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NJD |
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NJD World Chat Champion
Joined: 11 Mar 2015 Karma :
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Posted: 19:08 - 20 Jun 2018 Post subject: Tucking in behind screen? |
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Thread that's a thread but makes you wonder why its a thread, for larks and interest.
So recently I went on a ride along the faster dual carriageways (60,70) -- that is compared to what I'm used too: 30,40 and sometimes 50 -- and tucked in behind the screen. I wasn't there for long, mind, because my exit approached (literally just a short sprint up and down a stretch of road) so didn't really get to see if it made a difference.
Again, tonight, on a 40 in some wind I caught myself doing it again but popped back up when there was someone beside me and I realised I must have looked like a donkey getting nowhere fast.
The bikes a ZR-7S which, in effect, has an upright seating position and tucking in means not race bike like but more leany forward to try and help air flow over the helmet and reduce drag. It doesn't help I've got a house brick (gopro) on the side of my head, mind, and I realise a lot would have to do with helmet, screen and rider height, perhaps, but have never really bothered with feeling like I need to tuck in before, including riding similar speed roads in the past.
So, in effect, my question, if you like, is does it really make a difference; how many of you do it or am I being a donkey attempted to reduce drag, and wind effect, by "tucking in"?
Might start leany-forward on commutes because "Nice bike, mr." <eyeroll.jpg>. ____________________ The do it all, T̶h̶e̶ ̶b̶r̶o̶k̶e̶n̶ ̶o̶n̶e̶,̶ ̶T̶h̶e̶ ̶b̶i̶g̶ ̶l̶u̶m̶p̶,̶ ̶C̶h̶o̶n̶g̶ ̶N̶o̶o̶d̶l̶e̶ |
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Howling Terror |
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Howling Terror Super Spammer
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Itchy |
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Itchy Super Spammer
Joined: 07 Apr 2005 Karma :
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Posted: 19:19 - 20 Jun 2018 Post subject: |
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It makes a difference. A small one.
On my CBR at motorway speeds ducking behind the screen gives me more speed at a certain amount of revs than not tucking in. It's probably only around 500-1000 RPM though. Less RPM = fuel use similar to how you go up gears.
Way back on my naked bikes doing a superman.
https://keyassets.timeincuk.net/inspirewp/live/wp-content/uploads/sites/2/2017/04/descending-video-still-300x200.jpg
This was the ONLY way I could keep up with Johnny on his GSX1300R on the M62 ____________________ Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching. |
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andym |
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andym World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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yen_powell |
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yen_powell World Chat Champion
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kgm |
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kgm World Chat Champion
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stevo as b4 |
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stevo as b4 World Chat Champion
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 22:37 - 20 Jun 2018 Post subject: |
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Aerodynamics dont have a significant effect below about 6omph.. but frontal area does.
If you look at the old mag tests, they always used to quote two top speeds, one achieved prone, sat up, one achieved 'tucked'. Difference, even on something small and unfaired like a H1oo could be quite marked, like 5mph or so.
On something bigger? Well, to notice the difference in top speed, you would have to be trying to do insta~ban speeds, even on something as mundane as an ER5.
Main reason for getting tucked then isn't to go faster, but take pressure off your upper body and avoid wind buffet, and in that, it can make a much bigger difference, especially on a longer motorway haul. ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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Dave70 |
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Dave70 World Chat Champion
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barrkel |
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barrkel World Chat Champion
Joined: 30 Jul 2012 Karma :
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Posted: 00:02 - 21 Jun 2018 Post subject: |
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As you head into 130-150mph territory you tend to want a bit of shelter from the wind blast, it gets tiring on the neck. I crossed a chunk of Germany like that on my VFR, lower mileage so a few more petrol stops but the speed made up for it.
Didn't make a whole lot of difference under 100mph on the VFR, but I guess it might on a bike where you sit more upright (but the VFR is somewhat upright compared to full-on sports bike). ____________________ Bikes: S1000R, SH350; Exes: Vity 125, PS125, YBR125, ER6f, VFR800, Brutale 920, CB600F, SH300x4
Best road ever ridden: www.youtube.com/watch?v=s2MhNxUEYtQ |
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andym |
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andym World Chat Champion
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Baffler186 |
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Baffler186 World Chat Champion
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Rogerborg |
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Rogerborg nimbA
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weasley |
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weasley World Chat Champion
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weasley |
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weasley World Chat Champion
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recman |
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recman World Chat Champion
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fatjames |
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fatjames World Chat Champion
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chris-red |
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chris-red Have you considered a TDM?
Joined: 21 Sep 2005 Karma :
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DrDonnyBrago |
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DrDonnyBrago World Chat Champion
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stevo as b4 |
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stevo as b4 World Chat Champion
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Posted: 17:28 - 21 Jun 2018 Post subject: |
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It makes a fuck ton of difference on a bike that sitting bolt upright flat out is doing 95mph.
General rule is on big bikes and less generously faired ones, people are tucking in at high speed to reduce noise, buffeting and improve comfort.
On small low powered bikes people are tucking in to tease out that critical last 5-10mph. |
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Itchy |
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Itchy Super Spammer
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Val |
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Val World Chat Champion
Joined: 03 Nov 2012 Karma :
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Posted: 18:57 - 21 Jun 2018 Post subject: |
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Blimey I read this initially as fucking in behind the screen
And I don't have a screen
Other then that seems a good idea... ____________________ Adrian Monk: Unless I'm wrong, which, you know, I'm not...
Yamaha Fazer FZS 600, MT09, XSR 900 |
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NJD |
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NJD World Chat Champion
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redeem ouzzer |
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redeem ouzzer World Chat Champion
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Old Thread Alert!
The last post was made 5 years, 282 days ago. Instead of replying here, would creating a new thread be more useful? |
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