my home made car!!! - Page 2

Richard Lowe · #21 14-09-2006

Quote:

Originally Posted by DoughtyUK.net

you would loose around 5,000 rpm

How does that work

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

Chris Doughty · #22 14-09-2006

Quote:

Originally Posted by Richard Lowe

How does that work

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

DCM · #23 14-09-2006

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

Richard Lowe · #24 14-09-2006

Quote:

Originally Posted by DoughtyUK.net

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

strange but true?

Wierd

Col · #25 14-09-2006

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:

ryan · #26 14-09-2006

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

ryan

Chris Doughty · #27 14-09-2006

Quote:

Originally Posted by DCM

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

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

DCM · #28 14-09-2006

Quote:

Originally Posted by Col

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:

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

Stu · #29 14-09-2006

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

ryan · #30 14-09-2006

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

ryan

Col · #31 14-09-2006

Quote:

Originally Posted by DCM

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

See, told you I was probably wrong!!

ryan · #32 14-09-2006

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!!!

ryan

PaulRotheram · #33 14-09-2006

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.

PaulRotheram · #34 14-09-2006

anuffer question..

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

car looks like it could be a winner!

SCOTT DICKINSON · #35 14-09-2006

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

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

ryan · #36 14-09-2006

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

ryan · #37 14-09-2006

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!!!

OldTimer · #38 14-09-2006

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

ryan · #39 14-09-2006

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

ryan

OldTimer · #40 14-09-2006

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.