TWT Forums  

 


Go Back   TWT Forums > General Discussion > General

Notices

Reply
Forum Jump
 
Thread Tools Display Modes
Old 11-07-2018, 05:22 PM   #1
JTS
 
Join Date: Jul 2016
Location: Wichita Falls
Posts: 84
Death wobble video

A while back there was a video of someone testing on a track. The rider would put the motorcycle in a tank slapper/death wobble and recover by lowering his center of gravity by laying on the tank.

I am trying to find the video but haven't been having any luck. Does anyone remember the thread it was posted in?

A friend of mine just crashed his loaded bike heading to the hill country 500 and he said the front end just felt light and started weaving before he went down at around 60-70 mph.
__________________
KLR 650
KTM 500 EXC 6 Days
KTM 1190 R
JTS is offline   Reply With Quote
Old 11-07-2018, 05:29 PM   #2
South Tex
Forum Supporter
 
South Tex's Avatar
 
Join Date: Nov 2017
Location: Kosciusko
Posts: 222
Re: Death wobble video

Wow! Hope he’s ok.


Sent from my iPhone using Tapatalk
South Tex is offline   Reply With Quote
Old 11-07-2018, 05:34 PM   #3
RollingJ
 
RollingJ's Avatar
 
Join Date: Jan 2011
Location: Lake Charles, La
Posts: 2,721
Re: Death wobble video

Ouch! First thing to check is tire pressure and then steering stem bearings/adjustment.
__________________

2006 KTM 450 XC-G Plated
Avatar by Rman of 237
I'm allergic to selfish
RollingJ is offline   Reply With Quote
Old 11-07-2018, 05:43 PM   #4
Jarrett
Forum Supporter
 
Jarrett's Avatar
 
Join Date: Apr 2018
Location: Waxahachie
Posts: 1,116
Re: Death wobble video

Yeah, hope he is ok. What bike was it?

Is this the video?

__________________
The DCT Trio:
2016 VFR1200X
2016 CRF1000L
2012 NC700X

Last edited by Jarrett; 11-07-2018 at 05:48 PM.
Jarrett is online now   Reply With Quote
Old 11-07-2018, 05:52 PM   #5
JTS
 
Join Date: Jul 2016
Location: Wichita Falls
Posts: 84
Re: Death wobble video

He is going to be ok, some broken fingers, wrist, ankle, some road rash. It happened on the 3rd and he is in Parkland now. He was riding a 2018 KTM 1290R. He had it loaded down pretty heavy for some camping.


I remember the video being pretty old. From like the 60's or 70's.
__________________
KLR 650
KTM 500 EXC 6 Days
KTM 1190 R

Last edited by JTS; 11-07-2018 at 05:54 PM.
JTS is offline   Reply With Quote
Old 11-07-2018, 06:05 PM   #6
gixxerjasen
 
gixxerjasen's Avatar
 
Join Date: Oct 2007
Location: Far East DFW
Posts: 11,157
Re: Death wobble video

Language warning on Jarret's video.

Even worse is what that video did to my shorts. Holy smokes that was scary. That guy didn't pull over because he rode through some mud, he needed to catch his breath and change his shorts.

I've had one tank slapper and it's no fun. Glad your friend is ok.
__________________
My Blog
Current Bikes:2007 Yamaha FJR1300AE | 2016 Suzuki GSX-S1000 | 1998 KTM 250 EXC | 2001 Suzuki DRZ-400E
Family Bikes: 2006 Honda CRF70F | 2005 Honda CRF230F
gixxerjasen is online now   Reply With Quote
Old 11-07-2018, 06:15 PM   #7
Jarrett
Forum Supporter
 
Jarrett's Avatar
 
Join Date: Apr 2018
Location: Waxahachie
Posts: 1,116
Re: Death wobble video

Quote:
Originally Posted by gixxerjasen View Post
Language warning on Jarret's video.
lol, my bad. I didn't make it to the end where the commentary starts
__________________
The DCT Trio:
2016 VFR1200X
2016 CRF1000L
2012 NC700X
Jarrett is online now   Reply With Quote
Old 11-07-2018, 06:17 PM   #8
Rudy
 
Rudy's Avatar
 
Join Date: Oct 2017
Location: Brenham
Posts: 44
Re: Death wobble video

Quote:
Originally Posted by JTS View Post
He is going to be ok, some broken fingers, wrist, ankle, some road rash. It happened on the 3rd and he is in Parkland now. He was riding a 2018 KTM 1290R. He had it loaded down pretty heavy for some camping.


I remember the video being pretty old. From like the 60's or 70's.

Wobbles and Weaves part starts at 4:00
__________________
1971 Honda Trail 90 - Sold
2006 Yamaha XT225 - Sold
1999 Honda Magna
2005 Victory Vegas 8-Ball

"Power is nothing without control" - Pirelli Tires

Last edited by Rudy; 11-07-2018 at 06:21 PM.
Rudy is offline   Reply With Quote
Old 11-07-2018, 06:18 PM   #9
Jarrett
Forum Supporter
 
Jarrett's Avatar
 
Join Date: Apr 2018
Location: Waxahachie
Posts: 1,116
Re: Death wobble video

Quote:
Originally Posted by JTS View Post
He is going to be ok, some broken fingers, wrist, ankle, some road rash. It happened on the 3rd and he is in Parkland now. He was riding a 2018 KTM 1290R. He had it loaded down pretty heavy for some camping.
****, that's scary. Didn't know loading one down could cause issues like that.
__________________
The DCT Trio:
2016 VFR1200X
2016 CRF1000L
2012 NC700X
Jarrett is online now   Reply With Quote
Old 11-07-2018, 06:55 PM   #10
South Tex
Forum Supporter
 
South Tex's Avatar
 
Join Date: Nov 2017
Location: Kosciusko
Posts: 222
Re: Death wobble video

Glad to hear he’s gonna be ok. Not to change the thread, but maybe we could get a ride/crash report? What gear was he wearing and did it work or fail. Real life experience is how we really learn.


Sent from my iPhone using Tapatalk
South Tex is offline   Reply With Quote
Old 11-07-2018, 07:25 PM   #11
one Wolf
 
one Wolf's Avatar
 
Join Date: Mar 2009
Location: Weatherford
Posts: 939
Re: Death wobble video

Murray convinced me, CFS for lunch tomorrow!
__________________
James, aka, 'one Wolf

2016 GSX-S 1000FA... purple cap

2014 BMW R 1200 GS... purple cap

'07 FJR1300, purple cap...Gone

'08 Silver DL1000, purple cap...Gone

'I don't wanna die, I just wanna ride my motorcy.....cle'
one Wolf is online now   Reply With Quote
Old 11-07-2018, 07:31 PM   #12
aspr
 
aspr's Avatar
 
Join Date: Feb 2015
Location: Fm 1681, Stockdale.
Posts: 998
Re: Death wobble video

So now that we know he's okay, how's the bike?

Sent from my SM-G965U using Tapatalk
aspr is online now   Reply With Quote
Old 11-07-2018, 10:16 PM   #13
JTS
 
Join Date: Jul 2016
Location: Wichita Falls
Posts: 84
Re: Death wobble video

I haven’t asked much of the details of the crash or the gear other than how fast he was going. I will get more details after he is released from the hospital.
__________________
KLR 650
KTM 500 EXC 6 Days
KTM 1190 R
JTS is offline   Reply With Quote
Old 11-07-2018, 10:25 PM   #14
aspr
 
aspr's Avatar
 
Join Date: Feb 2015
Location: Fm 1681, Stockdale.
Posts: 998
Re: Death wobble video


Cant be too pretty, wobbles at 60-70mph would be violent.
Glad he is relatively okay.
it's been said a bunch on the recent crash/surgery threads, make sure to stress to him about following PT.

Sent from my SM-G965U using Tapatalk
aspr is online now   Reply With Quote
Old 11-08-2018, 06:29 AM   #15
Jarrett
Forum Supporter
 
Jarrett's Avatar
 
Join Date: Apr 2018
Location: Waxahachie
Posts: 1,116
Re: Death wobble video

In general though, is this a thing?

Loaded down bike developing a wobble due to additional weight?
__________________
The DCT Trio:
2016 VFR1200X
2016 CRF1000L
2012 NC700X
Jarrett is online now   Reply With Quote
Old 11-08-2018, 06:40 AM   #16
toolfooldan
Forum Supporter
 
toolfooldan's Avatar
 
Join Date: Oct 2018
Location: Temple, TX
Posts: 6
Re: Death wobble video

Glad your friend escaped major injury. Hopefully no long term effects.

The British video was enlightening. I've not experienced wobble or weave; it looks scary.
toolfooldan is offline   Reply With Quote
Old 11-08-2018, 10:01 AM   #17
JTS
 
Join Date: Jul 2016
Location: Wichita Falls
Posts: 84
Re: Death wobble video

Quote:
Originally Posted by Jarrett View Post
In general though, is this a thing?

Loaded down bike developing a wobble due to additional weight?
Looking at the video, it doesn't appear that the additional weight would be the issue. Maybe the top rear box or the panniers may cause some issues.
__________________
KLR 650
KTM 500 EXC 6 Days
KTM 1190 R
JTS is offline   Reply With Quote
Old 11-08-2018, 10:14 AM   #18
dukey33
 
dukey33's Avatar
 
Join Date: Apr 2006
Location: Seabrook, TX
Posts: 3,994
Re: Death wobble video

Quote:
Originally Posted by Jarrett View Post
In general though, is this a thing?

Loaded down bike developing a wobble due to additional weight?
It is not the loaded down part, but more importantly the weight distribution. Typically, loading gear on a bike is done high and to the rear. This is inherently bad as demonstrated in the video where shifting weight forward and lower calms the wobble.

But I do have a hard time resolving how adding a pillion is good compared to loading gear. I suppose the weight distribution of a person is not all up high since the legs are about 30% of the body's mass.
__________________
Dave
-------------------------------------
-K1200 LT, motor(rad)home

Last edited by dukey33; 11-08-2018 at 10:48 AM.
dukey33 is offline   Reply With Quote
Old 11-08-2018, 10:24 AM   #19
bwdmax
Forum Supporter
 
bwdmax's Avatar
 
Join Date: Oct 2010
Location: Victoria
Posts: 1,365
Re: Death wobble video

Quote:
Originally Posted by Jarrett View Post
In general though, is this a thing?

Loaded down bike developing a wobble due to additional weight?
The short answer…..
This is definitely a possibility. Suspension is an important part of a motorcycles handling. The springs are designed to carry or hold a certain amount of weight. The pre-load adjustments are to compensate within a range of weight that a spring can work. When pre-load is adjusted at either end of the bike usually the rear you also change the rake and trail (the angle and relation of the fork to frame) this affects how quick of slow the bike steers. There are other factors with springs such as bottoming or topping out the suspension. When the suspension bottoms out you suddenly load the tire that now acts as a spring of unknown characteristics depending on air pressure, temperature, speed, available traction ect. When you top out the suspension you abruptly unload the tire and remove contact from the tire. In the event that you overload the rear you can simultaneously bottom out the rear and top out the front causing a wobble or other undesirable effect.
Most modern adventure and touring bikes have hydraulic preload adjusters on the rear to allow for quick easy adjustment within the range of the spring. This allows you to add or remove luggage or passenger and retain similar handling with the range of your particular spring. The handling on my Strom is greatly affected by this.
__________________
Avatar courtesy of Tourmeister

Gary
525 EXC & 650 V-Strom (mine)
CRF150F (family) CRF110F (Daughter)
Foreman 450 (family) TRX250R (could be yours)
525 EXC (Son)

http://www.matamoroschildrenshome.org/
bwdmax is online now   Reply With Quote
Old 11-08-2018, 10:33 AM   #20
Jarrett
Forum Supporter
 
Jarrett's Avatar
 
Join Date: Apr 2018
Location: Waxahachie
Posts: 1,116
Re: Death wobble video

Quote:
Originally Posted by JTS View Post
Looking at the video, it doesn't appear that the additional weight would be the issue. Maybe the top rear box or the panniers may cause some issues.
Just out of curiosity, what size guy is your friend?
__________________
The DCT Trio:
2016 VFR1200X
2016 CRF1000L
2012 NC700X
Jarrett is online now   Reply With Quote
Reply

Bookmarks


Go Back   TWT Forums > General Discussion > General

Notices


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:31 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
All Rights Reserved, Scott Friday 2003-18.
vB Ad Management by =RedTyger=
Page generated in 0.24250 seconds with 11 queries