'G' ratings for 3D mounouvres.  
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All Forums >> RC Airplanes >> 3D Flying! >> 'G' ratings for 3D mounouvres.
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'G' ratings for 3D mounouvres. - 11/22/2003 7:26:25 AM   
Chris-B-chips



Posts: 559
Joined: 3/29/2003
From: Brisbane, AUSTRALIA
Status: offline 		hey guys can you give me some idea of the 'G' ratings of some of the 3D mounouvres as i have a seduction wildstyle and i don't have a lot of faith in the strength of the wings.
       Post #: 1

RE: 'G' ratings for 3D mounouvres. - 11/22/2003 7:32:46 AM   
Darrinc



Posts: 1028
Joined: 1/22/2002
From: Piqua, OH, USA
Status: offline 		I would kill for some real answers here also. I doubt if we get a real anwser.

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(in reply to Chris-B-chips)
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RE: 'G' ratings for 3D mounouvres. - 11/22/2003 7:58:38 AM   
wheels


 

Posts: 133
Joined: 1/26/2003
From: Edmonton, AB, CANADA
Status: offline 		just my thought, and I may be wrong but other than a "wall" or "parachute" I'd think the wing loading in most of the 3d moves is pretty low. After all for the most part, the wing is stalled, most if not all of the aircraft is being supported by engine power.

(in reply to Darrinc)
       Post #: 3

RE: 'G' ratings for 3D mounouvres. - 11/22/2003 8:15:01 AM   
Flyfalcons



Posts: 6129
Joined: 7/27/2002
From: Bonney Lake, WA, USA
Status: offline 		I've tried to get my avionics shop buddy to bring out a G meter to strap into my plane, but no luck yet. My guess is that for all the low speed stuff it would be tough to impose more than 5 Gs on the plane, no matter how wild the maneuver looks. Walls, parachutes, hard blenders might stress the airframe more if flown at higher speeds. Anyway I'll try again to borrow a G meter for a flight or two.

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(in reply to wheels)
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RE: 'G' ratings for 3D mounouvres. - 11/22/2003 8:22:25 AM   
Chris-B-chips



Posts: 559
Joined: 3/29/2003
From: Brisbane, AUSTRALIA
Status: offline 		thanks flyfalcon please try and get the meter and post the results.

(in reply to Flyfalcons)
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RE: 'G' ratings for 3D mounouvres. - 11/22/2003 11:47:51 PM   
Luke 3D returns



Posts: 1724
Joined: 7/2/2003
From: london, UNITED KINGDOM
Status: offline 		Low speed would produce much more than 5gs i think, unless i am very much mistaken. Even if you are going at slow speed you can make an r/c plane change direction very quickly, and once you have done aerobatics in the full size you realise just how much force a plane goes through, and that is doing big, smooth manuvers at a much slower scale speed.
I wouldn't be suprised if you got G ratings of at least 6 during 3d manuvers for model aircraft, and much more during blenders and walls. Will Curtis does 12g walls with his full size Sukhoi.
It will be interesting to see the results from your g-meter.

(in reply to Chris-B-chips)
       Post #: 6

RE: 'G' ratings for 3D mounouvres. - 11/23/2003 3:11:05 AM   
BeauMiller



Posts: 151
Joined: 9/21/2002
From: Kaysville, UT, USA
Status: offline 		Acceleration Units (G's) are a measurement of the force of gravity. The equation is a = velocity squared/ turn radius. The amount of G's your plane can pull is directly dependent upon the velocity and turn radius. Slow speeds will yield lower g forces. With that said, some aircraft can pull more G's at slower speeds than others due to wing area and control surface size. Thrust is also a factor in being able to maintain the velocity.

My T-37 trainer for instance, has the highest G-onset rate of any aircraft in the Air Force inventory. But it cannot maintain the G for very long due to a lack of thrust to maintain airspeed. The F-16 on the other hand can easily maintain 9 g's because it has excess thrust. Which means it can stay fast.

I am not a mathematician, so I am sure somebody can poke holes in what I said. Here is where I got the information from:
http://www.usafa.af.mil/dfp/cockpit-phys/cp_pg0.htm
http://www.usafa.af.mil/dfp/cockpit-phys/pg2ap1c.htm

To me it seems that most of the typical 3D maneuvers would be of the low G variety. The plane might be maneuving quite violently, but it is also moving quite slowly. Max "G" available will always occur with the lift vector pointed straight out the top/bottom of the wing at the highest speed possible.

Just my thoughts....
Beau

< Message edited by beaumiller -- 11/23/2003 3:21:48 AM >

(in reply to Luke 3D returns)
       Post #: 7

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