VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Model Specific > RV-7/7A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-17-2022, 08:48 AM
mark@topogen.com's Avatar
mark@topogen.com mark@topogen.com is offline
 
Join Date: Dec 2020
Location: Buena Vista
Posts: 31
Default Contrails when doing acro??

Put the Go Pro 360 on canopy top and noticed some vapor/smoke on rudder coming out of an aileron roll. I'm just wondering what might explain this phenomenon??

https://youtu.be/mol9nSBU-zQ
__________________
2008 RV-7A flip up
IO360; CS Composite prop
4 GRT EFIS (3 WS, 1 HX); IFD440 Driving it all.
Baggage access door behind Pilot seat

Mark@topogen.com
Reply With Quote
  #2  
Old 07-17-2022, 09:58 AM
nohoflyer nohoflyer is offline
 
Join Date: Sep 2018
Location: Brooklyn, NY
Posts: 320
Default

Chemtrails silly. Didn’t you know vans sneaks them into every build?!
__________________
RV-7A builder
A320 Capt at some airline
T-37/T-38/KC-135
C-177/172
Piper Warrior
2022 donator
Emp complete
Wings complete
Working on fuselage
Reply With Quote
  #3  
Old 07-17-2022, 10:02 AM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 572
Default Oil ???

Seems to come from below the rudder, could it be engine oil if negative G for a brief moment??

If not, moisture in the air but there should'nt be an abrupt airflow change of direction from the tail when doing a roll.
There's more chance of moisture condensing around the ailerons...??
__________________
Eric,
2022 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ, RV-8, "Dragonfly", flying
C-GNFJ, C72R Cutlass, flying
Reply With Quote
  #4  
Old 07-17-2022, 10:03 AM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 572
Default

Quote:
Originally Posted by nohoflyer View Post
Chemtrails silly. Didn’t you know vans sneaks them into every build?!

Chemtrails!!!
__________________
Eric,
2022 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ, RV-8, "Dragonfly", flying
C-GNFJ, C72R Cutlass, flying
Reply With Quote
  #5  
Old 07-17-2022, 10:32 AM
smithflys23's Avatar
smithflys23 smithflys23 is offline
 
Join Date: Feb 2017
Location: Jupiter
Posts: 308
Default

Looks like a little bit of engine oil to me.
Reply With Quote
  #6  
Old 07-17-2022, 11:43 AM
Lkitson's Avatar
Lkitson Lkitson is offline
 
Join Date: Feb 2014
Location: Harleysville, PA
Posts: 73
Default

I noticed the same thing when reviewing the rear facing go-pro footage from my phase 1 acro testing. A puff of smoke came out from under the tail after a hammerhead turn. I attribute it to oil sloshing around in the engine, coming out the breather tube, hitting the exhaust and turning into smoke.
Attached Thumbnails
Click image for larger version

Name:	Presentation1.jpg
Views:	60
Size:	49.0 KB
ID:	28243  
__________________
RV-8 Flying as of 12-4-21. Phase 1 completed 6-25-22


http://www.mykitlog.com/users/catego...846&category=0
Reply With Quote
  #7  
Old 07-17-2022, 12:58 PM
Plummit's Avatar
Plummit Plummit is online now
 
Join Date: Apr 2010
Location: SoCal
Posts: 1,589
Default

Don't bring that polluter to Kalifornia... The A.Q.M.D. and California Air Resources Board (CARB) win you out of town on rails!

-Marc
__________________
RV-10
N814RV
2022 Donation Made
Plus extra donation for someone who didn't
Reply With Quote
  #8  
Old 07-17-2022, 01:41 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 3,113
Default And

If the humidity and temperature are right, low pressure air can cause the moisture to condense and this will result in the formation if a “contrail”…
__________________
Bob
EAA Tech Counselor
Aerospace Engineer '88

RV-10-ER
N464RL
Going to Paint at Evoke!
Garmin G3X-T, Barrett EFII S32, CAI, MTV-9B

Dues+ Paid 2021,...Thanks DR+
Reply With Quote
  #9  
Old 07-17-2022, 02:41 PM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,361
Default

Oil - I did a hammerhead in my buddy's 6A with a carburetted engine. being used to fuel injection, I just enjoy it's upline.

Then the engine stopped.

Doh !

Pushed forward to stop it going over onto it's back and wondered what the mist was.......

The whole lower wing surface was covered in oil from root to tip.

Hey Ho - the ramp lads earned their $50 that afternoon cleaning it
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2022
Reply With Quote
  #10  
Old 07-17-2022, 03:46 PM
MacCool's Avatar
MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
Posts: 1,178
Default

Quote:
Originally Posted by nohoflyer View Post
Chemtrails silly. Didn’t you know vans sneaks them into every build?!
Dude! The first rule of Chemtrails is that no one talks about Chemtrails….
__________________
RV-9A, 2011, bought flying
IO-320D1A (factory new), C/S
IFR equipped
AFS 5400/3500, G5, IFD440 navigator,
bunch of other stuff
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:55 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.