REFLECTOR: Titanium Firewall

Tue May 15 10:30:03 CDT 2007

Alex,

The thermal conductivity is dependent upon the alloy.... lower #'s are better.  CP Ti is 17, while 300 series (ie. 316) SS (Austenitic) is 13, NOTE that 6AL-4V alloy is 7.5

http://www.kobelco.co.jp/english/titan/characteristic/index.html

I would guess that shipping a sheet of SS and Ti to be about the same, given that - I paid $90 more for my Ti vs. SS firewall.  I was told that Tigermetals would have been a better price - I had already ordered mine - so I do not know.  I used the batting material supplied by Velocity behind the Ti - fiberfrax I think.  Given this - one has to decide for themselves how much $ is some weight loss worth...

I think it is as easy to work as the SS for this application - and it doesn't workharden.

John

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From: reflector-bounces at tvbf.org on behalf of Alex Balic
Sent: Tue 5/15/2007 10:06 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Titanium Firewall

My bad- I know the temp of stainless off hand, but had to look up the Ti - Google took me to an British site, and I guess they just assume you know that they are talking Celsius- One thing about Ti is that is pretty abrasion resistant as well, and probably easier to drill than SS- still it is pretty pricy- I made my firewall from stainless sheet from wicks- can't remember exactly, but I believe it was about $125 or so, I had to buy some Ti sheet- fro a heat exchanger project  got a thin piece "cheap" from eBay- only about 3"x 8" cost me 25 bucks, and I know that the thermal conductivity is strangely high- that entire sheet got hot within seconds when I Tig'd it a couple of months ago- as long as you have some insulation behind it should not pose a big problem though I would guess- I used some ceramic fiber batting behind my firewall- can't remember the R-value, but it was fairly high.

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of John Tvedte
Sent: Tuesday, May 15, 2007 9:38 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Titanium Firewall

Alex,

Perhaps you mixed units...?

Melting point of Ti (affected by specific alloy) - is approx. 1668C - 3034F - so 400+F higher than SS.

Density of Ti - is approx. .16 lb/cu in vs. .285 for SS (316 alloy) - approx. 56% lighter than SS.

BTW - when I ordered my engine install kit - I asked Velocity if they would sell it without the SS - sure not a problem - they took the $ off the price of the kit too.

John

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From: reflector-bounces at tvbf.org on behalf of Alex Balic
Sent: Tue 5/15/2007 9:18 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Titanium Firewall

I am not sure what the advantage would be unless you already happen to have
a big sheet lying around (free) - weight savings would be minor, and the
Titanium will melt about 1000 degrees sooner than the stainless (1600f vs
2600f) in addition, the thermal conductivity of Ti is higher than stainless
as well- not to mention that it is extremely expensive. I suppose the big
plus would be the hanger-talk factor.

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