Thank you for comment. Exactly. discord axes of roll and axle twist, in my thought ,it need for crawling on slope,side hilling. it prevent inclining the body for shaft-drive and also MOA.its the goal for flex and stability. Wide stance is lower center, too wide under axle hit easily. tires inside distance is narrow better. stance/wheelbase ratio is important for running through rocks. my crawler refered to full-scale truck Scorpion,jeep MB/GPW,low cost,easy build,1/10scale,so unused clod axle.
I can see your son is already interested in it. I see how you used two tank style motor/gear units. By changing the wires to the ESC (2) you could make that truck steer like a tank also (just a thought). I like the way you think,some r/c maker might be happy to buy some of your thoughts. Great job,and I know your son will do something great in this hobby too. Mike D Secaucus, NJ
flex shaft? I wonder if I could put some electric window motors to work like that... okay nevermind I saw the weak motors you have.... I think i'll go to the junkyard tomorrow and get some to work with. Very cool innovative stuff here...
@gewizz2 yes, b/l is much more efficient. longer run times. but again, in a crawler this is almost not an issue. your typical brushed crawler with a 1100mah nimh pack will have more run time than you will ever need. you arent on the throttle that much in a crawler like you are in a plane car or boat....
@gewizz2 b/l motors are more expensive than brushed motors. you can get a HK brushed for like 83 cents. The HK esc wont work well in a crawler because no drag brake {unless crawler has worm gear axles, then you dont need drag} a Sensored brushless does not have the low rpm issue most b/l have..but they are much more expensive. if you are getting into crawling there is NO advantage to bl. the wheel speed is nice if you can use it properly, otherwise it just makes it hard to go slow.
very impressive. yet, where is the clearance from axle to chassis?like when u r driving up a small ledge, head on. Not much ground clearance for the chassis
Thank you for comment. I use gear box is tamiya craft kit double gearbox, with some modifications; for strength final gear and the drive pinion gear is metal gear, dirve shaft is stainless steel shaft. plazma dash motor is using for torque and wear against high-current at low speed crawling, it has big commutator shaft.
@gewizz2 brushless are less common because they offer a very poor feel, non sensored brushless have a very noticeable cogging sensation at low rpm. This is inherent trait due to there three phase design. with no sensor the esc doesnt know rotor position, causing this cog until syn can be achieved. sync stat ON requires revolutions no matter how you look at it. rev = time. besides, crawlers go slow. B/L is efficient through rpm. ALOT of money is spent to go brushless with little or no advantage.
Very nice and interesting built crawler and a different kind of very nice video. Like it cause its not just 10 min boring drive but nice to see how its made and for sure you are a maker :-D So you got 4 complete independent drive wheels? Mechanical total without of interesting construction but fully functional i think. Do you have the motors to act like differential so they got power as the way the steering is set?
dont mean to say this sucks cause its a good idea but i think it brings more thrill to the people when ur on only 2 wheels wondering if ur ganna tip or not same with real life driving rock crawlers i dont think half the people there today will think its fun if they did that to their real cars either
Thank you for comment. the real truck its my incentive, there seems using propeller shaft and tube frame axle carrier.(search " scorpion 4x4 scorpionrear.jpg ") its complicated for me, my RC crawler is motor on axle.
Cool build. Goofiest music ever though ;) BTW: Looks like one of your axle shafts is bent :/ I like the suspension design though. Interesting setup. But why are the springs lifting the axle up rather than pressing it down?
in the real world that design would cause a bad crab walk under compression of the suspension... hents why cars and rock crawlers using latteral mounted shocks/springs still use trailing arms.
@Duckyistrippin i think i got it, so B/L motors are rough at low revs? ok , i often hear people saying B/L motors are expensive but i got my B/L motor with 35amp ESC on Ebay from honkkong and it was very cheap!! but is for my plane! so maybe car B/L motors are more expensive?
