Montbell Tachyon Anorak CFM

Richard Nisley's Testing (Posted2014)

I have not tested a Montbell Tachyon but, I have tested the SAME APPARENT Montbell 7 denier ballistic rip stop used in their EX Light. It tested 9.72 CFM.

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=77522&skip_to_post=662583#662583

Just what I was looking for, thanks Ken.

Is the MEC RD discontinued? I can't find it on the web.

Something is wrong there with the BD Alpine Start stats.

Ken, can you provide a link to where you pulled that info?

Maybe Richard will see this thread and comment?

DISCONTINUED

Thank you Link :)

I'd like to see the thread that the chart came from. HH of 2000? Is the Tachyon waterproof? Any real-world experience to confirm this?

How can the tachyon have a HH that is 4 times higher than the houdini but still be 3 times more breathable? That doesn't make any sense.

I would like more info as well, as I had read that a hh of 2000 was considered waterproof. Perhaps I am misinformed and it is 20000?

2000 is practically waterproof for a cover garment. The Packa lists theirs at 1200 mm.

On the other hand, 2000 is too low for something like a tent floor….

I doubt the MB Tachyon is actually rated @ 2000, and wonder where that figure came from.

I'm sure it's a typo or something. I own a Tachyon and can assure you it's closer to 200mm.

Ryan

My Tachyon wetted out in under a minute, during an at home test, but it wasn't just a sprinkle test.

John Abela just answered your question today:

http://hikelighter.com/2015/02/18/wind-jackets-montbell-tachyon-patagonia-houdini-zpacks-wind-shell/

"“Patagonia Houdini” == the best option for breathability, yet some airflow getting through, which could result in a body cool down due to super cold wind penetration."

I guess talking pre-2013 Houdini here?

Ryan

.

.

Would anyone happen to know how the Ghost Whisperer fabrics CFM compares with the Tachyon's? Both are a 7d fabric I believe.

I read somewhere via Richard that the GW CFM would be below 10 because the fabric is the same that is used on MH's down garments whereby the fabric must have a CFM of <10 to be considered downproof. The CFM of the MB is just under 10.

But direct comparison – not sure apart from saying that both are <10.

I've owned a MH Ghost Whisperer and it is essentially the same as the Zpacks wind shirt. Very low breathability. A good bit less than the Tachyon. Based on the very scientific Vader test.

Ryan

I meant to come back and edit my post but completely forgot. Changing up my keywords in the search box provided me with some good answers.

I'm planning on using the Tachyon heavily as my trail running wind shirt and it looks like the breathability is exactly what I'm looking for. I don't mean to derail the thread too much but how effective is the Polkatex DWR of the Tachyon?

Also, on Montbell's website it states that the Polkatex DWR is a water based fluorine chemical, just wondering if there are any concerns about the toxicity of this as I have heard concerns for fluorocarbons or PFC's in general. Are these concerns legit or are they completely negligible in the real world usage of this layer?

Hi Jordan,

While I can't comment on the HH of polkatex, hopefully someone on here can. It would be great to have a precise figure.