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defrosters
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Sean Blair



Joined: 09 Jan 2006
Posts: 39
Location: Colorado Springs

PostPosted: Fri Feb 17, 2006 7:15 am    Post subject: defrosters Reply with quote

How about using a defrost fan from a car. This way you get on, off, and multiple speeds. Already 12 volts too.

Sean B
#40225
---- Jesse Saint <jesse(at)itecusa.org> wrote:
[quote] We have a cooling fan system from Aircraft Spruce that has three ports, two
going to the radio stack and one unused. That could easily be run to a hole
in the glare shield to be used as a defrost. In fact, a fan with more ports
could be used and have two or more defrost ports. It would be always on,
but I can't imagine that that would make much difference, since the fan is
always running anyway, and the air is just from under the glare shield, so
it shouldn't be too hot or cold except maybe just starting out. Any reason
that this shouldn't work?



Thanks.



Jesse Saint

I-TEC, Inc.

jesse(at)itecusa.org

www.itecusa.org

Fax: 815-377-3694



I am in Ecuador until May, 2006. If you have questions regarding I-TEC,
please call the office at 352-465-4545. If you would like to talk to me,
please call me at 352-505-1899. This number won't always be on, but it has
voicemail that will get to me in Ecuador.

_____

From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of RAS
Sent: Wednesday, February 15, 2006 11:12 AM
To: rv10-list(at)matronics.com
Subject: Re: defrosters



Hi,



I'm not to sure this set up will work on the ground without a fanmotor of
some description. You'll need quite a bit of forward motion to get air to
move through the entire system. In addition, the windscreen tends to steam
up when on the ground before and after engine start, ie, when you do not
have forward movement. It is even doubtful you'll have sufficient forward
motion during taxi.



The set up with the cooling fans out of a computer is a better option nad
it's not the first time I've heard about it.

I know there's RV4's and -6's flying with them.

---


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_________________
Sean S. Blair
#40225
N967SB (reserved)
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JSMcGrew(at)aol.com
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PostPosted: Sat Feb 18, 2006 8:51 am    Post subject: defrosters Reply with quote

I asked Van's about a defrost system. Ken Scott told me that they have computer fans mounted under the glareshield in the prototypes. I plan on doing the same. I'm going to try putting one fan in the tunnel as well to keep the temperature down in there.
 
Jim McGrew
40134


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PostPosted: Sat Feb 18, 2006 6:50 pm    Post subject: defrosters Reply with quote

Jim,
Sounds like reasonable idea to include a fan in the tunnel – how do you plan to duct the source and exit air?
 
Marcus
40286
 
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schmoboy(at)cox.net
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PostPosted: Sat Feb 18, 2006 8:21 pm    Post subject: defrosters Reply with quote

Why not just duct it up to the defrost exit? Accomplish two things with
one fan!

-Sean #40303

Marcus Cooper wrote:
[quote]
Jim,

Sounds like reasonable idea to include a fan in the tunnel – how do
you plan to duct the source and exit air?

Marcus

40286

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n8vim(at)arrl.net
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PostPosted: Sun Feb 19, 2006 5:25 am    Post subject: defrosters Reply with quote

I use the KISS principle; Just move air from the bottom of the
glareshield to the top by means of a fan Smile

For the heat in the tunnel, has anyone thought of just using a small
hole screened over (to keep bugs out) at the front and aft ends of the
tunnel? K.I.S.S

-Jim 40384

Marcus Cooper wrote:

[quote] Jim,

Sounds like reasonable idea to include a fan in the tunnel – how do
you plan to duct the source and exit air?

Marcus

40286

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coop85(at)bellsouth.net
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PostPosted: Sun Feb 19, 2006 6:03 am    Post subject: defrosters Reply with quote

Quote:
>>> For the heat in the tunnel, has anyone thought of just using a small
hole screened over (to keep bugs out) at the front and aft ends of the

tunnel? K.I.S.S
I'm all about the KISS principle, but I think just creating vents at the
front and back of the tunnel might create problems. There were similar
issues with my first airplane, a Q2, that had internal airflow problems
since the fuselage was sealed so well and everyone was trying to figure the
best place to put an air exit vent. My concern would be not knowing for
sure which side is going to get positive pressure, if so what kind of air
are you getting. Avoiding any sort of exhaust or heat from the engine
compartment would be important. Seems like Vic Syracuse' solution by
ducting some air to the area right in front of the tunnel forward of the
firewall seems to be working based on a recent message. Just philosophizing
since I haven't even hung my engine yet.

Marcus

-Jim 40384


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PostPosted: Sun Feb 19, 2006 6:38 am    Post subject: Defrosters Reply with quote

Actually, I'm working on this today. I am going to mount the computer fan in the tunnel cover forward of the fuel selector valve (directly over the boost pump and filter). It will be offset to the left to allow the rear cabin heat scat tube to go by. The fan will blow cool air down into the tunnel and should exit on its own to the cabin: there are enough openings at the front of the tunnel lid and out underneath the front seats to allow for adequate flow. I am going to try this to, hopefully, avoid taking out all the fuel lines to install insulation on the tunnel floor.
 
The defrost fan will be under the glareshield aft of the subpanel and left of the center rib. It will probably get enough heat from the radio stack and maybe even draw some air up from the heat vents that are directly underneath. There simply isn't enough room under my panel to easily run a duct up.
 
Jim McGrew
40134
 
--> RV10-List message posted by: Sean Stephens <schmoboy(at)cox.net>

Why not just duct it up to the defrost exit? Accomplish two things with
one fan!

-Sean #40303

Marcus Cooper wrote:
Quote:

Jim,

Sounds like reasonable idea to include a fan in the tunnel  how do
you plan to duct the source and exit air?

Marcus

40286



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PostPosted: Sun Feb 19, 2006 5:07 pm    Post subject: Defrosters Reply with quote

I just scoped out my panel today to see where I was going to mount my
fan too. I think I'll only put in one, and put it in the same spot
mentioned....aft of the subpanel, just Left of the centerpost.
There is about 1" available in front of the subpanel, but I don't
think it's worth driling in up there.

As a side note on temps.... You may have seen my post that today's
flying was in 10F type weather. I had the heat on full and it
was very comfortable in the cabin. My GRT EIS has an internal temp
display and it was pretty interesting to see that the temp went
from about 90F to 110F over time....and that's with the cold
temps. I don't know if that's because it was just getting front
heat rising behind the panel, or if in the summer it'll be real
hot there too. What it looks like though, is that in the winter
when it's cold, you probably don't need to duct heat to the
windshield, because with front heat on it should rise and the
fans would take care of the blowing. In the summer, I think
there's the chance that I'll be happy I installed an avionics
fan to keep things cool.

It sure was good to see the heater works well. My old plane would
have been pretty chilly in those temps.
Tim Olson - RV-10 N104CD - Flying
do not archive
JSMcGrew(at)aol.com wrote:
Quote:
Actually, I'm working on this today. I am going to mount the computer
fan in the tunnel cover forward of the fuel selector valve (directly
over the boost pump and filter). It will be offset to the left to allow
the rear cabin heat scat tube to go by. The fan will blow cool air down
into the tunnel and should exit on its own to the cabin: there are
enough openings at the front of the tunnel lid and out underneath the
front seats to allow for adequate flow. I am going to try this to,
hopefully, avoid taking out all the fuel lines to install insulation on
the tunnel floor.

The defrost fan will be under the glareshield aft of the subpanel and
left of the center rib. It will probably get enough heat from the radio
stack and maybe even draw some air up from the heat vents that are
directly underneath. There simply isn't enough room under my panel to
easily run a duct up.

Jim McGrew
40134



Why not just duct it up to the defrost exit? Accomplish two things with
one fan!

-Sean #40303

Marcus Cooper wrote:
>
> Jim,
>
> Sounds like reasonable idea to include a fan in the tunnel how do
> you plan to duct the source and exit air?
>
> Marcus
>
> 40286
>



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