Crazybill

Thank you very much! When I bought the receiver I didn't even know there were 2 versions... Thanks to all the other contributors as well. This is an excellent forum!

I don't own any other remote, the batteries ate perfect, the model works OK without the RC. but the steering is clunky. Yeach, I know, gotta get a servo motor for that. Little place for making any modifications anyway

DrJb, that was an excellent explanation. I truly appreciate the time and effort you put into typing it. Thank you! I thought as much regarding the servo motor. It truly is the tool of trade for what I'm trying to achieve here so I guess I'll buy one.

when you say you had the exact issues you mean the whining noise etc.? is this a known issue? because apart from the the renote control, all parts are brand new. as to gearing down the m motor to get enough torque, can anyone please explain how it is done and explain the main difference between a regular motor and a servo one?

Thanks for replying! To your question - yeah, I did. That's the only way the wheels *sometimes* get enough juice to drive (using the L-motor). I say *sometimes* because usually it does this whining noise in this case as well. As for the m-motor controlling the direction: it whines all the time when connected via the IR receiver.

Hi all. I downloaded the 3D model and built a modified RC version of Lego 42005 shown in this link http://www.eurobricks.com/forum/index.php?showtopic=88490 I used an L-motor (88003) and IR receiver (8884), but I had to use alternative parts for the other 3 power function parts as I don't have them: I used Battery pack 8881 (instead of 8878) - for powering the whole thing I used Medium motor (8883) instead of servo motor (88004) - for controlling the wheel direction I used Remote control 8879 (instead of 8885) What happens is that if I connect the units directly to the battery pack, the model drives fine (the L-motor), but the wheels don't turn very nicely at all (unless there's very little resistance, as when I hold the model in the air). So I guess using a regular motor instead of a dedicated servo one isn't a good choice. The real problem however is when I connect the thing using the RC; the IR receiver unit sounds a high pitched noise and the motors don't spin at all, unless I hold the car in the air (and that also is a hit and miss. especially for turning the wheels). Can anyone please explain what I'm doing wrong? Is the remote control faulty (it's came from a train set, dunno if this means anything), is the battery pack too weak (I used freshly charged batteries), is a regular motor inadequate to simply turn an axle if the turning range is limited (the wheels are already all the way to the right/left)? Thanks for helping out!