Run with it, Derek. We'll be watching... Paul H. ----- Original Message ----- From: Derek Engelhaupt To: [email protected] Sent: Sunday, October 25, 2009 4:10 PM Subject: [TANKS] Re: Differentials
Now that the family and I are back from the Caribbean, I can add my two cents. I bought a couple of riding scooter (type used for people that have difficulty walking) differentials to play with. They are a limited slip type with a single motor. They are heavy (15lbs/per differential), but I think the heaviness could aide in traction for a battle vehicle. I was going to play with a seesaw type of suspension and use two of them on a vehicle so I could get 4 wheel drive. I do agree that the complexity of the steering and suspension of a wheeled vehicle is more daunting that actually creating a tracked vehicle. In order to steer the vehicle, I would need to make one of those heavy duty steering servos using a geared motor and a standard r/c servo. Building a wheeled vehicle is pretty low on my list of projects though. Derek T065 On Wed, Oct 21, 2009 at 10:02 AM, Doug Conn <[email protected]> wrote: We talked about self-propelled lawnmower differentials like the ones they sell at Surplus Center. It turns out that they cannot go in reverse with some mechanical modifications. - Doug From: [email protected] [mailto:[email protected]] On Behalf Of mac wynkoop Sent: Tuesday, October 20, 2009 6:25 PM To: [email protected] Subject: [TANKS] Re: Differentials Well, not too long ago I saw a differential on my neighbor's self-propelled lawn mower. It looked like it would fit a tank perfectly. Maybe I should ask him if he wouldn't mind pushing it again... On Tue, Oct 20, 2009 at 12:26 PM, Steve Tyng <[email protected]> wrote: I have given the subject of differentials in a 1:6 scale r/c combat vehicles some thought over the years. At one point I was interested in building an armored car (AC) and may still do so. I looked at the various differentials currently available and have yet to find one that I feel is appropriate for our vehicles. On the heavy end are the differentials built for go-karts. These are to large for a typical 1:6 scale AC and have monster 3/4" or 1" output shafts. On the other end of the spectrum are the hobby differentials produced for "monster" scale r/c trucks. I've looked at these and weren't impressed with there robustness and many plastic parts. I have seen references to differentials for 1/4 scale r/c sand buggy's that sounded good but they were on a German site with little info and the pricing looked to be exorbitant. IMO the best option will be a dual motor setup (or quad motors for 4wd) driven from one speed controller. This "electronic" differential provides the same functionality as a mechanical one in that it provides varying power to the left or right drive wheels depending on load. It can be built as robust as required much as we build our drive-trains currently. The issue will be finding the appropriate motors for such a scheme. The motors will need to be relatively powerful and small to fit into the smaller chassis. For this all we need to do is look to the new electric skateboard sport where small high-powered motors of up to 600 watts can be found. While on Allellectonics.com the other day I noted a nice 135 watt motor that that I have seen used on electric skateboards and may prove to be ideal for the smaller wheeled r/c combat vehicle. http://www.allelectronics.com/make-a-store/item/DCM-130/24VDC-135W-MOTOR-W/-BELT-GEAR/1.html If I were to start building an AC tomorrow I'd get two of these motors and a single reversing scooter controller and design an AC around that. Steve Tyng --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
