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Old 08-02-2018, 06:31 PM
kblack kblack is offline
Join Date: Mar 2008
Location: Granbury, Tx
Posts: 26
Default Air Conditioning

Just spoke w/ Bill at Airflow Systems ( Very helpful! Really wish they had more photos on website, although I did learn a lot from those posting here on VAF. Figured some others may have similar questions, so...
  • Quickbuild presents no problems. AFAIK, baggage floor is not installed by Van's. If it is, then an access needs to be added for condenser lines.
  • Routing lines down pax sidewall is a good way to go, since it is cooler and does not further clutter the tunnel. Builder routes the lines then obtains a loaner crimping tool from Airflow to install fittings.
  • Airflow offers a so-called "Australian" option for increased evaporator airflow, but I don't think I need it. Adds about 5 lbs and 5 Amps draw.
  • Evaporator airflow can be improved by using flat vents in place of eyeball vents in overhead. I'm planning to use the carbon fiber Aerosport Products Overhead Console (, but may stick w/ the cool looking (costly!) eyeball vents.
  • Installed system weighs about 40 lbs
  • I will forego a fresh air mixing valve in favor of keeping stock front and rear fresh air vents. Not as elegant, but really simple.
  • Panel switches include an ON-OFF and a separate 3 position fan speed control.
  • From what I can tell, early problems with belts and idler pulley have been solved w/ serpentine belt system.
  • Recommends turn-down exhaust extensions to both direct hot exhaust away from condenser, and help quieten airplane.
  • Recommends sending flywheel to engine builder (in my case, Barrett) and tell them to make sure the pad on the lower LHS of block is drilled and tapped w/ studs for the compressor/idler mount.
  • Recommends increasing oil cooler from stock 13-row to 15-row, which needs turning vanes at inlet to improve air flow. Also, install manually operated butterfly in duct to oil cooler to regulate as needed.
  • Recommends adding cowl louvers on lower side(s) for improved exit air flow that can later be blocked if it's more than what is needed for engine/oil cooling. Bottom of cowl is not a good place due to higher pressure at that location.
  • Recommends sealing corrugated panels in aft baggage bulkheads.
  • Evaporator sits on shelf and is accessed by removing upper aft baggage bulkhead for freon charging, etc. Return air is appx 6" square penetration in lower aft baggage bulkhead.
  • Expect installed system to shift CG about 1/2" aft.
FWIW, I've just about settled on sticking w/ standard updraft, fuel-injected, using 9:1 compression for about 275hp. I really prefer cold air induction, but will likely choose to not deal w/ all the cowl, exhaust, and other work needed to make that work. If it were up to me I wouldn't install air conditioning, but it's not up to me.
Granbury Texas
RV-7 QB (N74KB) - Flying
RV-10 QB - Empennage Started
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Old 08-02-2018, 06:47 PM
9GT's Avatar
9GT 9GT is offline
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,536

I had my RV-10 transition training with Alex in TX during September. His 10 had AC and you will be glad you installed it 🔥🔥
David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2019
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Old 08-02-2018, 08:40 PM
greghale greghale is offline
Join Date: Jan 2006
Location: TULSA, OK
Posts: 52
Default Air conditioning

I have Airflow-Systems air conditioning in my RV10 since 2010 when I built it. I can't imagine flying the -10 in Oklahoma's hot summers without it. It has been working perfectly. Bill is an easy person to talk to and sells a great product. If you have any questions from a satisfied customer, give me a call. I occasionally go to flyins in the Grandbury area and would be glad to give you a ride to see the difference. I'm located in Tulsa at KRVS.
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Old 08-03-2018, 09:17 AM
Lynnb's Avatar
Lynnb Lynnb is offline
Join Date: Jan 2014
Location: Cedar Hill, TX
Posts: 229

Interesting, I've got most of my airflow systems A/C plumbed firewall back and he never mentioned anything about.
1. Needing exhaust extensions.
2. Needing a return air in the rear bulkhead.
3. Needing to increase the size of the oil cooler.

Not sure on your engine, but he sent me a machined flywheel to replace my stock one.

You're welcome to come check out my install, I'm just south of Dallas in Cedar Hill.

RV-10 in Process
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Old 08-03-2018, 11:33 AM
woxofswa woxofswa is offline
Join Date: Sep 2007
Location: Mesa Arizona
Posts: 520

I have Bill’s system on my 10. Just clipped 500 hours.
Loved it on the most recent OSH trip. No matter what anyone says about not being needed once you’re in the air, that cabin can really heat up in the sun. If you’re facing the sun, the windscreen is like a magnifying glass and you’re the ant even if the OAT is mild. If you have it, you’ll use it way more than you anticipated.

I have the larger 07 oil cooler and did have to add a butterfly just to keep it in the green in winter.

I have the shark gills on the side.

I operated the system for about the first year using tailcone air. I then fabbed a cabin air inlet. Minor improvement, especially in taxi.

I have the exhaust tip extenders. They come with a single bolt each but the bolts aren’t necessary. Just slip them on, they won’t come off. I don’t use them all the time, just short hops in hot weather. They do make a difference, especially in descent when warm air does seem to enter the scoop.

Never heard of the Australian option.

If building again I would absolutely, without hesitation, install A/C again.
Myron Nelson
Mesa, AZ
RV-10 BPE, Dynon, Airflow systems A/C
First flight May 10, 2014
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Old 08-03-2018, 03:05 PM
N42AH's Avatar
N42AH N42AH is offline
Join Date: Dec 2007
Location: RV-10 based at SC99 - Whiteplains Airpark
Posts: 362
Default Comparison...

How does this compare with Flightline's AC systems?
Steve Crimm
Gilbert, SC
Based - SC99
RV-10 N256H
N42AH Reserved
Europa Monowheel XS N42EU - SOLD
BH-206B3 N42AH- SOLD
BH-206B3 N43AH - SOLD
Track N42AH/ N1FLY
Donation made for 2018
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Old 08-03-2018, 04:20 PM
hgerhardt's Avatar
hgerhardt hgerhardt is offline
Join Date: Oct 2006
Location: torrance, ca
Posts: 442

Originally Posted by kblack View Post
...[*]Installed system weighs about 40 lbs
Interesting. I read a very thorough pirep from an engineer who installed an AirFlow Systems unit on his Glasair II and his W&B table shows weight increased 60 lbs... did you happen to actually measure your installed weight? Or did Bill significantly lighten his system recently?
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Old 08-03-2018, 04:37 PM
sirlegin's Avatar
sirlegin sirlegin is offline
Join Date: Feb 2006
Location: Keller, Texas
Posts: 271

Originally Posted by 9GT View Post
I had my RV-10 transition training with Alex in TX during September. His 10 had AC and you will be glad you installed it 🔥🔥
Are you installing a/c in the 9?
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Old 08-06-2018, 02:14 PM
kblack kblack is offline
Join Date: Mar 2008
Location: Granbury, Tx
Posts: 26
Default Follow Up

Several items like Exhaust Extensions, Return Air Grill Location, ..., came up because I specifically asked. Weight is what I was told. My bet is that does not include things like an overhead console to distribute the air. It may also omit hoses which vary due to builder routing preferences.

I'll definitely plan to follow up w/ some of you guys to see your installations as I get a bit further along. Thanks for the offers!
Granbury Texas
RV-7 QB (N74KB) - Flying
RV-10 QB - Empennage Started
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Old 08-07-2018, 09:07 AM
Lynnb's Avatar
Lynnb Lynnb is offline
Join Date: Jan 2014
Location: Cedar Hill, TX
Posts: 229

Edit: I finally found the log entry and total weight for the components from Bill came in at 43 lbs. This was for all the normal components, compressor, brackets, hoses, scoop, condenser, shelf, New Flywheel, etc. Everything he sent. So now you have to add to that the weight for refrigerant and the overhead console, and any other misc.

One thing I will say is Bill has been great at sending different fittings as I modified the install for my plane. The install has added a lot of time to my build, but it's the one thing I've wanted from the beginning.

RV-10 in Process

Last edited by Lynnb : 08-08-2018 at 08:12 AM. Reason: weight
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