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  #1  
Old 11-02-2018, 10:05 AM
Camillo Camillo is offline
 
Join Date: Sep 2006
Location: Roma, Italy
Posts: 499
Default Roll bar and minimum head clearance

Hallo.
I was wondering what the minimum suggested clearance would be from head and roll bar in case of a flip over.
I have 2-1/2'' on my -4. It seems to me OK and visibility is OK, too. May I reduce safely the gap with a higher seat?
Thanks.
Camillo
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  #2  
Old 11-09-2018, 08:43 PM
simpkinsona simpkinsona is offline
 
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 132
Default Seat belt

I donít have an answer for you about suggested clearance, but in my opinion, having a crotch strap is much more important than the head clearance. A four point seat will not hold you firmly against the seat in a roll over.

-Andy
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RV-9a Subaru engine.
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  #3  
Old 11-10-2018, 11:34 AM
SMRacer SMRacer is offline
 
Join Date: Feb 2012
Location: Leesburg, VA
Posts: 398
Default Racing roll bars

Sports Car Club of America (SCCA) requires a 2 inch clearance between the top of the helmet and the top of the roll bar for race cars. Remember this is a situation where the driver has a helmet.
I am a firm believer that the more extensive harness systems are more secure. The sub belt, however, is not intended to prevent you from rising off the seat.
https://www.wescoperformance.com/cro...rine-expl.html
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Leesburg, VA
RV4 N444JT (sold)
RV8 N37PK

Last edited by SMRacer : 11-10-2018 at 11:43 AM.
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  #4  
Old 11-10-2018, 12:19 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,803
Default

Quote:
Originally Posted by SMRacer View Post
The sub belt, however, is not intended to prevent you from rising off the seat.
I agree that it is not the primary purpose but it does help a lot.

The belt system performance while flying through moderate to heavy turbulence between crotch belt on (and properly adjusted) and crotch belt off is very noticeable.
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Any opinions expressed in this message are my own and not necessarily those of my employer.

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Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #5  
Old 11-10-2018, 01:28 PM
SMRacer SMRacer is offline
 
Join Date: Feb 2012
Location: Leesburg, VA
Posts: 398
Default Pull 'em tight

Been around here long enough to know NOT to argue with Scott.

Just remember, we build some comfort into the seats in our airplane. That comfort leads to compression of the seat components. You are more safe with the belts properly fastened/adjusted, and TIGHT. So pull them snug just before TO and continue tightening throughout the flight.
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Leesburg, VA
RV4 N444JT (sold)
RV8 N37PK
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