Estes MiniMarz Lander Flying Model Rocket Kit With Swing Action Landing Gear #1826

The Estes MiniMarz Lander (Kit #1826) is a vintage, classic, futuristic model rocket produced between 1998 and 2002. It was highly praised as a "sleek looking retrorocket" design to simulate an otherworldly planetary exploration vehicle.
The MiniMarz was released as a Ready-to-Fly (RTF) model, coming completely assembled from the factory, making it incredibly popular for rocketeers wanting a unique, thematic design without hours of construction.

Technical Specifications

The MiniMarz Lander is built around smaller 13mm mini-rocket motors, emphasizing low-altitude, highly visible field launches.

Attribute	Specification
Length	9.0 inches (22.9 cm)
Recovery System	12-inch (30 cm) Parachute
Recommended Engines	1/2A3-2T, A3-4T, A10-3T
Maximum Altitude	200 feet (61 meters)
Launch System Requirement	Mini Launch Pad and Controller (with a 1/8" launch rod)

Tips on how hobbyists are modifying MiniMarz to fly on larger engines?

Hobbyists frequently modify the Estes MiniMarz Lander because its factory-stock configuration is relatively underpowered, maxing out at roughly 200 feet on mini 13mm motors. Because it is a Ready-to-Fly (RTF) model made with integrated plastic parts, modifying it requires care to avoid damaging the landing gear or altering the flight stability. 

Rocketeers generally approach this upgrade using two primary methods, depending on whether they want to use longer 13mm engines or step up to standard 18mm power.

Method 1: Extending the 13mm Tube for High-Power Mini Motors

The easiest structural mod preserves the 13mm diameter but accommodates longer, higher-impulse mini motors (like Apogee Components 13mm C6 motors). According to documented builds on RocketReviews, hobbyists achieve this by rebuilding the internal motor core:

• Enlarge the Stock Core: Rocketeers use rolled-up 220-grit sandpaper inside the lower plastic segment to gently sand away the factory-glued internal cardboard motor block and enlarge the opening. 
• Install a Longer Tube: A new 3.25-inch long, 13mm body tube is slid into the cleaned cavity with a new engine block glued near the top. 
• The Benefit: This keeps the external look 100% factory-stock while providing the thrust necessary to send the heavy Lander significantly higher into the air.

Method 2: Boring Out the Mount for 18mm Engines

For maximum altitude, some hobbyists completely bore out the tail assembly to accept standard 18mm "A", "B", or "C" class engines.

• Careful Drilling: Modifiers use a hobby knife or a stepped drill bit to carefully cut through the plastic thrust ring at the base of the lander until an 18mm motor casing can comfortably slide in.
• Adding an 18mm Motor Mount: A short length of standard BT-20 (18mm) body tube is epoxied inside the core to house the new engines securely.

Safety & Stability Considerations

If you scale up the engine power on the MiniMarz Lander, you must adjust the build to keep it stable:

• Add Nose Weight: Skylighter emphasizes that “the total weight of a model rocket engine mount and engine... will determine whether or not it will fly, and if it does, how high it will go.” Adding a larger engine shifts the Center of Gravity (CG) significantly toward the rear. To prevent the rocket from flipping or flying erratically, hobbyists pack modeling clay into the nose cone to shift the CG back forward.
• Tether the Landing Gear: The high aerodynamic force of a "B" or "C" engine can prematurely yank the swing-action landing gear downward during the ascent phase. Hobbyists often use tiny pieces of masking tape or weak dental bands to hold the legs flush against the body until ejection.
• Upgrade the Recovery System: The stock plastic parachute may melt or tear under the increased velocity and forceful ejection charges of larger motors. Swapping it for a lightweight nylon parachute or a specialized streamer prevents a crash landing.

Collectibility Profile

• The "Lander" Legacy: The primary driver for the MiniMarz's collectibility is its lineage. It serves as a miniature, Out-Of-Production (OOP) tribute to the legendary 1969 Estes Mars Lander (K-43). Because original 1969 Mars Landers are incredibly rare and routinely sell for hundreds of dollars, many collectors seek out the MiniMarz as an affordable, space-saving alternative that still features the iconic, functional swing-action landing gear.
• The RTF Paradox: Because the MiniMarz was a Ready-to-Fly (RTF) model rather than a traditional build kit, it is viewed slightly differently by hobby purists. Traditionalists often prefer unassembled balsa-and-cardboard kits. However, because it was an RTF made of pre-assembled plastic parts, surviving units that are completely intact—with unbroken landing gear and undamaged factory detailing—are highly sought after.
• Scarcity: Having been discontinued in the early 2000s, finding one completely pristine in its original packaging has become increasingly difficult.

Approximate collector values (2026):

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