Landracing Forum
Bonneville Motorcycle Speed Trials => Bville Motorcycle Speed Trials General Chat => Topic started by: nrhs sales on August 02, 2010, 03:34:41 PM
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If you are planning on attending Bubs and running in open class (not partial streamlined) make sure you read the addendum to the seat rule:
Any aerodynamic aid at the rear of the motorcycle (including the riders seat section), shall not extend past the most rearward edge of the rear tire, shall not be higher than 4 inches above the lowest section of the seat base, nor extend below the seat base by more than 1 inch.
It is going to make about 75% of all bikes illegal by the way they are interpreting this rule. basically almost all bikes with a stock seat will be considered illegal under this rule as they are measuring from the bottom of the seat (not where you sit but the literal bottom of the seat at its lowest point) to the top of your tail section and almost all bikes nowadays have an angle to their seat or the passengers section sits higher. My Buell Blast with a stock seat and tail section is illegal under this rule.
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thanks for update...
Joe :)
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good old days open bike is open was that for mod. and alt? went to ElMO didn't conform . not seat worked
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Yep - that's definitely a bummer. Why 4" and not 5" or 6" or 3"- wonder who fabricated this beast? Looks like I'll be at BUB with a piece of wood and some padding not to exceed 4". My nice seat at, 5" will be in Michigan, I'm not cutting it up. I saw that rule earlier, but wasn't quite sure what they meant bu "Open Class"? Since I'll be running in M/BG I guess it does apply to me as well (No Streamlining). Thanks for making me look at this again!
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The big issue here that I can see is what is "an aerodynamic aid" I can see that meaning a big tall seat hump behind the riders butt but to say you cannot have anything that is 4" higher then the lowest part of your seat is basically saying on most bikes you will have to remove your seat and tail section and sit on top of your battery, electronics, etc,that are normally covered by your seat and bodywork.
When they have a rider severely burned by an electric short I can just imagine the uproar that is going to happen. I just hope the AMA can fix this before the event happens in less than a month.
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I am glad I don't have to worry about that problem any longer...the fine folks at Bub are doing the best job they can however who is making up the AMA rules?
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Went from this ... which did not comply to the letter of the law although I dont see much aero advantage but the rules are the rules
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To this ..... This should be in full compliance ...
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Good question John. The answer I keep getting to that question is they are trying to be the same as the FIM :?
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F.ffing I.gnorant M.orons..
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:-D at John!!!
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better photo of seat/fender
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I have learned that the AMA is working on this issue as i think they did not realize the implications so hopefully it will not be a problem come next month.
But I do recommend folks be prepared with a different seat or tail section just in case if you think your bike might not pass tech.
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Only 25 Days till Tech at BUB. Hope they get some word out soon, will save some extra work for the racers.
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I broached this subject on July 10 in the rules section and sent a photo of my seat from airtech to Drew Gatewood AMA Tech Inspector. He responded that the seat that i had was ineligible to compete in the open class. Remember its not so much how you punch through the air, as much as it is how clean you have that air flow leaving the bike, i.e. burbling and eddy currents create drag. I think the AMA's premise is that a clean airflow over the rear is an aerodynamic aid that may be caused by the height of the seat bubble.
P.S. I was verrrrry aggravated with his response but changed out the seat, may run PS class next year
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Seat humps are NO GO at Bubs this year in open class. It better be flat at the back.
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Jim took the tail fairing off the 750 last year, just left the framework, can't remember if it was at speedweek or Bubs , don't think it made all that much difference, std type tail fairings are not realy big enough to be any real aero advantage
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Yep, kinda figured it would probably end up that way. So here is my last minute effort, just need to toss on some padding/cover (hard to make a POS look decent for the BUBet's, AMAski's and FIMflam's). I have a bunch of things that need to get done before I leave for BUB on Aug 21st (17 days for me). Can't be messing with this seat stuff. A little surprised more folks have commented, perhaps no one goes to BUB anymore (probably the last time for me as well). My fix was simple, but I feel sorry for the stock seats racers that can't be replaced so easily.
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And there are people that think my tube frame rails are uncomfortable ... I think that the flat board is going to crush your nuts ...
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Just got back from the store - No Crushing for me!
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Posted on BUB Speed Trials website 8/10/2010
http://www.speedtrialsbybub.com/2010_event/AMA-BUB-Aerodynamic-Clarification-UPDATED080910.pdf
If anyone has further inquiries regarding the above; I may be reached at the following numbers,
and if not available immediately will return your email or call as promtly as possible.
Thank You
Drew Gatewood
gears55@frontier.com (new email address)
219-926-5647 (Indiana)
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WooHoo. Glad to see the AMA reacts quickly to a potential problem!!! Thanks to all who were involved in getting this clarified quickly!!!
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Looks like I have an extra seat! What do you think the last line of the revision means?
"The primary seat area of the motorcycle must be covered at all times". Hopefully nothing surprising.
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Primary seat area must be covered at all times????
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"Looks like I have an extra seat! What do you think the last line of the revision means?
"The primary seat area of the motorcycle must be covered at all times". Hopefully nothing surprising".
Google this - Matthew 7:7
then reread post #20
9am - 6pm CST
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The AMA is beginning to write rules like the FAA. in the first amendment (June 29, 2010)it is shall not which according to their word usage in the rule book is mandatory. In the latest amendment (August 6, 2010) it is should not again according to their word usage is recommended. My thought is bring both seats and see which one passes tech insp. to set a precedent for next year. Ah humans, so analog, but that's what makes it so much fun.
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I am pretty sure they are trying to avoid the debacle that happened last year where folks were putting a rag on top of their battery and sitting on it due to them being told they had to remove their seat and tail secions. Basically they are saying you need to have some sort of cover over your electronics and what not. No open holes with stuff exposed under your butt. at least that is my interpretataion.
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As you can see from my photo the seat is designed and engineered and actually comfortable. It is not removable. It doesnt have much cover but it has nothing to cover.
Joe
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Joe,
Put a thin piece of foam rubber over it if there might be a concern.
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I need the bottom open ... I have a seat pan that I made first time around but I crushed my nuts when I sat on it ... I will make something to comply ... Joe
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I don't think you will have any issues Joes. They just do not want folks sitting on live electrical wires or on top of fuel lines.
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(http://i221.photobucket.com/albums/dd166/55chevr/IMG_0126.jpg)
I think I have met the letter of the law.
(http://i221.photobucket.com/albums/dd166/55chevr/IMG_0122.jpg)
This was the first seat pan I made and abandoned in favor of the now abandoned bread box tail piece .... Joe