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S4 (Rocket Glide) Introduction
#1
Yes it is true that the top of this part of the forum shows S4 as Boost Glide, but to NAR competitors, this is Rocket Glide.  The FAI rules do not allow any dropping of parts or jettisoning of expended motor casings.  What goes up together must all come down together as one unit in stable gliding flight.  This event is usually flown as S4A, meaning the total impulse of the motor is limited to 2.5 Ns.  This is flown by both Juniors and Seniors at FAI competitions.  The FAI rules do not allow for radio controlled models in this class.  The model must be flown free flight.  However, a single function radio controlled dethermalizer is allowed (unlike NAR free flight competition).

Follow this link to the NAR website for information on S4: S4 – Boost Glider
Terrill Willard
Phoenix, Arizona
NAR 55192
USA 775089
Reply
#2
I took some photos of S4A models at the World Championship held in Bulgaria in 2014. 

The first photo is of a Czech model found while on deep recovery for the S5 event.  Steve Foster and I were driving his rental car through the fields hunting for models and listening for US team launches on the FRS radio.  We found a few gliders that day.
ImageIMG_2116 by T-rex in AZ, on Flickr

Here is a photo of Steve Foster with one of his S4A birds.  This is very similar to what US competitors see in NAR competition.
ImageDSC_0094 by T-rex in AZ, on Flickr

Leszek Matmyga of Poland with two very nice S4A models.  These are typical of the dominant design.  Known as "swing-floppers" by Americans, the wing first swings 90-degrees and then the wing tips flop open at deployment.

ImageImageIMG_2036 by T-rex in AZ, on Flickr

Spanish Catalonian team captain Jordi Font presides over a trimming session before his team heads off to compete in S4.  These models were trimmed so nicely that they had a slow floating glide with a steady wide turning circle.  Truly a beautiful sight to see in the clear early morning sky.
ImageIMG_2039 by T-rex in AZ, on Flickr
Terrill Willard
Phoenix, Arizona
NAR 55192
USA 775089
Reply


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