New monster truck rules for world's fastest r/c challenge
 

Here are the new rules for MT's in this year's world's fastest r/c challenge. I figure a few of you guys here would be interested in these changes. Looks like no more wheely king touring cars allowed. :lol:

http://209.196.57.91/ME2/dirmod.asp?...CFB0BAC9C6289D

Tire size: Tires must have a minimum 130mm diameter and 70mm width. Foam tires are allowed. There is no rule regarding sidewall height.

Body type: Any body type that can be identified as a truck (stadium, pickup or SUV) is permitted. The wheels must be OUTSIDE the body, not tucked into fender wells or skirted.

i'm glad they made some changes, but i'd like to see a few more like suspension travel, ground clearence, and other things that'll identify it as a monster truck.

Good news. I think there will be alot more entries this year, and no doubt half of them V-twins from the traxxas forum....

As for suspension travel & all, I think its best not to make those areas too regulated, since the best way to make an MT go fast is to slam it to the ground and tiptie the suspension, a la JonnyMaxxima style. I know what you mean though- I woud hate to see a 1/8 TC being passed off as an MT just because its got 40series roadrages mounted, lol.

It's good that they made some rules for the MT class to stop what happened last year, but I think they should have made the minimum tire width a few mm less, because LPR's might have been a good speed run tire (probably not as good as the phaltlines though), but mine are only 68mm wide, not 70mm, so they wouldn't be legal.

If they had those rules last year, Johnny wouldn't have been able to compete as a monster - he had a touring car body.

My Savage will be competing this year, and I'm planning on meeting all of those guidlines :yes:.

His front tires would have been illegal as well wouldn't they?

they should make it 4 wheel drive as well

This is good news for the guys who will bring real trucks. I will see if Mike can have my chassis done before the event and I might run with a 1/8 scale truggy and a buggy. I have a company who is waiting for the chassis to be done so they can supply me with a couple of 22.2v 5000mAh packs.

Didn't see this thread.
No Lambo body for me this year. No worries though. Still plan on breaking the 80mph mark.

Sweet ride you had last year John. Hope to make it this year. If the MMM comes out soon, I hope to run twins.:mdr: I am actually building a second MRC like the one pictured below. It will run all rpm arms, steel tranny/diff gears, 40 series road rages out back, droped/stiffend suspension. It's 1/8 scale but hope to come in at 10lbs or better.

I like the new rules...but I do agree it should be 4WD... What was the record last year?.. 5th scale size are allowed as well?...

Does there have to be any "stock" element to this... I'm thinking FLM extended stampede chassis / Extended arms - with ceramic bearings - LARGE direct drive outrunner 400-500kv on 6S lipo - with 130 foam tires.

Is there anything about acceleration or rolling starts?

Differential Ratio: 1
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 1
Pinion Tooth Count: 1
Total Voltage: 22.2
Motor KV: 400
Tire Diameter (inches): 5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 1 : 1
Total Ratio: 1 : 1
Tire Circumference (inches): 15.71 inches (398.98 mm)
Total Motor Speed: 8880 RPM
Vehicle Speed: 132.09 mph (212.18 km/h)
Effective Speed Rate: 5.95 mph/V (9.56 kmh/V)
Estimated Adjusted Speed: 106 mph (171 km/h) - 19% loss
Effective KV Value: 400
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

I like the pede idea. Maybe use a small brushed motor with a airplane gearbox to a small wheel to get it all moving. Mount it on the back like a wheelie bar, you could even spring load it so that the torque of the motor holds it to the ground under power and when you let off it clears the ground. That way you could start the outrunner when it is moving, say around 5mph. That would cure the startup issues and whining when you win.

If you were to use a wheely bar, this could be built in to the center of it. Just a thought...

The only thing that might be a little hard is keeping it from lifting off. I only took my Stampede to 45MPH and if I gave it some more throttle it would start lifting off the ground.

That aero/weight though - You can mount at least one battery under the chassis at the other well forward...

Also no gearbox just a motor so will be lighter at the rear...

I would also be dropped to 5mm off the ground...

That's the thing, I have one battery under the chassis and it still lifted at a little over 45MPH.

Got to work on the front downforce at highspeeds. Picking the right truck body is key. You could also make some louvers in the front of the body for air to escape that flows underneath the body, causing you to lift at higher speeds.

This vid shows what you guys are talking about. (Skip toward the middle to see the higher speeds with the 3s 5K pack.)

Even with weight strapped to the front end, it would still lift off the ground at high speeds. It even flipped on its back around 60 mph.

snellemin is on the right track with the downforce idea. I kinda quit on it once I hit 68.7 in my pede. I bet if I figured it out, I could finally break 70.

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Last years record was 72.something mph. 1/5 scale is allowed.

On the rustler/pede you need to mount an RPM wide bumper upside down This creates good downforce on the front eliminating front lift.

Tried it. It helps a bit but not enough.

The next thing I'm going to try is a swami wheelie bar upside down. The wheelie bar wheels are just barely above the ground, so hopefully that will do the trick.

Yes, I currently have my wheelie bar upside down and low to the ground. The wheelie bar needs to be very strong as it will bend under force.

If a rustler VSL can do 70 I would have thought this could be broken with a tuned pede... Not sure if this classes as a MT in the truest sense though...

Valid point- the Pede just looks like rusty on stilts in my eyes...

I prefer the newera skidplates and wheeliebars. They are a bit longer.

http://i189.photobucket.com/albums/z...r/DSCF2301.jpg
http://i189.photobucket.com/albums/z...r/DSCF2184.jpg

I'm going to take a picture of my skid plate tomorrow. It's not fancy.

IT's ALIVE!! I got the ESC working again. Just ran it for 5 minutes with a little hacker motor and 2s2p A123's. I'll play with it some more tomorrow and see if it burns up again.

Is it the ESC that's on the Cheap "high voltage" esc thread? If so check out the pictures I posted there. http://www.rc-monster.com/forum/show...?t=9624&page=9

shoot, I posted my response in the wrong thread ..heheheheh.

I like the new rules.... so I should be able to run my RWD 1/5th Monster Truck without a problem... Too bad mine's not 4x4..