A question on the Four Star 120 cg.  
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A question on the Four Star 120 cg. - 5/14/2008 5:46:51 AM   
Bigshark


 

Posts: 116
Joined: 12/1/2004
From: St. Louis, MO, USA
Status: offline 		I'm just finishing up a Sig four star 120 and sans the canopy, pilot, and any fuel residue the ship balances a tiny bit aft of the 4.5 inches from the leading egde which is recommended as the maximum rearward position for the center of gravity. To all the four star flyers out there, how sensitive is this bird when a bit tail heavy?


I should point out I'm a decently skilled flyer having progressed from a slow stick to electric sailplanes to a senior telemaster and now the fourstar. I tend to like my sail planes a bit tail heavy (or to the rearward limit) to help slow them down for thermal seeking.

This bird is powered by a st G2300 which should supply more than enough power for my flying style.


Any Thoughts?

Thanks,
Rich


_____________________________

All attempts at artificial aviation are doomed to failure from an engineering standpoint.
1905 Editor Times of London
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RE: A question on the Four Star 120 cg. - 5/14/2008 5:56:43 AM   
Campgems


 

Posts: 1801
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		I've flown two 4*60's. My suggestion is to not go tail heavy, but a tad nose heavy. This series of planes float something awful on landing. You end up with some really slow speed and you wouldn't want it dropping a tail at that point. Balance it per the instructions and you'll be happy. Error on nose heavy.

Don

(in reply to Bigshark)
       Post #: 2

RE: A question on the Four Star 120 cg. - 5/14/2008 1:35:15 PM   
outdoorhunting


 

Posts: 445
Joined: 9/22/2006
From: Kokomo, IN, USA
Status: offline 		Bigshark Campgems is right !!!! Definitley go a little nose heavy. I've also had two 4*s & they WILL float on landing. I've actually floated a 4* 60 (in the same place) in a 15 knot head wind while idling the motor.There are not too many birds that you can do that with !! "Dumb thumbs ended both before their time. I WILL be getting another. The 4* makes for the most relaxed flying you can do!!

(in reply to Bigshark)
       Post #: 3

RE: A question on the Four Star 120 cg. - 5/14/2008 3:26:21 PM   
Bigshark


 

Posts: 116
Joined: 12/1/2004
From: St. Louis, MO, USA
Status: offline 		Thanks for the replys. I'll have to try to move the battery around and do without a pilot. I hate having to add dead weight to a bird. I figured with the 140 sized motor, a cowl, and big spinner, I'd be ok.........

_____________________________

All attempts at artificial aviation are doomed to failure from an engineering standpoint.
1905 Editor Times of London

(in reply to outdoorhunting)
       Post #: 4

RE: A question on the Four Star 120 cg. - 5/16/2008 7:10:43 PM   
Jim Dines


 

Posts: 1344
Joined: 2/27/2002
From: Keller, TX, USA
Status: offline 		Deleted by poster (misread part of the original post).

(in reply to Bigshark)
       Post #: 5

RE: A question on the Four Star 120 cg. - 5/17/2008 12:26:36 AM   
Campgems


 

Posts: 1801
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		BigShark, look at your choice of props also from a weight standpoint. I was balancing out a model the other day and I had two 13x4 props in hand, an APC 14x4W and Zinger 14x4 square tip. The APC was ove 1/2 Oz heaver than the Zinger. I had planed to use the APC anyway, but balanced with the Zinger for safety sake incase I needed to use it later.

Just something to keep in mind. A 1/2 oz is a lot at the end of the motor.

Don

(in reply to Bigshark)
       Post #: 6

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