TTC pulling sled

[War Pig]

So, I've had this idea in my head for awhile. Since we're doing the TTC here in Oregon next month, I decided to take a few hours and build it. Mostly built from parts and materials I had lying around.

The frame is made of 1/2" square tubing, rear axle is 1/4" cold rolled steel. Weight box is 16 ga. steel with screen door rollers for wheels, and they roll on 1/4" round rod. A cable goes through a small hole in the rear axle, and when the truck pulls the sled, the cable rolls up on the rear axle, goes through a piece of bent tubing at the front of the sled, and pulls the weight box up to the front.

Pics.

A couple of short videos. These test pulls were made at the site of the TTC truck pull. The ground will be raked and cleared of all sticks and rocks. These pulls were made with a 5-6 lb. block of steel in the weight box. The actual pulls will be made with a little more weight, no full pulls on my watch .

 

[EeePee]

Straight up awesome.

 

[4u2nv]

Looks good but the wheels lock up when the weight box reaches the top of the sled...

 

[2500hdon37s]

awsome sled and rig! thats a tight rig and looks good pulling

 

[War Pig]

Looks good but the wheels lock up when the weight box reaches the top of the sled...

Right.........it's set up for the weight box to travel from the back to the front of the sled in a 20 ft pull. If the box gets to the top before the pulling rig stops, then the locked up rear wheels cause that much more drag.

 

[CrawlerGraphics]

That's awesome Tim...

 

[trailduster79]

sweet!

 

[buzz1436]

I'm gonna build one and let you know how it works out!!!!!!!!!!"thumbsup"

 

[Big Mike]

I'm thinking it "resets" itself just by picking it up? Then the weight box will just pull the cable back and unwind it off the axle again as the wheels spin? Or are you guys actually going to pull it back to the start line, which would essentially accomplish the same thing and add to the realism. I guess it depends on how much time you have.

Very nice looking fabrication..."thumbsup"

 

[SlickRockSpider]

Right.........it's set up for the weight box to travel from the back to the front of the sled in a 20 ft pull. If the box gets to the top before the pulling rig stops, then the locked up rear wheels cause that much more drag.

I wanted to thank you Tim for building a pulling sled for ORCRC TTC. Not to be an ahole but ..............

When the sled gets hooked up to the rig the big plate should be off the ground. This is way Ryans 1.9 Toy did not pull the sled at all. so .................... no big deal thought you would like to know.


Evan

 

[farmerstoy]

I wanted to thank you Tim for building a pulling sled for ORCRC TTC. Not to be an ahole but ..............

When the sled gets hooked up to the rig the big plate should be off the ground. This is way Ryans 1.9 Toy did not pull the sled at all. so .................... no big deal thought you would like to know.


Evan

Isn't that the point of a sled pull? Otherwise it's just riding on the tires, which wouldn't be much of a pull....

 

[SlickRockSpider]

Isn't that the point of a sled pull? Otherwise it's just riding on the tires, which wouldn't be much of a pull....

farmerstoy point well taken. The problem here is that you don't understand how a pulling sled works.

A pulling sled is a weight transfer machine that works similar to the original design. It still uses a skid plate (which I will now refer to as a pan) and the machine has been built over the top the pan. A large ramp is placed over the top of the pan with most of it's length existing behind the pan. The sled has regular semi truck wheels in the back that turn as the sled is drug down the track. As the wheels turn a series of transmissions, gears and large chain pull a box full of weight up the ramp as the sled progresses down the track, thus transferring more weight off of the wheels and onto the pan, thus making the entire sled much more difficult to pull as it progresses down the track.

I hope this clears up the confusion. If not get on you tube


Evan

 

[JesterSpec]

no sled I've ever seen has had the pan at rest off the deck before a pull, its just very light.

 

[farmerstoy]

farmerstoy point well taken. The problem here is that you don't understand how a pulling sled works.

A pulling sled is a weight transfer machine that works similar to the original design. It still uses a skid plate (which I will now refer to as a pan) and the machine has been built over the top the pan. A large ramp is placed over the top of the pan with most of it's length existing behind the pan. The sled has regular semi truck wheels in the back that turn as the sled is drug down the track. As the wheels turn a series of transmissions, gears and large chain pull a box full of weight up the ramp as the sled progresses down the track, thus transferring more weight off of the wheels and onto the pan, thus making the entire sled much more difficult to pull as it progresses down the track.

I hope this clears up the confusion. If not get on you tube


Evan

Maybe I misunderstood what you said earlier. I thought you were saying that the pan should not touch the ground, which would obviously defeat the purpose. My bad.
I completely understand how a weight-transfer sled works, one of my fathers friends built one for the local tractor pulls, and I've seen it work many times."thumbsup"

 

[War Pig]

I wanted to thank you Tim for building a pulling sled for ORCRC TTC. Not to be an ahole but ..............

When the sled gets hooked up to the rig the big plate should be off the ground. This is way Ryans 1.9 Toy did not pull the sled at all. so .................... no big deal thought you would like to know.


Evan

Not too sure what you're talking about here Evan. I understand how it works, but not sure what you mean by the plate being off the ground. After every run I would pick the sled up, slide the box to the back, set it down at the start line, and hook up the rope to the truck.

 

[SlickRockSpider]

Not too sure what you're talking about here Evan. I understand how it works, but not sure what you mean by the plate being off the ground. After every run I would pick the sled up, slide the box to the back, set it down at the start line, and hook up the rope to the truck.

Damn Tim I can't find the words to explain it. I will gather some info and we can talk about it some other time. No big deal.

Evan

 

[Big Mike]

I've never seen a pulling sled that didn't have it's pan resting on the ground at all times, no matter what scale it was. Y'all took geometry in high school, right?

Watching the video, it's bloody obvious that it works properly.

When the sled is at it's start position, the weigh box is behind the axle, so there's essentially no weight on the pan. That's why the box moves, so it transfers weight to the opposite side of the axle and onto the pan. Once the box passes the axle, the weight is on the pan. The farther over the pan the box travels = more pressure on the pan.

It's just simple physics. Very simple...

 

[Robbob]

maybe he means that a truck with 1.9's on it causes the pan to 'dig' into the ground rather then slide on top of it when the tray locks the tires up. 2.2 rigs could actually be holding the pan up off the ground some and gives them an advantage at full lock.


looking at a lot of the TTC rigs they run 2.2 wheels and if hitch points and sleds are built for that then it could be a problem for 1.9s.


in real world pulling yes the pan rides level on the ground but hitch heights are also regulated to prevent guys from lifting the pan up off the deck.

 

[bob1961]

that is slick tim....what are the measurement spec's for it so i can build one....is there a set of measurements that are used like comp crawler and scale rules.......bob

....

 

[War Pig]

that is slick tim....what are the measurement spec's for it so i can build one....is there a set of measurements that are used like comp crawler and scale rules.......bob

....

I just built mine to my specs, but I'm sure there are some rules somewhere online.

Looking at this picture it is about 6" wide at the outside of the rails, about 22" long, and just under 6" tall from the bottom of the plate in front to the top of the rails. The weight box is around 5"W by 6"L.