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Old 04-16-2012, 07:53 AM   #1 (permalink)
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Default Tail heavy heli

After adding an AR800, TM1000, sat RX, and a Copilot system my bird is a little tail heavy. I tried moving my battery more forward, but I won't be able to get the canopy on if I move it any lower and the heli is still tail heavy. I can not move the components any closer to the main shaft as there just isn't room for it there. What would you recommend to fix the COG?
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Old 04-16-2012, 07:59 AM   #2 (permalink)
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Hate to say it, but once you've tried moving stuff round, and can't get it right, the only thing left to do is ballast it. I have a AA cell taped to the front left side of my frame. Heavy tail servo. I think some guys tape stuff to their lipos too.
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Old 04-16-2012, 08:18 AM   #3 (permalink)
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I use the stick on lead weights when needed to get cg right
This is a 6 oz set , each of the 24 segments is about 7 grams
http://www.horizonhobby.com/products...t-6-oz-HAN3626

One other thing i did is i went with the TM1100 instead of the TM1000 on my 450
its 1/3 the weight and less than 1/2 as long

TM1100 Weight: 5.4g Dimensions (WxLxH): 25.8x20x10.8mm
TM1000 Weight: 15.8g Dimensions (WxLxH): 30.0x43.0x13.0mm
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Old 04-16-2012, 08:39 AM   #4 (permalink)
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+1 on the lead weights, I have 10, 7-gram lead weights on the nose of the frame. You do the math
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Old 04-16-2012, 09:46 AM   #5 (permalink)
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Those weights look like they'll do the trick
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Old 04-16-2012, 10:17 AM   #6 (permalink)
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I placed tungsten plates (denser than lead I believe) for wood cars onto the frame on the front of my heli. Works like a charm.

Alternatively If you use different types of batteries that have different weights, you can weight the batteries.

Last edited by grovey; 04-16-2012 at 11:33 AM..
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Old 04-16-2012, 11:17 AM   #7 (permalink)
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The lead weights work for sure, I have a couple. You might be able to use fewer of them (cut down on the total weight added) by sticking them into the nose of the canopy.

Are you sure you can't move the ESC forward? It is one of the heavier components, and there should be plenty of room. I was able to fix most my COG problems just by doing that.
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Old 04-16-2012, 11:27 AM   #8 (permalink)
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Quote:
Originally Posted by buddha2490 View Post
The lead weights work for sure, I have a couple. You might be able to use fewer of them (cut down on the total weight added) by sticking them into the nose of the canopy.

Are you sure you can't move the ESC forward? It is one of the heavier components, and there should be plenty of room. I was able to fix most my COG problems just by doing that.
I can try. There is room. I just have to get it off the double sided tape first if that doesn't do it, then I'll add the weights. I have to go the LHS today anyway, so I'll pick up some weights just in case.
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Old 04-16-2012, 11:57 AM   #9 (permalink)
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Quote:
Originally Posted by gtrsteele View Post
I can try. There is room. I just have to get it off the double sided tape first if that doesn't do it, then I'll add the weights. I have to go the LHS today anyway, so I'll pick up some weights just in case.
At some point during my earliest rebuilds I replaced all the double sided tape in the heli with velcro, so I could move stuff around easier. And I still attach everything else (weights and such) with velcro. Makes for easy access, removal, and repositioning.

I kept the double sided tape on the gyro, but everything else.
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Old 04-16-2012, 12:01 PM   #10 (permalink)
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Quote:
Originally Posted by buddha2490 View Post
At some point during my earliest rebuilds I replaced all the double sided tape in the heli with velcro, so I could move stuff around easier. And I still attach everything else (weights and such) with velcro. Makes for easy access, removal, and repositioning.

I kept the double sided tape on the gyro, but everything else.
Yea, I have been using velcro as well for the gear I have been adding. It definately makes thing easier later on.
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