Ikhonkco lefayibha yedrone ayisebenzi ekubhabha, kwaye umbuzo wokuqala usoloko umalunga nebakala lefiber. Ngaba ngokwenene yayiyi-G.657.A2? Ngaba umthengisi uhambise into ephantsi?
Loo mbuzo awufane ukhokelele naphi na, kuba ibakala lokugoba lilawula ukuba kungakanani na ukukhanya okusinda ekujikeni okuqinileyo. Ayithethi nto malunga nokuba iglasi iyasinda xa itsalwa kwi-spool ngesantya. Ukuqhawulwa kwentlawulo sisiganeko somatshini, kunye neenkcukacha ezixela kwangaphambili ukuba zidla ngokungabikho kwincoko ngokupheleleyo.
Esi sikhokelo sigubungela apho ifayibha isilela ngokwenene, indlela yokufunda inombolo yamandla e-tensile ngaphandle kokulahlekiswa yiyo, kutheni ulwakhiwo lwe-reel lubaluleke kakhulu njengefiber, kunye nento omawuyibhale kwinkcukacha ukuze ibhetshi elandelayo igwetywe ngokuchasene nento ebambekayo.
Impendulo eKhawulezayo: Amanani amathathu athatha isigqibo sokuba iFiber yakho iyasinda
| Inani | Oko ikuxelela kona | Ixabiso eliqhelekileyo le-FPV-grade bare fiber |
|---|---|---|
| Inqanaba lovavanyo lobungqina | Uxinzelelo lokuhlola yonke imitha egqithisiweyo ngexesha lokwenziwa | ~100 kpsi (≈ 8.5–9.2 N on 125 µm ukugquma) |
| Tensile Strength | Umthwalo apho ifayibha yaphuka ngokwenene | ~50 N eqhelekileyo; 55-60 N yeenguqulelo eziphuculweyo |
| Uxinzelelo lwentlawulo | Umthwalo owenziwe yi-reel ngelixa ukhulula ngesantya sokubhabha | Ayipapashwanga nabani na — kufuneka uyivavanye |
Inombolo yesithathu yileyo ephelisa iinqwelomoya, kwaye yileyo ingenayo idatadata. Ivela kulwakhiwo lwe-reel, indlela yokujija kunye nendlela i-drone ekhawuleza ngayo, hayi ukusuka kulwazi lwefiber.
Ukuba ufunda into enye kuphela apha: Ifiber enamandla agqwesileyo yokuqina kwireli yenxeba elibi isaza kwaphuka. I-reel ayipakishwa.
Apho iDrone Fiber isilele ngokwenene
Iintsilelo zentlawulo ziwela kwiindlela ezine. Babiza izilungiso ezahlukeneyo, kwaye ukubaphatha njengengxaki enye kutheni ukusilela okufanayo kuhlala kusenzeka.
Ikhefu elingatshintshiyo
Ifayibha itsalwa ngaphaya komda wayo wokuqina kwisiganeko esinye - i-snag kumqobo, utshintsho olukhawulezayo lwendlela, ukubamba kwi-airframe. Layisha izikhonkwane ezidlulileyo kumda wekhefu kwaye ikhonkco limkile ngoko nangoko.
Lo ngumfanekiso wabantu, kwaye lelona lincinane lixhaphakileyo kwezine.
Ikhefu lokuhlawula elinamandla
Uxinzelelo luyakhula ngelixa i-fiber ikhulula. I-reel ekhupha ngokungafaniyo, umaleko obambe lowo ungaphantsi kwawo, isantya esikhawulezayo kunokuba ipakethe inokondla - nganye iqhuba uxinzelelo ukuya phezulu, kwaye iglasi iyasilela kuwo nawuphi na umthwalo ofikelela kuyo, enokuba ngaphantsi kwamandla ayo alinganisiweyo ukuba kukho isiphene ukuba sihlale kuloo ndawo.
Le yeyona ndlela yokusilela kwinqwelomoya, kwaye ilawulwa yi-reel ngaphezulu kakhulu kunosinga.
I-Abrasion kunye nomonakalo wokungqubuzana
Ifiber ikhuhla kumphetho wereel, indawo yokuphuma yezindlu, okanye ngokwayo. Ingubo yokwaleka, umgangatho weglasi uthatha umonakalo omncinci, kwaye amandla ehla ekuhlaleni. Ikhefu lingenzeka kwimizuzu kamva kwindawo ekhangeleka ingenakulinganiswa.
Umonakalo wefriction uyanda kwaye awubonakali, eyenza kube yeyona ndlela inzima yokuxilonga emva kwenyani.
Ukuxukuxa kunye nokuzingcolisa
Ifiber ibuyela umva ngokwayo, ibamba i-airframe, or forms a knot as it comes off the pack. A knot in optical fiber concentrates stress at a radius far below anything the grade allows, and it breaks there.
Ngoba “it broke” is almost never a grade problem
Three of these four mechanisms are decided by the reel and by flight profile. The fourth — static break — depends on tensile strength, and tensile strength is not what thebend-insensitive grade describes. A1 and A2 are screened to the same mechanical level and differ in bending optics.
So when a supplier confirms the fiber really is A2 and the breakage continues, that is the expected outcome, not a contradiction. For background on how the tethered architecture works and what it costs you, see our guide to thefiber optic FPV drone.
How to Read a Tensile Strength Number
Nantsi ingxaki ebonakalayo. Ababoneleli ababini bacaphula amandla okuqina. Omnye uthi 50 N, omnye uthi 500 N. Eyesibini ibonakala yomelele ngokuphindwe kalishumi.
Ngokuqhelekileyo ayinamandla kwaphela - ilinganisa enye into. I-tensile figure ayinantsingiselo de wazi izinto ezintathu ngayo.
Umbuzo 1: Kwavavanywa ntoni?
Ifiber engenanto, ifayibha eqinileyo kunye nefayibha enentambo zimveliso ezintathu ezahlukeneyo ezinamandla ahlukeneyo.
| Yintoni evavanywayo | Yintoni ethwele umthwalo |
|---|---|
| Ifiber engenanto (245 µm okanye 200/242 µm iglasi eqatywe) | Iglasi ngokwayo |
| Ifayibha ezinqatyisiweyo | Iglasi kunye nomgangatho wesithinteli |
| Ifayibha ezinentambo | Umsonto weAramid, FRP okanye amalungu amandla entsimbi - iglasi ayithwali phantse nanye kuyo |
Ulwakhiwo olunentambo lunokulinganiswa kumakhulu ee-newtons kuba umsonto we-aramid uthwala umthwalo. Elo nani liyinyani kwintambo, kwaye ayibalulekanga kwifiber engenanto kwi-drone reel.
Ukukhangela ngokukhawuleza: if a tensile figure appears alongside words like aramid, ilungu amandla, or reinforced, it is describing a cable. Bare fiber has none of those components. When a bare fiber page quotes a strength that could only come from a reinforced construction, the number and the product do not match.
Umbuzo 2: How was it tested?
Proof test and tensile strength are different measurements, and the gap between them is large enough to look like an error when it is not.
- Uvavanyo lobungqina — every metre of fiber is subjected to a defined stress during manufacture. Anything that fails is removed. This is a screening threshold, not a strength rating.
- Tensile Strength — the load at which the fiber breaks, usually reported as a Weibull distribution because glass strength is statistical rather than a single value.
The next section covers why they differ by roughly six times.
Umbuzo 3: What unit?
Fiber strength appears as newtons, GPa or kpsi depending on the datasheet, which makes specs look incomparable when they are not. All three convert freely, because stress is force divided by cross-sectional area.
Kumgangatho 125 µm ukugquma:
Iindaba=πr2=π×(62.5×10−6)2=1.227×10−8 m2
Force(N)=Stress(Pa)×Iindaba1 GPa=145 kpsi
Which gives:
| Stress | Force on 125 µm ukugquma | Equivalent |
|---|---|---|
| 0.69 GPA | 8.5 N | 100 Kpsi |
| 3.20 GPA | 39.3 N | 464 Kpsi |
| 4.00 GPA | 49.1 N | 580 Kpsi |
And in reverse:
| Force | Stress | Equivalent |
|---|---|---|
| 9.0 N | 0.73 GPA | 106 Kpsi |
| 50 N | 4.07 GPA | 591 Kpsi |
| 60 N | 4.89 GPA | 709 Kpsi |
Keep that first constant and you can convert any fiber strength spec yourself.
Worked example: reading a real datasheet
Take a bare fiber datasheet listingProof Test ≥ 9.0 N / ≥ 100 kpsi Uphuculo olongezelelweyo kumgangatho wokuqala we-APON - kunye nokuwa kancinci kancinci kwi-ATM njengeprothokholi - kukhokelele ngokupheleleyo., elsewhere on the same page, a headline figure of several hundred newtons.
Run the three questions:
- Kwavavanywa ntoni? The proof test line is bare fiber. A several-hundred-newton figure on 125 µm glass converts to tens of GPa — above the theoretical strength of silica. It cannot describe bare fiber, so it is describing a reinforced construction.
- Kwavavanywa njani? 9.0 N is a screening threshold. The headline figure, whatever it belongs to, is a break load. Different measurements.
- What unit? Both in newtons, so the units are not the discrepancy.
Two figures on one page, describing two different products. Neither is necessarily false — but they are not comparable, and only one of them is the fiber going onto your reel.
Do this before comparing quotes and the comparison becomes possible. Skip it and you will choose on a number that describes a cable you are not buying.
Proof Test vs Tensile Strength
What proof testing actually does
Proof testing pulls the entire length of fiber to a defined stress during manufacture. Its purpose is elimination, not qualification: naliphi na inqaku elibuthathaka ngokwaneleyo ukuba lingaphumeleli kwelo khefu loxinzelelo kumzi-mveliso kunakwi-reel yakho.
Iindaba 100 kpsi proof test ke iqinisekisa umgangatho. Yonke imitha yasinda 0.69 GPA, ngokurhabaxa 8.5 N. Ayithethi ukuba ifayibha igqabhuka ngaphezu koko.
Kutheni la manani mabini ahluka ngokumalunga namaxesha amathandathu
Amandla okuphela kwekhefu ahlala kakuhle ngaphezu kwenqanaba lokuhlola. Ifiber yethu ye-A2 ixela ≥ 4.00 GPA kwi 50 % Weibull probability - malunga49 N - kunye namaxabiso aqhelekileyo ngeenxa zonke50 N, kunye neenguqulelo eziphuculweyo ezilinganiswe kwi55-60 N.
Ngoko ke, ucwecwe olufanayo luthwala ngokusemthethweni i-a 100 Ukalo lobungqina be-kpsi kunye ne-~50 N yamandla okuzibamba. Umlinganiselo malunga5.9×, kwaye yenzelwe ngaphakathi:
| Ixabiso | Indima | |
|---|---|---|
| Uvavanyo lobungqina | ~8.5 N (100 Kpsi) | Umgangatho wokuhlola - yonke imitha idlulile |
| Tensile Strength | ~50 N (4.07 GPA) | Umthwalo wekhefu oqhelekileyo |
| Ukuqina okuphuculweyo | 55-60 N | Ilinganiswe kwiinguqulelo eziphuculweyo |
Ukufunda inani lokuqala njengesibini kwenza ukuba umsinga ubonakale ubuthathaka ngokuphindwe kathandathu kunokuba unjalo. Ukufunda okwesibini njengeyokuqala kwenza i-screening threshold ibonakale njengesiqinisekiso sokusebenza. Zombini iimpazamo zivela rhoqo kwiingxoxo zokuthenga.
Oku kuthetha ntoni kwi-spec yakho: cela zombini. Uvavanyo lobungqina lukuxelela umgangatho wokuvelisa; amandla okuqina akuxelela umda osebenzayo.
Uyilo lweReel: Kutheni Umoya Wangaphakathi Ubalulekile
Inkcazo yefiber ibeka umda ophezulu kwinto enokuphila ngayo ikhonkco. I-reel ithatha isigqibo sokuba ungakanani lo mda owufumanayo.
Umoya wangaphakathi vs wangaphandle
Ukujija kwangaphandle ishiya i-fiber ngaphandle kwe-reel body, evezwe kwizindlu, i-airframe kunye nantoni na ibrashi yedrone edlulileyo. Lonke ujiko oluveziweyo lunokuba yindawo yokurhawuka.
Ukujija kwangaphakathi igcina ifayibha ngaphakathi kwindlu ngexesha lokukhululwa. Ipakethi ikhuselwe kuqhagamshelwano lwangaphandle, kunye nosinga luhamba ngendlela elawulwayo yokuphuma kunokuxobula indawo evulekileyo.
Indlela yokusebenza ithe ngqo: iindawo ezimbalwa zoqhagamshelwano zangaphandle, ingxabano encinci, iindawo ezimbalwa zokubamba ifayibha ngexesha lokukhululwa okuguquguqukayo. Oku kubaluleke kakhulu kwindlela yokusilela ebangela ukuba ezona nqwelomoya zininzi ziphele kwangoko - ikhefu lentlawulo eliguqukayo, apho i-tension spikes zivela ekukhululweni okungaqhelekanga kunokuba nakuwuphi na umqobo omnye.
Izinto ze-reel kunye nobunzima
Ubunzima bereel buthwalwa kuyo yonke inqwelomoya, ngoko ikhuphisana ngokuthe ngqo nebhetri kunye nomthwalo wokuhlawula.
3Izindlu ze-ABS eziprintiweyo ze-D zilungele esi sicelo ngezizathu ezingaphezulu kobunzima: ijometri inokudityaniswa ne-airframe ethile, kwaye uhlaziyo alufuni isixhobo esitsha. Oko kubenza bafaneleke kakuhle kwiprototyping kunye nolwakhiwo oluthile lweqonga. Ukubumba isitofu kuba noqoqosho ngakumbi kwimithamo ephezulu, ngexabiso lokusebenzisa ixesha lokukhokela kunye noyilo lokutshixa.
Inqaku lobunjineli kukuba i-reel geometry - i-barrel diameter, isithuba seflange, indlela yokuphuma — luyilo oluguquguqukayo olumataniswa neqonga, ayamkelwa njengayo nayiphi na isitokhwe somthengisi.
I-resin yokwaleka kunye nengxabano
Umaleko okhethiweyo wentlaka phezu kwepakethi yenxeba unciphisa ukukhuhlana phakathi kokujika okukufutshane kwaye wongeza umlinganiselo wokhuseleko ngexesha lokuphatha.. Kwakhona yongeza ubunzima.
Ingaba kufaneleka ubunzima buxhomekeke kwiqonga. Iiprofayili zokukhawulezisa ezinobundlobongela, apho ukukhuhlana phakathi komaleko kunokwenzeka kakhulu ukuba kunyuse uxinzelelo, inzuzo kakhulu. Ukusasazwa okucothayo kusenokungayifuni. Ask your supplier which they recommend for your specific speed profile rather than treating it as a universal upgrade — and note that reducing the coating diameter, which changes both pack density and weight, interacts with this decision.
Payout Speed and the Tension Window
Every reel has a speed range within which the fiber releases cleanly. Below it, slack can accumulate and loop. Above it, tension rises until something fails.
That window is a property of the assembly — fiber, winding pattern, reel geometry and exit path together — which is why no fiber datasheet can tell you what it is. It has to be measured on the actual pack.
How to establish it:
- Run pay-out on the bench across your intended speed range, with the reel mounted as it will be on the aircraft.
- Watch for the two failure signatures: hesitation or jerking (a layer catching) and slack accumulation (releasing faster than the drone advances).
- Note the speed at which either appears. Your operational ceiling sits below it, with margin.
- Repeat after any change to reel geometry, winding method, coating diameter or fiber length.
Aggressive acceleration is the most common way to exceed the window in flight. A profile that works at a steady climb may fail on a fast departure, and that difference will not appear on any specification sheet — only on the bench.
Also relevant to theminimum bend radius the pack imposes: a tightly wound reel holds the fiber near its bending limit for the entire flight, not just at the moment of release.
Ubude, Weight and Flight Time
Reel length is a three-way trade, kwaye ukongeza nakuphi na okuguquguqukayo kukubiza ezinye ezimbini.
- Ifiber eninzi ithetha uluhlu olude olunokubakho kunye nepakethe enzima.
- Ipakethi enzima kuthetha ixesha elifutshane lokuhamba ngenqwelomoya kunye nomthamo oncitshisiweyo womthwalo.
- Ixesha lendiza elifutshane kuthetha ukuba ngaphantsi koluhlu lwethiyori olufikelelekayo.
Ngaphaya kobude obuthile ifayibha eyongeziweyo ayinakusetyenziswa ngaphakathi kokunyamezela okuseleyo, ke impendulo esebenzayo kubukhulu bereel kwiradiyasi yobuthunywa kunye nomda, kunokuba iqonga lingaphakamisa.
Idayamitha yokwambathisa ingena apha ngokunjalo. Ingubo encitshisiweyo ibeka ubude obuninzi kwi-reel efanayo kubunzima obuphantsi, ngeendleko zoluhlu oluncinci olukhuselayo kunye nokuziphatha okuhlukeneyo kokuphatha. Whether that trade is worth making depends on the platform and on how much handling the fiber sees before flight — the mechanical characteristics of reduced-coating fiber should be requested specifically rather than assumed from the standard datasheet.
What to Put in Your Specification
Most drone fiber specifications describe the fiber and stop, which leaves the parts that determine payout survival entirely to the supplier’s discretion. These lines make a batch verifiable.
Ifayibha
- Fiber grade and the ITU-T category it complies with
- Ububanzi beNtloko, stated explicitly (200/242 µm okanye 245 µm — do not leave it implied)
- Inqanaba lovavanyo lobungqina, in kpsi or N, with the unit stated
- Tensile Strength, stated separately from proof test, with the measurement basis (eqhelekileyo, or Weibull probability level)
- Attenuation at your operating wavelengths
Reel
- Indlela yokujija: ngaphakathi okanye ngaphandle
- Reel material and total wound weight
- Fiber length per reel, with tolerance
- Ijiyometri yereel: barrel diameter and exit path configuration
- Resin coating: required, ngokuzikhethela, or not required
Verification
- Per-reel OTDR trace and attenuation record
- Pay-out test evidence at your intended speed range
- Batch traceability from reel to fiber lot
Two clauses worth adding explicitly:
Tensile strength shall be stated for bare fiber, not for a cabled or reinforced construction.
Proof test level and tensile strength shall be reported as separate values.
Those two lines make it impossible to answer your specification with a number that describes something you are not buying.
How to Verify Before Acceptance
On documentation. Request the per-reel OTDR trace and attenuation record. OTDR shows attenuation along the full length and reveals point discontinuities that a single end-to-end measurement will not catch. Check that the trace corresponds to the reel you received, not to a batch sample.
On the reel itself. Inspect the wind before mounting. Look for crossed layers, uneven tension between layers, and any point where the fiber sits against a sharp edge. A visibly irregular wind will pay out irregularly.
On the bench. Run the pay-out test from the previous section before the first flight, not after the first failure. This is the only test that exercises the actual mechanism that ends flights, and it costs one reel of your own time rather than one aircraft.
Across batches. Keep the OTDR records. When a failure does happen, the difference between a reel that met spec and one that did not is only visible if you have the earlier records to compare against.
Fibconet supplies bend-insensitive bare fiber and wound reels for civil and industrial field communication — emergency response, ukuhlolwa kwe-UAV yemizi-mveliso, khangela kwaye uhlangule, kunye nokusasazwa kwenethiwekhi okwethutyana. Tensile level, Idayamitha yokwaleka, resin coating, reel design and per-reel OTDR reporting are specified per platform; see G657A2 FPV drone fiber on 3D-printed ABS reel for the material specifications, or send us your platform parameters and payout speed range and our engineering team will review them against measured fiber data.
