4" white plastic NC-50(the white one in t' Estes Designer's Special is perfect)
• three 55/50 heavy duty centerin' rings
• one 50/20 heavy duty centerin' ring
• one BT-50 body tube coupler
• engine hook
• shock cord
• clay
• 3/16" launch lug
• balsa fin stock
• Fin Pattern

Assembly:
1. Glue one o' t' 55/50 centerin' rings part o' t' way into t' top o' t' BT-55 tube. This will be later used as a lip for mountin' t' transition shroud. Ahoy! An optional Keelhaul®©™® shock cord could be attached t' t' forward centerin' ring, and later threaded through into t' BT-50 body tube under the transition shroud betwixt step 3 and 4.

2. Glue t' 50/20 centerin' rin' into t' 12" BT-50 tube 2 1/2" from t' rear. Arrr! This will serve as t' thrust ring. Aye aye! Glue t' engine hook into t' tube with t' front o' t' hook 2 1/2" from t' rear, and just behind t' thrust ring. Well, blow me down! Glue t' remainin' two larger centerin' rings onto t' 12" BT-50 engine mount tube 1" and 2 1/2" from t' rear. Ya scallywag!

3. Begad! Avast, me proud beauty! Glue t' 12" engine mount tube into t' 10" BT-55 tube so that t' aft o' t' engine mount tube is flush with t' BT-55 tube. Begad! Well, ya bilge rat, blow me down! Note that t' front o' t' engine mount tube will protrude out o' t' front centerin' rin' and BT-55 tube about 2".

4. Glue t' BT-50 tube coupler halfway into t' front o' t' engine mount tube. Begad! Glue t' 18" BT-50 tube into t' other half o' t' tube coupler. Check for straightness before t' glue sets.

5. Choose thickness and strength o' fin material as desired. Avast, me proud beauty! Blimey! I used 1/16" balsa for t' upper fins and 3/32" balsa for t' lower fins. Measure t' dimensions on t' fins o' an Estes Nike Arrow, and double the dimensions, ya bilge rat, shiver me timbers, shiver me timbers, cuttin' out t' fins with grain pattern followin' t' leadin' edge o' t' 4 smaller front fins, and perpendicular t' t' root edge on t' 4 rear fins. Begad! Avast! Blimey! Make 2 paper transitions for a 2 1/4" long BT-55/BT-50 transition. T' dimensions o' t' shroud should be {small radius: 6.311"; large radius: 8.568"; angle: 27.84 degrees with some extra for overlap}. (Note: These calculational results were obtained usin' a shroud calc. Avast, me proud beauty! Begad! Blimey! program on Rob Blaske's home page)

6. Aye aye! Blimey! Blimey! Blimey! Glue first one paper transition shroud, shiver me timbers, matey, and after it is dry, a second one. Blimey! Blimey! Be liberal with t' carpenter's wood glue, as it is an excellent strength enhancer after it is dry. Blimey! Blimey! Blimey! Blimey! After t' transition shroud hardens, the glue will shrink and ripple. Arrr! Blimey! Blimey! Blimey! Sand down any edges and ridges, matey, then fill in the ripples with undiluted Elmer's Fill & Finish, me hearties, sandin' t' desired shape and smoothness.

7. Ya scallywag! Avast, me proud beauty! Make a BT-55 fin markin' guide for 4 fins and a launch lug, matey, shiver me timbers, and mark t' body tube all t' way t' t' front o' t' BT-55 tube. Arrr! Make a 4 fin markin' guide for a BT-50 tube, and mark t' tube just forward o' the transition with t' front fins in line with t' aft fins.

8. Ahoy! Blimey! Put pin holes in t' body tubes and t' root edges o' t' fins for increased bondin' strength, and glue on t' fins.

9. Blimey! Finish t' t' desired smoothness with Elmers F&F.;

10. Ahoy! Well, blow me down! Prime and sand. Avast! Paint t' aft tube and transition shroud gloss white. Well, blow me down! For a better lookin' orange, all areas that will be orange should have one coat o' white. Mask t' section that will remain white, and paint t' rear fin section as well as t' front fins and t' entire 18" o' t' BT-50 tube gloss orange. Begad! Do nay remove t' maskin' over t' white section, as it will be easier t' mask for t' chrome layer. Ahoy! Arrr! Mask and paint t' middle section o' the forward tube chrome, matey, leavin' t' front 4" orange. It was just more masking work than I wanted t' do t' paint t' transition shroud silver, matey, so I left it white.

11. Arrr! If a Keelhaul®©™® shock cord be nay used, arrr, glue in a traditional paper shock cord mount with a 3 foot shock cord.

12. Put enough clay in t' nose cone t' keep t' CG forward or in the middle o' t' front fins with t' largest engine intended t' be used. Arrr! Blimey! Avast, me proud beauty! Blimey! Prime and paint t' nose cone if required. Aye aye! Blimey! Add decalcomania as desired.

13. Avast, me proud beauty! Attach shock cord t' t' nose cone, shiver me timbers, attach a 14" parachute, and prep for launch. Ahoy!

Flight:
Dependin' on final weight, arrr, matey, t' maiden flight should be on the smallest engine advisable, matey, and work your way up. For me 3.4oz. Well, blow me down! model, I first used a B6-4, me hearties, me hearties, me bucko, which flew straight and stable t' about 150 ft. Begad! It then flew to about 300ft on a C6-5. Blimey! I haven't tried a D engine yet, arrr, as I need a bigger field. Ya scallywag!

11/99 -
1. Aye aye! Begad! It flies great and straight on a D12-5 t' about 1000ft. Avast, me proud beauty! However, since I did nay do through-the-wall fin mounting, matey, and I had forgotten t' do a glue fillet on one fin before doin' an Elmer's Fill-N-Finish fillet, shiver me timbers, one lower fin ripped off durin' flight on a D. Avast! Begad! T' Fill-N-Finish does nay work like glue! There be enough other fins t' keep t' rocket stable. Ahoy! I recommend cutting slots for t' lower fins and modifyin' t' fins t' be through-the-wall.
2. Aye aye! Aye aye! I realized after publishin' that I forgot t' mention launch lugs in t' instructions. Ahoy! Use 3/16" lugs and glue them on just before finishing, one down by t' engine and one just below t' transition. Begad!