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Align T-REX 600N 700N > T-REX 700N TREX 700 - C of G way out!!
 
 
Wimbledon99
Senior Heliman
Location: UK

My Posts This: Topic  Forum		Hi All,

I need to add 100g to my tail in order to acheive a balanced C of G. Is this excessive

Thought I'd post the 'front end' pics in case anyone could offer any (polite) suggestions



I don't know how else to jig this around

Cheers

P.S Am using a v2 canopy too.

3D?? No - just another input error!!!
11-04-2009 11:54 AM
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Yogi 1
Senior Heliman
Location: Clinton,CT USA

My Posts This: Topic  Forum		Dont see anything out of the ordinary there, do not add weight to the tail a little nose heavy is good on a heli and it will fly foward better and not effect the hover at all.Yogi

Velocity Is A State Of Grace Get Some Now !
11-04-2009 01:09 PM
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jschenck
Elite Veteran
Location: La Vista, NE.

My Posts This: Topic  Forum		you do want the heli balanced otherwise the trim you have setup for right side up hover will push you forward when you are upside down.

Are there two batteries up front? Can you move one of those to the rear, say on top of the tail transmission?

polite suggestion - a little <more> spiral wrap and some velcro strips - actually some of those wires are close to the CF frame members and may cut through the wires.

.. P-gas, T700, V50c/u, R50T, T4/250 and a Cricket ..
11-04-2009 01:20 PM
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RRios
Senior Heliman
Location: Orlando, Florida United States

My Posts This: Topic  Forum		where is the CG supposed to be? Directly down the main shaft?
11-04-2009 01:28 PM
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DWS6
Key Veteran
Location: Newark,DE

My Posts This: Topic  Forum		Turn the heli knife edge and hold the grips so the blades are up and down (perpendicular to the floor) to let the heli pivot around the main shaft.

Dave Williams
Team HeliWholesaler
11-04-2009 02:42 PM
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jschenck
Elite Veteran
Location: La Vista, NE.

My Posts This: Topic  Forum		yes - quick way to check is to pop the links off the main blade grips and pick up the heli by the grips with them sticking straight out to the sides. You can also check by picking it up by the flybar (near the root) just be careful not to bend it. heli should stay level

EDIT: DWS6 method is best.

.. P-gas, T700, V50c/u, R50T, T4/250 and a Cricket ..
11-04-2009 02:43 PM
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Wimbledon99
Senior Heliman
Location: UK

My Posts This: Topic  Forum
Quote 
You can also check by picking it up by the flybar

What's a Flybar??

Seriously though, Thanks for the replies so far. I would normally be happy with a little nose heavy but I run a Mikado vBar and whilst it flies OK, I understand performance will improve with the C of G being spot on.

The wires are 'bare' as I have been moving everything around. Need to tidy them up once good balance is achieved.

Keep the comments coming

Cheers

3D?? No - just another input error!!!
11-04-2009 03:59 PM
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jschenck
Elite Veteran
Location: La Vista, NE.

My Posts This: Topic  Forum		Are you checking CG with the canopy on and 1/2 tank of fuel?

.. P-gas, T700, V50c/u, R50T, T4/250 and a Cricket ..
11-04-2009 04:11 PM
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Wimbledon99
Senior Heliman
Location: UK

My Posts This: Topic  Forum
Quote 
Are you checking CG with the canopy on and 1/2 tank of fuel?

I am indeed

Just wondered if 100g was unusual?

3D?? No - just another input error!!!
11-04-2009 04:19 PM
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woodster
Senior Heliman
Location: uk,cheshire

My Posts This: Topic  Forum		How about change the battery them mission cells are heavy.
11-04-2009 05:10 PM
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DWS6
Key Veteran
Location: Newark,DE

My Posts This: Topic  Forum		Checking it knife edge is the most accurate way to do it. I do this before I add a battery which makes it tail heavy. I add weight to the nose where the battery mounts and then buy a battery as close to that weight as possible. You can usually move the weight around under the electronics tray to get the best CG. Im my opinion, 100g is a lot on the tail as that is very far back on the heli when leverage is factored in.

Dave Williams
Team HeliWholesaler
11-04-2009 05:13 PM
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oysifly
Veteran
Location: Bentonville, AR

My Posts This: Topic  Forum		also, On my 700 FBL I found that mounting the sensor for the Vbar actually worked better using two pieces of foam tape with a metal plate rather then just that one piece that you have. Fly it and see how it works for you and if you have issues, remount your sensor.

Quick...here comes my wife....hide that new Heli !!!!
11-04-2009 05:14 PM
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Wimbledon99
Senior Heliman
Location: UK

My Posts This: Topic  Forum		No issues with the FBL at present - flies like a Pattern Ship. Just thought I'd do as the instructions ask re. the C of G.

I did however need thicker tape on my 50. The supplied tape was no good and the heli was all over the place

3D?? No - just another input error!!!
11-04-2009 06:56 PM
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mont_blanc
Senior Heliman
Location: UK

My Posts This: Topic  Forum		You've got a Header tank I notice, with this full and the main tank half full it should add about 100g or so to the back end.

fly a rubber heli - it's cheaper!
11-04-2009 10:52 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum		C of G
I always check mine but I think 90% just build and fly but now I’ve said that every one will say they do check first

I only like to fly gassed up
11-04-2009 11:13 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum		Another way of shifting some weight to the rear would be to mount the tail servo on the boom

I only like to fly gassed up
11-04-2009 11:17 PM
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Jesse Kavros
Senior Heliman
Location: San Jose, California

My Posts This: Topic  Forum		Hey Wimbledon99,

Here is the way I wired mine. Not the greatest.

11-05-2009 01:22 AM
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4cyclic
Veteran
Location: Montreal, Can. and northern Vt

My Posts This: Topic  Forum		Yes you should move the pack back or use lighter lipo pack. The vbar will react better if cg neutral at half tank. I had to move my lipo closer to the main shaft to achieve proper cg.

Fly non-stop till your brain fizzles !
11-05-2009 01:47 AM
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Gernejr
Heliman
Location: Miami, Fl

My Posts This: Topic  Forum		My suggestions comes with a cost . Skeptrum 7100R on RR 150.oo. then sale your Reg. 50.oo Rx 100.oo Gov. 80.oo hey now your up 80.oo and your wire will be alot easier and cleaner. Wait i didn't look at your cyclic sevros but Perfect Reg. mades a reg thats small light and only 50.00 still up 30.oo for a gal of fuel... bet you will need to remove the header tank then... Just a thought...
11-05-2009 03:02 AM
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Against Gravity
Senior Heliman
Location: Pottstown PA

My Posts This: Topic  Forum		123 pack

Get the new Hyperion life pack. then get rid of your regulator, voltage will be fine and you can charge it very quickly.
Mount it on the bottom where your Reg is now. You can slide it further back to help your CG.
11-05-2009 03:03 PM
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Align T-REX 600N 700N > T-REX 700N TREX 700 - C of G way out!!
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