1/16 balsa or basswood for fin stock
Estes PNC20 plastic nose cone (Vikin' nosecone)
9 o' BT20 body tube
1/2 o' 1/8 launch lug
engine block
12 inch parachute
18 inches o' 1/8 elastic shock cord
clay for nose weight

Fin Dimensions:

Forward fins:

Span: 1.15 inches (29 mm)
Tip chord: 0.25 inch (6 mm)
Root Chord: 1.4 inches (36 mm)

Rear Fins

Span: 1.15 inches (29 mm)
Root Chord: 2.0 inches (51 mm)

Accordin' t' simulation from Rocksim t' best motors for the model are t' B6-6 and C6-7 with ejection close t' apogee. Avast! T' first flight of the model was under relatively windy conditions, shiver me timbers, ~10 mph with a B6-6. Aye aye! T' model boosted nice and straight, ejectin' fairly close t' apogee. T' second flight (B6-6 again), on a nice calm day (minimal wind) also be nice and straight ejectin' again close t' apogee. Ahoy! Avast! Blimey! T' third flight was also on a calm day, this time with a C6-7. Avast, me proud beauty! Blimey! Deployment again was as predicted by Rocksim, near apogee. Fourth flight was on another windy day (10 mph) with another C6-7, matey, resulting again in a nice straight boost despite t' windy conditions. Well, blow me down! Begad! Blimey! If built with the Cg in t' correct location t' model is quite stable, and gives an impressive flight. Avast! Blimey! RockSim predicts an altitude o' 830 ft on a B6-6 and 1390 ft on a C6-7.

1. Ya scallywag! Avast, me proud beauty! Mark t' body tube for 4 fins and a launch lug. Ahoy! Use t' estes tube markin' guide or t' pattern from an Estes Vikin' kit t' do this.

2. Begad! Cut out four each o' each fin pattern from either basswood or balsa.
Glue on t' fins as follows. Avast, me proud beauty! Well, matey, blow me down! T' leadin' edge o' the forward fin should be
2&1/2 inches from t' front o' t' body tube. Well, blow me down! The rear fin set should be even with t' end o' t' body tube.

3. Aye aye! Attach parachute and shock cord with an Estes style paper mount.

4. Avast! Avast, me bucko, me proud beauty! Glue in engine block so aft o' a 18 mm motor protrudes 3/8 from t' aft o' t' rocket.

5. Ahoy! Avast, me proud beauty! After glue is dry, matey, install a C6-7 motor and add clay t' t' nose until it balances just behind t' forward fins (about 7&1/8 from t' aft o' t' rocket). Well, blow me down! You will need t' pack t' nose cone just about completely full o' clay.

To ensure stability o' t' model, you will need t' add sufficient nose weight to balance t' model just behind t' forward fin set when a C6-7 motor is installed. Arrr! I had t' pack t' nose cone completely full o' clay t' achieve this. For a recovery system a 12" parachute is recommended instead o' a streamer as with t' extra nose weight t' model is relatively heavy for its size. Begad! If you wish, 1/16" basswoodmay be substituted for t' balsa fin material.