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Hopkins Baja Design / Build Thread
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RonGeorge View Drop Down
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Joined: 2010-Apr-17
Location: Rochester NY
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Posts: 93 		Post Options Post Options   Quote RonGeorge Quote  Post ReplyReply Direct Link To This Post Topic: Hopkins Baja Design / Build Thread
    Posted: 2010-Jun-07 at 12:47pm
Well that's perhaps because :

1) Polyester velcro can be used for only 2000-3000 cycles of opening and closing.
2) Nylon velcro, unless treated, gets degraded under sunlight over time and its strength may diminish because oxygen radicals weaken the polymer chain within.
3) It can become softer, flexible and weaker with water absorption.  This is part of the reason why toothbrush bristles are cleverly made of nylon so it doesn't score your teeth.



Edited by RonGeorge - 2010-Jun-07 at 12:48pm
Ron
Monroe Community College

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p.lewis View Drop Down
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Posts: 64 		Post Options Post Options   Quote p.lewis Quote  Post ReplyReply Direct Link To This Post Posted: 2010-Jun-07 at 2:25pm
I think the Velcro has two real reasons why it's not sound in this application:
 
1) it can clog with mud during an event and never refasten correctly until cleaned (people with Velcro'd-on headrests definitely have had this problem in the past... I think this is the problem that created the no-Velcro part of the headrest rule) -- here: http://forums.bajasae.net/forum/forum_posts.asp?TID=37&PID=2451&title=the-insert-your-school-here-rules#2451
2) people kicked Vecro'd body panels off of their cars during the 5sec egress test (discussed here: http://forums.bajasae.net/forum/forum_posts.asp?TID=37&PID=209&title=the-insert-your-school-here-rules#209)
 
What about the similar Self-Lock Mushroom-Head stuff? That doesn't seem as vulnerable to mud as the hook and loop Velcro. I have that stuff on my EZ-Pass transponder and I think it is a great fastener. http://www.mcmaster.com/#hook-and-loop/=7fjxun 
 
The zip tie half of the rules might just be a personal bias. I don't know where that rule could have come from. Notice that during dynamic days the zip ties get brought out and used liberally where they might not otherwise be allowed.
 
edit: added links to "the <insert your school> here rules" thread


Edited by p.lewis - 2010-Jun-08 at 12:45pm
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jhu42 View Drop Down
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Posts: 128 		Post Options Post Options   Quote jhu42 Quote  Post ReplyReply Direct Link To This Post Posted: 2010-Jun-08 at 1:13pm
Originally posted by RonGeorge

Adam,

Really interested to know how much power coating increased your frame weight by. Thanks.
We had it measured out to the gram but I cant find the numbers :(  . It adds ~ 5-7 lbs
 
Adam Baumgartner
Fmr. Hopkins Baja Team Captain- ('08-'10)

http://www.jhu.edu/asme/baja.html

Honda Design Engineer
Underbody Design
Honda R&D Americas

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