Peezy's Black Magic 2013

[Pearl]

after trying to read utahs number thingys

About 2 months ago our 3rd family asked if we wanted to head to another Devils game. At the time, the Devils were well into a playoff spot agains the Canadiens, who were 1st in the Eastern Conference. I figured it would be a great playoff preview.

Fast forward to Tuesday, and you would be wrong. We are going to a meaningless game for the Devils and it kind of sucks. Mandi thought we would just get refunded for the tickets, but that's not how it works. Before we went out, she did take back her Race the Train QOM against Mrs. Kevin L. Wish it was that easy for me!

Thankfully we had something to cheer about. During the intermission we noticed Ilya and Bard were here too. They were in the swanky seats. We are in the nosebleeds. But the nosebleeds are good in a sense. Lots of funny things happening. My favorite was some guy saying "excuse me sir" to a woman who I thought (and everyone else) thought was a dude.

Me smashing some popcorn after waiting in the wrong line. If I find myself jumping to another line, the original one will move faster.

Me taking the escalator, like a boss.

It always ends up being a long night, but it was a good night.

 

[ChrisG]

I got this JP. Some really bored mathematician did all of the hard work already. So all you have to do it convert some units and plug in the numbers.

So...

P (power)= ? in watts
g (gravity)=9.81m/s^2
m (mass)=74.84kg (147+18lbs)
Vg (ground speed) 11.75 m/s
Va (air speed) your missing wind speed and direction, so lets just assume is the same as ground speed.
S (grade)= 0 since in this case we will assume the road is flat.
K1 = .0053...someone somewhere stopped playing legend of zelda long enough to come up with a constant frictional losses (chain, tires, etc.) of a bicycle.
K2 is a constant for aerodynamic drag and its agreed to be .185 kg/m.

and so....9.8*74.84*11.75*(.0053) + .185*11.75^2*11.75

P=345W

I think I had to answer this question on the GRE.

And I probably got it wrong...

 

[SpartaBard]

It always ends up being a long night, but it was a good night.

yeah, it was a long night, but it was actually a fun game to watch.

 

[UtahJoe]

I think I had to answer this question on the GRE.

And I probably got it wrong...

Ya, I seem to remember screwing these up in college, although the ones I remember doing were often 10 times longer.....We need Mr. Christman to check my work.

 

[Glenlivet12]

Didnt get home until 11:45. Great game, tho. It was nice to see them come out with a win!

 

[Delish]

This is rad. It actually answers a question I've been thinking about lately: for two different people--we'll call them Mr. Small and Mr. Big. Assume Small weighs 135 lbs and Big weighs 180 lbs. What is the output required in terms of watts and watts/kg to maintain 25 mph speed on flat ground, zero headwind?

If we assume that aerodynamic drag is the same for Big and Small (probably not entirely true) then Small needs to put out 294W and Big needs to put out 306W. That's like 4% more power. BUT, in terms of power-to-weight it means 4.8w/kg for Small and only 3.75w/kg for Big. That's a BFD...like 28% more w/kg. Of course the whole calculus for w/kg flips when you start adding hills to the mix.

 

[1speed]

I thought the coefficient of drag (K2) was a unitless quantity that varies by shape (i.e., a tear-drop aero shape has less drag than a sphere) but it's described as a constant in terms of kg/m here. Am I not thinking of the right thing herer as K2?

 

[UtahJoe]

I thought the coefficient of drag (K2) was a unitless quantity that varies by shape (i.e., a tear-drop aero shape has less drag than a sphere) but it's described as a constant in terms of kg/m here. Am I not thinking of the right thing herer as K2?

I think its a typo in the formula description...seems to me it should be kg/m^2....would need to be some kind of a force/area component I would imagine.

But Eric makes a great point....much harder on him, pearl, iggy etc..to hold 25mph on a flat than it would be for norm and I. Norm and I are just lucky that we live in NJ and not colorado. 😀

 

[Santapez]

I have an excuse for my slowness! Backed by mathematics!

 

[Delish]

Yeah, it should probably have a frontal area component or to make the it more accurate.

 

[woody]

yup, there must be more to K2
gotta account for lycra vs baggies vs mumu

 

[1speed]

Rumor has it that Zipp considered gluing pubes to their carbon wheelsets instead of going with the Firecrest golf-ball pattern. It was a manufacturing nightmare, however.

The manufacuturing was less challenging than the raw material acquisition.

 

[Red Mosquito]

Can't forget about the leg hair

Sent from my Galaxy Nexus using Tapatalk 2

 

[gtluke]

isnt' there an argument that hair makes less drag? Like that little pocket created by your calf muscle is now smoothed over with fur!

 

[Delish]

you mean like shark skin?

 

[Santapez]

I think more like the hair creates a barrier layer providing more laminar flow above it.

Same theory behind a dirty car is more efficient than a clean car.

 

[Carson]

isnt' there an argument that hair makes less drag? Like that little pocket created by your calf muscle is now smoothed over with fur!

Rumor has it that Zipp considered gluing pubes to their carbon wheelsets instead of going with the Firecrest golf-ball pattern. It was a manufacturing nightmare, however.

 

[stb222]

isnt' there an argument that hair makes less drag? Like that little pocket created by your calf muscle is now smoothed over with fur!

I read an article on a way to shave your legs that is more aerodynamic by being like stubble on the front and smooth on the side. I think pearl should try it, for science sake.

 

[Pearl]

Wow, this has really taken a turn for the worse. I'm not sure where to start with this math stuff. I don't really have the time to figure this out, I hoped someone would have stepped up. I guess Utah's explanation is good enough for me.

So I took Jay up on his offer for his spot and his bike. Strategically planned picking that up and meeting Mandi at the Canal lot to let her rip. I've been really loving my decision of getting the Scalpel as my only mountain bike. I was worried I wasn't going to enjoy riding this bike. Lou saved the day by bringing extra pedals to replace Mandis rust buckets. Ran out of the shop and hit the Canal lot around 5.

Lou was meeting OG Madness at the 27 lot, so I knew we would run into them eventually and ride most of the loop with them.

We chat it up all the way until we run into the dudes on the 27 side somewhere. We turn around and we let Mandi lead, and she ends up dropping us 🙁

First time for Lou on the CX bike at Six Mile, I think he had a good time. Mandi has to jet because she's doing some wedding stuff, so we continue on the white/red/blue enjoying ourselves.

The handlebars became loose on Jays bike, so I stop to fix them. I think the fork needs a little more air in it too. Every time I was going to jump something it would bottom out.


http://connect.garmin.com/activity/302870535

I loved it. Felt good to ride one gear again. I appreciate the weight savings now. With a harder gear I think this thing will fly. Hope jdog still has some magic on this bike left over for me 😉

I was thinking "Man I could ride one of these again" then I look down and forget how dialed this freaking bike is. Somehow without adjusting anything, it fits me perfectly. No seat or reach adjustments, anything. I can't afford one like this.

I also ate way too much chinese food after our ride.

 

[Kirt]

Sport? Didn't u do ok in open last yr?

Nice bike though