rjensen92

I build everything and ride everything. I built several recumbent bikes, 1 titanium but dirt is where it's at. Also Iowa is flat...

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rjensen92 mikekazimer's article
Sep 19, 2016 at 15:42
Sep 19, 2016
Brake Power Meter Prototype - Interbike 2016
Perfect! Now I can accurately assess my burrito to hot air conversion efficiency!
rjensen92 vernonfelton's article
Aug 25, 2016 at 16:03
Aug 25, 2016
Dear Bike Industry - Opinion
@anchoricex: This ^^^ I'm so stoked I can get barely 6 mo old brand new components for 3 yr old prices on swap pages all the time! I don't even have to try! Admittedly I build my own frames and forks so I don't give too much mind to any standard, other than freehubs and crank spacing.
rjensen92 RichardCunningham's article
Apr 16, 2016 at 10:56
Apr 16, 2016
Felt's Supercharged Decree LE - Sea Otter 2016
@Uberbob102000: I'm a mechanical engineer, who focused in composites. I took classes with Boeing structural engineers also learning about composites (yikes?). I'd be 100% OK with having flex stays, especially if they are composite. Metals have a fatigue life where they will eventually break. (yes even steel loaded below the endurance limit will most likely fracture). Composites on the other hand that are made with a void % below a certain level have no measurable fatigue life. Additionally you can design a composite to be stiffer in one direction than another. I'd take a flex stay any day over a pivot. One less thing to break and it's a much laterally stiffer joint. TLDR: Composites are superior to metal in flexural fatigue, and vastly superior to a pivot joint.
rjensen92 mtbmaniatv's article
Jul 25, 2015 at 17:11
Jul 25, 2015
rjensen92 trek's article
Jun 21, 2015 at 16:48
Jun 21, 2015
Demo a Trek: Ride Before You Buy - Landahl Mountain Bike Park
Don't tell everyone about this trail! Grew up riding this midwest wonder! Watch for rain if your not from around here we have lots of clay in the soil so respect it when it needs to heal! Peace!
rjensen92 marymoncorge's article
Nov 13, 2014 at 18:29
Nov 13, 2014
RRP Enduroguard - Review
well milk jug is polyethylene but who cares....
rjensen92 marymoncorge's article
Nov 13, 2014 at 18:27
Nov 13, 2014
RRP Enduroguard - Review
This is a colored milk jug cut out. Just thought y'all should know you already have one in your refrigerator, you just have to drink it's contents then use a pair of scissors. Polypropylene is milk jug material. Talk about hipster, this is up-cycling at it's finest. Endurupcycling anyone??
rjensen92 RidingSpirit's article
Mar 29, 2013 at 22:52
Mar 29, 2013
Video: Ridingspirit - Defying Gravity
That RC Heli probably costs between 3-7 grand without the camera so... but you could get a small one and put a go pro on it with "similar" results.
rjensen92 mikekazimer's article
Mar 23, 2013 at 0:04
Mar 23, 2013
First Look: Prototype Novatec Factor Carbon Rim - Taipei Show
Technically it is, but you have to friction stir weld it, it's gets really cool because you can stir in things like ti as well, I think they should use it in the bike industry. I did research on making 7075 machined hollow cranks and joining it with friction stir but it didn't work really well at the 90 deg angle; luckily what they are doing is easy and is a very typical application (mechanically and geometrically speaking) and you can do it all day. Most of your chassis welds on new cars today are friction stir because then they don't have to heat treat and they can just stick one on the end of a six axis arm and have it do it easily on the line. deeeight, it can be a proprietary alloy, it just means it just doesn't fit into an ANSI standard.
rjensen92 rjensen92's video
May 27, 2010 at 13:27
May 27, 2010
video
Why are you so attacking? lets not be a$$ holes here... really

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