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Author Topic: Hump on back neckline  (Read 5330 times)
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Chris V
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« on: January 22, 2017, 02:17:29 PM »

searched forum for this and in June 2015 this was asked and no real answer that I could get out of it.
So is anyone have the hump on there leathers behind the helmet in a class other then "Partial Streamlining"
After being at Bonneville the last 6 or 7 years and never rode the mile I'd like to try out.
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1972 Yamaha R5  350cc
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« Reply #1 on: January 22, 2017, 04:19:38 PM »

My Alpinestar suit has the hump, I rode in BMST Run What ya brung class with it, No problem ,  But if you run that class
Your stuck on the Short 3 Mile track !!
 
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Koncretekid
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« Reply #2 on: January 23, 2017, 08:21:07 AM »

At BMST, I had thought that the use of a speed hump in all but partial streamlined was not allowed, but having re-read the rules about 3 times last night, I can find no mention of it.  The only possible rule that may apply is as follows:

5. J. OPEN CLASS
Open class motorcycles do not permit streamlining. Streamlining is anything that has the perceptible purpose of directing or controlling the airflow around the motorcycle and/or rider, thus reducing drag.

So it may be a judgement call by an inspector, and a written request to the tech committee may be the only way to confirm that the speed hump may be used in other classes.  I, too would like to know the answer so I don't end up with two sets of leathers to run open and PS classes.

Tom
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Calkins
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« Reply #3 on: January 23, 2017, 09:13:10 AM »

If you 100% do not intend to set a record, you should be able to run a speed hump in any class.

My friend got teched at Speed Week (SCTA) and Van Butler allowed him to run his RR leathers with a hump, since he was just planning on getting his license.  AMA/FIM may be different, it all depends on the tech guy.  If you enter a class, and tell them you are just going out for kicks, you should be fine.
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Justin Calkins - Iowa Falls, Iowa  USA
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« Reply #4 on: January 23, 2017, 09:20:19 AM »

A couple of comments offered for whatever they're worth.

The hump in my Z Leathers is removable - sort of.  That is, the lump itself is stuffed inside a zippered pocket on the back - so the stuffing can be removed to (theoretically) make the leathers okay for classes where the hump ain't kosher.  HOWEVER - and it's a big HOWEVER - the "pocket" that remains when the stuffing is taken out ain't very supple, so either yoou'll need to give up lots 'cause it's so ugly to the wind as it flutters and flaps - or you'll have to tape it down like hell's hounds are chasing you for that loose leather.

And I've gone through tech a few times with the hump all there and standing proud - with nary a question about the suitableness for class.  That's what's to be expected.  But there hasn't been a re-inspection after I qualified/backed up a record -- to see if that hump is there and if it's legal in my class.

That that for what it's worth.  By the way, all of my runs have been SCTA/USFRA.
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Jon E. Wennerberg
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Chris V
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« Reply #5 on: January 23, 2017, 10:16:04 AM »

Thanks for the reply's I'm going to contact BMST rules committee and forward my concerns
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« Reply #6 on: January 23, 2017, 10:23:35 AM »

That's ALWAYS the best way to get the answer you need.
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Jon E. Wennerberg
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« Reply #7 on: March 25, 2017, 09:42:17 PM »

Thanks for the reply's I'm going to contact BMST rules committee and forward my concerns

Tech@bonnevillespeedtrials.com

See you on the Salt,
Linnea
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« Reply #8 on: March 25, 2017, 11:33:35 PM »

The way the SCTA stresses safety it seems

they would be hard pressed to consider the lump

as streamlining. Safer to run in one class than

another because of the way the leathers are made:

preposterous.

FREUD

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Chris V
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« Reply #9 on: March 26, 2017, 10:38:47 AM »

I've forwarded my concern to Tech BMST twice beginning 01/23/17 havn't heard anything yet 
would like to know for sure so as to enter proper class
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« Reply #10 on: March 26, 2017, 12:01:42 PM »

I've forwarded my concern to Tech BMST twice beginning 01/23/17 havn't heard anything yet 
would like to know for sure so as to enter proper class

I emailed them for you just now….
The main home office has moved and is in the process of setting up shop again.
Thank you for your patience.
have a great weekend. -Linnea
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« Reply #11 on: September 05, 2017, 10:30:10 AM »

Did anybody get an official answer on this?  I see online 2017 photos of the 3000 A-PBF record breaker in AMA and FIM with the hump?
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Ralph Pitlock
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« Reply #12 on: September 05, 2017, 11:20:05 AM »

My understanding in SCTA is that "Humps" are legal for "Partially Streamlined" classes ONLY....

Robert in California
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« Reply #13 on: September 05, 2017, 04:22:51 PM »

I am asking about BMST event rules.
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Ralph Pitlock
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« Reply #14 on: September 05, 2017, 05:12:56 PM »

Just have butt implants surgically inserted high on your back and make the leathers to fit. Anything for speed!
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