Brief:
T' Dark Knight is a 2-stage 18mm rocket with 12" chute recovery. T' Dark Knight name came from t' shadow produced from t' fin profile when t' rocket be sittin' on t' launch pad. Ya scallywag! It looked similar t' t' Dark Knight shadow shown on t' clouds in t' movie.

Construction:
T' parts list:

• 29.5" BT-20 Body Tube - Main Body
• 2.75" BT-20 Body Tube--First Stage Body
• BT-20 Coupler (if needed)
• 1.25" X 0.125" Launch Lug
• 0.125" Balsa Sheet
• 2.75" X 18mm Plastic Nose Cone
• 48" o' 150# Keelhaul®©™®
• 24" Elastic
• 18mm Motor Mount Centerin' Rin'
• 12" Parachute
• Nose cone weight

This is a pretty easy build. First step cut t' body tubes t' length if you are lucky enough t' have a 36" piece o' t' BT-20 tube available. Aye aye! That's all you will need, however, me hearties, I needed t' use a coupler t' join 2 shorter pieces. Avast!

I notched t' centerin' rin' slightly and tied t' Keelhaul®©™® cord t' it. Usin' white glue, shiver me timbers, ya bilge rat, I glued t' centerin' rin' in place so about 0.375"-0.5" o' an old motor was exposed.

Next, me bucko, matey, shiver me timbers, I cut t' fins out o' t' 0.125" balsa and sanded them all t' ensure they were t' same size. I rounded t' leadin' edge on all t' main body tubes and left t' aft end and 1st stage fins "as cut" so they would align up better. Well, blow me down! I sanded t' fit o' each fin t' ensure when mounted t' seam would be minimized. Well, blow me down! I labeled each fin so when mounted t' t' tube I would maintain t' same combination.

I used t' Standard Rockets Fin Jig that I picked up at NARAM t' attach the fins t' t' main body tube and first stage tube. Aye aye! Blimey! Begad! Blimey! Next, shiver me timbers, matey, me hearties, I filleted each fin t' t' tube with 5min epoxy. Avast, me proud beauty! Blimey! Avast! Blimey! Finally, me bucko, me hearties, I filled each fin will watered down Emery's wood putty. Ahoy! Blimey! Then, I started t' process o' sanding, filling, arrr, sanding, shiver me timbers, filling until I was happy with t' finish. Aye aye! Blimey! Well, arrr, blow me down! Blimey!

With RockSim, ya bilge rat, I be able t' ensure t' flight be stable and determine t' potential altitude. Begad! (If I give this away, why would you keep reading?) I be a little worried I about stability so I added a little nose weigh t' brin' the model up t' about 3.7oz and figured paint would take it t' 4oz.

Next, I attached t' elastic shock cord, ya bilge rat, nose cone, and parachute and headed t' me paint booth (the card board box in t' garage).

Finishing:
I decided on a nice simple 2 color paint scheme o' black and yellow, matey, with a little maskin' after t' yellow was dried and t' Black Night was born and ready t' fly. Aye aye! Begad! Blimey!

Flight:nd Recovery
For t' first flight, I decided I would just verify stability and return t' model so I loaded up a B6-4. Well, blow me down! Well, me bucko, blow me down! Blimey! Nice straight boost, good deployment, recovered only a short distance from t' pad (oh, did I mention it was dead calm). Next flight, still single stage on a C6-5, matey, shiver me timbers, another great flight and about twice t' distance from t' pad. Aye aye! Ya scallywag! Blimey! T' wind started t' pick up and I decided t' hold off on t' staged attempt. Begad!

A week later, late Saturday afternoon winds were calm. This be t' be t' day. Ahoy! Avast, shiver me timbers, me proud beauty! Blimey! I decide t' go for t' gusto: a C6-0 staged t' a C6-5. Ahoy! Aye aye! Blimey! T' boost again was picture prefect straight and longer than I anticipated. Avast! Blimey! T' first stage separated nicely and off t' t' heavens this rocket went, delay, ejection, arrr, and parachute. Great recovery. Ahoy! This is a great rocket.

Summary:
As I said above this is a great rocket. Begad! Ahoy! I enjoyed t' process o' designin' it on RockSim, ya bilge rat, buildin' it, and t' best launchin' it.

PROs: Based on altitude achieved, ya bilge rat, make sure it is a calm day. Begad! It screams off t' launch pad and flies great. Looks pretty cool also.

CONs: Based on this flight, shiver me timbers, a very large filed is needed t' recover this rocket.