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Coota Class Nostalgia

Why ‘Coota’ class?  Because ideas for the class were sorted out and tested at a couple of AEFA events held at Cootamundra.

Concepts for the class come from a couple of existing competitions.  At Old Timer meetings a regular feature is the Gordon Burford Event.  Its a limited engine run event where models must be powered with a diesel engine manufactured by Gordon Burford. Popular models come from the Nostalgia era, ie aircraft which were designed, kitted or published on or after 1st January 1943 and on or before 31st December 1956. In effect it rules any airframe, but with a nominated power system.

That idea also applies in the Electric Formula One (EF1) format.  It’s a pylon racing event for electric powered models where all power system components (motor, ESC, prop and battery) are specified.  The aim is to create a level playing field by nominating components that are readily available at reasonable prices. 

So the Coota class builds on the concept of a standard power system with a some freedom to select the airframe.  Because EOT Duration, Height Limited and Texaco events don’t allow Nostalgia period models, the Coota class caters specifically for them.

Because the class is still evolving its premature to construct detailed regulations but the following areas take ideas from Burford and EF-1 to form the framework for the provisional rules:

  • A Nostaglia period model
  • A target flight time of 7 minutes, based on a single continuous motor run, to a height of about 200m (~600 ‘)
  • A reasonably priced outrunner motor, with adequate power to reach the target ceiling using a common propeller
  • Power components to weight no more than 170g
  • Adequate battery capacity to allow two back to back heats without battery change

 Based on these ideas the following can be considered as provisional rules.

NOSTALGIA Coota Class

DESCRIPTION:  This is a limited motor run event for nostalgia period model aircraft.

Model eligibility

This event is open to all nostalgia aircraft as described in MAAA and AEFA Old Timer rules.  Models are not to be scaled.  Maximum wing span is 57”.  Pylon and propeller face locations are to be in accordance with the published plans.

Motor system eligibility

Any outrunner motor with RPM/volt between 1300Kv and 1350Kv. Maximum weight of motor and battery is not to exceed 170gm.

(Note: Turnigy Park 480 1320kv is suitable)

Battery

Battery is not exceed three LiPo cells with a max capacity of 1050mAh.

(Note: Any 3S LiPo under 1050mAh is allowed)

Electronic Speed Control

ESCs are unrestricted and can include BEC function.

(Note:  Current rating should be between 20 to 30 amps) 

Propeller

The propeller is to be a commercially available 8” x 4” electric.

(Note: 8x4 APC-E or close equivalent is required.)

Motor run times

Motor Run is a single continuous run not exceeding 25 seconds.

Flight procedures

The maximum flight time is seven minutes

Hand launching of Nostalgia models is permitted.

Two back-to-back heats may be required by the Contest Director

 

Coota Class Candidates

The following are examples of models that meet the provisional rules with links to one source of plans.

Dixielander

dixilander

 http://www.outerzone.co.uk/plan_details.asp?ID=3603

The Stomper

 stomper

http://www.nswffs.com.au/stomplan.gif

 

Zoot Suit

 

 zs 

 

http://www.outerzone.co.uk/plan_details.asp?ID=1596

If you want to experiment, look at the following setup. It has been tried on a Zoot Suit nostalgia model weighing 20 oz AUW.

The model climbed to just over 200m in 20 sec.

Motor: Turnigy Park 480, 1320Kv, wt=80g, diameter 36mm,

Battery: Turnigy 3S-850 45C Nano LiPo, wt=73g,

Motor+battery=153g

ESC: 30A Turnigy Plush with BEC function, wt=25g,

Prop: 8” x 4” APC-E, wt=12g,

Motor mount + 4mm Prop driver, wt=12g,

Total power system weight=202g (7.1 Oz, ~35% of model mass)

Expect around 20A current draw at full throttle

 

 

 

 

 

 

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