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Old 05-09-2018, 03:15 PM
hesty hesty is offline
Join Date: Jul 2010
Location: Boulder City, NV
Posts: 44
Default Another RV-7A takes its first flight!

VAF Community,
After 7.5 years my "QB" RV-7A finally got airborne last week and I already have 10 hours on her. A great moment and I was able to share it with a builder friend who came with though the FAA Qualified Pilot program. I am concentrating almost entirely on the proper engine break-in/seating of rings. I have a few questions for the VAF guys in the know. As I have close to 10 hrs, I am expecting the rings to seat very soon and CHT's to drop. I am wondering what kind of drop I should see. As I am doing the phase one unfortunately a little too late for ideal cool temps in the Las Vegas area. Oil consumption seems somewhat minimal, buy higher than I would expect if the rings had already seated. The highest I've seen is about 418 for a couple min on the initial climb. It's a new stock lycoming IO360-M1B engine. MT CS prop. Wheel pants are not installed. Nose leg/pant is complete and can be installed, but the mains are not completed yet. Below are some cruise reference numbers to help build a picture...

4500 ft, 7170 ft DA, WOT, 2400RPM, OAT 82F, oil temp 184, 130 IAS kts
CHT's: 388,391,373,391

4500 ft, 7130 ft DA, WOT, 2500RPM, OAT 82F, Oil temp 186, 132 IAS kts
CHT's: 392, 397, 375, 382

4500 ft, 7160 ft DA, WOT, 2450RPM, OAT 83F, Oil temp 184, 131 IAS kts
CHT's: 388, 394, 372, 389

My biggest question is when should I expect the seating to occur? Will it be sudden? What kind of drop in CHT's should I see?

If the temp drop is not significant, I think I will need to make cowling adjustments to lower the CHT's so the plane is useful in warm weather.

Thanks for any insight and input. I have read a bit on VAF about the break-in process, but have not seen what to expect.

Chad Hesterman
Boulder City, NV
Chad Hesterman
Boulder City, NV
working on wrapping things up before Airport move. RV-7A slider.
Lycoming IO360 engine and MT 3-blade.
(2016 =VAF= Donation made)

Last edited by hesty : 05-10-2018 at 11:45 AM. Reason: add pics
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Old 05-09-2018, 03:23 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,109
Default Congratulations

Chad------big Congrats on the new fledgling

Photos ------ aint official until the photos, ya know..........
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 05-09-2018, 04:49 PM
TS Flightlines TS Flightlines is offline
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,930

CHAD====congrats my friend on a major milestone!!
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7A Tail Kit Completed, Fuse started-Pay as I go Plan, on hold while we develop new products for RV builders
Ridgeland, SC,
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Old 05-09-2018, 05:09 PM
DeltaRomeo DeltaRomeo is offline
Join Date: Jan 2005
Location: Highland Village, TX
Posts: 4,245

Congratulations Chad!!!! Looking forward to more flying posts down the road.

Doug Reeves (your host)
  • Full time: since '07 (started it in '96).
  • Typed in the EMB-505 (Phenom 300). Available for contract work. (flying resume).
  • Part time: Supporting Crew Member CAE EMB-505 Level D Sim @ KDFW.
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Old 05-09-2018, 06:11 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest
Posts: 1,829
Default Congrats

Congrats. Now that I am building this means more to me than when I was a lurker.
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2021, worth every penny

RV9A- Status:
95% done, 5% left to go
Electrical/Panel done
Firewall Forward 95% done (waiting on fiberglass to be done)
Fiberglass 5%
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Old 05-09-2018, 06:23 PM
Kyle Boatright Kyle Boatright is offline
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,677

Installing your wheel pants will make a noticeable improvement in your CHT's.

My experience with break in was there was no step change in CHT's.
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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Old 05-09-2018, 06:58 PM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,644
Default CHT

Think of two separate scenarios for CHT. Before the rings seat and after the rings seat.
Before the rings seat every effort should be made to keep the CHT below 400, a momentary excursion to 425 is unlikely to glaze the cylinders.
After the rings are seated longer periods at or just below 425 are unlikely to hurt anything.
I have a lot of experience with Pitts Aircraft, parallel and angle valve 0 360 and parallel valve 540.I don't recall ever flying a Pitts with a CHT gage. Those engines likely saw a lot of CHT time at or near the red line. Never a problem.
I had to break in my 0 320 in 110-120 temps in July in Havasu. On the climb if the CHT started past 400 I pulled the power back and leveled off.
I never did see a significant CHT drop in cruise, just in climb. Never burned any oil from hour number one.
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Old 05-09-2018, 09:48 PM
jcarne's Avatar
jcarne jcarne is offline
Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 1,983

Congrats good sir!
Jereme Carne
RV-7A Flying as of 03/2021
Exempt but gladly paying!
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Old 05-10-2018, 07:46 AM
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Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,340

What Kyle B. said. The landing gear creates a LOT of drag that the engine must overcome with power/heat. Once the fairings are installed, you'll see 15-20 Kts faster cruise and can climb faster at the same power settings so you'll have more cooling air over the engine.

Mine did the same thing. Go ahead and install the nose gear fairings and you should see some improvement. If you have P-Mags, retard their timing a few degrees until the mains are installed.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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