Boosted Bertha

Estes Model #1946


A sport rocket at its core, the second booster of this multistage flying model rocket will push this Bertha skyward, reaching twice the height of the Big Bertha. The Boosted Bertha will reach altitudes of up to 1000 feet when powered with an C6-0 engine in the booster stage and an Estes C6-5 engine in the main rocket.

After the first stage ignites, the booster jettisons and gently tumbles back to earth. Once the rocket reaches apogee, the rocket will deploy the recovery system which is a colorful 18 inch parachute. This provides the Boosted Bertha a light landing so that it can be quickly prepared for another launch.

Additional Information

  • Length: 28.2″
  • Diameter: 1.64″
  • Weight: 4oz.
  • Recovery: 18″ Parachute
  • Parts List
    • Motor Mount Tube – 039303
    • Motor Block (3) – 030162-2
    • Motor Mount Tube – 030408
    • Booster Stage Body Tube Slotted – 030491
    • Card Stock Laser Cut – 090052-1946
    • Stage Coupler Red – 030176-5
    • Wood Sheets Laser Cut (2) – 090051B-1946
    • Wood Sheet Laser Cut – 090051A-1946
    • Launch Lug – 038178
    • Body Tube Main – 030396
    • Nose Cone – 071020
    • Retainer Set Motor – 072421
    • Spacer Tool Yellow – 035003
    • Shock Cord – 038363
    • Parachute – 035802
    • Water Slide Decal – 090001-1946
  • Recommended Motors:
    • Single Stage: B4-2, B4-4, B6-2, B6-4, B6-6, C6-5, C6-7
    • Two Stage
      • Booster: A8-0, B6-0, C6-0
      • Rocket: A8-3, A8-5, B4-4, B6-4, B6-6, C6-5, C6-7


Build History

  • 01/12/2024 – Received as Christmas present From Jeromie. Model shipped from Estes Industries for $32.99 (Retail $32.99). Took pictures of package.
  • 01/14/2024 – Scanned components. Measured components and recorded them in Book #5 Page #14.
  • 01/16/2024 – Marked booster motor mount tube at 1/4″ & 3-1/2″ from aft end. Inside motor mount tube out a line of glue at 2-1/4″ and at forward end. Inserted engine blocks into glue where one is inserted using Insert Tool and other even with forward end. Removed centering rings with holes in them from card stock and glued each at the marks on the motor mount tube. Let glue dry and then filleted joints.
  • 01/17/2024 – Glued tube coupler into forward end of booster body tube. Glued engine block into main motor mount tube using spacer tool so it is 2-1/4″ from aft end. Marked motor mount 1/2″ from aft end and clued a centering ring on the mark and another centering ring flush with forward end. Filleted joints with yellow glue. Used Epoxy weld to attach motor mount retainer to aft end of main motor mount tube. Glued motor mount assembly into aft main body tube with yellow glue so tubes are even with each other. Filleted joint. Glued one fin to main body tube.
  • 01/18/2024 – Glued remaining 3 fins to main body tube fin reference lines. Filleted fin joints. Glued shock cord to shock cord mount and then glued it 2″ inside forward end of main body tube. Glued launch lug to fin joint and filleted joints with yellow glue.
  • 02/01/2024 – Primed with Rust-o-leum #4278914 Flat White Primer.
  • 02/03/2024 – Sanded balsa pats with 120 & 220 grit sandpapers and sanded entire model with 600 & 1500 grit sandpapers.
  • 02/05/2024 – Spray painted entire model with Krylon #8815 Gloss Mandrin.
  • 02/07/2024 – Spray painted one booster and one upper fin with Rust-oleum #328373 High Gloss White.t
  • 02/09/2024 – Applied water slide decals using photo card as a guide. This completes construction of Estes#1946 Boosted Bertha model rocket.