With these motors and 4-5mph, you will not have a problem with climbing. I have 350w 24v in T067 with about 5mph, and there is heaps of torque, and it weighs about 200lbs.
Ben -----Original Message----- From: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Cobra9431 Sent: Thursday, 1 April 2010 10:52 AM To: R/C Tank Combat Subject: [TANKS] Re: new to the hobby, need motors Thanks, this all helps. I dont have much room inside to have an elabrate system of sprockets and wheels to gear everything down. I do want a high speed tank to compliment one of the few truely superb points of the WWII Sherman, it was generaly faster than any Gerry or Ivan unit. But I dont want to give up climbing power for hills or tall brush. Anyways, like I said, Thanks. Aaron T0?? On Mar 31, 4:32 pm, Derek Engelhaupt <tan...@gmail.com> wrote: > Joe's rule of 4's.... > > I recommend the *Rule* of *Fours* > > > 4 inch DIA drive sprockets > > 400 rpm no load speed at each drive sprocket > > 400 in.lbf stall torque at each drive sprocket > > 4 mph with sufficient torque for full-skid steer > > I use Victor ESC's and have the brake function disabled. It's not > needed as Ben pointed out. My tanks stop on their own due to rolling > resistance. I have never built a tank and actually calculated the > final speed. All of the motors I've used have been in the 400RPM > range so whatever speed comes out in the end, so be it. > > Derek > T065 > > > > On Wed, Mar 31, 2010 at 5:08 PM, Ben Holko <b...@holnet.net> wrote: > > Victor ESC's have an electronic brake feature, switchable on/off by > > a small jumper. I think most people (including me) have left it > > turned off as it seems to be rather a violent stop from 5+mph, and > > these tanks typically have enough weight and rolling resistance to stop > > themselves. > > > 300-400 should be fine for your final motor drive. If by final drive > > you are referring to track sprocket rpm, then it might be a bit high > > depending on how big your track sprocket is. > > > If you have a 4" track sprocket, that is a circumference of > > (rounded) 12", with a an RPM of 400 on this sprocket that is about > > 4.7mph > > > The way I build is to sort out my track sprocket and the speed I > > want to achieve, and work back from there with motor/drive sprockets > > to suit. So geared motor output speed of 300-400 is in the ball > > park, and you can fine tune with the sprocket on your driveshaft if > > necessary. > > > Ben > > > -----Original Message----- > > From: rctankcombat@googlegroups.com > > [mailto:rctankcom...@googlegroups.com] > > On Behalf Of Cobra9431 > > Sent: Thursday, 1 April 2010 8:19 AM > > To: R/C Tank Combat > > Subject: [TANKS] Re: new to the hobby, need motors > > > So, is 400 about the ballpark that should be aiming at for a final > > dive rpm ? > > > Aaron > > T0?? > > > On Mar 30, 8:13 pm, Derek Engelhaupt <tan...@gmail.com> wrote: > > > Most definitely running at 24V.... I'm using the same ones Mark is > > > using in my KV-2 also which will be in the 110-130lbs. range. If > > > you wanted to gear them down a little, use a larger than 9 tooth > > > sprocket on > > the final drives. > > > You can see the basic speed of the motors > > > here:http://www.youtube.com/watch?v=d7dfrddGMOIBear in mind that > > > it > > will be somewhat slower since my M113 only weighs in at about 50lbs. > > in that vid. > > > > Derek > > > T065 > > > -- > > You are currently subscribed to the "R/C Tank Combat" group. > > To post a message, send email to rctankcombat@googlegroups.com To > > unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com > > Visit the group athttp://groups.google.com/group/rctankcombat > > > To unsubscribe, reply using "remove me" as the subject. > > > -- > > You are currently subscribed to the "R/C Tank Combat" group. > > To post a message, send email to rctankcombat@googlegroups.com To > > unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com > > Visit the group athttp://groups.google.com/group/rctankcombat- Hide > > quoted text - > > - Show quoted text - -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
