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Nope, no hydroplaning - very Slippery green algae for sure. I was there, rode through albeit on my side and also walked through after the event to work out what happened.


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I guess one positive was I got to put my new and improved GoPro side mount to the test. Thumbs up
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· Mark – Super Moderator
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@Panzermann I didn't want to be left out; if you could do it, so can I. I got going and stopped a couple of Ks down, a GS ride pulled up alongside looking quite annoyed and said he just went over on the causeway.
I learned afterwards from a KTM 1290 Adventure rider at the car wash in Cowes that the best technique is to approach with enough speed so you can pull the clutch and coast through so there’s less risk of the back wheel pushing the front. He’d successfully crossed this particular causeway on the same day and saw a damaged bike nearby. At a Denman cafe that morning we were told of another bike that had gone down the day prior and we also stopped for a Tiger 1200 that had a cracked radiator from falling there - he’d also seen a parked up faller.
The oncoming lane centre wheel track might have been a better option too as the algae seemed to be thicker on the uphill side.
 
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Discussion Starter · #44 ·
I learned afterwards from a KTM 1290 Adventure rider at the car wash in Cowes that the best technique is to approach with enough speed so you can pull the clutch and coast through so there’s less risk of the back wheel pushing the front.
The oncoming lane centre wheel track might have been a better option too as the algae seemed to be thicker on the uphill side.
I like the KTM man's advice, it makes sense to me, having had two slips on ice-like wet, short grass. The rear wheel does not like trying to transmit drive power, even the slightest bit, to the road surface. Whoosh! away goes the rear wheel in a flash.
 

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All good advice and each situation is different. I've lost count of the number of successful crossings and have never encountered anything as slippery as that one and totally unexpected.


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Hydroplane? It seems doubtful that a slippery surface below that puddle would take you down. If I slow the replay down, it sure looks like the front wheel is pushed off the pavement.
Texas Hill Country back roads have a lot of low water crossing like that. If the water has been on the road for a long time it can get very slick from the slime and algae.
 

· Mark – Super Moderator
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… The rear wheel does not like trying to transmit drive power, even the slightest bit, to the road surface. Whoosh! away goes the rear wheel in a flash.
I don’t believe I was transmitting any extra power - the front just folded on me, as it seems to have done with Mike. Any rev rise was due to me falling off the inside of the bike.

My riding buddy on a T120 Triumph sailed right through on a steady throttle. He has a narrower, 18” BT46 front tyre and, likely, somewhat lazier front end geometry. I noticed on our last trip to World SBK in October he sailed through deep gravel roadworks confidently, whereas the Panzer’s front felt very nervous, notwithstanding a light touch on the bars.
 

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ok, slippery.

But something pulled that front wheel to the right.
How about this.... Mike's riding along minding his own business, no death-grip on the grips, but his normal light pressure technique, and the water forces the tire off the slippery pavement, THEN a sudden unknown force of nature causes the forks to rotate, when the front tire reconnects to the road, it tucks due to it being out of line with the rear wheel.

Or something like that.

I've slid many times when cornering over wet/algae/slimey stuff, but when the bike is fully upright, and the tires are aligned, slimeyness can cause a little wiggle but not a total Keflunk. Perhaps Mike was pushing a bit on the left bar and the lack of traction just folded the front, hard to tell.

And physicists in the house?
 

· Mark – Super Moderator
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Bear in mind Jim this is slow speed, through water, over an irregular concrete surface and with the rear wheel pushing the bike, so there are any number of forces that come to play that could push the front wheel a tad out of line, then grip it in a way that makes the front fold, no matter how light the throttle and your grip on the bars. Remember, too, that at low speed you are making tiny corrections to keep the bike vertical - any one of them interrupted by these forces and the traction required to make them effective will have a significant effect on a bike with road geometry and sporting tyres.
The fact that I did exactly the same thing in the same place in mirror image two weeks prior (same direction but falling to the left) says something.
Two mates from the recent Phillip Island trip are travelling to Qld and went through in the opposite direction a couple days ago. The Rockster sailed through OK (maybe the Telelever helps) but very nervous for the Benelli Tre, and lucky to come through unscathed.
 
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An excellent conversation and exactly the reason for posting my short clip. It would great if more forum members shared some of their GoPro / dashcam clips.


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Yes, Yes from an upside position that argument doesn't stack up @Pazermann (n) 😂
 
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No settle down lads and remember which way is UP when you next hop on your BMs, or is it down?
:D



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