Applied Math and Physics

22
Aug
2011

Heard in at least one car returning from Speed Week:

“… so if kinetic energy goes as the square of velocity, it does matter what the thing weighs! Because to gain velocity, you’ve got to deliver enough power to add that much kinetic energy, right? Before the motor blows up… and before you run out of salt”

Well, really, that last concern’s not realistic. If you’re fast enough to put your wheels on the long course, you have five miles to accelerate. It only took three for the Poteet & Main streamliner to get to 408 m.p.h. There’s plenty of runway.

Pressure, temperature, friction. I tell ya, it’s just like science class.

“What was the record in K-BGCC again?”

Things That Go Bump In The Night

8
Aug
2011

Goblins, Ghouls, Vampires, and other assorted nocturnal beasts? No, I’m talking about rally cars at Heart of Darkness (HoD)! Okay I suppose there could have been some nocturnal beasts inside the rally cars, I didnt vet all the cars personally for fear of my life. I mean if i had wandered up and down the line of cars with a cross, garlic, and what not acosting competitors trying to take a cat nap between regs, some perfectly normal but irrate person would have taken me out. But that’s really outside the scope of this post.

Starting in Hope B.C. at 9:30 P.M., HoD is an overnight event going up to (and around) Merritt and finishing back at Hope, at 6:30 A.M. The CASTs were brisk but doable and the dust was relatively light (especially in car# 1). The roads were rough at times, reminded me of Coast to Coast on occasion, indeed much like C2C not all cars finished (lost one worker and one competitor car) although there weren’t any flat tires. At times the route book would drop out of focus or I would split the computer and have no idea what to do next, but that is all part of the challenge of an all night event.

It was a fun little event, definitely a great first rally from Jeremy Baxter and I am looking forward to the next time it gets run.

Max and I teamed up for the first time, with decent results. First in class (unlimited) and second overall, one second behind the Damms (first in historic).

Here are the results:

3 Marinus Damm/Renee Damm  1st historic, 1st overall  – 7 points

1 Max Vaysburd/Marvin Crippen 1st unlimited, 2nd overall – 8 points

2 Steve Perret/Kathryn Hansen 2nd unlimited, 3rd overall -29 points

5 Gary Webb/Jim Breazeale  2nd Historic, 4th overall -  58 points

7 Norman Hayton/Kristin Holmes 1st Novice, 5th overall – 114 points

6 Alex Kouzmin/Stan Kouzmine 1st Calculator, 6th overall – 176 points

8 Adam Clees/Darsi Sullivan 2nd Novice, 7th overall -  303 points

4 Jason Ross/Genevieve Fox  3rd Historic, 8th overall – 925 points

10 Scott Mason/Jon Bowman 3rd Novice, 9th overall – 1212 points

9 Lada Gorlenko/Oleg Ryabukha Novice DNF

An excellent weekend on the Eastside

8
Jun
2011

For No Alibi this year, I changed seats, and ran as a navigator with Steve Perret . Steve’s got years of autocross experience and done thousands of miles on stage rally roads, which is why his nickname is “Smooth”. With so little experience co-driving, my nickname last weekend would have been “Spaz”.

We ran in the Equipped class. In the week before the rally, I updated my TimeDrivenOdo software with a fresh set of bugs and additional user-interface shortcomings. When conditions were right, it let me give Steve time-error feedback around eight times a mile. When conditions weren’t right, it let me give Steve urgent gibberish at fifty phonemes a minute. A less patient and forgiving driver’d have stopped to thrash me with sagebrush boughs.

I’m left with a fresh appreciation for the work of a competent co-driver, and greater respect for Equipped teams. It takes a lot of effort to translate calcs into time error, and then more effort to communicate the info with the driver.

No Alibi flaunted the deserted, challenging, and scenic roads of the Palouse, with a nifty ratio of TSD to TRN in its 500+ miles. Three spots in particular wowed me:

Late Saturday, in the middle of Section #8
Know what happens if the co-driver directs a stop at the end of a FREE ZONE where there’s no extra time?
You begin the CATCH UP.
While I sat stupidly bewildered because the time for our departure wasn’t in the future, car #2 pulled up behind us. Good thing my driver’s run course opening car for the Wild West performance rally; he knew Tatman Mountain Road well.

First thing Sunday morning, down The Spiral Highway
Have you seen this thing?
Spiral H.
Sheldon Coles, car #29, was watching from the viewpoint above, and could see eight cars on-route at once, like a performance of synchronized swimming. The rallymaster picked a CAST that was too slow for the straights and too fast for the many, many, many curves — a perfect CAST, in other words.

Sunday afternoon, somewhere south of I-90
The sequence of instructions went something like this:

121 CAST 46
122 PB (paddleboard, a type of sign)
123 ACUTE LEFT at YIELD
. . . R at hairpin

Oh- wait; that last one wasn’t given. Rather, as you made the acute left, you could see the problem.

There’s a checkpoint car ahead on the right.
+ We’re essentially stopped
+ The CAST’s pretty high
=================
= ??

It would seem a simple dragstrip run could solve this equation. But loose gravel put another twist in — even cars with enough power on tap couldn’t put it to the ground. And… remember the hairpin right? Just as you passed the timing line, with your driver still set on MAX_ACCEL, it became necessary to move to MAX_DECEL to set up for the right. I heard plenty of tales from other teams a’ rounding that corner, tales filled with drama and verve. In our car, Steve had the iX pivoting like a dancer, and we were merely late.

Everybody was late. Or, more accurately, “later”.

Some teams were running so early before this control that they were still early at the end of the dragstrip. To find out who lost the least time, I looked at the delta between the crews’ lateness-or-earliness at the previous control versus their lateness-or-earliness at this one. In this sweepstakes, there was a four-way tie for second place between cars 4, 5, 10, and 21. Pretty good performance by all those teams.

But the winners on that short chute were racecar driver Tom Kreger and up-and-coming Unlimited navigator Cynthia Bushell, who managed to drop only two seconds. This bit of virtuoso driving, combined with their third-best-overall score for Sunday, hints that the UNL class won’t be getting easier any time soon.

Maybe I’ll stay in Equipped. Oh, Steeeeve…

No Alibi Measures Up

16
May
2011

The No Alibi Rally is June 4-5 and it is looking mighty good.

Last weekend Marvin and I measured the route, which begins and ends in Moses Lake and overnights in Lewiston. Our cunning plan was to leave on Friday at noon for the start at Moses Lake, run the event as far as Dayton, spend the night there and then measure the rest of the route on Saturday and be home that night in order to not completely use up the weekend.

Things were going great all day Friday, a timely departure, working hard, and placing checkpoints with the usual No Alibi flair. We stopped in Waitsburg at the Whoopemup Hollow Cafe for a most excellent meal. The Jambalaya was amazing and the locally brewed IPA wasn’t at all bad. Recommended.

Then we made our way to Dayton where things went a slightly askew. I won’t say much about the Dayton Motel other than if you find yourself in that part of the world searching for somewhere to spend the night, it is really worth your time to press on to Lewiston/Clarkston or some other place. Along with the shabby motel room it rained all night long.

Saturday morning had us at the Home Baked Goodness restaurant for a delightful morning repast. Also recommended, though probably not speedy enough to handle the No Alibi crowd when they come through town during the rally.

Marking CPs and noting GPS coordinates makes for a not-so-fast journey along the rally route, forcing us to enjoy the view, albeit a bit muted with the gray skies. As we traveled into the Marengo wind facility, we were able to traverse a section that had been blocked by a snowbank just a few weeks prior. It’s onone of my favorite roads but alas, the lack of gravel on the road surface had us slipping and sliding and getting concerned about measurement accuracy. Then we came to an uphill section, and despite a limited slip differential and gravel tires, there was just no way we could proceed through the rest of the regularity and had to turn around, with Marvin providing a boost to the front of the car to get us turned around. It was VERY slippery stuff; I’ve been on ice with more traction than that mud.
Marengo Mud
Fortunately we were able to map out and measure a new section to bypass the unusable road. We proceeded to Clarkston where we evaluated a possible venue for the Saturday dinner and then decided to go with the hotel as a banquet facility. With the re-route and running around Lewiston to find a place to print out more of the route we were behind schedule and knew we’d be finishing the long day in darkness.

After getting back to Ritzville and Moses Lake, setting checkpoint stakes by flashlight, we were able to change back to street tires and proceeded home over the pass. The I-90 transit home is usually not my favorite drive due to the inordinate amount of crappy drivers and left lane bandits that appear in the Ellensburg vicinity, but midnight on a Saturday makes for a much quieter drive. Our cold May trip was punctuated with light snow over Snoqualmie pass — let’s hope for better weather in early June!

Cross-brand Parts

20
Feb
2011

On the Thunderbird Rally last week we were taken out of the running by a broken clutch reservoir fitting on the clutch master cylinder. A pretty clever (at least I think so) emergency repair was made at the lunch stop using a spare brake line and a clamp. Now arriving home I’ve been trying to locate a replacement fitting for this 1983 Audi ur quattro and having absolutely no luck. It isn’t available separately.

In the photo the white part is the failed Audi part. The black part is a replacement. The replacement is identical in every dimension but has a slightly larger barb on the cylinder side, is reinforced at the bend, and is made of harder plastic. Source of the replacement? It’s a BMW E30 part from a 1990 BMW 325iX and I happened to have one on the parts car in my driveway. It’s also available online for about $8.

I may be silly but I think that’s totally cool.