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Hello. I am relatively new to LEGO and very new to Technic. I am particularly interested in the challenges presented by building rock crawlers. My first build was JJ2's 4x4 Super Cralwer V1, which was very rewarding. SevenStuds then kindly directed me to Yoraish's Little Boy Rock Crawler as an instructive build, which it certainly has been. Having just completed it, I have a number of questions that I have not been able to satisfactorily work out for myself and am hoping to benefit from community wisdom. (I am using a rechargeable battery and a V2 IR receiver, along with the original 2 XL motors for driving and the M motor for steering. I am also using very cheap tyres that approximate Pro-Line Flat Iron 1.9" tyres as a test before forking out for the real ones.) I understand, I think, that you might choose to use a M motor (or a L motor?) for steering if (a) you don't have a Servo motor, or (b) have space constraints and/or (c.) require greater torque. Are there any other circumstances where you would use a M or L motor for steering over a Servo motor? I tried using a Servo motor instead of the M motor and it does not turn the wheels at all, although it attempts to. I assume that this means that it does not have enough torque? In Sariel's book, he mentions that the Servo motor has "huge torque" and so "won't be easily stalled" (p. 169). The M motor, however, easily turns the wheels. Does this mean that the M motor has significantly more torque than the Servo motor (Sariel's book doesn't appear to give the torque for the Servo motor, or if it does I missed it) If so, are there any circumstances where you would/could use a Servo motor for steering a crawler and how would you decide this other than trial and error? Yoraish's has the Little Boy doing some pretty extreme crawling (at least it seems so to me) with little difficulty. I find it difficult to tackle a pillow in my lounge without it sounding like something is going to break while steering and have, in fact, managed to pop a wheel off (I experienced the same difficulties with the Super Crawler, which JJ2 kindly helped me to address). I gather that the M motor just keeps turning until you stop (but that unlike the Servo motor does not return to centre when released); this sounds distressing and seems like it could cause actual damage. Is there any way to overcome this? I ask because I and my son - 2 and 1/2 - find it difficult to concentrate on negotiating obstacles due to concerns about damaging something and/or bits popping off. Perhaps it requires greater skill than I/we have at steering? Sorry if I have not asked this particular question well. Many thanks, Darryl and Reuben P.S. I think/hope I have done the images correctly. P.P.S. Any other recommendations for refining this build would also be appreciated (DLuders was very helpful in devloping the initial thread - many thanks).
