VansAirForceForums  
Home > VansAirForceForums

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

Keep VAF Going
w/a Donation






VAF on Twitter:
@VansAirForceNet

  #21  
Old 05-14-2021, 04:33 PM
bifft bifft is offline
 
Join Date: Feb 2012
Location: Utah
Posts: 142
Default

Quote:
Originally Posted by Sparrowhwk View Post
Paul,
Is there more than one jettison system being employed on RV-8's??
I put vertical cuts in my canopy rails about three inches back from the front. If I'm pushing up on the canopy as it passes that spot it easily comes out and up. (When practicing on the ground anyway, haven't tried in flight). Don't remember who I copied this method from.

The only person to get out of an RV-8 in flight (sadly without a parachute) did use the removable pins method.

Regarding what parachute to use, I have a butler seat pack. Even with the tall pilot option I barely have enough leg room, but have plenty of head room (6'4"). Use it with no cushions at all. Wear it every flight I'm not carrying a passenger (seems rude for me to have a chute, but not one for the person in back).
Reply With Quote
  #22  
Old 05-15-2021, 07:48 AM
Lt Dan Lt Dan is offline
 
Join Date: Dec 2014
Location: Utah
Posts: 108
Default

Very interesting. Does anyone have a picture of these removable pins?
__________________
08 RV-4 (sold)
09 RV-8
Reply With Quote
  #23  
Old 07-11-2023, 08:34 PM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: KAJO
Posts: 1,113
Default Old Thread: New Picture

I created this canopy jettison mechanism so that I could easily slide the canopy past the fiberglass trim and jettison it. Basically it is a ratchet strap device I bought from HomeDepot. The handle design reminds me of the 5point ratchet handle on aerobatic airplane that I can firm wrap my hand and ratchet the canopy rearward. The long strap was trimmed down to about 4 feet. This strap is rated at 500 lbs and I think it is more than sufficient to pop the canopy up the sliding block and rearward, and counteract against the aerodynamic force. The quick release seen in the picture should allow me to punch the canopy clear into the airstream.

Talking to a local RV8 pilot who regularly flies formation, he said he was able to manually slide the canopy rearward when he flies less than 125mph so perhaps this is overkill. But this contraption is simple, and it weights only about 2 lbs

I have been thinking of how to slide the RV8 canopy rearward and this is my idea.
Attached Thumbnails
Click image for larger version

Name:	IMG_0404.jpg
Views:	69
Size:	518.6 KB
ID:	45149  
__________________
RV8 (N38PV)
Days to First Flight: 999
Reply With Quote
  #24  
Old 07-11-2023, 11:56 PM
donaziza's Avatar
donaziza donaziza is offline
 
Join Date: Jun 2007
Location: Atlanta
Posts: 932
Default

Quote:
Originally Posted by PhatRV View Post
I created this canopy jettison mechanism so that I could easily slide the canopy past the fiberglass trim and jettison it. Basically it is a ratchet strap device I bought from HomeDepot. The handle design reminds me of the 5point ratchet handle on aerobatic airplane that I can firm wrap my hand and ratchet the canopy rearward. The long strap was trimmed down to about 4 feet. This strap is rated at 500 lbs and I think it is more than sufficient to pop the canopy up the sliding block and rearward, and counteract against the aerodynamic force. The quick release seen in the picture should allow me to punch the canopy clear into the airstream.

Talking to a local RV8 pilot who regularly flies formation, he said he was able to manually slide the canopy rearward when he flies less than 125mph so perhaps this is overkill. But this contraption is simple, and it weights only about 2 lbs

I have been thinking of how to slide the RV8 canopy rearward and this is my idea.
I've got an 8, and I'm trying to picture how this works. Please don't think me rude, but it ?looks? like you pull on the rachet handle--the strap goes around a pully, or something, and then up to the hook pulling the canopy aft. But then the canopy would be flailing in the air still attached to these hooks. I'm not seeing this correctly, right?? Can you do a bigger picture??
Reply With Quote
  #25  
Old 07-12-2023, 07:27 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: KAJO
Posts: 1,113
Default

The strap goes around the mid roll bar. The thought of the canopy flailing in with the strap did cross my mind but when I do punch out, not able to get the canopy sliding off to punch out is a greater concern for me. I hope the open hook will get detached from the frame but I try not to over think this. BTW, I plan to wear a helmet.
__________________
RV8 (N38PV)
Days to First Flight: 999
Reply With Quote
  #26  
Old 07-12-2023, 08:28 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 5,377
Default

Quote:
Originally Posted by PhatRV View Post
... not able to get the canopy sliding off to punch out is a greater concern for me. ...
I never considered that I would not be able to open the canopy. Since there has been at least one guy that got it open, I had assumed that I could too, if needed.
__________________
Mickey Coggins

http://www.rv8.ch/help-people-in-ukraine/
Reply With Quote
  #27  
Old 07-12-2023, 09:24 AM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,983
Default

Quote:
Originally Posted by bifft View Post
(seems rude for me to have a chute, but not one for the person in back).
I just tell them that if something happens, I'll go for help....

Regarding canopy opening, I think the lift on the 8 canopy is much less than the side-by-side sliders. I think you could pull it back enough to clear the windscreen fairing.
__________________
Mike W
Venice, FL

N164WM RV-6A Slider/O-360/FP Sold 4/2022
N184WM (RV-8) Flying. Titan IOX-370/ CS/G3X. 2023 SnF Outstanding Workmanship award
N184P reserved (RV-8QB) Empennage kit, QB wings, QB fuselage, finish kit, and engine in the shop
Reply With Quote
  #28  
Old 07-12-2023, 02:35 PM
claycookiemonster's Avatar
claycookiemonster claycookiemonster is offline
 
Join Date: Oct 2007
Location: Midway, UT
Posts: 644
Default What about a Fastback -8?

What experience or prediction does anyone have with a tip over -8 canopy as far as opening it in flight goes?
I guess the challenge of rolling the aft portion backwards is gone, and once the canopy is opened a bit, it may WHOOSH away asymetrically? If the canopy produces lift, that lift will be up and to the starboard side of things. So it is likely to hit the VS and I will not have a safe space behind a forward windscreen to consider my next move. Have I got it about right? I'm not sure how the mid-cockpit roll bar will affect this.
__________________
Clay "Cookiemonster" Cook
USAF: T-38, F-111F
American Airlines: 727, MD80, 757, 767, 737
RV8 #81751 project sold
RV8 #81651 project acquired
https://theonceandfutureflyer.wordpress.com/
Donations up to date thru December 2022

"...serenity...courage...and wisdom..."
Reply With Quote
  #29  
Old 07-12-2023, 02:40 PM
RV8JD's Avatar
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 1,088
Default

Quote:
Originally Posted by Lt Dan View Post
Very interesting. Does anyone have a picture of these removable pins?
For those who haven't seen them before:

No changes to the bolt hole. Just replace the bolts with pip pins. Attach a short lanyard to pull them out in an emergency. Here is the one from McMaster-Carr:
https://www.mcmaster.com/92384A013/

Pip pin installed in my previous RV-8:

As others have mentioned, in 1999 there was an RV-8 that caught fire in flight. The pilot did get out, but unfortunately he was not wearing a chute. The NTSB said that the fire may have been so intense in the cockpit to be intolerable (the WWI scenario before chutes were widely used). Here is the NTSB Final Report.
https://app.ntsb.gov/pdfgenerator/Re...=HTML&IType=FA

Another thread on the subject of opening the RV-8 canopy (probably a better location for the last several posts): https://vansairforce.net/community/s...d.php?t=211972
__________________
Carl N.
RV-8
KAWO

Last edited by RV8JD : 07-12-2023 at 04:12 PM.
Reply With Quote
  #30  
Old 07-13-2023, 10:08 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: KAJO
Posts: 1,113
Default

Quote:
Originally Posted by rv8ch View Post
I never considered that I would not be able to open the canopy. Since there has been at least one guy that got it open, I had assumed that I could too, if needed.
A local RV8 pilot confirmed he could open the canopy at 125mph and lower, but other pilots have stated that it is not possible to do at greater than 150mph. I've seen one private video that at moderate speed, the canopy will move forward a bit due to the positive air pressure at the back of the canopy. At this speed, the test pilot confirmed the canopy could not be opened. This ratchet is a piece of mind for me, just like wearing a parachute.
__________________
RV8 (N38PV)
Days to First Flight: 999
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 03:08 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.