Next Previous

True Stop Bobbins

Bobbin rope pathBobbins are mechanical descenders where the rope path follows the S-shaped path shown in the figure. In general the braking surface consists of two non-rotating bollards fixed to a sideplate, with a second pivoting sideplate provided to keep the rope from jumping off the other end of the bollards. A third (usually smaller) bollard may be provided. The seat maillon usually attaches to holes in extensions of the two sideplates; these holes are aligned when the sideplates pivot to the closed position.

I distinguish true bobbins from false bobbins by whether the spools (or bollards) move with respect to the frame. On true bobbins the center of the spools is fixed although the spools may rotate (on stop bobbins, the lower one usually does). On false bobbins, the center of the spools can move. I don't believe that there is necessarily any advantage of true bobbins over false bobbins or vice versa, it's merely a means of classification. Stop bobbins have a mechanism that applies additional braking force if the rappeller releases or squeezes (depending on the design) a handle on the bobbin. Sometimes the additional friction is enough to stop the rappeller, which possibly transforms the resulting injury from impact trauma to harness suspension trauma.

I find that the Petzl Stop is more likely to stop me than the Diablo, Dressler or Kong - in fact, on a clean rope, I can often rappel with these locked off. The Petzl I'D is a complex device that I've included here after trying it and seeing that the rope follows a bobbin "S" instead of the odd path shown in the instructions. The Tracson is another complex device that I've included here rather than create a new category. It combines a Jumar-type cam with a bobbin into a single rappel and ascent device. I would not like to rely on the stop feature because of the sharp cam teeth. My Tracson bent each of the first two times I tested it, so I haven't used it since. Its an interesting idea, but I think it needs more work to be practical.

Image

ID Device Description Acquired Weight Height Width Thickness Std. volume
Asol 2484 Asol Bent frame, solid spools, cut lower spool, top brake linked to handle, plastic gate  Liao Kangin, 2018 375 227 59 31 404
Beal (ISC) D4 1494 Beal (ISC) D4 Al frame, SS spools, rotating handle Expé-Spelemat, 2016 681 197 82 78 1268
Венто (Vento) 2468 Венто (Vento) Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, stamped gate Alexander Starkov, 2017 317 211 56 30 354
BO.VE Diablo 431 BO.VE Diablo Bent frame, solid spools, round brake, no-stop lock, stamped gate Repetto Sport, 1982 327 223 63 32 450
Camnal Down 2528 Camnal Down Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Duoqiao Technology (sporting_mall), 2019 352 232 63 31 452
Camp Giant 2543 Camp Giant Forged Al front & rear plates, irregular lower bollard, control handle Rock N Rescue, 2019 546 187 92 42 730
Mikhail Dyakin 451 Cascade
(Каскад)
Bent frame, solid upper spool (cut), solid lower spool /w round stop, aux. rod, wire gate Vladimir Kisseljov and Ilia Alexandrov, 1994 246 222 55 32 391
Chinese, Version A 2543 Chinese, Version A Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Strade FarEast Ltd. (3cdeal_sfc), 2021 342 218 61 33 431
Chinese, Version B 3068 Chinese, Version B Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  hea1985, 2021 349 233 63 31 456
Climb Tech 1383
2435
Climb Tech Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate
  • Climb Tech, 2012
  • Bob Thrun Collection, 2017
342 219 60 33 433
Climbing Technology Sparrow 1432 Climbing Technology Sparrow Irregular bollard /w handle & integral clutch, swinging face plate Lior Porian, 2015 524 181 86 53 816
Climbing Technology Sparrow 200 1479 Climbing Technology Sparrow 200 Irregular bollard /w handle & integral clutch, swinging face plate Inner Mountain Outfitters, 2016 548 180 85 53 812
Dressler DAD 432 Dressler DAD Bent frame, irregular cast spools, open top Repetto Sport, 1982 247 179 51 32 292
Epic Peak 2464 Epic Peak Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Epic Peak, 2017 343 219 64 32 446
Fiolent (Фиолент) 3053 Fiolent (Фиолент) Bent frame, solid upper (cut) & lower (/w steel brake) spools, stamped gate Denis Pivot, 2021 278 244 69 29 485
Great Makings 1418 Good Makings Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Yungfeng Xiao, 2014 342 217 64 32 445
heightec Prism D31 1496 heightec Prism D31 Stamped frame, solid pivoting upper spool (cut), cast hollow lower spool, stop on handle lever extension, aux. anvil, plastic gate American Alpine Club Store, 2017 510 239 78 31 570
heightec-PMI Powerlock 1168 heightec-PMI Powerlock SS Frame, Al spring-loaded upper spool, cast SS lower spool on handle /w red plastic grip On Rope 1, 2008 737 162 184 30 878
heightec-PMI Quadra 1169 heightec-PMI Quadra SS frame /w openings, Al upper spool, cast SS lower spool on spring-loaded plate /w spring/loaded Al handle On Rope 1, 2008 692 185 92 30 507
ISC A•B 1431 ISC A•B Bent frame, solid upper spool, solid lower spool (cut), spring-loadedlever /w folding handle & round stop, stamped gate Jon Edelman, 2015 454 206 65 35 468
ISC D2 Escape Descender 1398 International Safety Components (ISC) D2 Escape Descender Closed Al frame, cast spools, rotating handle, for 7-8 mm rope Rescue Technology, 2013 290 143 70 61 603
ISC D5 RP885 3038 International Safety Components (ISC) D5 RP885 Closed Al frame, cast spools, rotating handle, for 12.5-13 mm rope Paul A. Wood, 2021 769 193 97 76 1411
Ito-Rocky 2530 Ito-Rocky Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Andy Garcia, 2019 372 224 59 30 403
Kong, Version A 1434 Kong, Version A Bent frame, solid spools, cut lower spool, top brake linked to handle, stamped gate  Clear Out Our Stuff, 2015 398 232 55 27 342
Kong, Version B 522 Kong, Version B Bent frame, solid spools, cut lower spool, top brake linked to handle, stamped gate Inner Mountain Outfitters, 1996 397 230 65 32 478
Kong, Version B (modified) 528 Kong, Version B (modified) Bent frame, solid spools, cut lower spool reversed, top brake linked to handle, stamped gate Inner Mountain Outfitters, 1997 397 230 65 32 478
Kong Indy 903
2436
Kong Indy Bent frame, solid spools, cut lower spool reversed, top brake linked to handle, stamped gate
  • Inner Mountain Outfitters, 2001
  • Bob Thrun Collection, 2017
476 230 64 31 456
Kong Indy EVO NFPA 1395 Kong Indy EVO NFPA Bent frame, cast ribbed spools, top brake linked to handle  On Rope 1, 2013 455 216 62 33 444
Kong Indy EVO NFPA 3069 Kong Indy Evo Plus Bent frame, cast ribbed spools, top brake linked to folding handle  TradeInn / Amazon.com, 2021 491 201 57 44 503
Kong Pirata 2553 Kong Pirata Stamped frame, cast Al spools,spring-loaded plastic handle, stamped gate Karst Sports, 2020 421 177 61 40 436
Kong-Bonaiti, Version A 3024 Kong-Bonaiti, Version A Bent frame pivots at top bar, solid spools, cut lower spool, top brake linked to handle, stamped gate  Avi Basri, 2021 399 239 60 31 446
Kong-Bonaiti, Version B 433 Kong-Bonaiti, Version B Bent frame pivots at top bar, solid spools, cut lower spool, top brake linked to handle, stamped gate Speleoshoppe, 1982 400 239 60 30 430
Krok Anti-Panic Aluminum, Version A 1342 Krok Anti-Panic Aluminum, Version A Bent frame, solid spools, high handle, push-button twist catch, no gate, painted Gear4Rocks, 2012 345 195 120 33 780
Krok Anti-Panic Aluminum, Version B 1361 Krok Anti-Panic Aluminum, Version B Bent frame, solid spools, high handle, push-button twist catch, no gate, painted Krok (Alex Dniprovsky & Alex Kostromitinov), 2012 408 208 118 33 816
Krok Anti-Panic Steel 1343 Krok Anti-Panic Steel Bent frame, solid spools, high handle Gear4Rocks, 2012 528 194 121 29 689
Krok Desant 1344 Krok Desant Bent frame, solid spools Gear4Rocks, 2012 373 184 84 26 403
Krok Desant Classic 1392 Krok Desant Classic Bent frame, solid spools (cut), aux. rod, wire gate Gear4Rocks, 2013 410 196 118 29 666
Krok Grisha, Version A 1345 Krok Grisha, Version A Stamped frame, milled cam on spring-loaded handle, single rope Gear4Rocks, 2012 399 156 84 31 402
Krok Grisha, Version B 1357
1362
Krok Grisha, Version B Stamped frame, milled cam on spring-loaded handle, single rope
  • Gear4Rocks, 2012
  • Krok (Alex Dniprovsky & Alex Kostromitinov), 2012
402 135 109 36 526
Krok One-armed Amigo 3016 Krok One-armed Amigo
6061.36
(Однорукий Амиго)
Stamped frame, milled bollards, rotating arm with rope channel, brake handle on arm Krok, 2021 471 161 108 27 474
Krok Stopor-Desant 1352 Krok Stopor-Desant Bent frame, solid spools, high handle Gear4Rocks, 2012 476 150 121 31 560
NTR 1454 NTR Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Linko Chen, 2015 343 218 62 32 436
NTR 2595 Orion-Alp (Орион-Альп) Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, stamped gate Artyom Babin (Артём Бабин), 2020 352 216 59 32 408
Petzl I'D. Large, Version A 565
2432
Petzl I'D. Large, Version A Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate
  • Inner Mountain Outfitters, 2000
  • Bob Thrun Collection, 2017
526 194 83 54 870
Petzl I'D. Large, Version B 1166 Petzl I'D. Large, Version B Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate Rescue Response Gear Inc., 2008 525 203 79 52 840
Petzl I'D. Large, Version C 1218 Petzl I'D. Large, Version C Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate, horizontal mode button On Rope 1, 2009 550 212 80 54 912
Petzl I'D. Large, Version D 2524 Petzl I'D. Large, Version D Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate On Rope 1, 2019 588 200 83 56 933
Petzl I'D. Large, Version D 2592
+2587
Petzl I'D. Large, Version D with additional closed brake Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate /w closed brake added
  • I'D: Lisa Seifert, 2021
  • Brake: KS Rescue, 2021
608 205 81 71 1188
Petzl I'D. Large, Version D 2589
+2588
Petzl I'D. Large, Version D with additional open brake Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate /w open brake added
  • I'D: Mo Money Pawn, 2021
  • Brake: Gear Express, 2021
611 205 81 73 1199
Petzl I'D, Small, Version A 556
2433
Petzl I'D, Small, Version A Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate
  • Inner Mountain Outfitters, 1999
  • Bob Thrun Collection, 2017
536 194 83 54 870
Petzl I'D, Small, Version B 1219 Petzl I'D, Small, Version B Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate, horizontal mode button On Rope 1, 2009 558 212 80 54 912
Petzl I'D, Small, Version C 2523 Petzl I'D, Small, Version C Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate On Rope 1, 2019 593 202 82 59 972
Petzl I'D, Small, Version C 2565
+2548
Petzl I'D, Small, Version C with additional closed brake Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate /w closed brake added
  • I'D: Nicholas Harris, 2020
  • Brake: Rock N Rescue, 2019
616 202 82 72 1200
Petzl I'D, Small, Version C 2569
+2542
Petzl I'D, Small, Version C with additional open brake Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate /w open brake added
  • I'D: Angie Beck, 2020
  • Brake: Amazon.com, 2019
617 202 82 73 1207
Petzl I'D Evac 2525 Petzl I'D Evac Irregular bollard /w handle & integral clutch, anti-error catch, swinging face plate /w hook The Safe Path - Amazon.com, 2019 616 203 83 73 1221
Petzl Rig, Version A 1247 Petzl Rig, Version A Irregular bollard /w handle & integral clutch, swinging face plate On Rope 1, 2010 379 177 67 58 679
Petzl Rig, Version B 2522 Petzl Rig, Version B Irregular bollard /w handle & integral clutch, swinging face plate On Rope 1, 2019 402 179 70 54 673
Petzl Stop, Version A 435 Petzl Stop, Version A Bent frame, solid upper (cut) & lower (/w steel brake) spools, stamped gate Repetto Sport, 1982 289 225 61 33 453
Petzl Stop, Version B 436 Petzl Stop, Version B Bent frame, solid upper (cut) & lower (/w steel brake) spools, stamped gate Caves Unlimited, 1984 302 226 64 32 463
Petzl Stop, Version C 1324 Petzl Stop, Version C Bent frame, solid upper (cut) & lower (/w steel brake) spools, stamped gate Geoffrey Storey, 2012 297 231 63 32 463
Petzl Stop, Version D 2420 Petzl Stop, Version D Bent frame, solid upper (cut) & lower (/w steel brake) spools, stamped gate Bob Thrun Collection, 2017 309 229 62 32 458
Petzl Stop, Version E 437 Petzl Stop, Version E Stamped frame, solid upper spool (cut), cast lower spool /w stop, aux. rod, stamped gate John E. Weinel, Inc., ~1987 327 240 63 32 484
Petzl Stop, Version F 2586 Petzl Stop, Version F Stamped frame, solid upper spool (cut), cast lower spool /w stop, aux. rod, stamped gate Seth Parks, 2021 325 225 61 32 443
Petzl Stop, Version G 438
3020
Petzl Stop, Version G Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, stamped gate
  • Bob & Bob, 1991
  • Avi Basri, 2021
322 225 62 32 446
Petzl Stop, Version H 541 Petzl Stop, Version H Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate TSA, 1997 325 223 68 32 485
Petzl Stop, Version H 3026 Petzl Stop, Version I Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Joe Nicely, 2021 323 223 68 32 484
Petzl Stop, Version J 2526 Petzl Stop, Version J Stamped frame, cast SS spools, aux. rod, spring-loaded plastic handle, plastic gate Petzl America, 2019 348 200 70 38 533
Rock Empire 1368 Rock Empire Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Climbing Terekpl, 2012 341 220 59 32 418
Russian, Version A 518 Russian, Version A Bent frame, solid upper spool (cut), solid lower, stamped gate Theresa Williams/Maury Benamy, 1995 255 220 62 27 368
Russian, Version B 973 Russian, Version B Bent frame, solid upper spool (cut), solid lower, aux. rod, stamped gate Ural Sport, 2004 286 208 74 30 459
SAR Scarab, Version A 1013 SAR Scarab, Version A Bent frame, solid upper spool, solid lower spool (cut), lever /w round stop, stamped gate SAR, 2006 436 195 62 35 419
SAR Scarab, Version B 1029 SAR Scarab, Version B Bent frame, solid upper spool, solid lower spool (cut), lever /w round stop, stamped gate SAR, 2007 430 195 62 35 419
SAR SARAB 1211 SAR SARAB Bent frame, solid upper spool, solid lower spool (cut), spring-loaded lever /w folding handle & round stop, stamped gate SAR, 2009 470 206 65 35 472
S.A.R.L. Voynett Tracson 452 S.A.R.L. Voynett Tracson, Version A Combination bobbin and ascender Repetto Sport, 1982 580 192 107 50 1027
S.A.R.L. Voynett Tracson 2409 S.A.R.L. Voynett Tracson, Version B Combination bobbin and ascender Bob Thrun Collection, 2017 589 192 107 50 1027
SMC Spider 1215
2434
SMC Spider Milled body, SS cover plate, rear handle
  • On Rope 1, 2009
  • Bob Thrun Collection, 2017
554 214 85 41 739
SOB 3062 SOB Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Xinqiang Yu 新强 余 (tdcq888), 2021 349 235 63 31 460
SunniMix 3044 SunniMix Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Strade FarEast Limited (sportsloving), 2021 339 219 66 33 469
SUT 2460 SUT Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Kangjin Liao, 2017 474 232 66 31 479
TAZ Lov2 2503 TAZ Lov2 Al plates, ss anvil, ss cam on plastic handle, plastic cleat Omni Pro Gear, 2018 364 154 84 42 534
TAZ Lov3 2597 TAZ Lov3 Al plates, ss anvil, ss cam on plastic handle, plastic cleat Omni Pro Gear, 2021 387 152 84 44 563
Tupa 3019 Tupa Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate
  • Runwu Silent (Shenzhen) Technology Co., Ltd. (润物无声(深圳)科技有限公司), 2021
  • Strade FarEast Ltd., 2021
341 218 61 33 436
Vento, Version A 1468 Vento, Version A Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, plastic gate Carl Janysek, 2015 340 218 64 33 452
Vento, Version B 2539 Vento, Version B Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Artyom Babin (Артём Бабин), 2019 463 232 62 32 456
Vertical 2594 Vertical Bent frame, cast upper & lower  spools, aux. rod, stamped gate Artyom Babin (Артём Бабин), 2020 348 210 74 29 446
Xinda King Kong 3033 Xinda King Kong Stamped frame, solid upper spool (cut), cast ribbed lower spool /w stop, aux. rod, wire gate Kangjin Liao (e4store), 2021 316 236 63 32 466
Z&W 2531 Z&W Bent frame, solid spools, cut lower spool, dual top brake linked to handle, stamped gate  Duoqiao Technology (sporting_mall), 2019 376 228 58 30 399

Bobbins False Bobbins Bobbin Weight Distribution