Semroc Hydra VII

Semroc Flying Model Rocket Kit Hydra VII™ SEM-KV-29 Improved

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Skill Level:
4 Expert
Motor Mount Size:
18mm x 7

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Semroc Flying Model Rocket Kit Hydra VII™   SEM-KV-29 Improved

Body Diameter 1.64" (4.2cm)

Length 30.5" (77.4cm)

Fin Span 6.9" (17.6cm)

Net Weight 5.2oz (147.6g)

Fins Laser-Cut Balsa

Nose Cone Precision Turned Balsa

12" and 18" Parachute Recovery  

Colorful Water Slide Decals  

Skill Level 4 - Expert

Stages Single  

Made in the USA

Uses (one)C6-3, (three)C6-5, 

or (seven)C6-7

1969 reproduction


Model Rocket Kits are rated by Skill Level

1 Beginner

2 Intermediate

3 Advanced

4 Expert

5 Master

If you are just starting in the hobby start at the beginner level and move up from there at your own pace.

What is needed to build and fly

All model rockets come in kit form that require assembly.  The materials are primarily cardboard tubes, balsa or plastic fins and nose cone.  Materials will vary by model and are typically specified in the description of each kit. 

Additional supplies will be necessary to build and finish your model rocket kit and may include:

Scissors, Hobby Knife


Wood Glue, Model Cement or CA(Super Glue)


Masking Tape

Finishing Supplies like:

Wood Filler



Launching Equipment and Supplies like:

Recovery wadding

Launch Pad

Launch Controller

Power supply

Model Rocket Motors and Igniters

A safe place to fly using guidelines from the National Association of Rocketry Safety Code

Warranty for 1 year from manufacturer defects
  • 5
    Jonathan Wilkins

    Posted by jonathan wilkins on 31st Dec 2019

    My favorite kit ever! I followed the instructions which were well written and illustrated. The only thing I did different was I painted as I went as I completed sub assemblies. I left out 5 plugs which ensures chutes are deployed and allows more cluster configurations. I have flown mine about 10 times from 3 engine to 5 engine clusters. It flies straight and true, the smoke, flames and roar really give a crowd pleasing flight! Excellent parts and quality service from erockets and semroc as always!

  • 5
    Excellent rocket!

    Posted by Andrew B on 23rd May 2019

    Very good rocket kit, and I highly recommend building it! It's a little bit difficult at some points, but overall is a very fun kit to build and fly!

  • 5
    A unique low-power cluster rocket kit

    Posted by Larry Howell on 27th Dec 2018

    These are my initial impressions, as I haven't built the kit yet. This is a very unique and challenging kit! I'd recommend the builder have experience building 2 or 3 motor cluster kits before taking on the challenge of this kit. The components are all high quality. The instructions appear to be through and full of details. Only normal building skills are needed, but the builder must follow the instructions carefully. This is due to the high component count in the kit and the way they all fit together. Launching a 7-motor cluster isn't trivial either, so prior experience with launching cluster models is needed. It is designed to fly as a single motor model, or as a 3-motor or 7-motor cluster model. I plan to try to hack the kit to also allow it to also fly as a 4-motor cluster.

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