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| Q&A: Going Downhill with David Rogers (858 Posts)
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Daves Board
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On 4/12/2005 Brent
wrote in from
United States
(69.232.nnn.nnn)
Put me on the list for "sometime" then.
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Speed
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On 4/12/2005
David
wrote in from
United States
(66.14.nnn.nnn)
Brent: Not sure...soon, sometime or never
pierre: Thanks. I plan to make TC. I have not heard from Chris in a while..hope to see him on a hill soon.
Fredrik: Just a nasty rumor!..ha ha
Aaronw: Rare RB stainless caps for old fly hubs.
Lance: What Joe said!
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Lance's gravity board...?
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On 4/12/2005 mike p
wrote in from
United States
(69.107.nnn.nnn)
i know what a speed board is, but what is a gravity board? I assume you don't produce all of the boards for the gravity skate co...
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Maryhill
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On 4/12/2005
Joe Lehm
wrote in from
United States
(65.19.nnn.nnn)
Lance, Maryhill is THE race to attend, you'll get to ride and learn from the best racers on the best hill imaginable.
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no topic
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On 4/11/2005
Lance
wrote in from
United States
(150.176.nnn.nnn)
Dude, whats goin on? I have been skatin for 8 plus years and my team and i wanna take speed skatin another level. Where should we plan our next trip? Also, i am runnin bones ceramics in my speed board and they hold up great, but i really dont know what speeds they can handle. They are fast though. haha. I have a company that i started and i build speed and gravity boards. They are FAST, talk to me if you are interested. PEACE
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Hub Caps??
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On 4/9/2005
Aaronw
wrote in from
United States
(24.52.nnn.nnn)
Hey Dave in this pic, are those white hubbed flywheels or are they hub caps?
http://www.abec11.com/gmr/DSC_0399.JPG
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?
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On 4/7/2005 Fredrik
wrote in from
Sweden
(217.208.nnn.nnn)
Are we talking about a Rogers Bros built speedboard?
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But where's Chris?
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On 4/7/2005
pierre
wrote in from
Canada
(24.202.nnn.nnn)
Hey Dave and John you do an awesome job as host.
Are you coming again to race at Top Challenge in september?
Where's Chris by the way?
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Aluminum Board
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On 4/6/2005 Brent
wrote in from
United States
(69.233.nnn.nnn)
When do we get to buy those sick boards
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Wheel Speed
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On 4/6/2005
David Rogers
wrote in from
United States
(66.14.nnn.nnn)
Darryl...you are way off!! Roger was close but messed up the circumference value. Here is a simple formula for all speeds and all wheel sizes:
RPM (of wheel)= (MPH/mm)* 8538
Example: 70mm at 100mph
RPM= (100/70)* 8538
RPM=(1.4285)* 8538
RPM=12197
at 100 miles per hour:
70mm...12197rpm
76mm...11234rpm
83 mm...10286rpm
Darryl..The bearings can easily handle the speeds. I think you should balance the wheels before you take a crack at 100mph. I think I would go with some 83 Fly's if I was going to try it...but I'm not...ha ha
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Where are we going this year?
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On 4/6/2005
David Rogers
wrote in from
United States
(66.14.nnn.nnn)
GI Joe...Thanks for the invite for the Outlaw race. I hope to make it... I'm still trying to figure out my schedule for the year. I was bummed to miss the I.S. race last year and welcome any excuse I can get to skate in New Mex. John and I hope to make a few Timeship events this year.
panda... The race in Sweden last year was a great time. The guys and girls we met are awesome and Peter did a fantastic job with the race. WARNING!!:Try not to look at ALL of the HOT women while in Stockholm or your neck will be very sore before the race even starts!! ;) I don't think either of us are going to make it to europe this summer but a freeride at Chamrousse is on my list of things I MUST do.....possibly Chamrousse in 2006!!
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RPM
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On 4/6/2005 bean-a-reano
wrote in from
United States
(216.89.nnn.nnn)
Aren't gumballs 76mm?
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rpm
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On 4/5/2005
roger
wrote in from
United States
(130.166.nnn.nnn)
Chaput would love this question!
1 millimeter = 0.039 inch
1 mile = 5283 feet
Wheel circumference
= Diameter * Pi
= 70mm * 3.1415
= 220mm
= 8.57 inches
= 0.715 feet
Revolutions per mile
= 1 mile / wheel circumference
= 8283/0.715
= 7392
RPM
= miles per hour/60 * revolutions per mile
= 100mph/60 * 7392
= 12,320rpm
For comparison, dental drills are somewhere in the 50K to 100K rpm (I think).
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wheel speeds
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On 4/5/2005
darryl
wrote in from
United States
(24.161.nnn.nnn)
whats up R.Bros?
OK Im late for work so this may be quick and sloppy.
I have something on my mind, looking for answers that are not known yet,
due to many elements involved that could change the situation.
I did some math the other day (not joking) to see how fast(rpm) a GumBall(70mm)would be turning at 100mph. My answer 134,454 rpm @100mph.
Please, will you double check my answer.
My first thought was Holy Shi? I cant think of anything that turns this fast!
Q: what is the physical limit of rpm's (like terminal velocity) for a quality 608 bearing. How about a quality 70mm wheel?
I considered jacking up my car, having someone eccelerate as I apply a sk8 wheel to the drive wheel of the car. This could be a good test, but not a duplicate of all conditions. Besides I keep thinking of
Ferris Bueler-Bueler-Bueler.
Could a skateboard roll beyond 100mph?
Waldo luged down the highway from mammoth at 90 plus for aprox 8 miles, wheels and bearings handled.
Ok gots to go!!!!
Thanks
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MTV's True Life Documentaries
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On 4/5/2005
Adam
wrote in from
United States
(198.144.nnn.nnn)
Speed lovers may want to check out a recent post from MTV on our Street Luge forum..
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rogers in france
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On 4/5/2005 panda
wrote in from
France
(82.225.nnn.nnn)
Hi dave and john,
Are you coming to are this year ? I heard you were last year. I'll probably be there too this year and hope you can stay a while in europe and attend some of our (now famous) freerides like chamrousse (july 15-17) which is a 7 mile road not unlike GMR I hear completely closed and hay-bale'd
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Grip
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On 4/4/2005
David Rogers
wrote in from
United States
(66.14.nnn.nnn)
Peanut: Split durometers are showing up more on speedboards theses days. Sounds as if you like the feel for your speedboard. I ran a 75a/72a split for a while but never noticed any difference when compared to running the 75a all around. I think the riders that slide/drift the turns seem to like riding on split duros.
On a luge, a majority of the weight is usually over the front wheels. I prefer running 4 wheels in front/2 rear for my luge. This setup keeps the front of the luge from "pushing" and allows the rear of the luge to break traction first. I prefer this "over steer" when the luge begins to slide. I have used split duros on my luge also but tend to stay with the softer 75a compound all around. The harder duros never seemed as fast on the typical rough road surfaces encountered while riding and racing. If you are running only 2 wheels in front or are riding on a really smooth surface, I think split duros might help.
On my luge, I run the front(2)trucks very loose with soft bushings (black/black) and the rear significantly tighter with a bit harder bushings (blue/black).
Wet roads are not my area of expertise, but I have raced in the rain quite a few times. It seems that aquaplaning is not the big problem..the problem seems to be the very small coefficient of friction that exists between wet urethane and the road. Grooves never seemed to help me much...rubber wheels are a bit slow for racing. I suggest practicing in wet conditions to compare the traction of various setups, wheel types and durometers...be careful! Remember that your "brakes" don't work well in the water for the same reasons...lack of braking ability seems to cause as many crashes as the lack of wheel traction.
David
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GMR
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On 4/4/2005
Flavien
wrote in from
United States
(209.129.nnn.nnn)
Hi, I planned to go riding GMR the day before Cal DH #4...
The only (little :)) problem is that I don't know the exact location of the spot...
Could you guys tell me via email or via the forum where it is?
Maybe that you've palnned to ride there this day too... That would be great for me to with you...discovering this American Chamrousse :)
See you at the contest anyway
Bye
Flavien
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Abq Outlaw Invitational
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On 4/4/2005
Joe Lehm
wrote in from
United States
(65.19.nnn.nnn)
Hey there Dave and John! Good to see you have an audience interested in talking about the forum subject!! Been over to the Hackett / Olson forum latley? Nice banners. TimeShip Racing wants to make sure that you know you are formally invited to race in the Outlaw Invitational May 28th and 29th. All details are on the contest calendar, the only thing missing is your names!! Last year Will won the Indian School race and this year it could be you or me....if he falls.
Joe
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Grip?
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On 4/3/2005
Peanutt//
wrote in from
Netherlands
(62.163.nnn.nnn)
Hi, was wondering where the grip is the most on a luge: front wheels or the rear wheels. Let me say it in a different way: Where is the most grip needed? With stand up, I prefer softer wheels in the rear. Would the same principle as often used in slalom also count for luge? Should one tighten the rear truck more as compared with the front, as descibed a few postings before?
What do you guys do to prevent aquaplanning during a rain run? Do you use special wheels (Rain bombs for example by Xtreme Wheels)or the regular good old Abec's / Krypto's? I can immagine a luge s getting pretty slippery when wet, entering a highspeed corner.......
(never bombed a hill when it was wet with stand up; no experience with wet road conditions)
Thank you for the answers in advance!
-Peanut//
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doh!
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On 4/1/2005
David
wrote in from
United States
(66.14.nnn.nnn)
forgot to turn on the color
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Big Balls, Bushings, Bearings
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On 4/1/2005
David Rogers
wrote in from
United States
(66.14.nnn.nnn)
aengus..I tend to agree..I think. Having big balls can help quicken the learning curve when it comes to being comfortable and stable at speed. The downside to having big balls is that small errors in judgment can result in severe injury or death. Staying calm, focused and confident is a must for going really fast. I prefer to slowly gain confidence by way of experience and practice, and not put myself in positions where the outcome is uncertain. In other words..I'm a puss! ha ha! Big balls might work if you are young, skilled and still bouncing off the pavement...otherwise, practice, practice, practice.
roger..How is the leg? Ready for some GMR soon? To be honest, I have not played with the bushings in my speedboards in some time. For my speedboard, I like the big black Randal bushing on bottom and run the tall red Randal(from older 150R2's) on the top. I never liked the feel of the small black top bushing. I run my trucks fairly loose and the bushings don't really look deformed or feel "dead". I might be surprised if I change them out for fresh ones...I should give that a try! JimZ has some new bushings out that look promising. On boards I use for slower carving, I like the feel of soft springy urethane bushings like old tracker stims, bones hardcores, khiro or radikal.
kludy..remember Gary's old bearings? I tend to follow his school of thought a bit when it comes to bearings. Years ago, I used to spend a bunch of time and money on bearings...what a waste!! Bearings don't account for squat. If your bearings are fairly clean and not badly worn or damaged you are good to go. John and I have done numerous side by side test runs when one of us has changed to the latest and greatest ceramic, swiss, 6 ball, 9 ball, 8 ball, abec7, abec9, moc10...blah blah blah while the other bro. rides the same old crunchy bones reds. Bearings really don't make a difference and the faster you go, the less they matter..strange but true! The only bearings I have killed are bearings that have been abused..ridden in the rain, ridden dirty, and never cleaned/re-lubed..downhill speed alone will not kill a good bearing.
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Since your here
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On 3/31/2005 Kludy
wrote in from
United States
(205.188.nnn.nnn)
Do you guys change your bearings alot?Do you run new bearings every race and do they go bad at speed? Stand-up only.I race you guys and I hope its OK too pick your brain.Haaaaaaaaaaaaaaaaah ,why? Because you are soooooooo hard too beat.
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bushings
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On 3/31/2005
roger
wrote in from
United States
(71.105.nnn.nnn)
I used to ride with my trucks pretty tight, but over time the bushings lost their rebound. I was lucky to come across another set of Randal black bushings. To prolong their life, I loosened the trucks when storing the gear – this way the bushings where not under constant pressure. They lasted a little longer, but I had to constantly re-adjust them when I went riding. I am thinking that having a supply of bushings is the way to go. Nice fresh bushings sure do have a good feel to them!
How do you guys deal with bushings?
Any recommendations for replacements?
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Cajone
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On 3/31/2005
aengus
wrote in from
United Kingdom
(193.113.nnn.nnn)
My thoughts have always been that its actually an easier discapline to get into its just that the penalty for any mistake is huge. For me its always been about a sure knowledge of your limitations, that and alot of confidence. That way you can push yourself to the maximum and thats when you find out what really goes on at 30-40+ I aliken it to all that media hyperdrive sh@t, although your goin faster, things go earily quiet and slow down, the brain focus's past normal paramaters. Necessity is a beutiful thing.
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