If anyone has any extra helmet fans and wants to get rid of them I'll take them off of your hands. I'm looking for the full kits (fan, on/off button, and battery attachment). If not I'll go through ebay for these. Just checking here first.
Discussion on Helmet fans within the The Cargo Hold forum, part of the For Sale category; If anyone has any extra helmet fans and wants to
If anyone has any extra helmet fans and wants to get rid of them I'll take them off of your hands. I'm looking for the full kits (fan, on/off button, and battery attachment). If not I'll go through ebay for these. Just checking here first.
just remember, not all fans are created equal
I just spent a couple of days researching which fans to put in my new bucket...
for just a few dollars more, you can find fans online that will push double, or even triple the airflow of standard off the shelf cooling fans, and use fractions of the power to do it (ie much longer battery life)
please enlighten us with links of the those mystical fans
haha serious. I want strong fans that use less energy.
http://www.coolerguys.com/fans.html
this is a pretty decent place to buy quality fans.
there is a fan in there that is only 25mm or 1 inch square that pushes 3.5CFM at only 5vdc, at under 1 watt.
for comparison, the old 50mm 2 inch fans i picked up for my trooper bucket last year, only pushed 2.9cfm
the radio shack mini fans are 40mm (1.57inch), burn 1.56watts, and still only push 3.5cfm
there are even sunon 30mm fans that will push up to 6cfm.
like i said, not all fans are created equal
Last edited by Anomaly; 08-14-2009 at 04:49 PM.
Even though it's a 5vdc fan, can you hook a 9v battery to it without damaging the fan? Can you believe I did my first two years of college in Electrical Engineering?
A. B.,
I have to do a birthday party in my TK today, and I've got one 5v fan hooked up to a 9v battery, and another 5v fan hooked up to 4 AAA which is 6 volts. It could damage the fan over time, I'm hoping an hour today won't bother it.
Normally my system is 4AAA making 6v, running 2 5v fans parallel. They just don't push enough air on hot days.
I'm looking into a system for my TK that is 4 blower fans, and many AA battery boxes supplying 12v to 2 fans each.
I'm in the process of redoing the fan system, and what I've learned is AA batteries are the way to go, even AAA are better than 9 volt. The 9v have a much shorter life which is the milliamp hour rating. I forget the specifics ( and I'm no engineer, but I did stay at a Holiday In Express last night ! : )
Anything much over 24 dB will be on the loud side.
Bearingless (no bearings ) fans are more efficient and quieter.
Squirrel cage (blower) fans push more air and they can be DIRECTED, the flat CPU fans are limited in where they can be effectively placed. Blower fans would be better in a Mando bucket I think.
You want to have something bringing air in, and something blowing it out. This will aid in fogging prevention, it will bring fresh breathable air in, as well as expel CO2, and this flow is what will cool you.
I also picked up a hard had gel cooling pad to try out. The neck coolers work well, so I thought I'd try the head pad.
http://cgi.ebay.com/Star-Wars-stormt...ht_1930wt_1167
Fan link http://www.buyextras.com/dcbrblfa.html
whitearmor.net has a forum for electronics which is very helpful.
I don't even know if I answered your question all that well, but I thought I'd share what I've found,
Good luck !
Last edited by Timmer; 01-28-2010 at 05:44 PM.
your correct. the 9v isnt the best power source. and will likely damage a 5v fan.
voltage isnt always the answer with fans either.
if you look around, you will find that you can usually get a 5vdc fan that will perform exactly the same CFM as a 12vdc counterpart.
and the plus with that, is people usually hook a 9v to 12v fans, thereby decreasing their performance by a large margin.
whereas with a 5v fan, you can easily run 4Xaa or AAA, get 6vdc, getting higher performance, and the mAh out of those AAs will last ALOT longer than a 9v.
the trick with flat cooling fans, is where they draw air from.
I see so many people with them laying flat against the bucket. that will reduce the CFM of the fan by more than half.
if you want max airflow from the fan, it MUST have enough airflow to the intake side without making the fan draw any vacuum.
My plan is to purchase 4 small racheting hinges, mount my 4 fans around the bottom rim of my helmet. (probably 3 intake, 1 venting just below the chin)
that way they can be folded up against the wall of the bucket out of the way.
and folded down perpendicular with the helmet wall when in use.
thereby giving the fans full access to outside air to draw into the bucket.
Also one note with noise.
dB levels dont compound like one would think
2 25dB fans does not equal 50dB
not even 40dB
in fact you are far better off with 4 25dB fans....than 2 30dB fans.
Man I love you nerds!! You know everything that I know NOTHING about!!!
Posting Permissions
Reply With Quote