D-Cel Harness Instructions

Drill and Attach Helmet Hooks

Lacing Hardware

Fitting Device to Occupant

Some of the factors that can influence the harness fit are:

D-Cel Size Chart

Disclaimer


Drill and attach helmet hooks
• Locate helmet hooks symmetrically on both sides of the helmet.
• The double helmet hook front attachment is located in front and below the helmet chin strap rivet by 1-1.5".
• Drill and attach the forward screw of the double hook first per Diagram B.
• The Double Hook Attachment kits contains 4 (1/2”) 10-32 screws, 4 washers, 4 nut-washers and two double cables.
• The nut washer has been designed to be friendly to the inside of the helmet. 2-(1/8”) holes have been provided in the nut washer to use for holding it secure while the screw is being tightened. Any 1/8” rod or 90 degree snap ring pliers will hold the nut washer in place. Use a medium strength thread locker on the threads of the nut washer.
• Tighten the helmet hook assembly until snug against the helmet. Over tightening is not nessessary and may damage the helmet shell.
• Once the front helmet hook is drilled and the screw assembly is attached to the helmet per diagram (3B), rotate the cable to the rear of the helmet and drill and attach the rear hook. The hole should be located at least 3/4” above the bottom rim of the helmet.
This should put the top (uncovered) cable even with the bottom of the helmet.
• Both hook locations should be positioned to clear the "bead" liner in the helmet.


Lacing Hardware
Lace the helmet tethers provided, to the upper D-rings on the upper back of the harness. (Make sure to lace the excess tether material through the 3-bar provided on the tethers. This will reduce the amount of slippage through the D-rings.)

Attach the shorter tether to the front 3-bar on the upper chest of the harness. The quick release tether should be pointed down. SeeFigure E.
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Fitting Device to Occupant


Check the "Sizing Chart" provided on the back page of the instruction manual to get the appropriate size harness.

1) Grab harness by the body and lay the leg straps on the ground by your feet. Step into the leg straps and pull harness up the legs to the pelvis.

2) Insert arms under the shoulder harness and drape the crossed back strap over the shoulders. The crossed straps should be located in the center of the back.

3) The Back Label should be approx. 2" below the base of the neck before the harness is adjusted. This 2" gap will allow for proper adjustment of the red helmet tethers.

4) Adjust the rear 1" cross strap so that it will keep the side crosses located when the occupant sits.

The crosses should be located toward the center back of the occupant by 2-3" from the center of the side.

5) Adjust the 3-bar adjusters around the legs snuggly.

6) Adjust the chest strap so that the upper chest straps are aligned vertically on the chest.

7) Get into car.

8) Pull down on shoulder straps on the harness. This will raise the rear d-rings The front D-rings should be positioned in front of the collar bone when the harness is tightened.

- The harness may be too small if the front D-rings are on or above the collar bone.

9) SEAT the harness by pulling up on the back helmet tethers to take out the slack in the lower portion of the harness before adjusting the helmet tethers.
Tension should be felt all the way from the pelvis to the top of the harness. The harness should be “SEATED” every time the harness is used.

10) Pull Quick release hook bail to release. Attach quick release hook to double helmet hook and secure bail. Position the shoulder harness to OUTSIDE of vertical straps and the helmet tethers. The helmet tethers need to be on the inside of the shoulder belt harnesses to provide a straight load path and to insure the harness does not get caught up in the shoulder belts in case a quick egress is needed. See Diagram IB.
The Quick release tether should be pointed down toward occupant for the release mechanism to work properly.See Diagram I.

11. Adjustment of the helmet tethers is critical to the proper function of the harness. The highest neck tension occurs very early in an accident. Therefore: the initial tension on the harness is directly related to the effectiveness of the system.

Adjust the rear (red) tether first.

The harness should be adjusted to allow a MAXIMUM of 1” FORWARD movement before tension is felt in the harness system. This should allow approximately 30 degrees of side to side movement. (extra mirrors, where allowed, are a good idea to help eliminate blind spots.)

(See Fitting Device to Occupant - Page 3)

Adjust the forward helmet tether so that it restricts side movement of the helmet.

12. Each time the harness is worn, check to insure all latches are secure. “SEAT” the harness, by pulling up on the helmet tethers before attaching the quick release to the helmet. This will take out unwanted slack in the system.

Minor adjustments may be necessary to properly tension the harness each time the system is worn.

Some of the factors that can influence the harness fit are:

12a) Driving suit fit – a loose fitting driving suit will allow the harness to better fit the occupant. It will also allow the fire suit to increase it’s effectiveness in a fire by providing air gaps.

12b) The seat and seat belt tension can also change the routing distance and thus require harness adjustment.
SAFETY SYSTEM

A Safety Solutions head and neck restraint, Huchens Device, is only one part of a good safety system for any race car. It is very important to make sure all of your safety equipment is in top shape and interacts well with the other components of your safety system.

A D-cel Harness has been shown to be most effective in a system with properly mounted seat belts and a 6-point sub-belt system. The 6-point has been shown to better control the occupant’s pelvis earlier in the event. By securing the pelvis earlier in the event, the upper torso and head loads will be reduced.

A rib support seat with shoulders and a quality head rest has also shown to be beneficial to the effectiveness of the harness system. The seat should be securely mounted and have a ramp-up to the front of the seat to help reduce the occupant motion in a frontal or angular frontal impact. The rib support seat will help slow down the upper torso and cause the body to curl around it. This motion will increase tension on the vertical straps of the harness.

A quality headrest and nets will help the occupant stay inside of the safety system and will help guide the head during the event. Contact with the steering wheel in a stock car is very likely. For this reason, a wheel with thin or relieved spokes and a column that can stroke can help control the head motion in an impact. This is the same principal that is used in your passenger car.

Head and neck restraint devices are most effective in angular frontal and frontal crashes. They become less effective in side and rear impacts. The occupant needs to rely on the other parts of the safety system in these types of impacts. The seat and headrest is the main restraint in side and rearward impacts.
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DISCLAIMER

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