my home made car!!!
 

i have started making my xxx4 in to 3x3 cell car, it is made out of thin alliminuim at the moment for a prototype but if works i will hopefully have access to the cnc machine at my school to mill it out properly with carbon fibre so it is a perfect fit, lol. only the rear is fixed at the moment and i have only cut 4 cell slots out because its really boring doing them all in one go. it will be 4 cells each side so i can adjust the weight distibution. i am also planning on making a chassis the same as this but a different cell layout with 2 cells the side of the motor and 4 the other side like the slim 4 (if i am aloud?) i have got to make the top deck yet what will hopefully be carbon fibre on the finished product. Any ideas?? i also need a name for it and my last name is pretty boring so cant use that!!!

ryN

nice work pipe
 

i heard that 4 cell one side and two motor side provides the optimun balance and why dont u call it xxx4 no more

i might cut 4 slots each side so i can test and layout but i might make a new chassis and turn the cells 90 degrees.

ryan

No ideas, sorry.

Keep the pics coming though, some people do this sort of thing and think they are some sort of hot-shot, pretending it's all a big secret.

dont worry ill keep you all informed. lol

I always got on good with my XXX4, I rekon you've gotta be Trickey or Ellis Stafford types to really say the XX4 is that much better.
I'll go back to XXX4 for this winter, I think it's a cool car.
Last two years I've been F2 from nationals, but, after running the XX4 all this year I'm now back at F3, whats that tell me?

It tells you to put down your camera and concentrate on the racing ? ?? :p

you KNOW im talking the truth there stu, I have had my worst season ever and am dropping a grade also - I blame it on taking photos.

Maybe.

but dont stop taking photos!!!!!!

jimmy its up to you what you choose, as long as you still take some pics!

Kev

But... you didn't do enough regionals to GET a grade... so its not like you're actually worse or anything..!

Jimmy, or Me - or both?

No problem Ryan, to be honest if looking at what i have done with the Slim4 gets more people to modify cars and try new things thats great, as we all win by moving car design forwards. ;)

I meant Jimmy... I don't know about you ;)

:)
Good.

emz, look at my nationals, ive been down at the bottom all year..

Batley and Tiverton!

i like the idea so far, very interesting! i think you will have to turn the motor mount around though, or you will have to run the motor backwards.

i put the motor around that way so it didnt intefere with the servo i had to move the servo about 7mm to the right so the motor would move forward. so it would be quite hard to put the servo on the left. Would it effect the motor running it backwards, would it still be able to reach top speed?

ryan

you would loose around 5,000 rpm and also make it almost impossible to run brushless motors in it.

try VERY hard to get the motor to function in its normal way.

why can't you just swap the motor for servo?

How does that work :confused:

If you flip the endbell 180 degrees the motor has the same characteristics but spins the other way... what am I missing :study:

you not missing anything, but in practise Ellis found that he did loose a few 1,000 rpm.

strange but true?

actually, you should not flip it 180 degrees, if you had (for example) 5 degree timing, you would rotate it 170 degrees in the direction of the timing

the windings are reversed, so it would alter the way the magnetic feild is generated in the winding and relation to the magnet.

Wierd :confused:

I was always told that you shouldn't run a modified motor backwards and this was the reason why powerfull esc had brakes and not reverse...
I'm probably totally wrong on that though...:smile:

looks like ill have to turn it round!!! dont want it going slow!!!

ryan

I would go with this theory, it seems like a reasonable explaination

The reason for not having reverse is that the timing does funny things when in reverse.

If rou asked really nicely you may be able to get someone like Glyn to wind you a motor designed to run 'backwards'.

the motors round the other way now and the belt and diffs are all in. i get some pics up later.

ryan

See, told you I was probably wrong!!

i just need to make the top deck and cut out the last 4 cell slots now and then hopefully completed and after installing electrics ill take it around the track in my garden!!!:D


ryan

has the wheelbase changed at all with the new chassis? it may be a funny angle on the picture but the car looks quite shorter than a standard xxx4.

anuffer question..

what are you planning to do for a shell/undertray?

car looks like it could be a winner!

I built a 4wd last year based on a xxx4 tranny. it was thinner than my Durango and the cells placed in the centre also the motor and servo and it balanced from left to right and front to back and ran 100% reliably the best thing was that it jumped amazingly and was very quick the second we ran it
ED KERRY run it at our track D.H.D racing/Xtreme RC and wanted to use it

well isay xxx4 tranny just the diffs and belt the lay shaft and clutch was mine
also tranny was sealed and made of carbon.
Just a bit of fun , it got nicknamed the flying sausage:D

good on, you keep it up! after all its good for the sport and very much fun

ps theres a thread on rcracechat called (anyone making any secret projects) they might like a look;)
my home made 2wd pics are on there also on there:)

my bro has an industrial vacuum former at xtreme rc if you need a shell send me the mould and i will see what we can do

well done

thanks paul, the wheels base is exactly the same as the stadard xxx4. i have currently fitted the standard xxx4 body but the motor lump is in the wrong place and where the motor is now BRING ON THE DREMMEL!!!!!!!!!!!! lol. i also have access to a vaccum former but i dont think it will be big enough, does any one now how to mold bodys. the body is a further in the future at the moment though because i want to change cell layout which jonathon advised me on.(thank you Mr slim)


ryan

thanks scott, i think i am definetly going to try and make it slimmer, ive been playing with some ideas in my head and the slimmest way is like this:

II Belt II
I Belt I
Motor

I= 1 cell

lol like my explanations?? the chassis will be quite thin then, i want to test this for the moment and use some thicker alliminuim and try a chassis like above. i want to test the car somewhere in the winter like this.

ryan

EDIT: when i post it moves all the letters to the right so the explanation isn't how it will look!!!

Ryan worth checking to see if say a saddle pack can go on top of the lower belt without touching it ? difficult to explain.

it just catches the cell so ill have to leave a small gap.:(

ryan

Shame, would of been good to run the cells long ways in 3's. I guess the 2+2 then 1+1 way as you have said then.