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Thread: MPH Challenge

  1. #1
    RC Turnbuckle Jr. Snook Man's Avatar
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    MPH Challenge

    A buddy and I were having a discussion about RCís in general and the age old debate between Nitro and electric came up. Long story short, he challenged me to build a Nitro powered RC that can hit the 100 mph mark.
    I know it will be a tough task but the wheels in my head are already spinning.
    It will be nothing like a Tmaxx but I do intend to use the Maxx rear end and transmission (with some modifications).

    I need to do a little research about length and width for stability before I begin to think about making the chassis but this is something like I have in mind.

    Thereís no limit on engine size or distance, just hit 100 mph verified with gps.
    Probably a little in over my head but I couldnít resist.

    Wish me luckÖ
    No slipper/tall gearing/power = broken parts.

  2. #2
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    Cool Snook, I couldn't even imagine a nitro hitting 100, but if anybody could, it'd be you. Can't wait to see what this ends up as. Good luck.

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    Quote Originally Posted by rcdriver5 View Post
    Cool Snook, I couldn't even imagine a nitro hitting 100, but if anybody could, it'd be you. Can't wait to see what this ends up as. Good luck.
    It can be be done. I have a stock 1/10 scale stadium truck that will do 70mph, 80 with a clutch bell change.
    It's a matter of power to weight ratio, gear ratios and areodynamics.
    Cool project to say the least.
    My Karma runneth over your Dogma.

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    it deffinately can be done.. my nitro rustler can hit 88 with a 3.3 and a spur/cb change
    road rage its not just drivin its a blood sport

  5. #5
    Marshal Double G's Avatar
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    Another thread I will be subscribing too for updates!
    The Super Derecho

  6. #6
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by nitro on fire View Post
    it deffinately can be done.. my nitro rustler can hit 88 with a 3.3 and a spur/cb change
    Good to know, I think a N Rustler is around 4 Ĺ lbsÖ

    I mocked it up a little to get an idea of the weight.

    With a 4Tec front end minus the diff, a heavy BB engine and mount, heavy rear tires small fuel tank and a couple servos it is 5lbs 4 oz.
    The 4 Tec front arms are aluminum so I can shave a little weight there with the stock stuff and once I get some light weight rear wheels/tires that can handle that kind of speed that should shave off some more weight. I bolted two chassis together for mock up so a custom chassis should weigh a little less also.
    Iím not even sure if I need rear shocks yet.
    With a BB and my 3 speed I think I can at least get close if I can keep it on the ground and pointed in the right direction
    No slipper/tall gearing/power = broken parts.

  7. #7
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    is that the rear end from the T-Muggy??
    Hows that nitro taste on your electric?

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    That wing may need some mods, but good luck, we know you can do it.
    erbe emaxx 26maxx s27revo 18tmrevo XXL platinum

  9. #9
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by ToXiC MeRv View Post
    is that the rear end from the T-Muggy??
    Its the old rear I used to mock up the TMuggy

    I'm sure the rear and front wing both will need a bunch of work. I can see the front wing coming loose at 80 and having a blowover all ready
    No slipper/tall gearing/power = broken parts.

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    What engine do u plan on using?

  11. #11
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by Jersey Jato View Post
    What engine do u plan on using?
    Undecided as of now... A Big one most likely...
    No slipper/tall gearing/power = broken parts.

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    Bigger is better...

    Last edited by ToXiC MeRv; 10-29-2011 at 05:41 PM.
    Hows that nitro taste on your electric?

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    [QUOTE=Snook Man;4953261]Good to know, I think a N Rustler is around 4 Ĺ lbs…

    its 73 ounces but yea i believe thats 4.5 pds
    Last edited by nitro on fire; 10-29-2011 at 06:31 PM.
    road rage its not just drivin its a blood sport

  14. #14
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    count me in. snook wish you luck and go kick some electric's @$$.
    Quote Originally Posted by Double G View Post
    Another thread I will be subscribing too for updates!

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    if a tether car can get real close to that 200mph mark, i am sure that with snooks hamster running in that wheel day n nite, he will come up with a good way to get half that speed, with out the tether
    a youtube video of a tether car
    http://www.youtube.com/watch?v=555aeQlPprY
    often mimiced,and copied but never duplicated.

  16. #16
    Marshal Double G's Avatar
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    Come to think of it, didn't Over_revO get someplace close with his nitro Revo a while ago? Too bad he is no longer on the forum; I believe he left around the time of the big upgrade about a year ago.
    The Super Derecho

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    Those tether cars are crazy, I would hate to be the guy in the middle. If you fell you would be in huge pain.

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    Quote Originally Posted by rcdriver5 View Post
    Those tether cars are crazy, I would hate to be the guy in the middle. If you fell you would be in huge pain.
    you would probably get your legs cut off
    Hows that nitro taste on your electric?

  19. #19
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by Double G View Post
    Come to think of it, didn't Over_revO get someplace close with his nitro Revo a while ago? Too bad he is no longer on the forum; I believe he left around the time of the big upgrade about a year ago.
    Haven’t seen Over_Revo on the forums in quite a while. I will be looking at his threads for some pointers for sure though.

    Theoretically if I can get an engine to turn close to 30K rpms under the load and against the resistance, 100mph would be possible.



    I chose a 1:1 transmission ratio because 3rd gear in my 3 speed is 1:1
    Battery voltage and motor were chose just to get an rpm of around 30K.
    Rear tires may even be a little larger diameter than 6 inches.

    The 3.59:1 Rollout is very tall; a stock Tmaxx is less than Ĺ of that the engine would need some massive grunt… I knew it wouldn’t be easy.
    No slipper/tall gearing/power = broken parts.

  20. #20
    RC Turnbuckle Jr. 08kgraves's Avatar
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    I may be able to somewhat help u out Snook. I'm about to graduate from one of the best high performance schools in the country!
    there's no life like a LOW LIFE!
    Drag It!

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    Looks like a fun project! And I wouldn't worry too much about cutting out every ounce of weight. Mass has very little correlation with maximum speed obtainable, other than perhaps the additional tire deflection and bearing friction seen with increased weight, both typically being non-issues in speed trials.

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    Unless you're racing uphill, that is...

  23. #23
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    Gearing and rpm is easy.....wind resistance is what's hard to calculate.
    erbe emaxx 26maxx s27revo 18tmrevo XXL platinum

  24. #24
    RC Turnbuckle Jr. Snook Man's Avatar
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    Did a little more mockup today.

    After a little research I extended the chassis even longer (22 inch WB). The balance between the width of the rear and the length of the wheel base should make a fairly stable platform.
    I added the steering linkages and associated fuel tank setup out of a 4 Tec, cut a set of old chassis braces for a temporary transmission mount and determined how high the engine will need to be raised to mesh with the spur (3/4 inches). I didnít really want to raise the engine but it is the simplest solution for the gear mesh and it will allow me access for a roto starter. The top of the engine head is 5&7/8th inches off the ground with ĺ inch chassis/ground clearance. I will just have to play with the throttle brake linkages a little to get that setup right.

    With most everything except a battery, receiver, servos and a few braces to stiffen the chassis it weighs in at just less than 6lbs. With everything installed I should be able to keep it under 7lbs RTR depending on the lid I choose. Surprisingly it has a better turning radius than I thought it would. Iím sure I will need proportional steering to keep it in a straight line at high speeds.

    If I can find a lid to fit the layout nice and snug it should be pretty aerodynamic.





    No slipper/tall gearing/power = broken parts.

  25. #25
    RC Turnbuckle Jr. fantomaxx's Avatar
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    Make sure you use some good lag screws,to secure that engine to your 2x4!!!..looking good are you going to go ahead and use that chassis or cut your own?
    454 bb maxx

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    gonna need prob a 1/5 scale body, and those are EXPENSIVE!
    Hows that nitro taste on your electric?

  27. #27
    RC Turnbuckle Jr. Snook Man's Avatar
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    I will be making a 1 piece chassis to custom fit everything, just a simple design like an elongated triangle or diamond. That way I can use a wedge shape body which I will probably end up making somehow.
    No slipper/tall gearing/power = broken parts.

  28. #28
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    Are you gonna take it over any sweet jumps?
    erbe emaxx 26maxx s27revo 18tmrevo XXL platinum

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    how did you get a tmaxx tranny 3 speed? that boggles my mind more then the rest lol

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    Quote Originally Posted by Tev364 View Post
    how did you get a tmaxx tranny 3 speed? that boggles my mind more then the rest lol
    Snook Man made a 3 speed tranny awhile back, heres his thread, check it out, http://traxxas.com/forums/showthread...eed-conversion

  31. #31
    RC Turnbuckle Jr. 08kgraves's Avatar
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    looking good so far snook
    there's no life like a LOW LIFE!
    Drag It!

  32. #32
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    Man every time I get on here Snook has another sweet project. I would like to have just half of his mechanical genius and fabrication skills. Good luck with the project and I'll be sure to subscribe lol.
    Joshua 24:15 Choose this day who ye will serve

  33. #33
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    I was doing a little research, and if you have ever heard of powermaster fuels(made by VP race fuel) they have a drag specific 40% nitro. Just a little more help in hitting that 100mph mark
    Joshua 24:15 Choose this day who ye will serve

  34. #34
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    Looks great!
    But please tell me your going to get new tires and rims haha.




    God answers prayer,pray,believe,NEVER GIVE UP!!!

  35. #35
    RC Turnbuckle Jr. morganko's Avatar
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    I have got mine to do over a 100mph a couple times, on the freeway. But that was while it was in the back of the pickup =)
    "fat drunk and stupid is no way to go thru life"

  36. #36
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by 1979chevy. View Post
    please tell me your going to get new tires and rims haha.
    Yea, I'm sure those tires/wheels would not stand a chance. Everything is just in the mockup stage. I have all winter to get it ready.
    I think 1 of the more difficult tasks will be finding a place to test it out.

    Who is good with wind drag coefficient???

    This is about as aerodynamic as I can make unless I point the nose a little more.
    Being it is a simple wedge design I donít think I will need a rear wing which will help reduce weight and dragÖ The chassis will be cut to follow the lower body line and I will use velcro to secure the body to the chassis to keep as much air out as possible.





    I needs me a wind tunnel
    No slipper/tall gearing/power = broken parts.

  37. #37
    Marshal Double G's Avatar
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    Quote Originally Posted by Snook Man View Post
    I needs me a wind tunnel
    I see another build thread coming...
    The Super Derecho

  38. #38
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    I have a 19 tooth clutchbell if that will help with the gearing any at all. may not work though it is a not for 1/8 scale it's for the maxx or revo. just a thought

  39. #39
    RC Turnbuckle Jr. 08kgraves's Avatar
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    your going to want to round the top corners more if you can snook, and yes round front and point more to. and remember this.....

    a teer drop shape is the most arrowdynamic desighn possible. so make it slowly taper to a fine point in the back and it will reduce the drag.
    there's no life like a LOW LIFE!
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  40. #40
    RC Turnbuckle Jr. Snook Man's Avatar
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    Quote Originally Posted by revomatic27 View Post
    I have a 19 tooth clutchbell if that will help with the gearing any at all. may not work though it is a not for 1/8 scale it's for the maxx or revo. just a thought
    I have an 18T 1/8th scale Mod 1 bell. If I need a 19T and yours is the revo bell I may borrow it to test with.
    No slipper/tall gearing/power = broken parts.

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