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WRCDH Starlingcycles's article
Mar 4, 2024 at 15:56
7 hours
Video: Joe Varndell On Being A Student at MTB University
@pmhobson: I think he’s talking about when people hit a big jump too fast, catch way too much air, and piss themselves in the air and it runs down onto their fork, thus dampening the fork.
WRCDH Starlingcycles's article
Mar 3, 2024 at 4:47
2 days
Video: Joe Varndell On Being A Student at MTB University
3 years at MTB University, I’d come out as a PhD. Pretty Heavy Drinker, that is =P
WRCDH mattbeer's article
Feb 29, 2024 at 0:49
Feb 29, 2024
Frameworks' Bonded Alloy Prototype Made by Faction Bike Studio
“Frank The J-B Welder” is his new DBA.
WRCDH mattbeer's article
Feb 28, 2024 at 23:42
Feb 28, 2024
Frameworks' Bonded Alloy Prototype Made by Faction Bike Studio
Look...it’s Goldfinger! No wait, it’s just Niko & that messy golden-hue Loctite epoxy...
WRCDH PrivateerBikes's article
Feb 28, 2024 at 1:24
Feb 28, 2024
Video: Harry Barrett Shreds the Gen 2 Privateer 141
Unfortunately, I can’t unsee that “whiff of $hitting Dog” image of the Privateer Gen 2...even that second squatted-down riding pic above has that same whiff!
WRCDH edspratt's article
Feb 26, 2024 at 4:23
Feb 26, 2024
Industry Digest: 30% Drop in Shimano Annual Bike Sales, Apple Vision Pro Shopping Apps, Brake Lever Lawsuits & More
Meanwhile, Cannondale quietly ceases spec’ing V-brakes on their Scalpel model.
WRCDH edspratt's article
Feb 23, 2024 at 20:23
Feb 23, 2024
Final Randoms - Core Bike 2024
@Tambo: Haha, yeah...but Mk2 Jettas and Golfs had a certain charm through their imperfection though, huh?! But yes, they often left a lot to be desired =P =) Nice work on the VR6 swap! What color and what mods did you do? Not sure I’ve seen a Mk2 VR6 Jetta swap — rad! Here’s my old VR6 1977 GTI...I hope to buy it back later this year or next, after the current owner is willing to part with it...it’s the most enjoyable car I’ve ever driven. It was utterly dialed in every way, and sounded amazing with the Schrick 268 cams. And yeah, Nichole LOVED “The Thunderbunny” almost as much as I did =). My other gal friend, Carolyn, went out and bought a Mk3 VR6 Jetta the same week she first rode in The Thunderbunny...she was in love with The Thunderbunny and VR6’s, haha. Some pics: https://www.pinkbike.com/photo/26270738/ https://www.pinkbike.com/photo/26270739/ https://www.pinkbike.com/photo/26270740/ https://www.pinkbike.com/photo/26270744/ https://www.pinkbike.com/photo/26270741/ https://www.pinkbike.com/photo/26270742/ https://www.pinkbike.com/photo/26270745/ https://www.pinkbike.com/photo/26270746/ https://www.pinkbike.com/photo/26270747/ The VR6 1977 GTI specs from my sale ad: https://www.pinkbike.com/photo/26270753/ https://www.pinkbike.com/photo/26270749/ https://www.pinkbike.com/photo/26270750/ https://www.pinkbike.com/photo/26270752/ https://www.pinkbike.com/photo/26270754/ A few of my old R32 GT-R with Nismo R34 crate engine (for your viewing pleasure!): https://www.pinkbike.com/photo/26270755/ https://www.pinkbike.com/photo/26270767/ https://www.pinkbike.com/photo/26270756/ And a few of my current Honda DC5 Type R. I really want to build a Right Hand Drive 1976-1978 Rabbit GTI with a Honda 220hp K20A engine like the engine in my blue Type R: https://www.pinkbike.com/photo/26270765/ https://www.pinkbike.com/photo/26270763/ https://www.pinkbike.com/photo/26270766/
WRCDH sarahmoore's article
Feb 23, 2024 at 15:53
Feb 23, 2024
Peter Sagan Undergoes Surgery After Heart Arrhythmia During MTB Race
Interesting...I wonder if they did a neuro-immune work-up and IgE antibody blood count. Cardiac events like acute-onset tachycardia can often be induced by the abrupt release of tree pollen this time of year (usually cedar or deciduous trees). The pollen binds with the IgE (allergic) antibodies on mast cells and other immune cells, and an immune signaling chemical cascade ensues — histamine, cytokines, and commensurate neuro-immune response. The histamine has a pronounced vasoconstriction / vasopermeability effect which can have numerous microvascular / neuro-immunological / cardiac / immunological effects. The cytokines and cytokine cascade can have similar acute and latent effects...including some unique latent epinephrine (adrenaline) / norepinephrine (noradrenaline) autonomic nervous system effects on the heart (usually caused by the sympathetic effects of those neuro-immune chemicals / hormones, which is usually constrictive in nature — from the systemic microvascular effects as well as the muscle-contraction effects of adrenaline and noradrenaline)...and tachycardia, higher blood pressure, and muscular (including heart muscle) effects can ensue. In fact, my father had tachycardia one year ago (almost to the day, in late February) at the gym, just after an intense treadmill run on a high-pollen day, and the tachycardia hit 90 seconds after he finished the run during the typical sympathetic-to-parasympathetic transition of the autonomic nervous system — that day was our highest-tree-pollen-count day of the entire year (as I monitor the certified pollen particle counts in Seattle, daily). So anyhow, if I was caring for Sagan, I’d be keen to get his IgE (and also IgG) antibody counts, to see if any of them correlate to that day’s pollen-subtype counts. This sort of cardiac / tachycardia event, for some people, can be most pronounced early in the pollen season when a high-pollen-count day hits — just as the immune / neuro-immune system is ramping up its hyperactivity in response to allergens...just when mast cell granules, basophil granules, and other immune cells and neuro-immune responses are ready for a full-throttle maximum degranulation / immune-chemical-signaling reaction to an allergen / antigen. A blast of a lot of pollen, combined with extensive ingestion and pollen antigens during a race or exercise (if sensitive to them), combined with the unique neuro-immune response in high-level sports efforts, can sometimes induce tachycardia and other cardiac events. I had a similar reaction at one point, but it was actually an allergy + epinephrine (adrenaline) episode from mountain biking that resulted in extreme chest pain right at / over my heart. Turns out it was intercostal rib muscle cramping — a unique response to allergens, some summer wildfire smoke, adrenaline, and extreme cycling exertion earlier in the day (and the latent neuro-immune and autonomic nervous system effects from that relatively extreme exertion). But before they figured that out, they had me do a cardiac stress test on a treadmill. They told me to go as hard as I could, until I couldn’t go anymore — I was like “Are you sure? Are you ready for me to go all-out?” And they sort of laughed like “yeah, we do this all the time”. Well, apparently they do it for lots of out-of-shape people, because I was 41 then, and as I hit 200bpm they started to look at each other and talk some, also asking me if I was sure I was okay. I nodded and kept going. About a minute later I was at 203bpm, hoping to hit my all-time max from age 18 (when I had turned pro in downhill and was in great shape) of 206bpm. When they realized I wasn’t hitting the typical lactic acid wall-of-pain, they worriedly conversed for a moment and then abruptly halted the test, realizing that I was actually going to go until I couldn’t anymore (either falling down, or heart attack). They all seemed relieved when I didn’t have a heart attack and die, but we were all sort of excited I passed with flying colors. A week or two later, they figured out it was intercostal muscle cramping (partially from post-cycling bike-handlebar torquing when riding hard at near-max exertion for about 2 hours). Anyhow, be aware (even if you don’t know if you have allergies) that high pollen count, as well as wildfire smoke, can cause some very strange and alarming cardiac / neuro-immune / autonomic nervous system / vascular effects. Doctors probably won’t pick up on this unless you mention it as a possibility in terms of the symptoms / conditions / variables. I’m not a doctor (just an engineer / biomedical-engineer) so this isn’t any sort of official medical advice, but I hope it might help someone during their care...with their doctor’s guidance & medical-team’s guidance =)
WRCDH edspratt's article
Feb 23, 2024 at 6:09
Feb 23, 2024
Final Randoms - Core Bike 2024
@Compositepro: Oh, we did a lot of the engineering, R&D, and prototyping work in Seattle, and some at our facility in Andover UK, but I went to the McLaren Technology Centre in Woking a lot — all from 2005-2010. Then I did some additional McLaren Applied Technologies projects for several years. As for the carbon tub, we backed out of producing the tub/chassis for McLaren and Carbotech in Austria took over when we didn’t want to take on the financial risk associated with McLaren’s quite-optimistic sales projections. Apparently Carbotech was almost sunk because of that issue (specifically, the lower cash flow from lower volumes in the first years made it difficult to recoup their investment and difficult to cover high overheard costs associated with the program). That’s one reason why McLaren moved production in-house to their new(ish) custom-built Sheffield facility a few years ago. The “patented” 4-hour “single piece” manufacturing was my contribution =). It’s actually a lot more than 4 hours — it’s just a 4-hour mold utilization cycle...with dozens of hours of other labor prior to, and after, that 4-hour mold cycle time. The crazy thing is, I was supposed to be a summer manufacturing intern on the McLaren SLR in 2005 — it took about 9 months to arrange the internship with McLaren, being from the US. But then I broke my back snowboarding and had a spinal cord injury, a few months before the internship was due to start. I called McLaren’s HR manager from the hospital and she told me I was SOL — the internship wouldn’t happen due to my required recovery time. I was crushed. I didn’t know what to do if think, nor did I know if I was going to be able to walk, so I simply prayed for an opportunity to work with McLaren in the future. Amazingly, that put me at peace about it. A few days later my friend Nichole visited me in the hospital...super cool and smart gal who loved cars and had a rad VR6 GTI. We got to be better friends during my recovery, and one day a few months later she told me her dad does aerospace composites, kind of like the automotive composites I was keen on, and that I should meet him. When I met him, he offered me a tour of their Seattle aerospace composites facility. A few weeks later the tour day was approaching and his engineering manager called me and told me to bring my resumé. I was stunned — my medical insurance had changed and I was going to no longer be receiving medical coverage in a few months, and at the time I wouldn’t be able to get new independent medical insurance due to my “preexisting” spinal cord injury (a rule which changed with Obamacare). But the tour went well, they liked my resumé, and they hired me a few weeks later — and I got full medical coverage, despite my “preexisting” (and expensive) SCI. But 8 weeks after starting at that aerospace company, the sales manager called me to his office to discuss new market opportunities like nanocellular foams + composite skins, and single-crystal sapphire bulletproof armor windows with bulletproof composite doors for military vehicles. But when I was waiting outside his office, I heard him on a phone call discussing “McLaren.” I was mystified. When the call ended, he called me into his office and I asked about “McLaren.” He said “Oh no, you don’t know these people, they’re in England.” And I said, “No, I do know them, I was supposed to be working there as a college intern right now!” He was just as surprised as I was. Turns out McLaren had come knocking on our door (well, through the phone), as our company’s UK site made the carbon fiber fabrics and flat-pack CNC-knife-cut carbon fiber preform kits for the McLaren SLR program. McLaren wanted us to bid on their new car program...the program for engineering and prototyping and manufacturing the carbon tub for their next vehicle (just like is used on all McLarens today!). It was a 5-year R&D + Prototyping program, and then a $250,000,000 multi-year manufacturing contract =o ! We were all amazed by the situation — they had hired me to help them get into new markets, but they didn’t expect a perfect fit like this! Two weeks after that, I was at McLaren Technology Centre bear London giving a sales / technical / business proposal presentation with our team, to the senior engineering & business leadership of McLaren — and after talking all lunch with their otherwise-reportedly-mute engineering director (where we accidentally invented McLaren’s hydraulically-controlled suspension-roll-control-system based on my similar Formula SAE system), we ended up being awarded the R&D contract! I couldn’t believe it. The next day, we went to the McLaren SLR production facility in Portsmouth. While there, the manufacturing engineer who was supposed to be my internship mentor told me that the HR manager, Lynne, was in the office. We both realized we had to go talk to her, as just a few months earlier, she had to end my internship...all while I laid in the hospital, unable to walk. I walked in, Graham was smiling, and I introduced myself and Lynne had a look on her face like: “I told you no months ago, and I’m not changing my mind, I don’t care how far you flew to talk to me.” But then I told her that McLaren came knocking on our door in Seattle and that I was going to be the lead R&D engineer on manufacturing their next new McLaren carbon fiber vehicle structure. She couldn’t get her head around it. It made no sense to hear. Graham was just laughing at the stupefied, perplexed, almost-alarmed look on her face. She asked how this could have possibly happened. I told her I didn’t know, other than that I had prayed for an opportunity to work with McLaren, moments after I had last talked to her, when the internship fell through. None of us had ever experienced anything like that before, so we all just talked through it a bit...it was a fun conversation =). But she was just amazed that I was supposed to be a lowly production intern, making SLR’s all day for minimal pay, and now I was in charge of development their next carbon fiber car structure that would replace their SLR and replace their Portsmouth facility. It still doesn’t make sense to me today, aside from a direct answer to prayer in a crazy semi-miraculous way...including learning to walk again just months before! But yeah, I’m still waiting on that McLaren 720S in British Racing Green prayer =P
WRCDH edspratt's article
Feb 23, 2024 at 4:59
Feb 23, 2024
Final Randoms - Core Bike 2024
@pbuser2299: Ah, Coefficient of Thermal Expansion =). Sometimes you can get high residual strain at interfaces between carbon fiber cranks arms and aluminum inserts, because the aluminum expands so much more than the carbon during the curing process. Composite inserts minimize that CTE mismatch.
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