http://kedaikhaula.blogspot.com --- On Tue, 19/5/09, Benny The Great <[email protected]> wrote: From: Benny The Great <[email protected]> Subject: [RSA-INA] [share artikel] Belajar Melakukan Sudden Braking To: "fsrj" <[email protected]>, [email protected], "Pulsarian" <[email protected]> Date: Tuesday, 19 May, 2009, 11:53 AM bahan bacaan yang bagus tentang sudden braking. biar tambah mantab teknik ngeremnya ane terjemahkan bagian yang ane anggap penting aje ye.. http://www.motorcycle.com/rider-safety/knowing-how-to-brake-saves-the-most-lives-88119.html Knowing How to Brake Saves (the most) Lives Practice braking drills to stay sharp By Jeff Cobb, May. 14, 2009 NOTE: This is a basic guide on manual braking for most motorcycles with separate front and rear brake circuits. A few bikes have integrated front/rear brakes or optional anti-lock brakes (ABS). If you have integrated brakes or ABS, some of this won’t apply. Insurance companies strongly endorse ABS. Studies have shown the number of fatal crashes and the severity of individual claims decrease significantly for riders of ABS-equipped bikes. With braking, the use it or lose it principle definitely applies, and skills can become rusty if not proactively attended to. Learning to brake better makes riding more fun and enjoyable, because you have better control. And becoming practiced at making hard stops may add to your peace of mind because your chances are at least improved for handling the unexpected. Researchers have found that riders often panic in split-second traffic confrontations. One study showed that a panic state disabled riders’ conscious reactions and nearly a third of riders observed in an accident scenario simply froze: they didn’t even touch their brakes! Don’t let this happen to you. If you are a new rider, or have been off the bike for more than six months, you will want to carefully brush up on your braking abilities. Even experienced riders benefit from periodic braking drills, or an advanced rider class under the watchful eye of an instructor. Most riders know the front brake does anywhere from 60-90 percent of their stopping. A longer wheelbase cruiser or touring bike tends to be on the lower end of this scale. A sport bike can completely lift the back wheel off the ground in some cases, which would mean the front brake in these examples is doing 100 percent of the braking. The physics behind this is that when braking, the weight transfers forward, and pushes down onto the front tire’s contact patch improving its traction. At the same time the rear loses a proportional degree of traction. Motorcycles therefore usually have one or two larger brake discs up front and a smaller single disc in the rear. Secara fisik, ketika proses pengeraman terjadi, berat motor dan pengendara akan ditransfer ke depan dan disalurkan ke ban depan sehingga menghasilkan traksi (traksi = gaya gesek). pada saat bersamaan, ban belakang kehilangan traksinya. oleh karena itu sepeda motor biasanya memiliki 2 rem cakram besar di ban depan dan cakram tunggal di ban belakang. Before providing tips on the act of braking itself, let’s take a minute to consider some other factors you will want to be mindful of: The front brake provides most of the stopping power on a motorcycle. Rem depan motor menghasilkan gaya henti yang lebih besar dari rem belakang Depending on road surface and temperature, your traction for braking – just as with cornering – can vary greatly. Traksi pengereman bergantung pada permukaan jalan dan suhu - begitu pula pada saat membelok - dapat berubah jauh traksinya When balancing on two small tires your margin of error is much slimmer, so “reading” pavement is a learned skill you will need to develop. Experienced riders know that before deciding how hard to brake, they need to already have a sense about what kind of traction they think they have. pengendara motor berpengalaman akan mengetahui bahwa sebelum mereka melakukan pengereman mendadak, mereka harus mengetahui traksi sebesar apa yang mampu dihasilkan And as a further side note, part of this traction equation is a function of the tires. Are they new, half worn or nearly worn out? Are they sticky street racing tires, or harder compound long-mileage touring tires, or something in between? lebih lanjut, beberapa faktor yang mempengaruhi traksi adalah ban, apakah ban itu baru, setengah terpakai atau gundul? apakah mereka ban balap, ban berkompon untuk touring atau yang lain? You need to know your tires while also developing the skill of gauging what kind of pavement these tires have to bite into. Anda juga harus mengetahui perkerasan jalan seperti apa yang anda hadapi (pavement = lapisan perkerasan jalan). Asphalt can be old, new, smooth, rough, sandy, or littered with gravel. It can also be rippled, oily, and painted – as at intersections, where you typically need to stop, sometimes quickly. Aspal dapat berupa aspal baru, halus, kasar, berpasir atau berkerikil, dapat pula berminyak - pada saat di persimpangan jalan anda harus berhati2 dan berhenti dengan cepat. Sometimes tar has been laid down to cover cracks. This, like oily or painted surfaces, is especially slippery when wet, and even when dry, these surfaces offer decreased grip. terkadang aspal baru saja dituang ke jalan untuk menutupi retakan dan menghasilkan permukaan berminyak. ini akan menjadi licin ketika basah dan ketika kering akan menurunkan daya cengkram ban Some roadways are made with concrete, which also grips differently (often worse than good asphalt). perkerasan kaku (beton) memberikan daya friksi yang lebih kecil dari aspal Metal manhole covers, train and trolley tracks, and metal plates used in repairs are also something to watch out for. lubang selokan, rel kereta dan pelat besi di jalan harus diperhatikan. So, aside from the fundamentals of braking 101, you will be well served to learn to continually scan and judge pavement conditions and quality. JADI, DISAMPING DASAR PENGEREMAN, ANDA HARUS BELAJAR UNTUK TERUS-MENERUS MEMANTAU DAN MENILAI JENIS DAN KUALITAS PERKERASAN JALAN Ok, now for some basics: Braking while cornering presents some unique challenges. You naturally get “practice” every time you ride, but taking time to set up deliberate drills periodically, as mentioned, can make a big difference. A secluded parking lot works. So can a side street (with no one following you) on which you can practice progressively harder stops. You should brake with the front and rear brakes together. Ideally, you take them to near lock-up for hardest braking. If the rear (or front!) skids a little, back off. As you develop sensitivity, both wheels can be taken to near lock up, and you especially want to master the front. Always take great care to work at your own comfort level. This is particularly true for braking while cornering. Definitely learn how to brake while cornering, but be careful. Slick pavement, or sand, gravel or spilled oil can put you down in a millisecond if you brake too hard. In fact, if you know it is gravelly or sandy in a corner, avoid the brakes. Another technique is to “cover” your brake. Basic rider classes may teach riders to use four fingers to pull the front brake lever. But experienced riders learn to ride with two or three fingers ready on the lever at all times. This can save nearly a whole second in reaction time, and that could mean much shorter stopping distances. To calculate just how much sooner you could stop if you saved a second, use the conversion factor of 1 mph = 1.46 feet per second. So, if you were traveling at 55 mph, you are doing 81 feet per second. Learning to decrease your reaction time by habitually covering the brake could theoretically stop you from 55 mph about six or seven car lengths sooner. Likewise, if you were doing 35 mph, a second equals 51 feet saved in stopping distance, or about 4 cars lengths. If you were doing 80 mph, it would equal 117 feet per second, or more than a third of a football field. In all, you want to practice enough until it’s second nature on a variety of pavement types, and a variety of speeds. While there are no guaranties, developing your skills should give you an advantage. With braking, it is best to hope for the best, but to carefully and deliberately prepare yourself for everything else. Jeff Cobb is the editor and publisher of Motorcycle Safety News. Comments, and questions can be directed to [email protected]. Regards, Benny The Great bennythegreat.wordpress.com 6° 13' 43.56" S 106° 49' 10.55" E --~--~---------~--~----~------------~-------~--~----~ ----------------------------------------------------------------------------------------- Share the Road !!!! Untuk posting: [email protected] Untuk keluar dari grup: [email protected] Website: www.rsa.or.id -~----------~----~----~----~------~----~------~--~---
