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FYI G rating on Firefly

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nickc(at)mtaonline.net
Guest

Posted: Sat May 07, 2016 4:23 pm Post subject: FYI G rating on Firefly

Kolbers,



I have a “the New Kolb Aircraft, Co.” catalog that says +4 -2g for the Firefly and all the other have the same number.



Fly safe,



Nick Cassara

Palmer, Ak

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victorbravo(at)sbcglobal.
Guest

Posted: Sun May 08, 2016 12:14 am Post subject: FYI G rating on Firefly

In keeping with a very long and well-understood tradition in aircraft design and manufacture, there is an additional 50% FOS, or "factor of safety". This means that the airplane was likely tested to +6G



Bill Berle

www.ezflaphandle.com  - safety & performance upgrade for light aircraft

www.grantstar.net           - winning proposals for non-profit and for-profit entities



--------------------------------------------

On Sat, 5/7/16, Nick Cassara <nickc(at)mtaonline.net> wrote:



 Subject: FYI G rating on Firefly

 To: kolb-list(at)matronics.com

 Date: Saturday, May 7, 2016, 5:22 PM

 

 

 Nick Cassara <nickc(at)mtaonline.net>

 

 Kolbers,

 

 I have a “the New Kolb Aircraft, Co.” catalog that says

 +4 -2g for the Firefly and all the other have the same

 number.

 

 Fly safe,

 

 Nick Cassara

 Palmer, Ak

 

 

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ceengland7(at)gmail.com
Guest

Posted: Sun May 08, 2016 2:59 pm Post subject: FYI G rating on Firefly

Hmmm... I wouldn't want to assume that's true. Might be, but only Homer 

(or a structures engineer) knows for sure.  Many non-certificated a/c 

are not designed to Part 23 (or its CAA predecessor)  standards. And 

designing for is not the same as 'having'.   And you must factor in 

changes that builders may make, either by accident, or to make the 

design stronger. 



The prototype of the plane I fly *was* tested to 6Gs, and I try not to 

go beyond 4 in mine (so *I* have a 50% margin). In the design that I 

fly, going beyond about 6.5-7Gs will often get you permanently bent 

metal. Going much beyond 9 (50% margin) can get you broken metal (killed).



My real point is that even if it was tested to 50% beyond rated G load, 

the margin is there so you have a margin. If you use it, you don't have 

it when you slip up & pull an extra .5.



Charlie



On 5/8/2016 3:11 AM, Bill Berle wrote:

 	  Quote: 	
		   



 In keeping with a very long and well-understood tradition in aircraft design and manufacture, there is an additional 50% FOS, or "factor of safety". This means that the airplane was likely tested to +6G



 Bill Berle

 www.ezflaphandle.com  - safety & performance upgrade for light aircraft

 www.grantstar.net           - winning proposals for non-profit and for-profit entities



 --------------------------------------------

 On Sat, 5/7/16, Nick Cassara <nickc(at)mtaonline.net> wrote:



   Subject: FYI G rating on Firefly

   To: kolb-list(at)matronics.com

   Date: Saturday, May 7, 2016, 5:22 PM

   

   

   Nick Cassara <nickc(at)mtaonline.net>

   

   Kolbers,

   

   I have a “the New Kolb Aircraft, Co.” catalog that says

   +4 -2g for the Firefly and all the other have the same

   number.

   

   Fly safe,

   

   Nick Cassara

   Palmer, Ak

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun May 08, 2016 3:58 pm Post subject: FYI G rating on Firefly

Hmmm... I wouldn't want to assume that's true. Might be, but only Homer (or a structures engineer) knows for sure.  Many non-certificated a/c are not designed to Part 23 (or its CAA predecessor)  standards. And designing for is not the same as 'having'.   And you must factor in changes that builders may make, either by accident, or to make the design stronger. 



 

Charlie



 



Kolbers:



I have flown with a G Meter since my Firestar days.  Have always had a G Meter in the MKIII.  I like to know what I am doing to the airplane.



Back in my Firestar days I thought the Kolb design was invincible.  Therefore, I did thousands of aerobatics in a heavy Firestar before I finally wore it out.  I can share with you that it is extremely difficult to exceed the G rating of 4+/2- on a Kolb.  The most I was ever able to pull on the Firestar was 5+ and between 1 and 2 minus.  To get 5 G's, I had to work extremely hard.  I doubt the average guy could pull more than 4+ in a Kolb.  Don't worry.  If you accidentally do pull 5+, the wings won't come off.  Now if you fly like that for 785.0 hours, there's a good chance you will have a catastrophic failure.



I have never performed aerobatics in my MKIII.  I have seen 4+ and 2- in some of the extreme weather I have found myself at times.  Normally, really rough air will see 2+ and 1-.



Your Kolb is not going to break unless you really work hard at doing just that.



john h

mkIII

Titus, Alabama

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

victorbravo(at)sbcglobal.
Guest

Posted: Sun May 08, 2016 4:18 pm Post subject: FYI G rating on Firefly

Absolutely 100% correct, the reason for a safety margin is to have it and never use it. 



Bill Berle

www.ezflaphandle.com  - safety & performance upgrade for light aircraft

www.grantstar.net           - winning proposals for non-profit and for-profit entities

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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