1/6 scale rock racer

[trynacrawl]

Tht 1:1 is SICK!!!!! Your truck is going to look great if it it looks anything like that!!!

[cruiserkb]

Originally Posted by trynacrawl

Tht 1:1 is SICK!!!!! Your truck is going to look great if it it looks anything like that!!!

Thanks.
I am not sure if I will go with the exact pannels. I might want to change the color or something. Dont know yet. I will have to see once I get it closer to completion.

[cruiserkb]

I need some help on a gearing queston for this.

I am wondering if any one would know what the best pinnion gear to get if I am running a 28 tooth gear on an output shaft? I have talked to Traxxas and they gave me a ratio of 37:13 for both the front and rear diff's. I am thinking of running a dual HH puller motor setup. I don't know much about the gearing aspect of RC's yet, and just need a little guidance.

Thanks in advance for any help!

[gadge]

which transmission are you using? HH pullers are 1834 rpm/volt..5 to 10 volts...how much u gonna run?...28 tooth pinion?
i would work from both ends,math wise
tire dia x 3.14=rollout or circumferance
if u know top speed..mph,convert to in/min
then divide rollout into distance /time for a guess at rpm at top speed
divide by axle ratio (2.84 in your case)
divide be trans ratio
now u got required trans input rpm
rpm of motor (at max rpm) to rpm of trans (required input rpm)
these two numbers will be a ratio...required ratio of pinion to spur
then find the ratio on a "ratio chart" or make your own
and presto...pinion and spur!
if you give more info i'll be glad to help
G

[47willysbuggy]

Originally Posted by gadge

which transmission are you using? HH pullers are 1834 rpm/volt..5 to 10 volts...how much u gonna run?...28 tooth pinion?
i would work from both ends,math wise
tire dia x 3.14=rollout or circumferance
if u know top speed..mph,convert to in/min
then divide rollout into distance /time for a guess at rpm at top speed
divide by axle ratio (2.84 in your case)
divide be trans ratio
now u got required trans input rpm
rpm of motor (at max rpm) to rpm of trans (required input rpm)
these two numbers will be a ratio...required ratio of pinion to spur
then find the ratio on a "ratio chart" or make your own
and presto...pinion and spur!
if you give more info i'll be glad to help
G

[gadge]

..........
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...................love that reply!!!!!!!!!!

[RobCam]

subscribed!

[RobCam]

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[cruiserkb]

RobCam double subsciption, I hope that I can meet your expectations.

I got a few more progress pic's today. All I can say is that ecoli is doing one H%LL of a job on this, can't say enough good things about his work. I will let the pic's do the talking:

[gadge]

ok so been p/m ing with kev bout our 1/6 rock racin rigs
but i thought everyone would appreciate the math for overall gearing / top speed
>to start with tire dia.....8.26" in this case X 3.14 to give you the distance of one revolution.........which is 25.9" in this case
now we take the axle ratio of 2.84:1....so 25.9" divided by 2.84 =9.13" per 1 revolution of the driveshaft
>now the other end of the drivetrain the motor(s)
10T HH pullers with 1700rpm/volt run on a 3s lipo(full charge of 12+v but we can use this for example)so 1700 x 12 =20,400rpm
>now we can take the max rpm x "/rev which =186,252 inches per min
ok we can cheat and skip the conversion and use this
http://www.onlineconversion.com/speed_all.htm
and plug in that big number into inches/min and convert to miles/hourand get
175.375 miles per hour and thats what you will have IF you tried going direct drive.....that will never work but heres the easy part now
>ok so we got 175mph and you want a top speed of say 35mph just divide the two and in this case end up with exactly 5.00 :1
>say you want crawler speed say a top speed of 15..175/15=11.666:1 overall
>if you have a transmission that you are using you can figure out the pinion/spur ratio off of this number also
>we'll use a easy number first like the first one...5.00:1
>and a simple trans ratio of say 3.00:1 5/3 =1.666 thats the pinion and spur ratio needed

[cruiserkb]

Originally Posted by gadge

ok so been p/m ing with kev bout our 1/6 rock racin rigs
but i thought everyone would appreciate the math for overall gearing / top speed
>to start with tire dia.....8.26" in this case X 3.14 to give you the distance of one revolution.........which is 25.9" in this case
now we take the axle ratio of 2.84:1....so 25.9" divided by 2.84 =9.13" per 1 revolution of the driveshaft
>now the other end of the drivetrain the motor(s)
10T HH pullers with 1700rpm/volt run on a 3s lipo(full charge of 12+v but we can use this for example)so 1700 x 12 =20,400rpm
>now we can take the max rpm x "/rev which =186,252 inches per min
ok we can cheat and skip the conversion and use this
http://www.onlineconversion.com/speed_all.htm
and plug in that big number into inches/min and convert to miles/hourand get
175.375 miles per hour and thats what you will have IF you tried going direct drive.....that will never work but heres the easy part now
>ok so we got 175mph and you want a top speed of say 35mph just divide the two and in this case end up with exactly 5.00 :1
>say you want crawler speed say a top speed of 15..175/15=11.666:1 overall
>if you have a transmission that you are using you can figure out the pinion/spur ratio off of this number also
>we'll use a easy number first like the first one...5.00:1
>and a simple trans ratio of say 3.00:1 5/3 =1.666 thats the pinion and spur ratio needed

Wow gadge you are the numbers man!!! Thanks for the info and now I have some numbers to shoot for.

[skin6061]

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[JasonInAugusta]

Originally Posted by cruiserkb

I need some help on a gearing queston for this.

I am wondering if any one would know what the best pinnion gear to get if I am running a 28 tooth gear on an output shaft? I have talked to Traxxas and they gave me a ratio of 37:13 for both the front and rear diff's. I am thinking of running a dual HH puller motor setup. I don't know much about the gearing aspect of RC's yet, and just need a little guidance.

Thanks in advance for any help!

I'm running a HH 7t puller in my 1:6 Campbell buggy with a Monster Max, 2S lipo, and E-Maxx tranny into TXT axles.

I like the speed of 2nd gear, but like the slow performance in 1st gear too.

I can get air in 2nd (about a wheelbase worth) but nothing spectacular.

I'm debating going with a brushless inrunner.

I'm fairly postive I have a Hacker C50-7XL here somewhere, I just don't think the TXT axles would like that too well.

[gadge]

Originally Posted by JasonInAugusta

I'm running a HH 7t puller in my 1:6 Campbell buggy with a Monster Max, 2S lipo, and E-Maxx tranny into TXT axles.

I like the speed of 2nd gear, but like the slow performance in 1st gear too.

I can get air in 2nd (about a wheelbase worth) but nothing spectacular.

I'm debating going with a brushless inrunner.

I'm fairly postive I have a Hacker C50-7XL here somewhere, I just don't think the TXT axles would like that too well.

>>what are using for pinions and spur
just a sugestion ...if you can stand to loose a little low end to gain on the top end

[cruiserkb]

Originally Posted by JasonInAugusta

I'm running a HH 7t puller in my 1:6 Campbell buggy with a Monster Max, 2S lipo, and E-Maxx tranny into TXT axles.

I like the speed of 2nd gear, but like the slow performance in 1st gear too.

I can get air in 2nd (about a wheelbase worth) but nothing spectacular.

I'm debating going with a brushless inrunner.

I'm fairly postive I have a Hacker C50-7XL here somewhere, I just don't think the TXT axles would like that too well.

I have studied your build in great detail and I have to admit that it was a big factor when I decided to build mine this scale. That rig has set the mark for what I hope to accomplish with mine. I had seen it sitting on a shelf disassembled in the background of some of your pic's and hoped to see it running again. I think you made a wise decision to get it back running. I hope we can see some video in the near future, so I will be following your thread in anticipation.

Thanks for the interest everyone, and a little birdie ( ecoli ) told me that the chassis is complete so pic's should be up soon.

[cruiserkb]

Here is a teaser shot, more to come soon!

[Jester666]

Wow that is awesome! Chris does some great work.
It looks like the Piglet may have someone to run against now, LOL.

[C*H*U*D]

Looking great!! Just how big is this thing? Can you put something in the picture to show some scale? A beer would be a good reference.

[cruiserkb]

Originally Posted by C*H*U*D

Looking great!! Just how big is this thing? Can you put something in the picture to show some scale? A beer would be a good reference.

I don't have the frame in hand yet, but maybe ecoli can post up one with something for reference. The motor that is in the rear is a 1/6 scale liberty classic measuring about 6" in length and 5" in width. That might give you and idea of scale.

[jeepcreep]

in which case. that motor is bigger than your average beer can
but i don't drink beer...
7-UP! It is bigger than a can of 7-UP:-P

great job on the chassis ecoli. It is a real squealer.