REFLECTOR: Update on my Subaru installation

Sun Mar 29 18:23:03 CDT 2009

Alex, 

I have seen the final form of Dave's beast. Unless something was different, I'm not surprised there wasn't enough pressure to turn the air thru the radiator to get effective cooling. There might not be enough for mine either, but the NACA's feed straight into the cooling fins. There is an expansion area, but no turns to go thru the fins. 

I have a backup plan to add a touch of a scoop onto the NACA's if I need it, but I want to try it without first. 

I am using a solid state motor controller on the blower so that I have infinate motor speed without the need for a wasteful balast resistor. Since everything is electric, I needed to save power wherever I could.  My blower pulls from inside, just like your system. I have 6 air vents for the cabin, so when it is hot you can pull in fresh air, run it through the core, exit outside right in front of the nose strut. 

When heat is needed in the cabin, mine is like yours with outlets at the feet, but I have a smaller tube running up to a defroster on the windshield too. 

I have a picture of the radiator setup (without the engine in the way) at home. I'll dig it up and send it to you. 

Wish I was home in the hangar working on the V, but I had to come to work to pay for the next step... paint & interior. 

Kurt 

-----Original Message-----
From: Alex Balic <velocity_pilot at verizon.net>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Sun, 29 Mar 2009
 4:05 pm
Subject: Re: REFLECTOR: Update on my Subaru installation

Hi Kurt-

You might make some preliminary plans to construct a ram scoop for your radiator- Dave Bertram tried to use a NACA to get air for his Chevy and could not get enough pressure- now he has a ram scoop- I learned from that and built the ram scoop from the start- maybe your config is different somewhat and might get enough? Not sure, but something you might at least think about for later

I have the stock Velocity oil cooler up front running coolant- I insulated the lines so they do not transfer to each other and run in the pilot side duct, I have a blower a fan like you have (no external scoop) it pulls from cabin over the top of the canard, through a block off panel I have on there, and dumps at the feet- 2 speed fan- it works nice already, but I do not have any provisions to dump overboard- I might need to look at your setup if this becomes needed.  You mentioned that you have 2 radiators in the back- do you have a picture of this installation- would be interested to see how that works,.

Alex

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of nmflyer1 at aol.com
Sent: Sunday, March 29, 2009 4:34 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Update on my Subaru installation

Alex, 
 I have 2 XL sized NACA scoops on the top. One feeds the upper radiator, the second provides flow to the intake, alternator & across the=2
0fuel rails. I have a second NACA underneath that feeds the lower radiator & Oil cooler. In effect it acts like a ram scoop in climb, and a Naca in cruise. At least that's what I had in mind. As you know, the proof is in the testing. 

The heater core in the nose is a big ford van heater core with a blower motor attached. I can duct inside for heat, or outside for extra cooling. It uses NPG+ and is plumbed much like a stock Velocity oil line situation. One down one side, returning on the other side. 

I also designed exit scoops hoping that the prop would pull air straight thru the NACA scoops. That should create flow through the radiators, across the fuel rails and the bottom of the oil pan. I hope that, with the boost cooler in the nose, that I have enough flow to taxi withoug building up too much heat. 

Kurt 

-----Original Message-----
From: Alex Balic <velocity_pilot at verizon.net>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Sun, 29 Mar 2009 11:15 am
Subject: Re: REFLECTOR: Update on my Subaru installation

That engine sounds really good Kurt- I think we will have a really good lineup at Oshkosh in a few years- we have V-8, V-6, Rotary, and Subaru powered Velocities- 

What sort of scoop are you running to your radiator? And are you running coolant or oil to your heater core in the nose?

Alex

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of nmflyer1 at aol.c
om
Sent: Sunday, March 29, 2009 10:25 AM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Update on my Subaru installation

If you decide to go with the Evans, chose the NPG+, not the re gular NPG. The NPG+ addresses some of the issues Al mentioned. I am using it, and haven't had any issues on ground runs. Time will tell about In the air. 

It is interesting how many different power plant & cooling methods Velocity builders are using. Can't wait for our big fly in!

Working on Interior stuff and finishing up the cowl aft of the wing attach fins. Then block for paint. 

 Kurt Winker
173 FGE 
340 HP Aluminum V-6
Sounds great, Hear it at:  http://www.youtube.com/watch?v=MT-0zHmcp9o

-----Original Message-----
From: Alex Balic <velocity_pilot at verizon.net>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Sat, 28 Mar 2009 9:13 pm
Subject: Re: REFLECTOR: Update on my Subaru installation

Right now I am running a 25% glycol solution with a 16 pound cap I have some of that “RedLine” wetting agent in there too- not sure if that works, but it sure won’t hurt anything- Subaru’s usually don’t have cooling issues- good design I guess, just need to make sure I have a good seal around my radiator- if I am loosing coolant, I will change to20a 24 pound cap- I have a pressure sensor on the coolant, so I can sure keep an eye on it- Evans coolant wa s a plan B- always good to have plenty of Plan B-s laying20around I always say…….  J

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Al Gietzen
Sent: Saturday, March 28, 2009 8:12 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Update on my Subaru installation

Well; Sid, I’ll have to disagree with your disagreement.  The pressure exerted on the spring is the differential pressure on the seal plate, which is dependant on the ambient pressure outside.

I use a double cap setup; 15 on the filler neck; 23 on the expansion tank.  

Alex; before you get too serious about the non-aqueous coolant, take a look at the viscosity (pump power, pressure drops) and the specific heat (requiring greater flow rates for the same heat removal).  To me it all adds up to a poor choice; and the two people I know who have tried it gave it up as a bad idea.

Best coolant is water, with just enough EG (or other) for corrosion protection.

Al

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Sid Knox
Sent: Saturday, March 28, 2009 3:38 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Update on my Subaru installation

I have to disagree here... the seal is working against a spring, not ambient 
0A

0A 

pressure.  Therefore, altitude is not a factor, or at most, a minor factor.

Sid

----- Original Message ----- 

From: "Laurence Coen" <lwcoen at hotmail.com>

To: "Velocity Aircraft Owne rs and Builders list" <reflector at tvbf.org>

Sent: Saturday, March 28, 2009 1:23 PM

Subject: Re: REFLECTOR: Update on my Subaru installation

I really should read these things before I hit send.  I should have said a 9 

psi cap at sea level or 24 psi absolute pressure.   That 14 psi cap would 

give about 29 psi absolute at sea level.  A 20 psi cap should handle things 

=0 A 

to 12,000 plus feet.

Larry Coen

N136LC

From: Laurence Coen

Sent: Saturday, March 28, 2009 1:37 PM

To: Velocity Aircraft Owners and Builders list

Subject: Re: REFLECTOR: Update on my Subaru installation

Alex,

At 10,000 feet you lose about 5 psi of atmosphere making your 14 psi cap a 9 

psi cap absolute pressure.

Larry Coen

N136LC

_______________________________________________

To change your email addr
ess, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery

user:pw = tvbf:jamaicangoose

Check new archives: www.tvbf.org/pipermail

Check old archives: http://www.tvbf.org/archives/ve locity/maillist.html

_______________________________________________

To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery

user:pw = tvbf:jamaicangoose

Check new archives: www.tvbf.org/pipermail

Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

Need a job? Find employment help in your area. 

_______________________________________________

To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery

user:pw = tvbf:jamaicangoose

Check new archives: www.tvbf.org/pipermail

Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

Need a job? Find employment help in your area. 

_______________________________________________
o change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
Visit the gallery!  www.tvbf.org/gallery
ser:pw = tvbf:jamaicangoose
heck new archives: www.tvbf.org/pipermail
heck old archives: http://www.tvbf.org/archives/velocity/maillist.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20090329/543b2951/attachment-0001.htm>