My drive wheel is going to be 9" in diameter. Don't know if that helps. I'm not sure about the length of my track though. I'd like to somehow figure out how fast my tank will be.
I used this calculator but not sure if wheeled vehicles and tracked vehicles share the same math. http://wahiduddin.net/calc/calc_speed_rpm.htm I put 100 as my RPM 1:1 for both gear ratios and 9" for tire. The calculation was 5.4mph which is approx 8.6kph but once again this is a tracked vehicle so I'm not sure if the same rule applies. On Mar 2, 7:48 pm, George Mastoras <[email protected]> wrote: > Motor no load speed is 5500, gear ratio is 12:1. > > I was aiming at 400 rpm for regular use, based on the rule of fours a bit. > > The only other factor is the size of your drive wheel with the track on. > If your drive wheel is twice as large then you would only need half the rpm. > > On 3/3/09 2:27 PM, "Tango71" <[email protected]> wrote: > > > > > So what is the shaft RPM of those motors then? and what is the > > gearing. Reason I ask is that I would like to get a bit more speed out > > of my Tiger but my wheelchair motors at 24v only give me about 110RPM > > They are all torque though so I may be able to gear them up a bit. > > > On Mar 2, 5:58 pm, George Mastoras <[email protected]> wrote: > >> The wheel rpm is about 400 - 450 in theory. > >> I worked out the speed by counting the track rotations from the video. > > >> Here is the maths I used > > >> 1.5 meters track length > >> 54 turns per minute > >> 54 x 1.5 = 81 meters per minute > >> 6o minutes p hour 81 x 60 = 4.860 KPH > > >> under load 51 turns 76.5 > >> 76.5 x 60 = 4.59 KPH > > >> Trying to work out what speed it needs to run to look scale. > >> 72kph at 1/10th scale is I think 7.2kph?? Maybe. If that's the case I am > >> too > >> slow but somethings out somewhere I think. > > >> George > > >> On 3/3/09 12:28 PM, "Tango71" <[email protected]> wrote: > > >>> Got a question. What is the total wheel RPM at full speed? That looked > >>> a lot faster than 5kph. > > >>> On Mar 2, 8:07 am, George Mastoras <[email protected]> wrote: > >>>> Finished the final 8 wheels yesterday. In the evening decided as a break > >>>> from the extreme boredom of grinding down plastic wheels to give it a run > >>>> for a few minutes with freshly charged batteries. At the last minute > >>>> grabbed > >>>> the video camera. > > >>>> I was only going to let it run but as I saw a nut fall off the wheel I > >>>> decided to push down onto it and test other things as well. > >>>> From doing this video have learnt that it will do 5KPH without slowing > >>>> down > >>>> much, probably over most terrain and angles. I was putting a bit of force > >>>> on > >>>> and only one side was being tested at a time. > > >>>> This was only going to be seen by me so a few bad habits being shown, > >>>> sticking motor wires into battery connectors while holding onto a vehicle > >>>> probably isn¹t a good practice. > > >>>> George > > >>>>http://www.youtube.com/watch?v=bksbHnxaARA&feature=channel_page > > --~--~---------~--~----~------------~-------~--~----~ You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat -~----------~----~----~----~------~----~------~--~---
