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CJohnston(at)popsound.com
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 Posted: Thu Oct 23, 2008 9:32 am Post subject: scat tube flange-reduction from 2" to 1" |
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Hey Tom -
I needed to reduce the heater tube diameter for my tunnel and I discovered that just reducing it from 2" to 1.5" gained me the necessary clearance for my application. If you discover that in fact 1.5" would be sufficient, take a look here:
http://www.siliconeintakes.com/
They have a pretty wide working temp range, and should work nicely for this application. For me, I got the 2" to 1.5" reducer, and used a piece of scrap tubing from the push pull controls (happily exactly 1.5" diameter) to connect the reducer. I also got one to re-largify back to 2" for the connection to the outlet at the pax feet. the 1.5" diameter tubing fits nicely between the spar and the tunnel cover. the only thing is that you should angle the aluminum T connector at the pax vent to point a bit forward, as the reducer pointed straight up would contact the tunnel cover. I also trimmed the reducer a bit to shorten it.
cj
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tomhanaway
Joined: 12 Aug 2006
Posts: 111
Location: Murphy, NC
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| Posted: Fri Oct 24, 2008 3:47 am Post subject: Re: scat tube flange-reduction from 2 |
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CJ,
Thanks for the site info. Actually, I'm using an extended Andair valve stem and don't have a clearance problem. I'm trying to keep the total hose volume down to lessen the heat effect.
One guy has contacted me with a reducer he can build. I'm going to try two of them. One at the firewall to reduce hose and a second at the rear passenger valve to bring fitting back to 2".
I've attached some pictures but will leave it up to him to post his name and # unless he tells me it's ok to do so.
Thanks again,
Tom Hanaway
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jesse(at)saintaviation.co
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| Posted: Fri Oct 24, 2008 6:33 am Post subject: scat tube flange-reduction from 2" to 1" |
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Am I missing something here? The valve on the firewall is what
controls how much air there is going through the scat tube. Putting
in a smaller tube can also affect that, but that just limits the
amount of air going into the cabin at a given valve setting, but
closing the valve can also have the same affect.
Tim (or anybody else), have you ever had either of your heat valves
all the way open? N256H has flown well below freezing a lot and has
never much more than cracked open the heater valves.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Oct 24, 2008, at 7:47 AM, tomhanaway wrote:
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Fri Oct 24, 2008 7:02 am Post subject: scat tube flange-reduction from 2" to 1" |
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I don't know that I've ever had my heat valve open all the way
other than maybe on the very coldest of flights or pre-takeoff
before the engine is warmed up. The flapper valve does the
job, just like you said. One thing that I do believe is that
it's nice to use the rear heat more than the front. It keeps
my feet from baking, gives a more even cabin heat, and heats
up those colder rear-seat passengers. So I'd rather have the
option to have rear heat blasting than front. Up front, what
I'd like, is a cold-air mix option, so you can get some cool
air in that same vent. But, I haven't found that to be a big
deal.
We've been well below freezing too....heck, in another couple
weeks we'll be in snow again. Lots of flights in the winter
end up significantly below zero at altitude.
Tim Olson - RV-10 N104CD - Flying
do not archive
Jesse Saint wrote:
| Quote: |
Am I missing something here? The valve on the firewall is what controls
how much air there is going through the scat tube. Putting in a smaller
tube can also affect that, but that just limits the amount of air going
into the cabin at a given valve setting, but closing the valve can also
have the same affect.
Tim (or anybody else), have you ever had either of your heat valves all
the way open? N256H has flown well below freezing a lot and has never
much more than cracked open the heater valves.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Oct 24, 2008, at 7:47 AM, tomhanaway wrote:
>
>
> CJ,
> Thanks for the site info. Actually, I'm using an extended Andair
> valve stem and don't have a clearance problem. I'm trying to keep the
> total hose volume down to lessen the heat effect.
>
> One guy has contacted me with a reducer he can build. I'm going to
> try two of them. One at the firewall to reduce hose and a second at
> the rear passenger valve to bring fitting back to 2".
>
> I've attached some pictures but will leave it up to him to post his
> name and # unless he tells me it's ok to do so.
>
> Thanks again,
> Tom Hanaway
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 10074#210074
>
>
> Attachments:
>
> http://forums.matronics.com//files/reducer_3_266.jpg
> http://forums.matronics.com//files/reducer_2_199.jpg
> http://forums.matronics.com//files/reducer_1_916.jpg
>
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cj(at)popstudios.com
Guest
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| Posted: Fri Oct 24, 2008 8:39 pm Post subject: scat tube flange-reduction from 2" to 1" |
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I'm not trying to control the amount of heat, just wanted everything
to fit better in the tunnel.
cj
On Oct 24, 2008, at 7:29 AM, Jesse Saint wrote:
| Quote: |
Am I missing something here? The valve on the firewall is what
controls how much air there is going through the scat tube.
Putting in a smaller tube can also affect that, but that just
limits the amount of air going into the cabin at a given valve
setting, but closing the valve can also have the same affect.
Tim (or anybody else), have you ever had either of your heat valves
all the way open? N256H has flown well below freezing a lot and
has never much more than cracked open the heater valves.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Oct 24, 2008, at 7:47 AM, tomhanaway wrote:
>
> <tomhanaway(at)comcast.net>
>
> CJ,
> Thanks for the site info. Actually, I'm using an extended Andair
> valve stem and don't have a clearance problem. I'm trying to keep
> the total hose volume down to lessen the heat effect.
>
> One guy has contacted me with a reducer he can build. I'm going
> to try two of them. One at the firewall to reduce hose and a
> second at the rear passenger valve to bring fitting back to 2".
>
> I've attached some pictures but will leave it up to him to post
> his name and # unless he tells me it's ok to do so.
>
> Thanks again,
> Tom Hanaway
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 10074#210074
>
>
> Attachments:
>
> http://forums.matronics.com//files/reducer_3_266.jpg
> http://forums.matronics.com//files/reducer_2_199.jpg
> http://forums.matronics.com//files/reducer_1_916.jpg
>
|
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tomhanaway
Joined: 12 Aug 2006
Posts: 111
Location: Murphy, NC
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| Posted: Sat Oct 25, 2008 3:52 am Post subject: Re: scat tube flange-reduction from 2 |
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I've run air conditioner lines within the tunnel. Reducing the size of the heater hose gives me more room, a cleaner install and avoids contact (and potential heat transfer) between the coolant hose and the heater hose.
Additionally, I'm exploring redoing the heat valve control cable so that it comes directly down the inside of the tunnel and may be controlled by a rotating dial located on top of tunnel aft of the fuel valve and a second control back in the passenger portion of the tunnel so that rear passengers can control their own heat. This will also require the smaller hose.
Tom
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greghale
Joined: 10 Jan 2007
Posts: 91
Location: Tulsa, Oklahoma
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| Posted: Sat Oct 25, 2008 6:33 am Post subject: Re: scat tube flange-reduction from 2 |
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Tim, I wanted to be able to mix the cold with hot air also. This is what I came up with. I also have details on my web site page.
http://www.nwacaptain.com/heatcool.html
Greg...
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_________________
Greg Hale rv10 -- N210KH
www.nwacaptain.com |
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