Brief:
T' Dark Knight is a 2-stage 18mm rocket with 12" chute recovery. Well, blow me down! Blimey! T' Dark Knight name came from t' shadow produced from t' fin profile when t' rocket was sittin' on t' launch pad. 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. Blimey! First step cut t' body tubes t' length if you are lucky enough t' have a 36" piece o' t' BT-20 tube available. Blimey! That's all you will need, however, I needed t' use a coupler t' join 2 shorter pieces. Well, blow me down! Ahoy!

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

Next, matey, I cut t' fins out o' t' 0.125" balsa and sanded them all t' ensure they were t' same size. Begad! 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. Avast! I sanded t' fit o' each fin t' ensure when mounted t' seam would be minimized. Begad! 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. Arrr! Next, I filleted each fin t' t' tube with 5min epoxy. Blimey! Finally, arrr, I filled each fin will watered down Emery's wood putty. Avast! Then, I started t' process o' sanding, shiver me timbers, filling, shiver me timbers, sanding, me hearties, filling until I was happy with t' finish. Arrr!

With RockSim, arrr, I be able t' ensure t' flight was stable and determine t' potential altitude. (If I give this away, matey, why would you keep reading?) I was 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, me bucko, 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, ya bilge rat, matey, with a little maskin' after t' yellow was dried and t' Black Night be born and ready t' fly. Ya scallywag!

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

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

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

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

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