RCU Forums - View Single Post - Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Old 08-02-2012 | 02:42 PM
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serious power
 
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From: wexford, IRELAND
Default RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes


ORIGINAL: rgreen24

Anyone out there running a contra on a Spark Evo? I measured my Spark Evo last night and from the bottom of the rudder to the front of the nose appears to be 77'', and I am thinking with the contra spinner length of 85mm, this will put me over 2 meters, any thoughts?
Hi,
The FAI rule is 2M +/- 1%
In practice this means that up to 2020mm is ok.
ie unless your National rule is different.
Most NGB'S set up their rules so that the FAI rule takes precedent where both bodies have rulings.
At WC'S and ICC's models weighing up 5050g and measuring up to 2020mm are passed at processing.

Brian