Guess they changed the '06's gearing!

[Fred H.]

Yea, I put a NEP thottle lock on it, but the road I was on had some hills and curves and traffic and it was real dicey getting the upper end measurements. Also, the tac only has hash marks every 500 rpm and they are pretty close together, so I had to make some guestimates. I tried to be as accurate as I could, and I suspect the measurements below 80 are all very close.

 

[Knifemaker]

Er, what's wrong with this picture? You got variable top gear or sumpin'? 500 RPM to go from 66.3 to 75.1. Then, an additional 10 MPH for 500 RPM's from 75.1 to 85.6? Then 800 RPM needed to get from 85.6 to 94.6? I'm just not getting it...

You are under the false impression that power/speed is linear...

KM

 

[twowheelnut]

Well, there obviously is some error in taking the measurements on a moving bike at high speed while trying to hold an exact constant RPM while simultaneously reading three instruments at once. The parallax error on the speedo and tach alone are enough to induce error, as is the difficulty in holding the RPM exactly steady and the speed constant at 90mph. I did the measurements as accurately as I could.
Also, I do not recommend trying this above 100mph, as it gets very dicey holding it steady while trying to take precise readings off the gages and keeping the bike between the ditches. As the speed increased, so did my induced error.

Eh, you're a wuss! Try video taping while holding a video camera at the various speeds so we can make some sense of the info then, wouldja? And don't worry about what's in front of you... It's for the good of the forum, after all!

As for your use of parallax - watch those $5.00 words, too. Skooter's brain can only deal with so much. As it is, he's having a tough time with See **** Run.

Hugs and Kisses,

TWN

Er, what's wrong with this picture? You got variable top gear or sumpin'? 500 RPM to go from 66.3 to 75.1. Then, an additional 10 MPH for 500 RPM's from 75.1 to 85.6? Then 800 RPM needed to get from 85.6 to 94.6? I'm just not getting it...

You are under the false impression that power/speed is linear...

KM

Power and speed's got nuttin' to do wit it. Gears don't give a **** about power.

 

[SkooterG]

You are under the false impression that power/speed is linear...
KM

Eh? Power has nothing to do with it. Its a direct relationship between RPM and gearing, and therefore wheel rotation and speed.

And for chrissakes TWN, leave poor Fred alone. That was a "good 'nuff" table for some quick measurements. You want better? Go do it yerself, you twit.

Oh yeah.....

 

[Ari Rankum]

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

5--------------------65------------3.4K-------61.8

5--------------------70------------3.6K-------66.3

5--------------------78------------4K---------74.2

5--------------------80------------4.1K-------75.1

5--------------------90------------4.6K-------85.6

5-------------------100------------5.2K-------94.6

5-------------------105------------5.5K-------100

Er, what's wrong with this picture? You got variable top gear or sumpin'? 500 RPM to go from 66.3 to 75.1. Then, an additional 10 MPH for 500 RPM's from 75.1 to 85.6? Then 800 RPM needed to get from 85.6 to 94.6? I'm just not getting it...

There are only two significant figures in the RPM table. Remember significant figures from 8th grade science? Me neither, but I remember Ms. Pettibone's ass. But I digress. The value you are concerned with is MPH/KRPM. Using the RPM from the table limits the result to two significant figures. Forming all the ratios:

61.8 MPH/3.4KRPM = 18 MPH per 1K RPM

66.3 MPH/3.6KRPM = 18 MPH per 1K RPM

74.2 MPH/4.0KRPM = 19 MPH per 1K RPM

75.1 MPH/4.1KRPM = 18MPH per 1K RPM

85.6 MPH/4.6KRPM = 19MPH per 1K RPM

94.6 MPH/5.2KRPM = 18 MPH per 1K RPM

100 MPH/5.5KRPM = 18 MPH per 1K RPM

In other words, the results seem consistent. I would chalk the two 19 MPH results up to measurement error/resolution.

 

[Mike-H]

TWN going after SKOOTER....do you all feel the love? :yahoo: ....life & the forum back to normal....as it should be :argue: :headbonk: :ranting2: :russian_roulette: ...it's just good to be home

 

[twowheelnut]

Remember significant figures from 8th grade science? Me neither, but I remember Ms. Pettibone's ass. But I digress.

Now that is some funny ****, right there! :lol: I remember Ms. Turbak's, er, back. Woof! :dribble:

Your mathematical conclusions kinda make sense, but something still seems amiss... Oh yeah, skooter posted something. I knew there was a 'miss' somewhere here! :****:

 

[Knifemaker]

" Power has nothing to do with it. Its a direct relationship between RPM and gearing, and therefore wheel rotation and speed."

Yes, you are correct. I was confused and thinking about something else which would not apply here.

I get that way late at night if I didn't get to ride durring the day...

KM

 

[RadioHowie]

" Power has nothing to do with it. Its a direct relationship between RPM and gearing, and therefore wheel rotation and speed."


Yes, you are correct. I was confused and thinking about something else which would not apply here.

I get that way late at night if I didn't get to ride durring the day...

KM

Oh my aching ******...STAND UP FOR YOUR STATEMENT!! [SIZE=8pt](even if it's patently wrong. )[/SIZE]

 

[Bluebullet]

61.8 MPH/3.4KRPM = 18 MPH per 1K RPM66.3 MPH/3.6KRPM = 18 MPH per 1K RPM

74.2 MPH/4.0KRPM = 19 MPH per 1K RPM

75.1 MPH/4.1KRPM = 18MPH per 1K RPM

85.6 MPH/4.6KRPM = 19MPH per 1K RPM

94.6 MPH/5.2KRPM = 18 MPH per 1K RPM

100 MPH/5.5KRPM = 18 MPH per 1K RPM

Using said data the new top speed for the 06 is then 162mph or so. Can we get a live test? Maybe the bikes Yamaha is bringing to WFO, Where is a long straight road near Reno?

 

[donaldb]

61.8 MPH/3.4KRPM = 18 MPH per 1K RPM66.3 MPH/3.6KRPM = 18 MPH per 1K RPM

74.2 MPH/4.0KRPM = 19 MPH per 1K RPM

75.1 MPH/4.1KRPM = 18MPH per 1K RPM

85.6 MPH/4.6KRPM = 19MPH per 1K RPM

94.6 MPH/5.2KRPM = 18 MPH per 1K RPM

100 MPH/5.5KRPM = 18 MPH per 1K RPM

Using said data the new top speed for the 06 is then 162mph or so. Can we get a live test? Maybe the bikes Yamaha is bringing to WFO, Where is a long straight road near Reno?

At the rate of speedo error in relationship to actual speed, I'd say they end up slower than all the rest--speedo speed shows 162 then the gps speed should be about 142, gotta be all that extra weight

 

[Knifemaker]

[

Oh my aching ******...STAND UP FOR YOUR STATEMENT!! [SIZE=8pt](even if it's patently wrong. )[/SIZE]

Well, the statement is NOT WRONG, it just does not apply. Power to Speed is not linear because it takes more power to overcome air ressitance the faster you go..e.g. at 20 mph you are only using 5-10% of your engines horsepower to overcome air ressitance, and at 100 mph you are using around 90% of the horsepower the engine is making to overcome the air.

Which means if you could remove our atmosphere, but still maintain gravity, you could build a bike capable of speeds over 200mph using a 5hp lawnmower engine. (How you would get the fuel to burn without air is your 2nd problem, removing our atmosphere would be the first)

KM

 

[Rickster]

Knifemaker -- you could use hypergolic fuels, or take a bottle of ox with ya.

 

[Knifemaker]

Knifemaker -- you could use hypergolic fuels, or take a bottle of ox with ya.

Well, you would need a bottle of oxygen for sure...for the rider.

KM

 

[Bluebullet]

OK so assuming u can get the motor to run and the driver to not turn blue you still have to gear the 5 hp high enough to go 200. The FJR has a power to weight ratio that atmosphere drag has very little effect on its top speed. This has been proven by the fact that it will go 156 with bags on or off windshield up or down passenger or no passenger. It is not the drag that is limiting it it simply runs out of available rpm to turn the rear wheel faster. I have reason to believe that the new taller gear will still not be affected by drag when it comes to top speed either. It would be fun to test and find out though B)

 

[Knifemaker]

OK so assuming u can get the motor to run and the driver to not turn blue you still have to gear the 5 hp high enough to go 200. The FJR has a power to weight ratio that atmosphere drag has very little effect on its top speed. This has been proven by the fact that it will go 156 with bags on or off windshield up or down passenger or no passenger. It is not the drag that is limiting it it simply runs out of available rpm to turn the rear wheel faster. I have reason to believe that the new taller gear will still not be affected by drag when it comes to top speed either. It would be fun to test and find out though B)

And that's the wonderful thing about bikes with this much horsepower, they will go fast... But air drag still plays its part here, as it does effect how quickly you can get up to that 156 mph. It may be a small amount given the amount of horsepower available, but it is there. The real proof of this effect is when you try building something that goes twice that fast...not to mention the annoying problem of your creation trying to take off from the ground.....

KM

 

[worldbound4now]

Ari, I like the way you think.

Taller gearing with this much horsepower makes certain that the top speed will be greater than on previous years. Drag from the air and wheels on the ground can easily be overcome by this engine.

 

[SkooterG]

Drag from the air and wheels on the ground can easily be overcome by this engine.

Not necessarily.

Air resistance at 160mph is significant. You may be right about top speed, as theoretically, new taller gearing will get top speed closer to max power in the RPM band, but I would definitately not use the word "easily". From one that has been there, the FJR is running out of steam at max speed.

Remember, air resistance increases with the square of speed. So doubling the speed results in 4 times the air resistance. Very significant as the speed starts climbing.

 

[Pjturbo]

There will be lots of 03s, 04s, 05s, and 06s at WFO and lots of roads that will accomodate high speed. So a test will put this to rest. I'm also sure that you could get the state patrol to monitor the speed and give every participant a slip of paper with his speed on it. Of course the entry fee will be quite high but it's in the name of science.

Phil

Seattle

 

[twowheelnut]

Remember, air resistance increases with the square of speed. So doubling the speed results in 4 times the air resistance. Very significant as the speed starts climbing.

Especially when you figger in the size of that big friggin' water head and stoopid hat!