a few questions about large scale rc-tanks.

[sjefke1993]

hmmm, alright, so do you happen to know where i can find some dedicated speed controllers for 24v?

[[ICE]monkey]

I got mine here, 2 controllers plus the interface
http://www.4qd.co.uk/

[Johnf]

Scale it to whatever scale fits. I would measure the with of say a doorway snd work out what scale up is required to scale up the kit to that width. Once you have the scale % increase worked out you can copy lots of the parts with a scanner and increase the size by that percentage to print. I expect it will be expensive. You could go for a landraider. Moch simpler. Cannot even see the wheels on that. Forge world did some larger scale figures which would make great crew.

[[ICE]monkey]

This might give you a few ideas

http://www.rctankwarfare.co.uk/forums/v ... =33&t=9308

[jdflute]

250watt motors will be more than enough for that size but you could use geared motors rather than having a separate gear box, look around for speed controllers and other components on robot building sites. http://www.robotcombat.com/store.html
Tracks and drive sprockets will be one of the most expensive items, have a look at this how to http://www.rctankcombat.com/articles/track-systems/ and intralox make plastic conveyor belts that are good for tracks http://www.intralox.com/hLaunch_nd-nag-eu3.aspx?id=2014
I use a sabertooth esc myself from dimension engineering http://www.dimensionengineering.com/pro ... rtooth2x25
with two 24v 250w geared motors, and tracks from Kenny Kong http://www.kennysmodeltank.com

http://www.rctankwarfare.co.uk/forums/v ... 8&start=20
RC Armory were alsovery helpful so you might try them as well http://www.rcarmory.com/links.html

Jd

[Storky]

Hi

I am building a 1/8th Scale M26 Pershing tank, and I have used 2 of the motors that you have indicated above. You will need to gear them down to an 11:1 ratio or there abouts, or you will not get any torque for turning the tank. Especially on grass etc.

I have used a simple gearing system using sprockets and chains.

Photo-0020.jpg (11.58 KiB) Viewed 4549 times

I am also using a Sabretooth 2 X 25 speed controller. This has built in mixing, so you can drive your tank with just one stick on the transmitter.

It is made by Dimension Engineering in America.

Hope this helps

Phil

[sjefke1993]

awesome, thanks phil, i noticed that you bought the same motors i wanted to, how would i go about mounting a drive sprocket on it? is it something that's easy to do, or did you need to weld something?

as for starting this build, this week im finishing up the last week of school, so after that im going to start drawing up some plans and start building it, expect a topic sometime around that :p

[Storky]

Hi

The sprockets that come with he motors have an unusual pitch, So are not much use. I took them off and bought small 9 tooth sprockets, which I drilled a 4mm hole through them and the motor shafts. I then hammered (Gently) a 4mm roll pin through the sprockets and shafts. If you put some thread-lock on the pins, it will stop them from gradually working their way out. The bigger sprockets are 40 tooth sprockets from Technobots http://www.technobotsonline.com/sprocke ... ckets.html. Just make sure that you buy all the sprockets and chain with the same pitch. The bigger sprockets were drilled and tapped to take an M6 grub screw that tightens down onto flats that I filed into the shafts. Again, I used thread-lock to stop them from undoing in use. The sprocket on the rear drive axle is a 27 tooth sprocket.

These motors run fine on 12V, using a 12V, 22aH golf cart battery. Giving you a reasonable speed. I have just upgraded to 2X 12V 22aH batteries wired in series to give me 24V in total. This goes through the Sabretooth speed controller. I have also taken a 12V feed from one of the batteries to power the heater element of my smoker via a switch under the drivers hatch. The fan is fed from the motor wires to give me a variable speed to produce a faster flow of smoke as I increase the tanks speed.

Hope this has given you a few ideas.

Phil

[sjefke1993]

aight, thanks storky, been alot of help ^^

Now that im starting to plan stuff more detailed, does anyone happen to have any Tiger I or Panther blueprints (doesn't really matter what type)

aswell as perhaps some sort of tutorial about the whole control systems for beginners? might be alot to ask but can't hurt to, right?

[Storky]

Hi

I have a 1/16th Heng Long M26 Pershing tank. So, I just measured all the details etc from that, and then doubled it, and applied them to my 1/8th build. You could buy a model of the tank that you want to build and just scale it up to 1/8th.
Phil