BRS-6 General Installation Guide - CAFE Foundation

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For heavier (and wooden or composite) ultralights, multiple attachment points are preferred to help distribute the loads and allow for a proper descent attitude. Two shorter harnesses attached to opposite ends of the “root” tube is common. Other recommended locations may include gear legs, longerons, firewalls, engine mounts, spar carry-thrus, and/or cabanes. The multiple harnesses should converge to a point that is usually 4-8 ft. above the aircraft and directly overhead of the CG, with the aircraft in the desired touchdown attitude. They are coupled together with a large, stainless steel quick link and joined to the parachute riser with a single, main bridle and another quick link. At least (3) or (4) separate attachment points are recommended for wooden or composite ultralights as there is commonly no single “strong” structural member. In some cases, a “basket” or “hammock” of webbing is made to sling underneath a wooden fuselage to minimize destruction at the time of deployment. For composite frames, adding structural hard points using steel or aluminum will most likely be necessary to handle the loads in the aft and upward direction. Reinforcement with additional compression and/or tension members or additional plies of fiberglass or wood may be needed. A few things to consider when designing your harness configuration: A. Aircraft Dynamics at Deployment The proper location of the multiple harness attachments can actually help reduce the loads that a parachute may apply to the airframe, and even help reduce the loads on the canopy itself. By attaching the front harness(es) to points above and forward of the aircraft CG, an inflating parachute will tend to pitch the aircraft nose up (Figures 12-14), thereby presenting the bottom of the aircraft to the relative wind (due to the CG alignment characteristic described earlier). This creates a condition similar to an accelerated stall and immediately slows the forward speed of the aircraft. A slower aircraft speed at the point of full inflation equates to lower loads on the canopy and translates to lower loads on the airframe. The rear harness(es) will act to limit the degree of the stall and also keep the tail positioned correctly for touchdown. All Kevlar® only!! Figure 12: Deployment, Reefed (with recommended attachments) BRS-6 General Installation Guide (Models 600 through 1800) Page 30 of 47 BRS Document № 020001-03 Revision D Copyright © 2008, BRS Inc.
Figure 13: Inflation, Disreef (with recommended attachments) Figure 14: Descent (with recommended attachments) BRS-6 General Installation Guide (Models 600 through 1800) Page 31 of 47 BRS Document № 020001-03 Revision D Copyright © 2008, BRS Inc.
Page 1 and 2: D C B A 6 5 Notes: 1. Part number 0
Page 3 and 4: This guide complies with applicable
Page 5 and 6: Introduction TABLE OF CONTENTS BRS
Page 7 and 8: INTRODUCTION Thank you for consider
Page 9 and 10: BRS SYSTEM BASICS The following dis
Page 11 and 12: With a few minor exceptions, all of
Page 13 and 14: Motor Case Forward Bulkhead Motor C
Page 15 and 16: Once ignited, the grains will burn
Page 17 and 18: 5. The Bridles and Harnesses Bridle
Page 19 and 20: INSTALLATION GUIDE BRS has helped e
Page 21 and 22: Models 600, 800, and 1050 Model 135
Page 23 and 24: SYSTEM MOUNTING Mounting your BRS p
Page 25 and 26: If you are unsure of the strength r
Page 27 and 28: 6. Egress BRS rockets have incredib
Page 29 and 30: PARACHUTE ATTACHMENT 1. Ultimate Lo
Page 31: When designing the harness assembly
Page 35 and 36: Figure 17: Inflation, Disreef (w/ i
Page 37 and 38: low attitude were somewhat unstable
Page 39 and 40: you feel you have been supplied the
Page 41 and 42: ACTIVATION HANDLE MOUNTING As with
Page 43 and 44: FINAL NOTES In addition to this man
Page 45 and 46: ROCKET 600 800 Solid Fuel Rocket Mi
Page 47 and 48: CUSTOMER LOADS DETERMINATION WORKSH
Page 49: Ballistic Recovery Systems 300 Airp

BRS-6 General Installation Guide - CAFE Foundation

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