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<b>NEW</b> Doorknob <br/> BIG Scale Cluster 1<b>NEW</b> Doorknob <br/> BIG Scale Cluster 2
Model Rocket Shop Special - this Estes kit is sold with a Klima 5 way cluster motor mount but can be flown as it comes, given motor availabilty

Vital Statistics

Diameter: 76mm
Length: 683mm
Weight: 283.5g
Recovery: 45.7cm Nylon Parachute
Recovery Upgrade: Firewall Parachute Protector and/or 75mm Baffle
Launch equipment: Klima Air Launcher, 6mm rod, see below
Recommended Motor F15-4, F15-6, E16-4 w/Adapter (sold separately)- D12-3 OR 5-way 18mm Cluster of Cs or Ds
Projected Altitude: 1100 Feet

Because of the impossibility of selling Estes E and F motors in the UK and the current lack of Aerotech or Cesaroni equivalents, we are bundling a Klima 75mm 5-way cluster mount for 18mm motors. This can be used with Estes or Klima C6-5 motors or Klima's superior D9-5s. While Estes maintains that this rocket can fly on D12-3s using an 24 > 29mm adapter, our sense of caution recommends otherwise.

Updating this model rocket kit to cluster propulsion is dead easy. A couple of laps of masking tape around the motor mount bulkheads and/or optional baffle makes this modification as simple as they come. 5 minute epoxy recommended for strength and rapid assembly. You can fly with 4 or 5 x C motors or 4 or 5 D9 motors or mix and match symmetrically.

A bit of history

During the mid-1950's, the public concerns over nuclear fallout due to US and Russian testing was reaching a fevered pitch. To that end, President Eisenhower announced to the US on August 22, 1958, the US would ban further nuclear testing on or before October 31 of the same year. US scientists, wanting to gather as much data as possible, responded with Hardtack Series of tests. Scientists where interested in many scientific areas, but primary interest lay in the effects of radioactivity from underwater and above ground detonation. The Hardtack Nuclear Testing Program consisted of 35 detonations in the Pacific Proving Grounds during the period of April-August 1958. Scientists, at the time, were chiefly concerned about damage to the ozone layer and possible effects of long-range radioactive fallout and determined that scientific measurements of the earth's upper atmosphere (aeronomy) would help clarify what, if any, damage had occurred.

Single and two stage Doorknob rockets were developed using Lacrosse and Thiokol solid propellent motors and could launch an instrument laden sounding rocket to approximately 50 miles in altitude and capture radioactive data for analysis. Early results of this upper atmosphere data suggested little to no damage to the ozone layer was measured during the nuclear testing and water detonations probably produced enough ozone to replace what little might have been lost due to above ground testing.

The Estes 1:12 scale and sport model is big and impressive. Simple to build and fun to fly, this kit has two sets of decals available for those who want to turn this scale model into a sports model.


WHAT YOU NEED TO BUILD: Scissors, pencil, ruler, fine sandpaper, epoxy, carpenter's glue, sanding block, hobby knife, masking tape, primer (white), paint (black, day glow orange, white) and clear coat (optional). Tools, construction and finishing supplies not included.

WHAT YOU NEED TO LAUNCH (sold separately): Porta-Pad E Launch Pad and Pro Series II Launch Controller, Estes model rocket engines, starters and recovery wadding. Six C 1.5V high quality AA alkaline batteries are also required for launch controller (not included).

OUR LAUNCH RECOMMENDATION (sold separately): The Klima Air Launcher with a 6mm rod is more than adequate for this medium power rocket. Igniting a cluster reliably needs Tape Match and Igniter Sticks. An Estes E Launch Controller has more than adequate wire length for safety. A Nomex Parachute Protector and/or 75mm Ejection Baffle enhances recovery reliability

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