Philthy Posted May 4, 2014 Share Posted May 4, 2014 (edited) Hi all first post here. I am very new to rc cars so please excuse my ignorance. We had the Tomahawk racing around madly today until the accelorator just stopped responding. Pull the trigger and no movement. The engine continued to run on idle and we had steering Does anyone have a suggestions please? Thanks edit: to be more specific the throttle servo isnt responding but the steering servo is fine Edited May 4, 2014 by Philthy Quote Link to comment Share on other sites More sharing options...
Rikardo Dust Posted May 4, 2014 Share Posted May 4, 2014 Swap the connections over for the throttle/steering servo's on the receiver and try it! If the throttle servo still doesn't respond it's probably borked! If it does then it's something to do with radio/receiver! Quote Link to comment Share on other sites More sharing options...
Philthy Posted May 4, 2014 Author Share Posted May 4, 2014 Thanks Rikardo, swapped them over and the steering worked with the trigger so i concur with you borked diagnosis This thing is about 15 minutes old. Is it normal for a servo to just die like that so early? Are there better quality parts that will fit the bx and where would i get them from? Cheers Quote Link to comment Share on other sites More sharing options...
gavin28 Posted May 7, 2014 Share Posted May 7, 2014 (edited) Standard servos are usually crap and is always a popular first upgrade, servos are pretty much standard in size for 1/10 and 1/8 scale cars so any decent servo will do. For steering you will definitely want metal gears at at least 10kg/cm in torque. something like this if you want a decent servo at a reasonable price http://www.modelsport.co.uk/alturn-usa-high-performance-race-servo-high-torque-/rc-car-products/359784 or if your on a tight budget then this will do but 1 of mine died after a couple of gallons of bashing in my 1/8 buggy (still good value!) the other is still going strong in my 1/10 truck though its not used as much. http://www.ebay.co.uk/itm/MG996R-Metal-Gear-Digital-High-Torque-Servo-for-Futaba-JR-2C-RC-TRUCK-CAR-/301156883325?pt=UK_ToysGames_RadioControlled_JN&var=&hash=item461e595b7d Just remember you usually get what you pay for. Edited May 7, 2014 by gavin28 Quote Link to comment Share on other sites More sharing options...
Philthy Posted May 15, 2014 Author Share Posted May 15, 2014 Great thanks Gavin i will grab a couple of those. Cheers Quote Link to comment Share on other sites More sharing options...
Philthy Posted June 8, 2014 Author Share Posted June 8, 2014 Whilst waiting for my flash servo to arrive i found another el cheapo at the local toy store. Fitted it, refitted it, refitted it and got the beast going again until it went completely wide open, had a massive stack and servo no work no more :-| Anyway i know the new servo is waiting for me at the post office for collection tomorrow and before i go ahead and fit these and possibly stuff them up again tell me what the tricks/pitfalls are when fitting a new throttle servo. Quote Link to comment Share on other sites More sharing options...
gavin28 Posted June 9, 2014 Share Posted June 9, 2014 make sure you set the end points correctly up on your transmitter to avoid burning out you new servo Quote Link to comment Share on other sites More sharing options...
Philthy Posted June 9, 2014 Author Share Posted June 9, 2014 Ok....that sounds like what i didnt do with the last one but i dont know what that means exactly. Can you explain further please or if this is covered elsewhere shoot me a link Quote Link to comment Share on other sites More sharing options...
gavin28 Posted June 10, 2014 Share Posted June 10, 2014 there should be a dial on your transmitter, maybe called dual rate, or end point adjustment. It limits the travel of the servo, so basically you want it so when at full throttle the carb is just fully open and not straining the servo. Same with the steering servo, you want it so its just on full lock and not straining the servo when the wheel on the transmitter is fully turned. The instructions for your transmitter will be in the manual Quote Link to comment Share on other sites More sharing options...
Philthy Posted June 11, 2014 Author Share Posted June 11, 2014 Yers the manual....RTFM? Have certainly read the manuals a number of times but being new to RC nitro its like reading dutch sometimes - dutch hater!!! haha Will lock myself away in the shed this weekend, resist drinking and have another go. Appreciate your help Gavin Quote Link to comment Share on other sites More sharing options...
gavin28 Posted June 11, 2014 Share Posted June 11, 2014 no probs pal, unfortunately not all transmitters have this function. If that's the case it would involve playing with the linkages to get it set up correctly - but try the transmitter first, as that's quicker and easier Quote Link to comment Share on other sites More sharing options...
fadzy Posted June 11, 2014 Share Posted June 11, 2014 Have you also checked the batteries? On a few occasion my tomahawk vx has had eratic servo behaviour and was fixed simply by changing batteries. Quote Link to comment Share on other sites More sharing options...
gavin28 Posted June 11, 2014 Share Posted June 11, 2014 Have you also checked the batteries? On a few occasion my tomahawk vx has had eratic servo behaviour and was fixed simply by changing batteries. it was burnt out servo, which he has now replaced. He now just needs to set it up correctly to reduce the likelihood of it happening again Quote Link to comment Share on other sites More sharing options...
Philthy Posted June 13, 2014 Author Share Posted June 13, 2014 Righto Gav dials relating to throttle on the transmitter are throttle trim and 2 x dials -hi & low - throttle ATV which "provides the function to preset independently throttle travel of the servo either side of nuetral. It offers easier adjustmentys to set the throttle operation at idle and maximum power" I kinda get it but mostly dont. Can anyone translate it to basic english for me please? Also, after i have stuck the new servo in, my plan is to turn it all (not start the engine though) on give the accelerator a couple of burst and then fit the servo horn, throttle linkage and brake linkage so that the carburetor opening is in the idle position - 0.5 - 1 mm am i on the right track here? sorry for being a dunce Quote Link to comment Share on other sites More sharing options...
gavin28 Posted June 14, 2014 Share Posted June 14, 2014 (edited) OK pal Throttle ATV, translates to End Point Adjustment Just what we want. Follow your procedure as that's correct but there's an extra step at the end - You need to set the end point of travel for the new throttle servo. When you adjust that dials, you will notice that if affects the travel limit of the servo, you need to set it so the servo stops trying to turn once on full throttle, this stops the servo being strained and burning out when holding full throttle Same for brake if you can, set it so you get full brakes, obviously, but dont set the travel too long otherwise you are putting extra unneeded strain on the servo BTW your not a dunce, we all had to learn this sort of thing at some point Edited June 14, 2014 by gavin28 Quote Link to comment Share on other sites More sharing options...
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