PARA-SAIL CANOPY CONSTRUCTION:
STITCHING:  The para-sail is sewn under the specifications of FED-STD Number 751.  The cross seams, main seams, vent reinforcements, upper lateral band and lower lateral band use a type 301 double needle lock stitch. 

SEAMS:  The cross seams and main seams are joined with seam type LSc-2 (French Fell lap seam) for high strength and securing all raw edges. 

HEMMING:  The vent edges have the fabric hemmed with ½" nylon support tape on the outside.  The upper and lower lateral bands have the 9/16" nylon tape rolled inside the hem for a clean and finished appearance.

BAR TACK REINFORCEMENT:  The 42-stitch automatic bar tack is extensively used to secure stress points on the para-sail.  Wise application of the bar tack includes the attachment of apex lines, securing finger-traps of main lines, securing line attach loops and running ends of main lines.  It is also to secure other stress areas such as the upper and lower portion of all 6 side vents and the left and right ends of all 8 rear vents.

PARA-SAIL HARNESS CONSTRUCTION:
The deluxe padded harness begins with a 6" wide nylon webbing sling reinforced with a single length of Mil-W-27265 1¾" Type 7 nylon webbing, tensile strength of 6,500 pounds, which connects both carbineer hooks. The webbing is double thick from the hooks to the ends of the wide saddle.  At the carbineer hook eye an internal nylon buffer is inserted to reduce wear on the load bearing webbing.
Additionally, the 6" wide sling has two step-in leg straps of 3" nylon webbing. 

The rear support strap connects to the load bearing Type 7 webbing at the end of the saddle stitch pattern. It is padded in the back and continues around to the front as an adjustable chest strap secured with two stainless steel D-rings.
There are three sizes available in the deluxe padded harness, the standard (for the 95 percentile of adults) the XL adult harness (longer leg straps) and the child's harness (downsized throughout to fit a typical 12-14 year old child).

DESIGN PARAMETERS
GENERAL:  Our para-sails have a 16-panel configuration; each panel has four sections (A-B-C-D) totaling 64 individual pieces of material. Additionally each side has a stabilizer with four sections each.  The suspension lines and centerlines connect the para-sail canopy to a riser-yoke webbing configuration, which allows for attachment of the tow rope and harness.

SUSPENSION LINES:  There are 16 individual suspension lines around the perimeter that run from the front and/or rear riser-webbing loops to the lower lateral band line attach loops.  These "line loops" are double thickness Type 1, 9/16" 500 pound tensile nylon webbing and are triple bar tacked to the lower lateral band and main seam of the para-sail.  This makes it very strong from any pull direction and also easy to replace if a line is damaged.

COLOR CODING:  The front most lines (numbers 1 and 16) are color coded in black (for ease of locating the front for proper launch position), the remaining 14 perimeter lines are white.  The two centerlines are color coded in red; they are attached to the risers and hold the apex in proper "inverted" position.  Color coding greatly assists in checking lines for twists or tangles.

ADVANCED APEX / CENTER LINE DESIGN:  The apex lines are attached to every main seam instead of every other seam as in many para-sails. The junction of the apex lines to the centerlines is truly revolutionary in design as it neatly and mechanically assures no side to side shifting whatsoever of 16 apex lines during launch or in use.  It is accomplished by using two metal links that each holds 8 bar-tacked apex lines, which are then locked together with the red centerlines.

PERFORMANCE / TILT ADJUSTMENT:  The six side vents and eight rear vents are directionally billowed to provide stable and efficient lift under tow.  All six of the side vents can be equally adjusted from full open to full closed (in the center) to regulate airflow in general.  Fully closed provides more lift, full open provides more stability.  Additionally, they can be offset from side to side for correcting any tilt the para-sail may develop over use.

GUST / STABILITY CONTROL:  The apex hole is designed excessively large to help vent the para-sail when needed to combat oscillating from side to side in and "over-tow" situations (gust of wind and/or winching too fast).  Note that extreme wind conditions may still cause oscillations.