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| Q&A: McKendry on Speed (1810 Posts)
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mods
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On 9/1/2005
David
wrote in from
United Kingdom
(80.3.nnn.nnn)
Ok, thankyou for the advice, The picture link is not my actual board its the one from the bozi website, i am using seismics and 75a flashbacks. The rear is wedged to lessen the steering as much as possible, but what i was trying to say is that when the board is weighted it bends lower than flat and the angle of the rear truck goes back to the angle as if there was no wedge, if you see what i mean. basically the end of the board flexes alot during turns and makes the steering at the back too much. i guess i will have to buy one stable turn seismic for the back and wedge it furthermore. There are drilled holes at the rear to make the wheelbase shorter but they are old pattern. I dont use the board for tight slalom and its definatly a longboard and a great carver. maybe a set of grippins will help too. Anyway thanks for the help, i will ask Jeff Yarrington for some advice on the matter as well. Thanks, David
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Mods
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On 9/1/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
The board is cambered, which lessens the steering front and in back. You've added steering in the front, but not in the back. The back however, is narrower and will flex as much or more than the front. The flex will add rear-steer which could result in over-steering the rear. That's probably the fishtailing that you're talking about.
The other issues could include the MASSIVE wheelbase that you have for a Slalom board - even for GS. On a hard pumping turn, a wheelbase that size will tend to induce a slide. A shorter wheelbase and narrow/precision trucks can help. If those are Avilas, you may also consider trimming the edges of the wheels. If a wheel is super wide and you make make tight turns, the inside edge and outside edge of the same wheel will "fight" with each other because they are travelling along arcs of different lengths (the outside edge wants to spin faster than the inside edge).
Before you try changing any trucks, I'd try:
1. Wedging steering OUT of the rear
2. Shortening the wheelbase
3. Trimming the edges of the wheels
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Flex altering the truck angle
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On 9/1/2005
David
wrote in from
United Kingdom
(80.3.nnn.nnn)
Hi, now i know this is not a question about speed, but i need some help from someone who knows alot about geometry and angles and thier effects on trucks, I hope Chris offer some of his expertise.
I ride a Bozi GS36 deck with seismic quick turn trucks, If you see the( http://boziboards.com/GSsidecomplete.JPG ) picture of the deck you will notice that the camber has been put at the front of the deck giving it a ''loaded'' feel, the rear is flat and narrow so when i stand on the deck the rear dips down putting the angle of the truck slightly flatter which increases the turning. I have put a steep angled riser pad to compensate for the angle change when the deck is weighted, making the baseplate almost parrallel to the ground.
BUT when pumping the board it would flex even more when i carve deep into a turn, now theoretically the harder i push the board into a turn the more weight is on the deck therefore the angle of the rear truck is put flatter making it turn more, giving me a 'forklift effect' where the back is turning so much it is fishtailing and sliding out.
Does this make any sense?? when you pump a board with camber, would the change in angle of trucks be significant enough to alter the turning radius? how can i prevent the rear of my board sliding out on a hard push into a turn? I cannot put any more angled risers on the rear truck as it is getting too high.
Can anyone shed any light on this matter? its been on my mind for a while, Any help would be much appreciatied.
Thankyou David..
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RE: big gummies
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On 8/30/2005
dennis
wrote in from
United States
(216.9.nnn.nnn)
Thats wht Im talking about. I wish I was going to Montreal but new job and work calls. I can wait, those sound like there gonna be hoot of fun.
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Big Gummy Wheels
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On 8/29/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Dennis, Wait until you see what I'm bringing to Montreal! It's not anything that you would guess, but I'll post some pictures after the race, regardless of how well I do.
I think that an 83mm centerset Gumball on a medium sized "low-lock" core would be an awesome wheel. If you look at the Gumball hub as being a 25mm "high-lock" core, a 35mm "low-lock" core would give you give you much depth of urethane, without too much deformation in a turn. Centersets would provide even more traction, and the increase in size would give them a higher top end and let them roll over everything in their path.
I'll make some renderings in a bit...
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big gummi's
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On 8/25/2005
dennis
wrote in from
United States
(216.9.nnn.nnn)
Hi Chris,
I was wonderin if a little larger mm gumball wheel was ever discused as a possibily when you were designing the current Gummi that you have out? Do you think it would be to soft for speed, or to heavy? or maybe harder duro's could be used for hard cornering with a big hunk urathane. Just wonderin...
d
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To No A Vail
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On 8/22/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
I didn't go to Vail this year. If I'm going to hurt my back again, I don't want it to be on a bunny slope.
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chris/rob
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On 8/21/2005
mike p
wrote in from
United States
(69.107.nnn.nnn)
so... did u and rob meet at vail? obviously jimmy and rob raced...
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non-leathers
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On 8/16/2005 duane
wrote in from
United States
(68.15.nnn.nnn)
the abrasion resistance of kevlar and kevlar blends is inferior to leather. Further, there is no way to determine whether a weave fabric is indeed kevlar, nylon, polyester, or some other junkier material when you are standing on the hill. leather is easy to verify
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drop through deck truck placement
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On 8/16/2005
patrick
wrote in from
United States
(207.69.nnn.nnn)
To anyone who can answer this--Can i drop a set of Randall 180 trucks through the top of my big red x speedboard? I saw on Chris's website this can be done by snipping the tabs but i think they were Randall DH trucks. If I can I feel stupid for running a less than ideal setup for the past six months. Thanks
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leather substitute
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On 8/16/2005
panda
wrote in from
France
(82.225.nnn.nnn)
there was a time where chris had kevlar leathers that seemed nice and strong.
kevlar has the reputation to be stronger than leather and more wear-resistant
maybe chris can enlighten us on that subject.
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leathers substitute
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On 8/15/2005
brad
wrote in from
United States
(216.233.nnn.nnn)
looking for a substitute for leathers for downhill
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semantics
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On 8/12/2005
david Price
wrote in from
United States
(67.101.nnn.nnn)
i beat chris in vail last year and i lead robmc down the course in the consi @ maryhill, so that means i'm better than both of you right? anybody is better than anybody on any given day. now if i can just stop trippin on my own wheels....
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vs.
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On 8/12/2005
Jimmy Flindt.
wrote in from
United States
(207.200.nnn.nnn)
WAX, it's more like FLINDt vs. ROB!
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WHAT?
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On 8/12/2005
Jimmy Flindt.
wrote in from
United States
(207.200.nnn.nnn)
Rob, you never ever beat Chris, you got lucky I didn't know where the finish line was, just wanted to clear you big head of false memory, don't take me wrong because I am smiling right now having fun on this subject, you raced well last year but watch what you say about how you advanced, see ya in a few days!
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ROB Vs CHAPUT
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On 8/11/2005 WAX
wrote in from
United States
(67.176.nnn.nnn)
Sounds like you boys have a score to settle next week at Vail...are you coming to Brek Chaput?
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Winning versus Beating Someone
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On 8/11/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Because of the brackets, there's a good chance that most riders won't actually race one another, meaning that they're not in the same heat(s). For example, the #1 and #2 qualifiers won't meet unless they both make it to the finals. It's easier to understand this in a Dual (head-to-head) format. Let's say Chris and Aki are in one semifinal, and Jimmy and Rob are in another. If Aki beats Chris, and Rob beats Jimmy, then Aki and Rob are in the finals. Aki beats Rob in the finals, but Rob still finishes higher than Chris. So the question is one of semantics - did Rob beat Chris? Yes and no. Yes, in that the one person finished higher (2nd place "beats" 5th place). But No, in that most people think that to "bea"t someone mean to actually racing against him and win.
In the race in question, Aki and David Price beat me in one semi, and Will and Rob beat Jimmy in the other. Jimmy and Will would have transferred if Jimmy hadn't of stood up in the stretch. I don't remember there being a consi. If there was, I won it because I finished 5th. Otherwise I would have finished ahead of Rob in the standings because of qualifying. But in the end, Aki won it, David Price fell at the start, and Will couldn't finish his pass on Rob before the line. And Rob has never beat me to the line in a heat.
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Luck of the Draw
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On 8/11/2005 lonerider
wrote in from
United States
(65.249.nnn.nnn)
Derek, I'm pretty sure that you don't have to beat someone over the line to get into the finals. I once got into the finals of a race where some people who were clearly a lot better than me didn't. What can happen:
1.There were too many high seeded people in the same qualifying heat. Since the two (or three or whatever) can advanced out of each heat (regardless of their speed, unless there is like a wildcard format).
2.Someone crashes out of a race, and/or takes out other people with them. Leaving the slow pokes (like me) in the rear to cruise around the pile up to win the heat and advance.
I think Chris said that the latter happened twice in the race, letting Rob place higher than would normally. Again, I know none of the specifics and I'm just hypothesizing.
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The Line
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On 8/11/2005 Derek
wrote in from
United States
(4.18.nnn.nnn)
Well, if Rob was in the finals and you were not, then I think it is true that he beat you to the line, why would you claim he didn't?
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Big Bad Rob
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On 8/11/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Since you haven't provided any context for your claim, I assume that you are talking about last years Vail race. I'm also assuming that when you say that you "beat me", you mean that you finished ahead of me in the final standings, because you have NEVER crossed the line in front of me in a race. If memory serves me, this was the race where Jimmy and Will would have eliminated you to the semis, but Jimmy stood up 100 yards from the finish line allowing you to squeak into the transfer spot because of his blunder. Lucky for you, the finish line had been moved down the road after qualifying. Your luck continued when David Price fell during the start of the finals, guaranteeing you a spot on the podium. Congratulations. You beat me.
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Rob's Wine and Cheese Event
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On 8/11/2005
robertjamesmckendryIII
wrote in from
United States
(71.208.nnn.nnn)
I beat you here last year, mon back. Oh sorry, how is your back? Little Robbie
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Trucks
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On 8/11/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
I've been working "obsessively" on trucks lately. I've been testing out some special features in my prototypes that are not found in other trucks. They are awesome, and will be even better when my cushion molds are popping out a variety of shapes, sizes and duros. It's frustrating work because I can design things in minutes, but it can take days, weeks, or months before a machinist can finish the parts. There's no "instant gratification" in truck design, but I'm confident that the result will be well worth the wait. Stay tuned.
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Liquid trucks
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On 8/8/2005
bpizzle
wrote in from
United States
(67.163.nnn.nnn)
Hey Chris,
I'm in the same boat as Dave...I came across the Liquid Trucks website today and I like what I see. Let us know as much information as you can. Thanks.
-Brian
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72a vs 75a
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On 8/7/2005 Bob
wrote in from
Germany
(62.134.nnn.nnn)
So when life-expectancy of the wheel isn´t so important: would my 72a-Flywheels (101mm) be faster than my 75a´s when just going downhill?
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PINK WHEELS on GMR
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On 8/7/2005
midgette
wrote in from
United States
(207.200.nnn.nnn)
Hello CHrisTopher, another update for you!
Jimmy, John and I went down GMR again this morning, my second time there ever, both times on the PINK PowerBALLS. Today I was obviously more comfortable going down the hill than my first time, so I really got to test the wheels. Not once did they slip out on me while going over cat tracks (from construction vehicles) OR while going through dusty piles of loose debris! And as for carving at midget speed, f*ckin rad! So nice and easy to control. For straight lines and corners, yep, they rock. They're even good for pullin a nice slide at the bottom to slow down!
So now I've tested them on the beach, cruisin carvin runs, and at GMR, and no complaints yet! Just fun. THANKS AGAIN!!!!!! I'll be rockin them at Colorado for sure, I may need a new set by then!
Adios for now, Carly
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