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Model Forum / Radio Controlled / Land Models / March 2007Electric motor selection
This is a bit of a newbie question. I will start off by explaining what this is for first. I am taking part in a local engineer's challenge. The goal of the challenge is to take a cheap ($35 or less) R/C car, mod it (budget is $150 CND) and race a circuit track and a drag strip (R/C scale of course). Now the question, Assuming that $35 will get me a car with a radio that is capable of full forward, off and full reverse, what am I looking at for a motor upgrade? Can I simply find one with minimal accessories built in, to get me the full forward/reverse? I am noticing that I can get a speed control/motor combination kit, but I may be screwed on adding anything else to the car. Any suggestions? I have not purchased the R/C car at this time, as I am still searching for a car that will make modifications a bit easier. Thank you, Mike : This is a bit of a newbie question. : I will start off by explaining what this is for first. [quoted text clipped - 17 lines] : Thank you, : Mike first off what scale?1:10th 1:12 1:18 ? I would definitely ebay. > : This is a bit of a newbie question. > : I will start off by explaining what this is for first. [quoted text clipped - 21 lines] > > I would definitely ebay. I am running a 1/10th JINHONGLONG Formula A car. Picked up the car today for $35CND. The car has independent springs in the front and a mono spring in the back. For being a cheap car, it does allow for wheel removal, and the motor as some room around it, so I should be able to replace the motor with little to no modifications. The rear axil is not solid, so controlling the car with sticky tires should be easier then originally suspected. With the current setup in the car, the motor is receiving 7.5V. What power requirements are needed for some of these brushed motors I see online? Mike mlawrenc(at)gmail.com : > : This is a bit of a newbie question. : > : I will start off by explaining what this is for first. [quoted text clipped - 38 lines] : Mike : mlawrenc(at)gmail.com most if not all run on 7.2 volts. though high performance batts and a very expensive esc can put that up. its the ampage at this point too. my cheap mtroniks 27x2 draws 2.14 amps at 7.2volts. top of the range motors that are then stripped and tuned can draw 11amps. Basically flatten a 7.2volt 3700mah 6 cell pack in just over 4 mins. The rules are 27 turn= stock, 19 turn superstock, 17 turn very fast. 12 turn F£"k me! oh yeah x2 or x4 after the number of turns means more speed too. > : > : This is a bit of a newbie question. > : > : I will start off by explaining what this is for first. [quoted text clipped - 46 lines] > turn superstock, 17 turn very fast. 12 turn F£"k me! oh yeah x2 or x4 > after the number of turns means more speed too. You mentioned X number of turns and I am assuming the x2 and x4 are the number of winds? What exactly are these numbers? I have seen motors with from say 10 to 18 turns, and they are all the same price (same make/model, just different turn #). I was looking at something simular to this motor; http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJSS9&P=0 I am more then likely not going to be purchasing from this company (cross boarder shopping will put me over the budget), but found that this site appears to have the most info I could find on the components. Mike mlawrenc(at)gmail.com You mentioned X number of turns and I am assuming the x2 and x4 are the number of winds? What exactly are these numbers? I have seen motors with from say 10 to 18 turns, and they are all the same price (same make/model, just different turn #). I was looking at something simular to this motor; http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJSS9&P=0 I am more then likely not going to be purchasing from this company (cross boarder shopping will put me over the budget), but found that this site appears to have the most info I could find on the components. All i know is the lower the number of turns the faster the motor. as for the double, x2 etc that seems to help the characteristics. For example my 27x2 runs a lot smoother through the rev range. i.e the power output is the same just the speed changes with the revs. So i think therefore it has a wide torque band or powerband. Before you buy the motor make sure your esc can cope. They are rated by turns too. However those ratings are a bit generous. the lrp ai runner is said to do 15 turns yet i've seen a 27 trinity cobalt prove too much for it. oh yeah, its not as easy as it looks, if its a circuit no bigger than a basket ball court 19turn x2 is more than enough. in fact a well sorted 27 turn will produce 30mph. On Mar 5, 8:25 am, "ian" <r.linc...@ntlworld.com> wrote: > "mike" <mlawr...@gmail.com> wrote in message > [quoted text clipped - 53 lines] > turn superstock, 17 turn very fast. 12 turn F£"k me! oh yeah x2 or x4 > after the number of turns means more speed too. You mentioned X number of turns and I am assuming the x2 and x4 are the number of winds? What exactly are these numbers? I have seen motors with from say 10 to 18 turns, and they are all the same price (same make/model, just different turn #). I was looking at something simular to this motor; http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJSS9&P=0 I am more then likely not going to be purchasing from this company (cross boarder shopping will put me over the budget), but found that this site appears to have the most info I could find on the components. Mike mlawrenc(at)gmail.com ____________________________________________________ Mike How about posting up some pictures of the car you bought (of the electronics inside, motor and chassis mainly). I was unable to find any information about it. Also put up some specs on the dimensions of the motor, diameter and length and the volts and capacity of the battery pack. Is this challenge you are doing a mechanical or electrical engineering challenge? And is everyone using the same car and applying their own mods to them? > How about posting up some pictures of the car you bought (of the electronics > inside, motor and chassis mainly). I was unable to find any information [quoted text clipped - 6 lines] > challenge? And is everyone using the same car and applying their own mods > to them?- Hide quoted text - I will post some pictures of car and the specs soon. Everyone that is racing is limited to what they can purchase for $40CND or less. Basically, take a bottom of the line RC car, and get creative. (Max $150CND before taxes, including car and mods.) This is simply a challenge for those of us that are not able or willing to dish out the big $$, but still want to race. Most of the people racing have some sort of engineering paper (everything from Machanical, electrical, civil, etc). Mike |
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