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Author Topic: tire approvals  (Read 8943 times)

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Offline Superfast Matt McCoy

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tire approvals
« on: January 06, 2009, 01:10:11 PM »
From the rules:

"The use of any non-rated tire ... shall be submitted for approval to the contest board..."

Can anyone tell me the name/address for the contest board for El Mirage this year?

Thanks!
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Offline Glen

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Re: tire approvals
« Reply #1 on: January 06, 2009, 01:28:38 PM »
www.scta-bni.org  , on home page lower left under rules and regulations.
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Glen
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South West, Utah

Offline John Noonan

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Re: tire approvals
« Reply #2 on: January 06, 2009, 02:53:54 PM »
Matt,

Any new pics of your bike? ?

J
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Offline Superfast Matt McCoy

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Re: tire approvals
« Reply #3 on: January 07, 2009, 12:54:37 PM »
I was hoping to do a big update on the build diary once I had the rolling chassis, but i keep finding these little things to fix/add.  So it seems like I've been stuck at 90% rolling chassis for two months.

This is what it looks like now:



That's just a temporary tire on the rear, and the front is being propped up by wooden blocks.  Stay tuned.
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Offline Glen

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Re: tire approvals
« Reply #4 on: January 07, 2009, 12:58:13 PM »
Matt
Looking good, keep it up. :-)
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Glen
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Offline saltwheels262

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Re: tire approvals
« Reply #5 on: January 07, 2009, 01:02:11 PM »
  that frame is beautiful.

  with all the power going through the rear
swingarm ; will it need to be beefed up ?
who built the frame?

franey
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bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007

Offline Superfast Matt McCoy

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Re: tire approvals
« Reply #6 on: January 07, 2009, 06:23:17 PM »
I built the frame, in that cave to the left of the bike.  One of my neighbors calls me the Mad Scientist, because there's always noises and sparks coming from the dark corner of the garage. 

MWuaAhahAha.  Excellent...

The swingarm should be sufficient, I have some ribs added to the chain side that bring the buckling strength waaay up.  We'll see when it hits the Dyno.  I'm more worried about the bearings.
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dwarner

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Re: tire approvals
« Reply #7 on: January 08, 2009, 12:40:03 PM »
What tire do you plan to use that is not LSR speed rated? There are tires good to 300+ that do not require prior approval.

DW
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Offline Superfast Matt McCoy

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Re: tire approvals
« Reply #8 on: January 08, 2009, 02:46:06 PM »
http://www.airmichelin.com/pdfs/MIL_F16X.pdf

The nose landing tire.  It actually is rated, to 250 MPH.  But since it is an aircraft tire i thought i'd be safe and get an approval.
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McRat

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Re: tire approvals
« Reply #9 on: January 08, 2009, 03:27:59 PM »
Aircraft tires are very interesting.  None of the existing LSR tires seem to be a good match for our truck, due to weight loading and diameter requirements. 
Yes, they need a two piece rim and insane inflation pressures, but they have much better size selections and are tested over 200mph in many cases.
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Offline 1212FBGS

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Re: tire approvals
« Reply #10 on: January 13, 2009, 06:35:15 PM »
i have a bunch of those tires.... i think stainless has some he doesnt use either...... yep you can use em up to 250 and thats it.....251 and she's on the trailer..... oh yeah their heavier than shit and will fly apart even shaved...... not a good choice......
kent
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Offline Glen

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Re: tire approvals
« Reply #11 on: January 13, 2009, 07:47:58 PM »
I agree with Kent, I did spin tests loaded and unloaded at Douglas Air craft on the DC-9 nose gear tire. As he stated they are very heavy, need special wheels and yes they do chunk on long runs. They are designed to take off and land in a couple thousand feet.
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Glen
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Offline Stainless1

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Re: tire approvals
« Reply #12 on: January 13, 2009, 08:07:48 PM »
Quote from: 1212FBGS on January 13, 2009, 06:35:15 PM
i have a bunch of those tires.... i think stainless has some he doesnt use either...... yep you can use em up to 250 and thats it.....251 and she's on the trailer..... oh yeah their heavier than Subaru and will fly apart even shaved...... not a good choice......
kent

I would love to go 250 on ours, but I'm not going to.  We have shaved the fronts, and I think shaved they will be OK to their rated speed for a couple of miles, but I'm thinking a little safety cushion is always good.  Be sure to put them at their rated air pressure.
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Stainless
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Offline Superfast Matt McCoy

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Re: tire approvals
« Reply #13 on: January 15, 2009, 01:26:38 PM »
I talked with an engineer friend of mine who works at Goodyear, and it was his feeling that with 18 plys the tire would not catastrophically fail for well beyond 300mph, and if the temperature could be controlled then there shouldn't be a problem with the tread chunking.

Michelin states that their aircraft bias tires shouldn't ever see ambient temperatures above 225 (yes, for a few thousand feet on landing).  I've got an infrared temp sensor that I'm going to point at the tire.  I'm going to do some El Mirage runs and log the temperature.  I can stuff that info into a neural net and estimate temperatures for  faster and longer runs.  if the tire isn't moving past 160 F, I think i'll feel comfortable with that.

I hate to sound like the reckless new guy, but I'm always inclined to do the testing and run the numbers.  It usually turns out to be the less reckless path.
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Offline sheribuchta

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Re: tire approvals
« Reply #14 on: January 15, 2009, 01:52:38 PM »
Matt   Talk to Nate Jones he has a machine to spin test tires .  You will have to make the axel to fit his machine .                             



                Sheri Buchta
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