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Old 12-26-2012, 06:56 AM
newt's Avatar
newt newt is offline
Join Date: Jan 2011
Location: Sydney, Australia
Posts: 429
Default Hot weather and flying

Rather than hijack Bob's thread, here's a second one for the alternative extreme.

What's the hottest temperature you'll fly in?

Last weekend I taunted some friends who fly shark patrol by waving an ice-cold bottle of water at them from the other side of the security fence as they stumbled out of a sweat-soaked Cessna 172 at 40 deg C (about 105 deg F)

I'm not a huge fan of flying when it's hot. I've observed the CHTs nudging 400F on climbout from sea level on a 36 deg C day (about 95 deg F). Easily fixed by dropping the nose a bit to increase the climb speed, or perhaps by levelling out and flying at full rich cruise power for a few minutes to let the temp come back down before resuming the climb. By the time I get above 5000' the combination of manifold pressure and adiabatic cooling basically solves the problem.

But I don't like having to solve it.

Besides that, being in a bubble canopy when it's that hot is pretty miserable at the best of times. Even when I'm up where it's cool and high, I know you'll have to get hot and low again eventually.

I'm not alone in feeling like this, right?

- mark
[ Paid up on 16 Jul 2021 ]
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Old 12-26-2012, 08:51 AM
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pierre smith pierre smith is offline
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,911

Mark, do you not have a Koger sunshade?

Here in Georgia it also pushes 100? and that shade is a real blessing.

Rv10 Sold
46 years ag pilot/CFI
Air Tractor 502/PT-6
Building RV-12, Wings, fuse, emp complete. FWF in progress.
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Old 12-26-2012, 09:02 AM
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zilik zilik is offline
VAF Moderator
Join Date: Jan 2005
Location: Pine Junction, CO
Posts: 657

I followed Rosie a couple of years ago from Carson City to Las Vegas. We were quite comfortable at 11.5 and when we tuned in the ASOS at Boulder City it reported 115F. I commented that I thought aluminum melted above 100F, I really did not want to go down. After a quick turn we departed Boulder City for southern California and climbed up to 12.5 for cooler air.

I don't remember having cooling problems during the climb. I climb full rich in the heat to help keep things cool.

From Rosie: Living in the desert, (full rich) takeoffs above 110F is normal, and I'm starting out at 2500' MSL (density altitude is >6K). My EI temp gauge alerts me at 430F to start leveling out, and I have NO problem letting the hottest cylinder see 450F for a moment in the level flight. When the highest cylinder temp is below 400F, I'll start an easy climb to altitude and also start leaning the mixture on the way up. My first-run cylinders went to 2500 hours with no complaints.

As for clothing, when it's REALLY hot, I like to wear the Lightweight, Polyester-Tricot Shirts that breath, much more comfortable than cotton
Gary "Seismo" Zilik
Pine Junction, Colorado
RV-6A N99PZ S/N 22993 SOLD

Last edited by Rosie : 08-21-2013 at 07:23 PM. Reason: Added hotlink to the shirt
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Old 08-20-2013, 04:53 PM
BillFear BillFear is offline
Join Date: Oct 2007
Location: Sherrills Ford, NC (Lake norman area)
Posts: 432
Default Too hot in climb

I am starting to fly the 7a higher and was surprised yesterday with CHT issues in Michigan in a climb from 5k to 11k. it was not that hot (80F on the ground) but I was only able to get 300fpm or so to keep the CHTs below 425 in the climb! I was leaning all the way up. I noticed this post, do others use full rich mixture in extended climbs? Its a Matituck O360 with CS hartzell, WOT and 2500rpm.

had no issues at all with oil temps.

Originally Posted by zilik View Post
I followed Rosie a couple of years ago from Carson City to Las Vegas. We were quite comfortable at 11.5 and when we tuned in the ASOS at Boulder City it reported 115F. I commented that I thought aluminum melted above 100F, I really did not want to go down. After a quick turn we departed Boulder City for southern California and climbed up to 12.5 for cooler air.

I don't remember having cooling problems during the climb. I climb full rich in the heat to help keep things cool.
Bill Fearheiley
Lake Norman, NC (14A)
RV7a N705RP (no longer own)
Contribution in for 2017, money well spent
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Old 08-20-2013, 05:10 PM
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Toobuilder Toobuilder is offline
Join Date: Jul 2009
Location: Mojave
Posts: 4,841

Left Parker AZ one afternoon last month and the OAT on taxi was 121F.

Not comfortable at all. It was still in the mid 80's at 9,500.
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C
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Old 08-20-2013, 05:16 PM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,637
Default Temperature

Five summers of full time flying along the Colorado, mostly out of Lake Havasu City. Record high in Havasu is 128. The airplanes were parked outside and I figure the temp inside the airplane had to be 150 with outside temps in the mid 120's.
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Old 08-20-2013, 07:39 PM
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turbo turbo is offline
Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,175

Flying in hot wx makes me think about this years Oshkosh. Cool wx and no flying incidents as far as I know of. Fly hot and stay hydrated. I always carry some h2o in the plane. I like those glass containers from the lemonade drink. There is always at least one full stashed along side the seat.
TURBO YES =VAF= Payed Jan2021
Ed D'Arcy
RV6-A 5,300+ hrs, R-44 1,600 hrs, Helicycle traded for 33 FFR coupe, 300 young eagles flown
Stuart, Fl / East Hampton,Ct / Virgin Gorda, BVI - villa sold.
addicted pickle ball player
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Old 08-20-2013, 09:01 PM
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digidocs digidocs is offline
Join Date: Apr 2007
Location: -
Posts: 544
Default Bumps!

The worst part about flying in hot weather down here is the bumps. Pretty much guaranteed to take a beating down low. It really makes me think twice about taking passengers after 11 am or so.

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Old 08-20-2013, 10:51 PM
eddieseve eddieseve is offline
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 617

Hi Mark,

Anne-Marie (my wife) and I had 57C in the cockpit flying towards Wilcannia (follow the link below to see where it is in Google maps), this was on the way to Broken Hill, I'm really not sure how accurate our cabin digital thermometer was, but OAT was 42C, and that was at 5500ft two years ago in early November.

Anne-Marie asked me to land at Wilcannia so that we could get some shade because she was starting to feel really heat stressed and that was with a sunshade fitted to the canopy.

Luckily there was a shelter at the airport and we had a couple of camel packs full of water with us that we poured over each other to cool down.

30 minutes later we where both feeling good enough to do the reminder of the flight into Broken Hill where we met some friends who collected us in an air-conditioned Holden Commodore, it never felt so good to get out of the heat before in all my life.

When we got to where we where staying we both jumped into the pool which believe it or not, felt freezing cold at 26C

My CHTs where 40F hotter than normal, but never exceeded 400F on climb out.

If you look at the map, zoom in, and you'll see the airport is 4km North of the town, we took shelter in the building south of the main runway.

Eddie Seve
Sydney Australia
First Flight 16th July 2012
RV-7 Phase 2, 30 Oct 2012
1100 hrs Feb 2020

Last edited by eddieseve : 08-20-2013 at 11:03 PM.
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Old 08-21-2013, 09:57 AM
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Neal@F14 Neal@F14 is offline
Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182

I used to fly my old Cherokee 140 in 110+ Texas summer heat all the time when I first bought it. Yes, it was uncomfortable, but I learned a lot about density altitude and flying an underpowered aircraft is such conditions too. I think the hottest I ever flew it in was 118 degrees at the surface. Arrived at my home airport at +6500AGL and circling down over the airport to pattern altitude was like descending into a blast furnace. Nobody else was dumb enough to be out flying that day

The hottest I've ever flown an RV was 114 at the surface, and that was the OAT here in W.Falls when coming home from Oshkosh a couple years ago. It was miserable, hot and bumpy, but still made a nice smooth wheel landing.

I don't like to intentionally go on a "pleasure flight" in an RV if the temps are over 100. Above that, it's just not fun anymore. On hot summer days, we gotta do our pleasure flying early just after sunrise and be back home on the ground by about 10:00am before the thermals get miserable.
Neal Howard
Airplaneless once again...

Last edited by Neal@F14 : 08-21-2013 at 10:05 AM.
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