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Discussion Starter #1
here she is, cwe just finished the cahssis....


 

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good luck :) just wondering do ya bring a welder with you ?
 

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when i go where???
is that a trick question? LOL ..where you plan to ride it
 

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Discussion Starter #5
i guess, it may be a trick question at this point?? are you assuming my chassis is gonna break???? it is built for 300' flat sand drags only!
 

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are you assuming my chassis is gonna break????
it would be a stretch to think I am assuming it will ;) ,.. but I know sand doesnt always stay flat while being raced on etc..hope it dont break for your sake ..but sort of seems possible ...even the quality materials only flex so much
 

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Discussion Starter #7
the sand that we will be racing on is a groomed track. its all santioned stuff...
 

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Looks like pretty nice work. Is this a somewhat production frame, or is a custom one off?

Here's what Ive always wondered about rigid frames. It seems like having a rear suspension would help you hook up/launch better. Does the weight savings make up for this, or is it the extreme wheelbase and monster tires? Or is suspension really not important on smooth sand?
 

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Discussion Starter #9
suspension is not needed at all on a track....there is a huge weigh savings...with the wheelbase and use of a bar, which is not pictured gives you ultimate traction

it is a totally one off frame that we built. we will be building more in the near future..
 

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I gota ask :p whats up with the little dip in the subframe, ol gut mussels getting a lil weak I guess & hard to hang on :D .
Looks good, glad it aint me riding it though, to fast looking.
Neil
 

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Discussion Starter #11
thats what needs to be done so the seat sits level on the chassis, because of the bracket and what not.... plus you want to sit as low as possible...
 

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I have one question, since it is rigid, why make the rear resemble a swingarm?

From an engineering standpoint, it would have been quite a bit stronger if the upper tubes on the rear link would have anchored to the top frame tubes at the same location as the rear sub frame.

As it stands now, looks to me like under high stress it will try to hinge at the current upper link mount which will create a stress (eventual break) point between the upper and lower frame rails.

I see you have a gusset for the sub frame but I don't see any gussets for the rear arm to the frame.

Just my opinion, allthough I must say, the frame is definately a work of art !!!

I must have taken a lot of time to fab that all up. I like the steering set up.

What material did you use, 4130 or DOM, also what wall size ?
 

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Discussion Starter #13
thanks for the input...this is how most rigid chassis are set. we are going to put one more tube in the middle of the 2 rear bars to help from "twisting". it is 100% 4130 chromoly... main frame is 1" 058 and sub is 3/4 049......
 

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I am assuming, seeing how well everything is laid out that the welds are all tig. On all of the 4130 off road cars I have helped build we had them baked in a furnace at 500 to 800 deg for about 4 hours and then allowed to cool inside the furnace until back to ambient. This helps to releive any stress due to welding that was put into the metal. Ask a local Powder Coating shop if they could do that, it might be cheap insurance....... Again Awsome bike. I'd love to throw a leg over a full drag bike like that..... MJ
 

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wow i have never seen something get criticized so much in 1 thread.

all i can say is thats pretty badass that you built your own frame...good job man! looks sick.
 

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Looks awesome to me. Good job on the fabrication.
 
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