Door Knob
Door Knob
Door Knob
Door Knob
Door Knob

Door Knob

Regular price $257.25

Only -15 items in stock!

Now part of the LOC Custom series of rocket launch kits, which feature factory pre-slotted airframe and through-the-wall fin construction and high power motor capabilities, the DOORKNOB is a great new vehicle to make your Level 2 certification flight with on a small field. Now with LOC-N-FIN technology and the MMAS (Modular Motor Adapter System) for easy building, the DOORKNOB is a light weight large diameter kit with presence.


Door Knob 7.5" rocket kit.  Now equipped with the MMAS system.  No more "fin keepers". Optional bulkhead included. Most tend to epoxy the coupler to the 12" payload to make a 42" 1-piece airframe and eject the cone.

Complexity: Advanced
Diameter: 7.5″
Height: 63.5"
Weight: 13lbs
Motor Mount: 5.5" MMAS includes 54MM Adaptor
Parachute Size: 78″ Ripstop Nylon **Colors are random**
Shock Cord Type: 1"x4' Y Harness, TN-25 Tubular Nylon with sewn loops
Shock Cord Mount: SCM-4 U Bolts
Motor Retention: MR-1
Launch Configuration: 1500 series rail guides
Fin Thickness: 3/8″
Ring Thickness: 1/4″
Instructions: MMAS instructions yes, LOC Custom kit = Advanced users have their own flavor of builds.
Decals: Yes - Door Knob Logo


Customer Reviews

Based on 1 review

I purchased this rocket to use for a small field L2 certification flight, and it was perfect.

The kit is by far the largest I’ve built and the experience was wonderful. The laser cut plywood parts were made from excellent quality wood, and the fit was perfect after sanding just enough to remove the laser burn marks from the edges. This kit appears to be updated some older build threads found on the internet from >5 years ago. This kit includes some really cool features including the MMAS (multiple motor adapter system) and the RNWS (removable nose weight system). The kit includes instructions for these two new features which I needed since I didn’t have experience with anything like this before. The instructions make it very easy to assemble these features on the rocket. Note that the kit includes the mount for a 54mm motor. If flying a different size motor, just by the MMAS adapter for the size you want. The MMAS adapter just slides in the back and is retained with 4 screws. It is very slick and easy to change.

I built mine fairly heavy including lots of epoxy on the fin can (built the fin can outside the rocket then installed it into the airframe) and fiberglassed airframe tubes. I also purchased an extra length of 7.5″ coupler tube to allow doubling the airframe the entire length of the rocket (from upper motor mount ring to nose cone shoulder). Flight weight came in at 17.2 pounds and I hit 741 feet with a J350W. It was plenty of height for a complete recovery system deployment and very clearly visible the whole flight. The included LOC 78″ chute lowered my heavily built rocket onto the field with no damage. I did use a chute release on this chute to delay opening until 500 feet (didn’t have to wait long) and it worked nicely even on this large chute.

I really enjoyed building this kit and highly recommend it if you’re looking for something to use for an L2 cert on a small field.

Why choose us?


LOC Precision provides quality rocket kits and components for every skill level. Your one stop shop for anything rocketry.



Most of my High Power and Mid Power fleet is LOC. I certified all three levels using LOC kits. The quality of the kits & customer service is phenomenal. I would recommend them to everyone.

Peter Waithe
Millbury, MA

I have 16 LOC models love building them and flying them! Jason has turn the company around and made the hobby a lot more fun and really good people. I sincerely thank you LOC

Dennis Jurus
Lancaster, NY

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