I have about 5 sets of titanium skids so I am not worried about it too much. I think the skinny front skid causing lift wont be a problem because the wide front hood and windssheild should over come it with some good downforce. I am probably going to chop it and bend it down for the front bumper splitter I am thinking about making anyway . I am going to try it without a rear wing at first if that dont work I will put one on with very little or no downforce. The verticle up rights on the sides of the wing should help with high speed stability if there is an issue.
I just talked with the tire guy and hes taking too long to get those tire made. Hes had them for 2weeks allready, wtf! taking so long . He said he will have them done by and shiped by the 25th. Well see what happens. I hope this guy dont screw me.

... No comment...

:whistle:

It seems to me the biggest problem at high speeds is the body acting like a parachute and the truck lifting, jze always ran no body. You can seal the edges of the body but the wheelwells will always be taking in huge amounts of air.

My thinking is that the body needs to be as "aerodynamically transparent" as possible. Basically a swiss cheese body. So the air doesn't get "caught' under the body. Once testing begins if you could sacrifice a body to try it could make a difference.

I really think they only lift at speed because of the body, they don't seem to lift bodyless.

Just thinking out loud.......

Actually I did run a body.....That is why it would act like a kite.

http://www.youtube.com/user/RCTVLIVE.../1/E1-XCew1rCk

bad linky

.....swiss cheese body........

Link should work now....

http://www.youtube.com/watch?v=E1-XCew1rCk

Your probably correct on the body causing lift after a certain speed. The theory of using no body to aleviate lift at those speeds would be spot on, but then you are faced with overcoming the drag. A front wing might be the key for getting the majority of the air to flow over the truck - I'd even consider one that extended beyond the wheels.

A swiss cheese body is definatly a big NO! I want to reduce drag not increase it. A body is a must! aerodynamic is key and if I run without a body it will shed about 10 mph off my speed atleast. I know where you going with it though. Your thinking I am going to have the same problem as jzemaxx with the truck taking off because of the body catching air. For one thing my body is definatly more aerodynamic and it sits way lower to the ground the hood is more sloped creating necessary down force . A couple things I am thinking about doing doing to prevent blow over that I know work is: The back of the body will be probably cut out allowing any air that sucked up by the fenders to escape out the back. It also will create a low pressure and help keep the car planted. I plan to run a little rake in the suspension also to create more frontal downforce. Batts are being push as far forward as possible. Thinking about making a front splitter(kinda like a front wing) out of a foam bumper. I also plan on taping the sides of the body to the bottom of the chassis with heavy duty clear packing tape, its amazing they line up perfect.

A little update I just put all new avid bearings in the carriers and new ceramic bearing throughout the transmission. I also put graphite dry lube in the cvds with boots and pillow ball socket also. I set all the pillowballs perfect by measurement and adjusted all of my toe in perfect, check and double checked.

well, it's a rock and a hardplace. no body= no lift, so you don't need the downforce the body creates. Add the body, you have lift and need the downforce. Of course rules dictate that the body be on.

I really think it would be worth a try once you get to testing to a/b a body with/without holes and see what happens.

I also envision an indy car style front wing that is as wide as the trucks wheels. That'd be awesome.

Just figure out how to slow down the air going over the top of the body, without causing additional drag, and you will get rid of the lift effect (bernoulies principle).

Aerodynamics is a tricky thing - there's a reason automotive and racing companies spend a fortune in wind tunnels.

Here's a thought - most leaf blowers can flow about 100mph - use one to try different things. Use a stationary video camera to record the various configurations. Maybe even get a buddy to bring theirs over so you can get more volume. Got any old smoke bombs laying around - glue some of those to the ground in front of the truck to create smoke to help see the air.

I am wanting to say that when jzemaxx fliped he was possible giving more throttle so it might of wheelied causing the blow over. I could be wrong but running 12s the throttle has to be more touchy than on 6s.
I will definatly run it without a body and see how it does. You are right on with the rules you must have a body so there is really no way around it. Must have a body with frontal down force period. With the price of bodies I am not going to buy one just to cut up. I am allready pushing the expense envelope with this build buying parts and extra parts for spares. Besides think about a topfuel funny car they have no holes in the body at all but the back of the body doesnt cover the rear of the wheels.This is the same idea I am having besides if you read the 91.2 mph revo thread again he did the same thing and it worked perfect. The front wing idea is called a splitter I just have to figure it out somehow.
LOL no homemade wind tunnels if it work it works if not oh well. I put a goal of 100mph because it just a goal and somthing to strive for. If it does 80mph I will be happy remember my first goal is to break the current 72.8 mph official record held by a hpi wheely king on buggy tires.

No, a wing and a splitter are two completely different animals. A wing controls air flow, a splitter essentially stops it and holds it (which is how it makes downforce). So your downforce is completely on the nose of the vehicle, rather than spread over the hood and/or roof line. If you want to use a splitter style, be prepared to raise your wing up and/or increase its angle to catch more air. Hopefully you wont end up with too much downforce - that will kill speed also.

What I meant to say I was thinking making a front bumper kinda like a combo bumper splitter shaped like a wing to help direct airflow up and over and around the outside of the tires. Kinda like this but shaped better.
http://i153.photobucket.com/albums/s...heely-king.jpg
Hard to believe this is the record holder. but it is 72.9 mph talk about Isnt that a 10th scale esc and motor? but it is from 2007.

Funny that the record holder is ineligible under current rules, but good for the sport that the rules are now there.

I just have this nagging feeling that your setup sans splitter and wing(even less weight) with a swiss cheese body would outperform a normal body with the splitter and wing. I think a monster truck needs a wing about as much as a rice rocket with coffee can exhaust:lol:


This thread is going well, but just to clarify I'm not arguing or trying to change your mind, just brainstorming in text. I want to see you break 100 and be able to tell my friends I talk with the owner of the worlds fastest monster truck online! Simple joys for me nowadays!:intello:

Why wouldnt he be legal harold ? I dont really see anything wrong with it. Swiss cheese ain't going to cut it harold LOL. I dont mind anybodies ideas, my brain is tacked out trying to figure out what I need to get and what to do next. I have had the flue all this week so I started working on the truck again today. I am going to do some testing with out a wing but I might need the verticle uprights for high speed stability. OverrevO said the modified wing actually helps stabilize the car at speed. So I am sure it would help.

his wheels were inside the body IIRC and I thought they made some rules about tire size that would make it ineligible. You're making me question myself now, I'm going to have to re-read the rules!

edit: re read the rules and I'm confused. I thought there was a specific monster truck class with MT rules. I thought I also read about a seperate speed challenge elsewhere. I think I'm getting the two confused. My bad!

You know what the wheels do need to be outside the body but I never did see a pic of that truck with a body on so I dont know. They use to have a separate MT class now its just an open wheel class. Not really fair because I will be competing against buggies and any open wheels car.

maybe drill a lot of holes in only the rear to let air out and try mto maybe cover up some of the wheel wells up to keep as much air from getting in? :neutral:

He was discredited later for running foams and essentially a touring car body. The next guy behind him was a 3906 emaxx that went 70.1mph. He was on this board for a while. Twin 6XL's I believe on 5S. His name is JohnnyMax

Video of one of his passes

http://www.youtube.com/watch?v=cK7J1w4TYfA

Also the rules I went by are from the WFRCCC

Rules from the last time they held the event.....

Whats funny is that emaxx had buggy tires on the front, 2 wheel drive and ran a lamborghini body also. So whats really the difference. Neither one is really a monster truck anymore. As we all know foam tires are needed only way too achieve speeds in excess of 80mph. Unless you run taped and wraped phaltlines. The whole thing with the body is there is no real back or tailgate area its wide open, so I really dont think it will be a problem with the parachute effect.covering up the wheel wheel with clear packing tape might help.

Yes but the wheels are outside the body....the wheely king was not. It was just a plain touring car.

Well the rules for this years isc event are tires have to be outside the body. No specifics on tire size or type. I believe all the open wheel classes are put toghether to compete. The way I see it there is no specific mt class or buggy class , they are all merged into one.

The wheelie king was more or less a touring car with solid axles...

I attended that event and helped pit for our RCM representative (JohnnyMaxima) whom I still consider to be the true winner that day.

Johnny's truck was still EASILY identifiable as an E-Maxx (G-Maxx) when it went down the straight... The wheelie king looked no different than a TC4.

As for your body, you should look at the Pro-Line Hard Drive. It has pre-made depression which can be cut out in a way where you will have a ton of area for exhaust to escape from the inside of the body (reducing lift) but it does it in such a way where it doesn't destroy your aerodynamics.

Another way would be to just cut away the rear windshield of the body to help purge all the air.

It look like a G-maxx with a lambo body and small tires up front? IMHO neither one was still a MT anymore.At least the wheely king still had 4wd. I have my bodies now so I really dont need to buy anymore. It should also have that MT look except for the ride height.

Love the commentator in that video of John Crook's Emaxx!! I'm crying laughing....

Link?

Looking to get bullets connectors . Should I get 5.5mm or 6.5 seems like to me the 5.5 should handle way more amps than the trx conectors. I am looking at the hobbycity 5.5mm conectors 10 sets for ~$10 seem pretty good. Can anyone comment on the quality.

5.5 would be fine but 6.5 for a little more $$ wouldn't hurt.

Personal Opinon;
TRX plugs suck, I did some soldering for a friend the other day and he has the TRX plugs and they are garbage. Yes they have a nice sized plug thats easy to grip but thats it.

Rivermaxx, check those prices because last time I looked the 6.5mm connectors Hobbycity has were cheaper than the 5.5mm's....

The 6.5 are out of stock but I will check again. I am going to place a big order . Can you guys recomend anything? I am getting 2 6s 3300mah 30c batts. Some 10 guage black and red wire. Some 6mm and 10mm black wire shield. A Icharger 106b but I need to pick a good power supply for it. I need bullets also just need to figure which ones. OH yea shrink tubing also. Any recomendations? btw the 5.5 polymaxx bullets are $4.99 for 10 sets or pairs thats pretty cheap.

Supposedly the Zippy "H" packs are the best, They had 3300mah 6s in stock a few weeks ago.
Make sure the cheaper bullets that the female end doesn't spin inside it's self, a little solder will cure it.
HC has great prices on heatshrink, Not the best of qaulity but plenty good enough.
The 6mm might still be out of stock in black ?

The only issue is the zippy h's dont have enough c rating. the turnigys have 30c with 40 c @ 10 second burst, The zippys are 20-30 c . I might need that 198amp cotinues rating for the high speed setup. Heat shrink is out of stock and they dont sell 6.5 mm bullets just 6mm and 8mm. Will 5.5 work or are they too small? If I have too I will just buy castle 6.5 bullets.

Try cheapbatterypacks.com (out of Oregon) if Castle doesnt have what you are looking for. I've used thier connectors, and they are high quality.

Ok guys, my truck is pretty much finished and I am still waiting on the custom made tires. The guy making them is taking way too long and keeps giving me excuses. Anyway I decided to go do some testing with some of those low profile panther tires that there was a lot of dispute about back in the day. I figured the low profile and the fact they are belted would help with high speed separation. BOY WAS I WRONG!. I made a couple of <1/2 throttle 50mph+ passes on my short street with no problems except the street definatly wasnt long enough. So Me and my buddy went out with the radar gun to a long street with little traffic and tried to better the passes a little more. Well it started out good and straight and about 1/2 way in the pass I rolled past the 1/2 throttle mark a little and all of sudden car jumped a little and came to a side ways stop after 15 feet. When I finally get down there 2 of the tires came uglued from the wheels from the centrifical force. The radar gun said 59 mph before epic failure of the tires. The nice thing about it is it stayed rubber side down and if it would of rolled without a body I would of been pissed. I really need those custom tires now so I can test properly.He said they are done and have been shiped but still havent seen a delivery confirmation #.

We are all anxiously awaiting the arrival of those tires... Remember the video camera next time... Please...

Got my tires and wheels today they look really good and are really light. Time for some real testing hopfully I can get past 1/2 throttle now. I also noticed on my previouse 59 mph run the pinion gear was loose and spinning on the shaft. I am running 2 6s(22Volts) 3300 mah 30c batterys in parallel for a total of 6600mah and 198 amps continues and 264 amps peak. I am running all 6.5mm bullets capable of handling 200amps. Heres pics of the tires:
http://i153.photobucket.com/albums/s...s/CIMG2624.jpg
http://i153.photobucket.com/albums/s...s/CIMG2626.jpg
http://i153.photobucket.com/albums/s...s/CIMG2627.jpg
http://i153.photobucket.com/albums/s...s/CIMG2629.jpg
Thinking about lengthening the chassis a little more and use a UE mono thunder long steel shaft. But Its alot of work for only ~30 mm more. I wil see how this setup does.

Sick!
Very nice job

we need pics!