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Helicopter Duration Info & Plans
Helicopter Duration (HD) information & plans


Helicopter Duration  -  Models for this event use "autorotation" for its recovery system method (no flexible surfaces allowed such as say flex-wing pinwheels).  The models must stay in one piece, not drop any parts. The most popular high performance models use deployable external blades (Rotaroc, Rose-A-Roc, Heli-Roc), or carry a rotor unit inside of the body tube, which is ejected out of the body tube (FAI-style S9 Gyrocopter models, or kits such as Gyro Chaser)

NAR Sporting Code Rules for Helicopter Duration

Helicopter Duration Overview and plans on the NAR website. Read this page first!

How to Build Helicopter Duration Models - From the 2008 NARAM-50 Tips pages. It was focused on B models but most is applicable to models of all sizes. .

Helicopter Duration Model Kits

Helicopter Model kits by Apogee Components - Several kits of varying size, performance, and skill levels. 
      13mm Heli-Roc for 1/2A to A power (1/4A if built LIGHTLY an piston launched). Skill level 4
      Mini-Copter 13mm  for 1/4A to A power, internal blades, skill level 5
      Gyro Chaser 18mm power   Internal blades, skill level 4
      Rotary Revolution  13mm power 1/2A to A powered model. 40mm body meets FAI rules, internal blades. Skill level 4
      Texas Twister  13mm powered model for 1/4A to A power. Sort of like a 3 finned Gyroc, but legal since it does not eject the engine out. More for sport flying,  or a Qualifier / Return model.   Skill level 3

Rose-A-Roc  18mm - Kit by Fliskits.  18mm motor kit version of Art Rose's highly competitive Rose-A-Roc design. External blades fold in half chordwise, reducing boost drag for higher altitude, a bit harder to build well. 

Heli-Roctor KC-02 - 18mm motor size kit by Semroc eRockets. External Blades, similar to a Rotaroc but with a drop-down tail unit.

Flip Flyer  18mm motor size kit by Estes Industries. Easy to build, BUT it ejects the nose section, which would be a DQ (model has to stay in one piece, all parts attached).  Some builder have solved that by adding a shock cord to attach the nose section to the front of the body tube (nose section designed to come off to allow the blades to deploy).  Here is a link to Art Upton's fix, and this link to Bob Sanford's fix. Somewhat heavy, but better than most Qualifier / Return type models

Plans List

Rotaroc Instructions Page - Prototype first flew in 1975, refined thru the years and still a popular design. How-to-build instructions written for a 13mm kit I made for a club build a few years ago, with photos. While showing the 13mm A model, it also applies in general to the 18mm B-C model and similar external rotor "Rotaroc" type models.
Rotaroc Instructions Text - An older set of instructions written before the above  web page was created. Written for the 13mm A Mini-Rotaroc, but also generally useful regardless of size.
Rotaroc 13mm Plans -  Mini-Rotaroc for 1/4A-A power, use the instruction sets above. 
Rotaroc 18mm Plans -  Standard Rotaroc for B -C power, use the instruction sets above. 

More Plans TBA

Terry Lee (Left) & Kevin Kuzcek (Middle) at NARAM-24 in 1982. George Gassaway (right) with F10 powered Rotaroc at NARAM-34 in 1992.

NAR# 18723  -  GeorgesRockets.Com   "Contest flying, Sport flying, it's all good."

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