csicso

Hi everybody!

I'am new here (just registered), but I'd like to introduce my building project called Mammuth. This will be an ~1/4 scale trophy truck, based a pocket quad. It has pocket quad wheels and engine. We've planned a custom frame and suspension. All of the informations (pictures, videos)about the car is on the cars blog: www.csicso.com/index.php/mammuth-english/



I'll try to keep this topic up to date

Hope you like it!

csicso

Just for the taste, here is a picture about it:



And some other:

dc2 man

very nice man i like it.......

i cant wait to see the finished product. what size engine and pipe you planning on putting in there?

nice!

csicso

It has the pocket quad's engine: 49cc 2 stroke (with tuning carburetor and air filter in the future). The pipe also the quad's factory pipe...

dc2 man

is it something like this quad i got for my son for christmas?

if you scroll down the bottom you will see pics of it. they come with a decent pipe and engine actually,why didnt you use quad frame also? i suppose that would take the fun out of it lol

http://www.rcuniverse.com/forum/m_91...12/key_/tm.htm

csicso

Yeah exactly! That's the same chineese quad with different wheels.

"why didnt you use quad frame also?"
Because we planned a custom frame with custom suspension and shocks... and my favorite cars are the trophy trucks

dc2 man

nice one man.....they are a fine engine and pipe,when my son isnt looking im going to rob the exhaust from it

the engine is a 4 bolt.....dont know the make though.

it looks good man,what servos are you planning on using?

csicso

I've buyed4 TowerPro 9805BB servos (25kg @ 6V), I know it's also chineese, but for this price I must to try these...Two servo for steering and one for throttle / brake... Ihope they will be good enough...

dc2 man

any pics of the sevos?

threy would have to be strong i would imagine at that size anyway,you would defo need two for steering...


any ideas on tank and any diff?? chain or gear drive?

csicso

You found everything on the blog Even the servos
We've leaved the chain drive, the tank also the quad's factory tank

dc2 man

cool

yeah i checked blog but cant find pics

csicso

Here is the post: www.csicso.com/index.php/mammuth-english/servos

dc2 man

sorry man but i tested servos similar to those last summer BUT mine were a little better,i think they lasted a tank of fuel


just my opinion here but if i were you i would go for something better.they will fail fast.......


but why not try eh?

csicso

Yeah, it's just a try... We'll see how they works. I hope longer then a tank of fuel What kind of problems do you have? Similar or exactly these servos?

dc2 man

yeah they were very cheap so why not try......

but the danger is they could stick in any direction,the problems were they just stop......i was racing a new nutech onroad car and they just stopped sudden with no warning,ok so i exagerated maybe 2-3 tanks of fuel but not great,


i had 4 of them one stuck on full throttle due to plastic gears stripping its threads so the car just kept going lucky for me i was able to stop it before any major damage.

the problem you will find is

1/ if gears stay ok for a while the motor just STOPS without warning!

2/ if motor stays working,gears will strip along with casings cracking due to hard plastics used to build them.

but you could be lucky,be carefull with them though for your own sake,that machine will be heavy and you wont want it sticking on full throttle after using a 15usd servo......


my servos were even a little better looking and more expensive than yours but were still total rubbish @ 40euros each....

now i use ONLY good hitec 5745

<form name="take" method="post" action="http://www.rc-car-online-shop.de/cgi-bin/cosmoshop/lshop.cgi"> The new version with bigger heat sink and triple ball bearings. Suitable for installation on steering or throttle/brake applications. These servos combine excellent performance with high reliability. This servo is the first choice of many top drivers. Metal gears, ball bearings and heavy gauge cables are natural. An alloy servo horn is included. Many important parameters of these servos can be programmed with an optional available programming device. speed: 0,15 sec/60° torque: 180Ncm </form>

csicso

Thanks for your help, but now I need to sleep a little Tomorrow I'll check the Hitec servo...

dc2 man

no hassle man...

good to help,im intrested in your project.

the hitecs are very relibale and not too expensive......obviously you could get better but would cost a lot more.

all the best man..

csicso

Last night I can't sleep I've been thinking about the servos... You've right. I put these TowerPro servos only for test run (no high speed, no hard bashing ), into the carburetor there is a spring on the throttle cable, it works as a manual "fail safe".
After some tests, I'll replace the servos:
For steering: 1 Tonegawa PS-050
For throttle / brake: 1 Brand (Futaba, Hitec, etc.) Servo ~15kg @ 6V, I didn't choosed yet.

After these modifications I can safely drive the car on high speeds... Thanks for you help!

Dirty_Vinylpusher

Seen this on YouTube.
Looks very promising.

csicso

Thanks a lot

dc2 man

good for you.
i think the servos are the first important upgrade,after that the world is your oyster.........

tonystott

You shouldn't really run it unless you have fitted a killswitch failsafe. This will cut the motor in any of the following scenarios:-
Car goes out of range
Transmitter fails
Receiver fails (eg no signal for whatever reason)
Servo fails (you flick a switch on the Tx to kill the motor)
Power stops reaching the receiver (could be flat battery, bad connection, or even broken in an impact)
You simply turn off the Tx momentarily

Added bonus is that the motor will not start unless the radio (tx AND Rx) are both on and working - a good security feature no chance of an accidental start...

these things are so cheap you really shouldn't avoid one for a second.

csicso

Thanks man the informations, I also have a fail safe on my Tomahawk buggy, the Mammuth will have one too... Later we're planning a custom radio control system based on custom 2.4Ghz transceivers (those have built in error checking and ping functions)and RoBoard x86 PC, you canread about it here:http://www.csicso.com/index.php/mamm...custom-control

Bye

csicso

Today, I made a picture about the car:


The engine is not fitted yet, just placed in the frame... The rear frame and and the axle is finished. Very heavy

quarterscalelegends

looks really good so far!