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Model Forum / Radio Controlled / Land Models / July 2004Air filter foam
I just did some cleaning on my truck for the first time and removed and cleaned the air filter element foams. I used nitro fuel as suggested in the owners manual and did they ever grow in size! They almost doubled! They did clean up very nice though, will they go back to their original sizes or are they boned? They seem to fit back in the rubber cage they came out of OK? Should I get some new ones? Is there a built-in safety devise ,deadman switch, should the batteries in the receiver die? Is there such a thing? Or should I just keep checking the voltage of the battery packs with the multimeter? If so what is an acceptable voltage NOT to draw past?? ( 4, 1.5's AA's in the truck and 8, 1.5's AA's in the controller ) -- Thanks, Steve >I just did some cleaning on my truck for the first time and removed and >cleaned the air filter element foams. I used nitro fuel as suggested in the [quoted text clipped - 8 lines] >what is an acceptable voltage NOT to draw past?? >( 4, 1.5's AA's in the truck and 8, 1.5's AA's in the controller ) A failsafe is what you are thinking of. Though there are many others out there, http://www.ofna.com/failsafe-micro.html should give you an idea of what they do. A small but important point - a failsafe will not help you if the rx pack completely dies of course, since the failsafe itself is powered off the pack. A mechanical spring (I've even seen a rubber band) is also required to be 100% safe. Mike > >I just did some cleaning on my truck for the first time and removed and > >cleaned the air filter element foams. I used nitro fuel as suggested in the [quoted text clipped - 12 lines] > out there, http://www.ofna.com/failsafe-micro.html should give you an > idea of what they do. Thanks for those points and the site. How can I find out what the minimum voltages can be, of the transmitter and receiver, before I hit any dangerous threshold of having a runaway car to the next county? ;-) -- Thanks again, Steve > A small but important point - a failsafe will not help you if the rx pack > completely dies of course, since the failsafe itself is powered off the [quoted text clipped - 23 lines] > > out there, http://www.ofna.com/failsafe-micro.html should give you an > > idea of what they do. > Thanks for those points and the site. How can I find out what the minimum > voltages can be, of the transmitter and receiver, before I hit any dangerous > threshold of having a runaway car to the next county? ;-) NiCd and NiMH batteries have a high initial peak voltage, a stable voltage for most of their operation, then they drop suddenly ("dump") to a very low voltage. So, anything below the stable voltage means that the pack is almost dead. Look at the discharge graphs on http://www.hobbytalk.com/modules.php?op=modload&name=Sections&file=index&req=vie warticle&artid=112&page=1 These are 6-cell car packs under high load. to see what I mean. At about 1 volt per cell, you are close to total failure. Rick R. I can't answer that Q, but I can say that most failsafes will cut in when the Rx pack drops below 4.8 volts > Thanks for those points and the site. How can I find out what the minimum > voltages can be, of the transmitter and receiver, before I hit any dangerous [quoted text clipped - 39 lines] > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.726 / Virus Database: 481 - Release Date: 7/22/04 > A small but important point - a failsafe will not help you if the rx pack > completely dies of course, since the failsafe itself is powered off the > pack. A mechanical spring (I've even seen a rubber band) is also required to > be 100% safe. Although technically correct I've found in practice that even when the receiver batteries die the receiver electronics suffer before the failsafe as the failsafe works to a lower supply voltage. This has meant that when my batteries died the receiver gave up the ghost, the failsafe kicked in and pulled the servo hard against the throttle tensioner spring. Because the servo was now under high load on a flat battery pack the supply voltage dropped and it self regulated. If your pack dies very quickly, your fail safe doesn't work at low voltages or you lose connection from your battery pack you will be screwed without Mike's suggested mechanical spring but it will flatten your battery pack much quicker! :) Thanks Peter J, installed the fail-safe this evening! Works just fine in the test, lets just hope it works for real when the time comes. ;-) -- Steve > A failsafe is what you are thinking of. Though there are many others > out there, http://www.ofna.com/failsafe-micro.html should give you an > idea of what they do. |
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