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Old Jun 23, 2010, 02:47 AM
flying lx is offline
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i am confuse,what does that for?
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Old Jun 23, 2010, 07:54 AM
Cici528 is offline
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the blue one is beautiful.
Old Jun 24, 2010, 02:48 PM
Jammo is offline
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Does anybody know where abouts the CG can be located on this bird?
Old Jun 24, 2010, 05:16 PM
foamcrazee is offline
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Quote:
Originally Posted by Jammo View Post
Does anybody know where abouts the CG can be located on this bird?
see post #38
or

"they show the cg being from the back intake holes
on top to the front of those little vert fins, i have a 15 c 2200 3s
and I put it behind the nose wheel and the cg is at the extreme rear line.
they say the lipo is 150 grams, I have a 3s 2650 30c coming which is 240 grams so we shall see"


.according to him, it seems like at the orange line in the photo to me
Last edited by foamcrazee; Jun 24, 2010 at 05:26 PM.
Old Jun 24, 2010, 07:15 PM
toliver66 is offline
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65mm back from the leading edge of the wing at the fuse. Which is just a little further back than foamcrazee pic shows but not much. The CG location is shown on the instruction sheet. Seems a little nose heavy at this location though
Old Jun 26, 2010, 06:57 AM
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,



mine :-)


.
Old Jun 28, 2010, 05:36 AM
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I have just finished building my F-18 and I also am having a problem with the CG (nose heavy). What can I do to shift the weight towards the rear of the plane? My lipo is already as far back in the battery tray as it can go.

This CG problem is the only thing holding me back from maidening her.
Old Jun 28, 2010, 08:31 AM
Don Shimoda is offline
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will work for stick time
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Jammo,

What size battery are you using, and where is the cg with it as far back as it will go? I mistakenly maidened mine very nose-heavy, with the cg at about 40mm, and it still flew ok. Make sure you've got a bit of up-elevator trimmed in for launch.
Old Jun 28, 2010, 09:28 AM
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I'm using a 3S 1300mah battery. I think I may have mounted the battery in the wrong place. There are two compartments. One compartment is in the nose of the plane and the larger compartment is behind the nose wheel and servo. I have placed my battery in the nose compartment and my receiver behind the nose wheel. I think I may need to swap the location of the receiver and lipo.

I have placed red lines where my CG is.

Last edited by Jammo; Jun 28, 2010 at 09:39 AM.
Old Jun 28, 2010, 10:14 AM
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Try moving the speed controler to behind the motor and fan like on HET planes, I'm using the freewing clone version from Hobbyking makes 2LBs of thrust plus its a little heavier than a normal 4000+kv innrunner with a 2.3 shaft. You never want to add weight in a DF in my opinion.

Hobbyking Freewing Clone #2.3gp (0 min 27 sec)
Old Jun 28, 2010, 10:14 AM
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Sorry, im using a 2200 mah 30c
Old Jun 28, 2010, 10:26 AM
Jammo is offline
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That's a good idea. I had not thought about moving the esc.
Old Jun 28, 2010, 10:28 AM
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Maybe receiver to
Old Jun 28, 2010, 11:38 AM
Don Shimoda is offline
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will work for stick time
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Jammo,

My receiver is in the front compartment (nose cone) and my battery is in the rear one. Switch yours around and you'll be able to achieve the cg you're looking for.

Don
Old Jun 28, 2010, 11:41 AM
Jammo is offline
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I will do that. Thanks


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