Down hill?  Big girl, is she?


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Quote from: Clutchup210 on January 25, 2015, 11:07:07 PM
Alone on the highway?

speedlimit +15mph

With the group I ride with? (where I have the least powerful bike by far)

top speed 116.

I got her up to 121 with my girlfriend on the back once... no idea how that happened, but it did.

121 with pillion?  Hmmmm. .. thinking thinking.....

!! ... secret aerodynamic drag coefficient increase!!

The lesser turbulence overcomes the increase in weight?!

Quote from: GS500Schultz on January 25, 2015, 09:06:57 PM
you sir have solved 90% of my life issues...
now i just need to fill it with vodka lol

Vid's Hungarian, so you won't understand what they're saying, but it's pretty well explained anyway

Quote from: Atesz792 on January 24, 2015, 04:12:55 AM

Quote from: MeeLee on January 24, 2015, 02:16:24 AM
You could go faster with a 17t front tooth, or reduce rear tooth by 3t.
You should aim to have 8500rpm at top speed.

No, you can't, stop spreading your BS.
Stock top gear is already overdrive, you can't reach redline in 6th. A 17t sprocket would help if the redline was your limiting factor...

gsJack just gave YOU the answer you needed.
The bike makes top HP at 8500RPM, all you need to do is make sure you're close to 8500RPM at top speed (mine is 112MPH indicated); and the way to do it is through a sprocket change.

Quote from: Clutchup210 on January 25, 2015, 11:07:07 PM
Alone on the highway?

speedlimit +15mph

With the group I ride with? (where I have the least powerful bike by far)

top speed 116.

I got her up to 121 with my girlfriend on the back once... no idea how that happened, but it did.

Sometimes a small downslope, and a tail wind can help out a good 10MPH.

If there's a headwind, the wind gets fatiguing over 80 MPH. Power starts to drop over 90 MPH. I've topped out around an indicated 120 MPH and didn't feel uncomfortable at all, but the bike really had to work to maintain that speed.

Quote from: twocool on January 26, 2015, 12:09:18 AM
Down hill?  Big girl, is she?

No to both, dead flat (could have been slightly downhill, but we're talking <10degrees) and she's on the average to skinny side, as am I.

I'm almost certain it was the collective soul of Suzuki reaching out, in response to her telling me "[Our friend] took me up to 80mph on his bike, (an 09 r6) and he said that was really fast for two people!"

https://www.youtube.com/watch?v=KTwnwbG9YLE

Quote from: Clutchup210 on January 28, 2015, 12:22:48 AM

Quote from: twocool on January 26, 2015, 12:09:18 AM
Down hill?  Big girl, is she?

No to both, dead flat (could have been slightly downhill, but we're talking <10degrees) and she's on the average to skinny side, as am I.

I'm almost certain it was the collective soul of Suzuki reaching out, in response to her telling me "[Our friend] took me up to 80mph on his bike, (an 09 r6) and he said that was really fast for two people!"

Seriously now...well....121 indicated is believable....

With speedo error figured in... it's right about 108 MPH "true"....this is Dr. Jacks "magic" number, where the Sun, Moon, Planets and Stars all line up!   (HP, RPM, Gear ratio in 6th, Top Speed)

Two up riding COULD possible improve aerodynamics...smoother airflow due to  the second person.
Less drag...more top speed..

ANY down hill...and two up is a big advantage to top speed....an extra 100 lbs....when you do the vectors, you see that the gravity vector gets bigger, therefore the "normal" force of the hill pushing, gets bigger, so the resultant force along the line of travel gets bigger...this means you can over come more drag...means higher top speed....

A 10 degree hill is a really steep hill...it would  be considered almost 20% grade...

So if the road "looked" flat....it was probably less than one or two degrees....but this still makes a big difference in top speed...as would a tail wind....

Our sailplanes go easily 60 MPH when flying downward at less than 2 degrees....At 5 degrees we can go 200 Kilometers per hour....(125 MPH)....this is speed achieved without any propulsion at all...just using the energy from gravity alone!...

For "racing" we fill the wings with water, to add a few hunderd pounds...Contrary to what , at first, is logical,... A heavy glider will ALWAYS go faster than a lighter one!


Cookie

Quote from: Clutchup210 on January 28, 2015, 12:22:48 AM

Quote from: twocool on January 26, 2015, 12:09:18 AM
Down hill?  Big girl, is she?

No to both, dead flat (could have been slightly downhill, but we're talking <10degrees) and she's on the average to skinny side, as am I.

I'm almost certain it was the collective soul of Suzuki reaching out, in response to her telling me "[Our friend] took me up to 80mph on his bike, (an 09 r6) and he said that was really fast for two people!"

Heavier glider..  water wings. . . . Wow!!! ..  now that's some curious and interesting info!  

Would never have thunk it! ... is that just for gliders/other unpowered aircraft? .. or does it factor in with all aircraft?  ...

Brain still going. . Yeah but nah! Yeah but nah!! Lol

Applies to anything going down hill...

Glider, airplane...motorcycle...soap box car...bowling ball...bicycle....

Now level....as in airplane flying level...weight is a bit of a penalty...

And going UPHILL...well...weight is bad bad bad...

Here's the principal....

1) height is energy...the higher up something is... the more stored energy it has..
2) more weight at a given height is more energy than lighter weight..


So let's say we have 2 bowling balls....both up a 10' high hill......

But one ball weighs 8 lbs...and the other weighs 16 lbs...

The 16 lb ball has twice the energy!!

So if we let the balls roll down the hill...at first they will slowly start rolling.. and at the same speed....

But as the speed increases...drag from air increases...holding the balls back....

soon the balls will reach a speed where the drag is so great that the balls will not go any faster...they will just keep going at one steady speed...

But since the heavy ball has more weight (energy)..it can push harder against the drag of the air...so it reaches a faster speed before it evens out to one steady speed....

When they explain all this stuff in science class...they always assume the balls rolling in a vacuum, on a frictionless surface...if that were the case the balls would roll down the hill at the exact same speed, no matter what they weighed...and they would keep going faster and faster...


Bottom line...your motorcycle will have a faster top speed DOWNHILL with a rider on the back, than it would solo......up hill, the two up bike would be MUCH slower than a one up bike...


Cookie

Quote from: Janx101 on January 28, 2015, 08:58:14 AM
Heavier glider..  water wings. . . . Wow!!! ..  now that's some curious and interesting info!  

Would never have thunk it! ... is that just for gliders/other unpowered aircraft? .. or does it factor in with all aircraft?  ...

Brain still going. . Yeah but nah! Yeah but nah!! Lol

Quote from: twocool on January 28, 2015, 09:32:16 AM
Applies to anything going down hill...

Glider, airplane...motorcycle...soap box car...bowling ball...bicycle....

Now level....as in airplane flying level...weight is a bit of a penalty...

And going UPHILL...well...weight is bad bad bad...

Here's the principal....

1) height is energy...the higher up something is... the more stored energy it has..
2) more weight at a given height is more energy than lighter weight..


So let's say we have 2 bowling balls....both up a 10' high hill......


Bottom line...your motorcycle will have a faster top speed DOWNHILL with a rider on the back, than it would solo......up hill, the two up bike would be MUCH slower than a one up bike...

Ditto, I ride road bike (bicycle). And we have a Husband + Wife tandem crew in our group. Down one certain hill I can i can reach terminal velocity (just me on my single road bike) without pedaling at about 38mph. The tandem will reach will pull away from me like they have a motor. They usually reach about 46mph. Wait till an uphill grade though.. They work like a dog and go about as fast as turtle
This however is down a pretty steep grade.
I was just about to say that i small grade wouldnt have much of an effect.. but then I thought of pedaling on false flats (those roads you think are flat but really arent.) Pedaling up a false flat is a CHORE! Its pure torture. Going down a false flat you'd swear you could keep with Lance Armstrong without breaking a sweat. And you dont even realize that youre changing elevation..

Which brings me to another observation: HWY 76 traveling from Nebraska into Denver, CO. Fuel mileage on my bike was lower, and the water temp was up a little hight. It looks relatively flat, but you climb probably 3500ft in elevation from North Platte to Denver.
The motorcycle is definitly working a bit harder, even though you swear its dead flat!

Back to the core of the Conversation..

I dont like that thing at more than 100mph. It just doesnt feel like the bike is happy to be at that speed.

My FZ6 on the other hand, stable as a rock over 100. And gets there in a quick Hurry!!

Yep...back in the day...I was a semi pro bicycle racer....

You learn quick about headwinds, tail winds, drafting, hills, and gearing.

Tandems are cool...never rode one, but we also had a few of them who rode with us on training rides....You have to figure it this way...they have 2x the horsepower, but only 1 x the frontal area...so they go good on the flats, or down hill....

BTW...  I once met up with a guy who was riding a fully enclosed (faired) three wheeled recombent bike....It looked slow to me....on the flats we were about equal, maybe my normal road bike was even a bit faster.....uphill that bike was a real dog...heavy...but down hill...I just could not keep up no matter what I did!   And there was not much of a slipstream to draft in...


Cookie

[/quote]

Ditto, I ride road bike (bicycle). And we have a Husband + Wife tandem crew in our group. Down one certain hill I can i can reach terminal velocity (just me on my single road bike) without pedaling at about 38mph. The tandem will reach will pull away from me like they have a motor. They usually reach about 46mph. Wait till an uphill grade though.. They work like a dog and go about as fast as turtle
This however is down a pretty steep grade.
I was just about to say that i small grade wouldnt have much of an effect.. but then I thought of pedaling on false flats (those roads you think are flat but really arent.) Pedaling up a false flat is a CHORE! Its pure torture. Going down a false flat you'd swear you could keep with Lance Armstrong without breaking a sweat. And you dont even realize that youre changing elevation..

Which brings me to another observation: HWY 76 traveling from Nebraska into Denver, CO. Fuel mileage on my bike was lower, and the water temp was up a little hight. It looks relatively flat, but you climb probably 3500ft in elevation from North Platte to Denver.
The motorcycle is definitly working a bit harder, even though you swear its dead flat!
[/quote]

As for "comfortable" speed on the GS500...I like the  posted speed limit  plus or minus a couple MPH....

I not in a hurry...I'm not trying to prove anything to anybody or myself...

Other than long continuous highway driving...going real fast and driving like a maniac..doesn't really get you there all that much faster anyway...

One of my "hobbies" is driving the speed limit...letting a tailgater pass me...and then seeing what happens 10 miles later...usually I end up catching them at every red light....or they pass me only to get caught up in traffic ahead...or by a stopped school bus...or they suddenly see a cop parked with radar, and they slow way down...it's really comical...


Cookie

Omg I totally agree with that... I let tailgaters pass me too. I don't intentionally slow down to piss them off or speed up just to make them happy... just let 'em by so they can do what they want and I most often times end up laughing at them when I see them again. Glad to know I'm not the only one that feels this way!

Cool thanks guys! .. yeah it was in my head about ground vehicles being heavier/faster downhill ... seen a b-double semi truck (two trailers linked by a extra turntable on end of front trailer) grossing at about 70ton roll in angel gear down a freeway slope ... topped 160km/h! ....

Just didn't make the mind leap to aircraft! Lol. .. makes sense now it's explained. .. but in my head it wasn't working! ... I'm always open to learning new stuff. .. mostly. ..... and pineapple donuts!

Oh and a occasional driving hobby. .. watching out for p platers that are driving like dickheads! On the freeway mostly. .. listening on the cb radio for trucks calling LEO radar traps. ... pacing the p platers and gradually speeding up a bit. ... they usually want to roar ahead. ... straight into the radar/laser trap. ... by which time I have dropped right back again. .. it's not very fair or nice really. .. but it's a learning experience for them!