Author Topic: Need some info! Bike aero...  (Read 9071 times)

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Offline joe-r1

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Need some info! Bike aero...
« on: February 03, 2013, 02:21:54 PM »
Hi! First i would like to excuse me for my bad english!
I'm new to LSR and i would like to have some info on what to do and not to do...

To begin with, my bike is a 08 yamaha r1 stock motor that i use on the street and on the strip for fun. I know its not the best bike in the world for dragracing or LSR but that my bike for now...

I'm tinking about aero and i would like to have advice...i put a link a the end so you can see my bike and what i'm talking about...
I would like to start with the front...it is better to get the bike lower as possible so it can reduce the frontal surface (big hole behind nose and fender)? i put some picture of my bike stock, then lowered 3/4 in and then 3/4 in lower and strapped...i would like to know in which configuration it will be best to put my bike for top speed.

For back of the bike, it is better to get the bike also low as possible or like stock form? I don't know if it will affect the front, front lower and back up so the nose of the bike will point down...Maybe bike geometry (steering)...

Also i know its the aero section but do extended swingarm as benefit for a strock motor bike? i already have extension...
 
If you have other suggestion to get my bike better for LSR without a full bodywork feel free to share!!

http://s1302.beta.photobucket.com/user/Joe-r11/library/
Thanks
Joe

Offline JimL

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Re: Need some info! Bike aero...
« Reply #1 on: February 03, 2013, 04:24:02 PM »
Three places to start.

Rulebook:  http://www.scta-bni.org/


Fiberglass options:  http://www.airtech-streamlining.com/landspeed/landspeed.htm


Go thru old Build Diaries on this forum, anything bike, especially starting with APS or MPS.  Do NOT miss this one:  http://www.landracing.com/forum/index.php/topic,9341.0.html

Have fun!

Offline saltwheels262

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Re: Need some info! Bike aero...
« Reply #2 on: February 03, 2013, 06:38:22 PM »
your English is a lot better than some people that live here.

getting the front and rear of the motorcycle lowered is probably the best bet.

most of the rulemakers have a percent limit on total bike length from stock, depending on class and organization.

strapping the front end might not be a good idea . can the fork tubes be extended through the top triple tree ? can you get shorter fork tubes?

bf
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 ol38y

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Re: Need some info! Bike aero...
« Reply #3 on: February 03, 2013, 07:03:51 PM »
You're on the right track. There's nothing wrong with strapping the front. Many have done it. I would just lower the rear as much as the front to keep your front geometry the same. Then, get rulebooks for where ever you want to run.  :cheers:
Larry Cason
Bakersfield,CA    It's a dry heat!

2010 BUB 1350 M-PG record
2012 Speedweek  1350 A-PG record 169.975
2014 El Mirage Dry Lake  1350 A-PG  172.651

Offline saltwheels262

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Re: Need some info! Bike aero...
« Reply #4 on: February 03, 2013, 07:06:23 PM »
if you strap that front end enough , you're going to have little or No suspension.
then what?

or is it just me?
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 wobblywalrus

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Re: Need some info! Bike aero...
« Reply #5 on: February 03, 2013, 11:06:23 PM »
The main thing is to work with the bars, pegs, and seat to get yourself down low on the bike with all of you gear on.  Then, have someone take pictures of you on the bike from the front, back, and side.  Next, make a copy of the pictures, cut out you and the bike's silouettes, and enlarge or reduce them enough so you can transpose them onto graph paper.  Then you can start to design stuff.

Offline joe-r1

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Re: Need some info! Bike aero...
« Reply #6 on: February 04, 2013, 12:22:45 AM »
Thanks saltwheels262!

i don't strap the front too tight...even on the drag strip i get speed wobble if i tight it too much! And yes i can slide the fork tube more than 3/4in.

Thanks wobblywalrus!! That a really got idea that i never think of!

An other think also is i will need some info on suspension tuning... right now it set like a drag racing...(an other tread in suspension section?
Thanks!
Joe
« Last Edit: February 04, 2013, 12:26:55 AM by joe-r1 »

Offline wobblywalrus

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Re: Need some info! Bike aero...
« Reply #7 on: February 04, 2013, 02:57:34 AM »
On the subject of a lengthened swing arm, many of the fastest, and sometimes the fastest, sit-on bikes at the BUB meet have production frames with standard length swing arms.  A lot of these folks say more length is not needed and they have the records to back them up.  A lot of other fast people lengthen them.  There are some advantages.  It is easier to get a good streamlined shape on a longer bike.  An experienced racer told me a 6-inch extension would be right for my 1000cc bike.  Geez.  Its hard to figure out the hot set up when two groups of people get good results doing things completely different ways and they have totally logical reasons why they do it.  It is like that with suspension, too.

It is nice to see a big Yamaha four on the salt.  Those R-1s are great bikes. 

Offline panic

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Re: Need some info! Bike aero...
« Reply #8 on: February 04, 2013, 10:22:10 AM »
Reducing the height by the same amount front and rear retains the original rake (caster) angle, but reduces trail.

Offline saltwheels262

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Re: Need some info! Bike aero...
« Reply #9 on: February 04, 2013, 12:50:59 PM »
I've always preferred long motorcycles. with a good 1 inch rake.
street, strip or land speed.
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 Dead Roman

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Re: Need some info! Bike aero...
« Reply #10 on: February 04, 2013, 03:19:28 PM »
Reducing the height by the same amount front and rear retains the original rake (caster) angle, but reduces trail.

Reduces wheelbase

Offline Frank06

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Re: Need some info! Bike aero...
« Reply #11 on: February 14, 2013, 10:11:57 PM »
Salut Joe:

Loring posts the rules on the web: http://www.lta-lsr.com/Pages/default.aspx.  I assume you're planning to be there in July?  Let me know if you have any questions and we can get them answered.  It's a lot of fun!

Frank
E-Racer

Offline ol38y

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Re: Need some info! Bike aero...
« Reply #12 on: February 14, 2013, 10:50:10 PM »
if you strap that front end enough , you're going to have little or No suspension.
then what?

or is it just me?

IMO it's just you... :evil:
Larry Cason
Bakersfield,CA    It's a dry heat!

2010 BUB 1350 M-PG record
2012 Speedweek  1350 A-PG record 169.975
2014 El Mirage Dry Lake  1350 A-PG  172.651

Offline joe-r1

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Re: Need some info! Bike aero...
« Reply #13 on: February 17, 2013, 06:33:30 PM »
Thanks guys!

Offline Stainless1

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Re: Need some info! Bike aero...
« Reply #14 on: February 17, 2013, 09:40:29 PM »
Whatever you do, make it and you the smallest hole that can be put in the air, then carefully close the hole.
Stainless
Red Hat 228.039, 2001, 65ci, Bockscar Lakester #1000 with a little N2O