This is what the test leader leaves on the glass
This is what the test leader leaves on the glass. This is what the test leader leaves on the glass.
First, let us explain what exactly is the complexity of such examinations. The fact is that the janitor should work well not only immediately after purchase (everyone can check this), but also after prolonged use. For example, after 100-150 thousand cycles, in the heat and frost, after exposure to the scorching sun (poor-quality tires can stiffen and crack due to this), in the parking lot and at a speed of a hundred (a wind tunnel is already needed here). Just such tests were carried out jointly by the German and Austrian clubs ADAC and ÖAMTC. At the same time, we got a comparison of two different designs of brushes - frame and frameless.
HOW TO TEST
The experimental test brushes were mounted on a Volkswagen Golf IV prototype, while water was constantly poured onto the glass from the washer nozzles (in frost it was, of course, an ice-freezer). The presence of streaks on the glass after passing the brush was evaluated. But what about “normalized dirt”, the removal of which implies our GOST? We answer: it is not observed on German roads, therefore, there is nothing to check - only rain. It’s good that the sun shines the same for everyone and the janitors are exposed under a quartz lamp. It is worse with frost: they decided not to fall below minus eight, again based on local climatic characteristics. So this test will not be able to tell anything about the behavior of brushes in true Russian frosts.
And here is what the outsider reserves on the glass. The difference is obvious
And here is what the outsider reserves on the glass. The difference is obvious. And here is what the outsider reserves on the glass. The difference is obvious.
HOW DO YOU THINK
Note that according to the methodology adopted by the clubs, the results obtained were evaluated by experts in points with weight coefficients. So, for example, the priority of glass cleaning quality was expressed by a coefficient of 0.8, and the convenience of mounting on a leash - 0.2. The Germans decided that the work of janitors at +20 is more important than at -8 ° C (again 0.8 versus 0.2), but they have equal ratings of work in the new state, after 100, 000 cycles and after aging in the sun. However, all this is important only for understanding how the final rating turned out. And from the complete table, each reader will be able to choose the most important parameter for him. And one more remark: do not be surprised that the better the janitor, the less points he has. In German schools, exactly the count is the highest mark!
And this is what happened. Frameless brushes lead almost unconditionally: only one wireframe model has earned a "good" rating. Regarding the issue price, we have lowered the cost of brushes in Europe. However, we can note: a direct relationship between quality and price is not observed until it comes to frankly cheap brushes. So, the outsider of the test costs five to ten times less than the rest of the participants. All good and excellent students were grouped in the price range of 28–42 euros. Among troechniki there are models from 16 to the same 42 euros. And only Unitec can be purchased for three rubles. So is it not more profitable to buy ten bad ones instead of one good brush and just change them more often? Alas, judging by the estimates, they do not clean the glass well, even being new. In the beginning, we mentioned wind tunnel tests at high speeds. Those turned out to be unbearable for car clubs, but the teeth of the TÜV organization. And in this parameter, Bosch Aerotwin and SWF Visioflex became leaders. But it is, note …