Airplanes and Rockets' history & copyright Google search American Modeler Air Trails American Aircraft Modeler Young Men Hobbies Aviation Flying Aces Saturday Evening Post Boys' Life Hobby Distributors Amateur Astronomy Engines & Motors Balsa Densities Silkspan Covering Comics Electronics My Models Model Aircraft Articles Plans Model Boat Articles Plans Model Car Articles Plans Model Train Articles Plans 1941 Crosley 03CB Radio Model helicopter articles & plans Crosswords Model Rocket Articles Plans Restoration Projects Photos Peanuts Collection Model Aircraft Articles Plans Sitemap Homepage Hints and Kinks Amateur Radio Archives of the homepage R/C Modeler Electronics About Airpleans and Rockest, Disclaimer, Terms of Use Model Topics Please Donate to Airplanes and Rockets Parole Plaza, Annapolis, Maryland Hobby Items for Sale Airplanes and Rockets Hero Graphic
Model Aircraft Museum, AMA - Airplanes and Rockets

Academy of Model Aeronautics Government Advocacy Coalition - Airplanes and Rockets

Estes Cobra 3-Engine Cluster Rocket

Estes 1971 Model Rocketry Catalog - Pages 24 & 25 - Airplanes and RocketsMy first (and only, for that matter) cluster type model rocket was the Estes Cobra. It uses a cluster of three motors. It is a rather unattractive model, and uses four very large fins, most likely to help assure a controlled flight in the event that one or two of the motors misfire. A big concern with cluster models is that either a motor will fail to ignite or that one will ignite much later than the others.

To the right are pages 24 and 25 out of the 1971 edition of the 1971 Estes Model Rocketry Catalog that featured the Cobra, Cherokee-D, and Ranger models.

 

Specifications:            Cobra Building Instructions

Price = $3.00

Length = 22.25" (56.5 cm)

Body Diameter = 1.637" (41.6 mm)

Weight = 2.5 oz (71 grams)

The first launch of my Estes Cobra model rocket was with three A8-3 motors. The flight went perfectly, and I was thrilled. I think the second flight used three B6-4 engines, and I recall that the time delay was not long enough because the Cobra was still travelling upward at a pretty good clip when the parachute deployed and a couple of the shroud lines ripped out. The Cobra landed without damage, even with a crippled recovery system.

 

Estes Cobra kit - Airplanes and Rockets         Estes Cobra kit - Airplanes and Rockets

Espresso Engineering Workbook
RF Cascade Workbook 2018 by RF Cafe

Cafe Press

Academy of Model Aeronautics (AMA) - Airplanes and Rockets

Academy of Model Aeronautics

Tower Hobbies logo - Airplanes and Rockets

Tower Hobbies

Horizon Hobby logo - Airplanes and Rockets

Horizon Hobby

Sig Manufacturing - Airplanes and Rockets

Sig Mfg

Brodak Manufacturing - Airplanes and Rockets

Brodak Mfg