REFLECTOR: A/C (was Re: GRT Displays overheating - Anyone else seethis?)

Wed Jul 11 08:07:37 CDT 2012

Chris,
The Seamech company developed several air conditioning systems for Velocity XL models; one with a Lycoming IO-540 and the other with a TCM IO-550.
Scott B.

Scott Baker

On Jul 11, 2012, at 8:53 AM, Chris Barber <cbarber at texasattorney.net> wrote:

> I just sent a text to the owner of Seamech asking for some detail.  I know he has considered sales to individuals but has not focused on it.  My plane was kinda his prototype for a Velocity/Canard.  He is building a RV-7 with a Soob with his A/C
> 
> Chris
> 
> ________________________________________
> From: reflector-bounces at tvbf.org [reflector-bounces at tvbf.org] on behalf of Lawrence Epstein [ljepstein at hotmail.com]
> Sent: Wednesday, July 11, 2012 6:27 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: A/C (was Re: GRT Displays overheating - Anyone else seethis?)
> 
> Can you give specs/cost info on your A/C (the Seamech website is light on details).
> 
> Larry E.
> 
> On Jul 9, 2012, at 9:51 AM, Chris Barber <cbarber at texasattorney.net> wrote:
> 
>> Interesting you mention the A/C Mark. My first three flights were without A/C....well, on the third I turned it on while taxiing back to the hangar.  The guy who supplied me with the A/C (owner of SeaMech Environmental Systems...provider of A/C to Beechcraft, Cirrus, Cessna) is wanting me to use the A/C now that I think I have my cooling under control and I think I will on my next flight.  The certified models he installs are rated for use at takeoff.  I am still just flying around the airport.
>> 
>> It is ridiculously hot...but of course it is Houston in July...what would I expect.  As I have stated, if I am gonna fly in the heat, I need to test in the heat.
>> 
>> Chris Barber
>> Phase One Testing
>> 
>> ________________________________________
>> From: reflector-bounces at tvbf.org [reflector-bounces at tvbf.org] on behalf of Mark Magee [edjonesbrady at gmail.com]
>> Sent: Sunday, July 08, 2012 10:45 PM
>> To: Brett Ferrell; Velocity Aircraft Owners and Builders list
>> Cc: reflector
>> Subject: Re: REFLECTOR: GRT Displays overheating - Anyone else see this?
>> 
>> Hi Brett,
>> You guys all laughed at me and my longings toward cabin A/C... We closed out that thread. I agree with GRT on the vents except I'd consider some 12V pc power supply fans, one port one starboard, blowing up on the windscreen. This would double as winter defogger/deicer. With the doors open until after run-up you should be getting a fresh flow of 100F air on a hotter day. If you can get aloft into cooler air I'd think you'd have a shot at keeping the Glass out of over temp. Pretty simple fix, two holesaw cuts on your glare shield and mount the fans and grab 12V from same circuit powering the GRT's: those fans pull very little power.
>> Frankly I'd even consider laying a Blue Ice pack or two below my Glass displays secured somehow for summer work until this confounded La Nina weather pattern subsides.
>> Or install A/C: I'm game!
>> My $.02 USD.
>> 
>> Mark B. Magee
>> N34XL
>> Sent from IPhone 4
>> 
>> On Jul 8, 2012, at 9:36 PM, "Brett Ferrell" <reflector at velocityxl.com> wrote:
>> 
>>> We've had quite a string of hot weather here in SW Ohio as of late, and on the last couple of flights we've had issues with our GRT HX screens overheating and shutting down in flight.  We've got backup dial gauges, but needless to say, it's disappointing when you lose the fancy readouts, and though we've been planning to fly to Airventure we will likely won't if we can't quickly find a solution to the issue.  Has anyone else seen this behavior?  If so, how did you resolve it?
>>> 
>>> GRT tell me that the screens should run 'about 30 degrees' above ambient.  They will shut down at 160 F, and you can see the internal temperature by going to setup menu (Display Maint, Analog Input page).  It's been right at 100 F here for the last few days, and I can confirm that on the ground they warm right up to 130.  We went around the pattern and in less than two passes they were shutting down!  I went to the setup page, and sure enough, they were reporting in the mid 150s.
>>> 
>>> GRT believes that if I add vents to my glaresheild the issue will resolve itself, but I have already tried a large (68 cfm) computer fan aimed at the back of the displays, which only relieved about 1 degree F of temperature, and tried routing cooling air from the nose fresh air vent to the back of the displays to no effect (the screens still shutdown in flight).  I believe my situation is unique because I mounted a second oil cooler in the nose for winter recirculating air usage (rather than  cold outside air), and have checked this cooler is, in fact, getting quite hot.  On my last flight it was over 200 F even though the one on the nose NACA was below 180, so I think this cooler is just filling the nose area with hot air.  Net, I'm going to pull that cooler, and at some point put vents in the glaresheild, but that's a fair amount of effort the way I have it mounted.
>>> 
>>> Brett
>>> _______________________________________________
>>> 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
>> 
>> _______________________________________________
>> 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
>> _______________________________________________
>> 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
>> 
> 
> _______________________________________________
> 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
> _______________________________________________
> 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