Ultimate 40 CG..??  
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Ultimate 40 CG..?? - 1/1/2008 5:12:20 AM   
rockitboy


 

Posts: 22
Joined: 12/18/2006
From: aberdeen, SD, USA
Status: offline 		The manual says 120mm from the LE. Is this the bottom wing? Is the plane balanced inverted? I havent balanced a bibe b4 & the manual isnt very clear on how to do this.
       Post #: 1

RE: Ultimate 40 CG..?? - 1/1/2008 5:25:50 AM   
opjose



Posts: 5472
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		I have mine set about 1 inch back from the TOP front wing bolt/screw. Just ever so slightly aft of the thickest part of the wing center.

Of course that is with an empty tank, and it will fly with the C.G. at least .75" further back.

I just like it at this point as it makes it easy to grease landings.



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RE: Ultimate 40 CG..?? - 1/1/2008 5:27:51 AM   
lrglnman


 

Posts: 337
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		On my seagull 120 ultimate you ballance on the top wing right side up. should be the same way with yours. measure back where the wings join together (on the upper wing) at your recommended cg . thats how I did mine.

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James Smith

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RE: Ultimate 40 CG..?? - 1/1/2008 5:29:30 AM   
rockitboy


 

Posts: 22
Joined: 12/18/2006
From: aberdeen, SD, USA
Status: offline 		Mind me askin what motor your running? Any tips b4 i maiden her?

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       Post #: 4

RE: Ultimate 40 CG..?? - 1/1/2008 7:32:36 PM   
opjose



Posts: 5472
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		I have four of these planes.

I've primarily run them with Tower Hobbies .46 engines, pitts mufflers and dubro anti-vibration mounts. This gives it gobs of power.

DO NOT use the included tail gear.

Order a handful of these instead.

CLICK ME!

Gotta love the price!

Then angle the tail gear once installed so the plane sits more level.

It will tend to yaw quite hard, and making it sit level will help a lot.

When you trim it out before the first fligth you want it to roll slightly to the right with the controls centered to help deal with the left yaw at runup.

It can take standard servos all around.



I use the above ( white version ) filler to fill the plane with the cowl on, and it's very nice in that you can pinch test the engine with the cowl in place.

It can be purchased here: CLICK ME!

Do not fly it with the wheel pants on for the first few flights... you may want to try oversized foamy wheels which will permit you to land it in the grass as well.

I'd also recommend hitting the covering with an iron before you start the engine the first time and hitting the entire plane ( not the clear plastic ) with Top Flite clear coat spray to seal the seams. This will prevent the fuel from attacking the trim adhesive.



< Message edited by opjose -- 1/1/2008 7:36:00 PM >

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Build em'', fly em'', crash em'' and build more.

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RE: Ultimate 40 CG..?? - 1/1/2008 10:22:57 PM   
rockitboy


 

Posts: 22
Joined: 12/18/2006
From: aberdeen, SD, USA
Status: offline 		Sounds like some good advice, thanks! Got the bird built for the most part, just need to get that CG right. I'll give you a rundown of my goodies; Saito 82 mounted inverted, Slimline pitts smoker, Apc 13x8 prop, Truturn 2-1\4" Ultimate alum. spinner, Sullivan skywriter & 8 oz smoke tank. Useing a 2 cell 1200 mah lipo for the smoker and a 6 volt Nimh 1100 mah for the rx. Hitec hs425s on the ailerons and Jr ds811s on the tail. Remote fuel, smoke & charge jacks are located on the fuse under the top wing along with a voltwatch. No, i havent weighed it yet! Im thinking it should be about 5.5 lbs dry if i dont have to add too much tail weight.

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RE: Ultimate 40 CG..?? - 1/2/2008 12:02:42 AM   
opjose



Posts: 5472
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		I'd be surprised if it comes in that light with the smoke system.

However it will fly just fine at 6+ lbs, just a little hotter when it lands.



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Build em'', fly em'', crash em'' and build more.

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RE: Ultimate 40 CG..?? - 1/2/2008 12:29:58 AM   
rockitboy


 

Posts: 22
Joined: 12/18/2006
From: aberdeen, SD, USA
Status: offline 		I have the batteries behind the wing and the servoes in in the tail so im really hopeing 4 under 6lbs. But like u say if its heavier it"ll just land hotter... Cool, thanks for your help.

(in reply to opjose)
       Post #: 8

RE: Ultimate 40 CG..?? - 1/2/2008 3:10:50 AM   
opjose



Posts: 5472
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		Good luck, it's a fun plane... it will not hover though....

Try to get as much throw out of the ailerons as you can.

Dial the movement down with the radio.

I found the default setup far to docile for my tastes.

Also I put small wedges of triangular balsa against the wing struts to beef them up. Set up so the wings are still removable, and then painted white.

I did this after ripping the wing strut off one day... ( granted I cartwheeled the plane accross the field, then immediately flew it again, and started performing hard snap rolls. ).... much to the amazement of other club members who then wanted to know, just who manufactured such a sturdy plane...



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Build em'', fly em'', crash em'' and build more.

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       Post #: 9

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