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› Question on CG
12-29-2009 06:15 PM  7 years agoPost 1
700E

rrApprentice

Mississippi

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I read here about checking CG on the heli. Someone said to grap the grips, turn the heli to the knife edge position and it should rotate even in a circle. Well, I thought I'd try it this morning. First I tried it on my 700E and she spun PERFECT. Next, I tried it on my 600esp and it seems tail heavy. How do I fix this? Take a look at my setup. Looks clean so I'm not sure how to change anything. I did this with the batteries installed also. I'm sure you need the heli RTF to check this. Any thoughts here ???

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12-29-2009 06:49 PM  7 years agoPost 2
HeliCSR

rrApprentice

Hesperia, Ca, US

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NO that is incorrect.

You grab the heli by the grips with the grips sticking out the side of the heli.

Now you lift strait up and the heli should be slightly nose heavy.

That's how you check CG.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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12-29-2009 06:51 PM  7 years agoPost 3
700E

rrApprentice

Mississippi

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So how do I correct my 600esp from being tail heavy??

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12-29-2009 07:23 PM  7 years agoPost 4
HeliCSR

rrApprentice

Hesperia, Ca, US

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Put a bigger battery in the front. Or move something forward, like the radio battery.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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12-29-2009 07:24 PM  7 years agoPost 5
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Put a piece of foam under the battery to move it forward 1/4 to 1/2 inch.

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12-29-2009 07:26 PM  7 years agoPost 6
gian

rrVeteran

AZ

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Put yer canopy on?
Also, I agree that slightly forward CG is good for FF. Ideally, though, a perfect zero CG is what you'll be looking for when it comes to aerobatics/(I hate the term)3D.

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12-29-2009 07:38 PM  7 years agoPost 7
700E

rrApprentice

Mississippi

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Canopy was on and it help just a hair. Still tail heavy.

I run 1 - 8s lipo, no rx battery. The Jive has an amazing bec. I'll add something behind the battery I guess to add more weight.

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12-29-2009 08:15 PM  7 years agoPost 8
gian

rrVeteran

AZ

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I'll add something behind the battery I guess to add more weight.
Remember, you're not trying to add any weight- just shifting it forward. Weight is bad, mmmmmkay? Mmmmkay.

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12-29-2009 08:18 PM  7 years agoPost 9
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Buy yourself a big Scorpion motor. That will add a little bit of weight forward.

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12-29-2009 08:25 PM  7 years agoPost 10
700E

rrApprentice

Mississippi

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Tried different battery positions, didnt work. The Neu motor is awesome! I dont want switch it out. Really dont want to redo the entire heli setup. It looks so good. I'm curious to know if others with the 600esp have this problem, anyone? I'm on 8s too so I have more weight in the front already. Could it be the kasama tail grips??

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12-29-2009 08:38 PM  7 years agoPost 11
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Is that Neu motor? Then I take back my comment. You definitely don't want to switch that one out. I didn't look closely and thought it was just a stock Align motor.

How about a CF tail boom? That would probably make a big difference.

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12-29-2009 08:43 PM  7 years agoPost 12
700E

rrApprentice

Mississippi

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Thats an excellent idea. But I do like the blue boom She flies really good. Just looking to get it perfect I guess.

Think I'll order a boom and try it out.

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12-29-2009 08:47 PM  7 years agoPost 13
Justin Stuart (RIP)

rrMaster

Plano, Texas

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If you get the CG just right, you'll find your pirouettes stay more level. Definitely worth the price of sacrificing the blue boom. I'm just trying to make sure you don't give up the metal tail grips.

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12-29-2009 08:52 PM  7 years agoPost 14
700E

rrApprentice

Mississippi

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Do you think the aluminum boom is that much heavier than the CF boom? If so, that could be it!!

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12-29-2009 08:58 PM  7 years agoPost 15
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Yes, the aluminum boom is a little bit heavier. But keep in mind, that extra weight is concentrated way out on a long lever arm so it really magnifies the extra weight.

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12-29-2009 08:59 PM  7 years agoPost 16
twguns

rrVeteran

Indianapolis, IN

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I would think that moving the battery 1/2" to 3/4" forward will do the trick. A simple Balsa spacer (very light addition) would work nicely.

And yes, the aluminum boom should be a slight bit heavier.

bigTim

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12-29-2009 09:18 PM  7 years agoPost 17
700E

rrApprentice

Mississippi

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Tried moving the battery forward, didnt work. Put a blade holder behind the battery, strapped it in and checked it. Basically the same, still tail heavy.

So, you think the boom will do the trick jrockstuart?? If it's not that much lighter it's hard to believe that will do it.

I heard the 600's are tail heavy anyhow, just never thought of checking it until today. And to my suprise, it is!

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12-29-2009 11:02 PM  7 years agoPost 18
HeliCSR

rrApprentice

Hesperia, Ca, US

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Carbon boom will help because like he said the weight is amplified there at the end.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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12-30-2009 01:11 AM  7 years agoPost 19
700E

rrApprentice

Mississippi

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Ok, I'm gonna order the CF boom. I'll report after I install it what it did to the tail and CG. But in the meantime, does anyone have a 600esp they can try this with? Checking the CG by holding the blades and knife edging the heli?

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12-30-2009 01:53 AM  7 years agoPost 20
what_the_helli

rrKey Veteran

cookeville, tn USA

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here is the typical way people check cg, but most just use their hands and not a stand like this, but I do like the stand idea.

https://rc.runryder.com/helicopter/t542550p1/

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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