Plywood Big Daddy Upgrade Set

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  • Plywood Big Daddy Upgrade Set 24mm
  • Plywood Big Daddy Upgrade Set 24mm Shock Cord Mount Detail
  • Plywood Big Daddy Upgrade Set Shock Cord 24mm Mount Anchor Detail
  • Plywood Big Daddy Upgrade Set 29mm
  • Plywood Big Daddy Upgrade Set 29mm Shock Cord Mount Detail
  • Plywood Big Daddy Upgrade Set 29mm Shock Cord Mount Anchor Detail


Upgrade your Big Daddy fins and centering rings to plywood, through-the-wall fins! Strong plywood construction and TTW design ensures that you spend more of your flight time flying, and less time repairing broken fins. The forward centering ring features a secure shock cord mount that just needs some wood glue or epoxy to secure in place. Set includes 4 fins and 2 centering rings, sized to fit either a 24mm or 29mm motor mount. the 24mm version uses the Big Daddy's stock 24mm motor tube, or you can choose to add the 29mm motor mount, in either model rocket sized thin wall, or mid power heavy wall thickness.  Other options include a 3D printed screw on motor retainer to match your motor mount diameter, rail buttons, launch lugs, nylon parachute upgrade, motor adapters, and lead shot nose weight.

Important Note about Stability

By adding heavier fins and centering rings, and flying a heavier motor in a short stubby rocket like the Big Daddy, you will need to add more nose weight to maintain stability. Be sure to model your upgraded kit and add nose weight to ensure your model's center of gravity (CG) is at least 1 airframe diameter forward of the center of pressure (CP).  You'll find an example Rocksim files below to start your modeling, but you should override values with your as-built CG and CP prior to final determination of stability before flight. You're likely to need up to 150 grams of nose weight to stabilize a 29mm F motor, so watch your launch velocity to make sure your heavier rocket is leaving the pad between 15 meters/second and 25 meters/second. You will likely need to rule out low thrust motors like the Estes D12 and E12 with this upgrade, due to their  dangerously low launch velocity.

Adding Nose Weight

The No. 9 lead shot available as nose weight must be secured inside the tip of the nose cone with epoxy. First, scratch up the inside of the nose cone tip with the end of a launch rod or another tool; this is critical, since epoxy will not stick well to smooth plastic. Once you calculate the amount of nose weight you'll need to stabilize the rocket, invert the nose cone and pour a bit of epoxy into the tip. We recommend 30 minute epoxy for this task, as you're adding epoxy and shot alternately until all the shot is embedded in epoxy.  Then, use a paper funnel to pour the lead shot into the nose cone so it lands in the epoxy. pour enough to cover the epoxy puddle fully; the lead shot will sink into the epoxy over the next several minutes Add more epoxy, then more shot, until all the shot is in the epoxy. The shot will continue to sink into the epoxy before the epoxy hardens.  After working with lead shot, be sure to wash your hands and surfaces, as it is not something you or those around you should ingest. The epoxy envelops the lead shot so it is not a hazard once it is encased in epoxy.

Product Documentation

A PDF file of the product documentation is available here.

Simulation Files

rocksim-logo.jpg Design File with Balsa Fins and 24mm MMT
rocksim-logo.jpg Design File with Plywood Upgrade Kit and 24mm MMT
rocksim-logo.jpg Design File with Plywood Upgrade Kit and 29mm HW MMT



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Additional Information

# Fins per Package:
Weight for 3 fins:
72 grams
1/8 inch
Root Cord Length:
4.96 inches (126 mm)
3.94 inches (100 mm)
Tip Cord Length:
2.76 inches (70 mm)
Tab Depth:
0.75 inch (19mm)
Tab Length:
4.5 inches (114 mm)
Tab Offset:
0.26 inch (6.7 mm)
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