HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 01, 2009, 10:53 AM
Registered User
United States, AZ
Joined Nov 2008
59 Posts
Does the weight of the battery cause the CG to change? I often use the Fusion Pack 3s 1300 weighting at 103g. However, I want to try the new Rhino 3s 2350 weighting at 198g that I just got. I'm afraid to try it again since my last crash with the F-22 and the Rhino pack.
helijet is offline Find More Posts by helijet
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 01, 2009, 11:42 AM
Let slip the dogs of war!
Park_Flyer's Avatar
United States, VA, Virginia Beach
Joined Jun 2005
1,675 Posts
Quote:
Originally Posted by helijet
Does the weight of the battery cause the CG to change? I often use the Fusion Pack 3s 1300 weighting at 103g. However, I want to try the new Rhino 3s 2350 weighting at 198g that I just got. I'm afraid to try it again since my last crash with the F-22 and the Rhino pack.
Absolutely! Just adjust it (back) accordingly so the cg is correct.
Park_Flyer is offline Find More Posts by Park_Flyer
Reply With Quote
Old Mar 01, 2009, 11:42 AM
CNC Cutter
birdofplay's Avatar
United States, IN, Indianapolis
Joined Dec 2005
8,280 Posts
At 28.35 Gms - 1 OZ
and since you are adding 3.35 OZ ...

I'd say YES to your question and Of course and Obviously too.

Unless your battery installation point is "Located" at the CG.

Move it towards the CG and recheck untill it balances .
birdofplay is offline Find More Posts by birdofplay
Reply With Quote
Old Mar 01, 2009, 12:13 PM
Registered User
United States, AZ
Joined Nov 2008
59 Posts
So the point where my CG is located doesn't change? It's just the battery placement change? For example, if the CG location is at 10cm from the wing break, that's is still where I used to balance the plane (though I must move the battery to get the plane to balance at that same point) no matter what battery I decided to use. Am I right?
helijet is offline Find More Posts by helijet
Reply With Quote
Old Mar 01, 2009, 12:51 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
16,964 Posts
The proper Center of Gravity ("CG") will always remain a fixed position on any given airframe. Putting more weight forward of the proper CG will change the actual CG of the model, and it will fly "nose heavy". Putting more weight to the rear of the proper CG will make the model fly "tail heavy".

I can use 2 different batteries in my F-22, a 1350 and a 2200. The 1350 goes all the way to the front of the electronics bay as it does not weigh as much as the 2200, and I need the weight further forward to maintain the proper CG.

In the first pic, you can see the two strips of velcro for the batteries. In the second pic, the CG is right under the wires coming off the RX.

Pat
crxmanpat is offline Find More Posts by crxmanpat
Reply With Quote
Old Mar 01, 2009, 02:03 PM
CNC Cutter
birdofplay's Avatar
United States, IN, Indianapolis
Joined Dec 2005
8,280 Posts
You got it right ! :-) Just like Pat !

I do this with A longer piece of velcro.

Smaller batteries go more towards the front
and larger ones go towards the back.

I've never lost a battery using the 3M velco in the red box from Wallyworld et al.
birdofplay is offline Find More Posts by birdofplay
Reply With Quote
Old Mar 01, 2009, 02:09 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
16,964 Posts
Lately I've been taking 3 strips of velcro and putting them lengthwise inside the electronics bay. This way I can move the lipos forward or backwards a little to adjust the CG to my flying style, or to adjust for different size lipos.

Pat
crxmanpat is offline Find More Posts by crxmanpat
Reply With Quote
Old Mar 01, 2009, 02:29 PM
Registered User
United States, AZ
Joined Nov 2008
59 Posts
I see. Thanks Pat and birdofplay.
helijet is offline Find More Posts by helijet
Reply With Quote
Old Mar 13, 2009, 09:53 AM
Registered User
Mordte's Avatar
Cheshire, Uk.
Joined Jan 2009
26 Posts
Finito,,

Well, here`s my F-22. Still waiting on the motor and esc so its not been flown yet. As soon as i finished the Mig-29 i had to build this, maybe try my hand at doing a half-fuse, its such a good looking plane i had to.







The stickers were what i had lying around from a Gws me 262, bunged em` on, voila! I cant wait to fly this thing, from the video ive seen its quite the performer.

Cheers Tomhe for yet another `triffic plane. *thumbs*
Mordte is offline Find More Posts by Mordte
Reply With Quote
Old Mar 13, 2009, 04:24 PM
That Guy Who Flies Wings.
La Vista, Nebraska
Joined Mar 2007
395 Posts
Nice work Mordte. The built up fuse is pretty slick!
frednjess is offline Find More Posts by frednjess
Reply With Quote
Old Mar 14, 2009, 01:03 AM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
16,964 Posts
Nice work Mordte!

Flew mine inside the Arizona Cardinals football stadium today!

Pat
crxmanpat is offline Find More Posts by crxmanpat
Reply With Quote
Old Mar 14, 2009, 01:11 AM
Registered User
capt's Avatar
Nevada, USA
Joined Sep 2007
1,919 Posts
Stellar build!
From a few feet you really can't tell the difference between these jets and the 200.00$ foamies. Maximum bang for the buck!
capt is offline Find More Posts by capt
Reply With Quote
Old Mar 14, 2009, 11:44 AM
A real WingNut
j4ck4's Avatar
United States, OK, Tulsa
Joined Dec 2008
882 Posts
Well, I just maidened the model I built about 2 months ago, finally got motor, esc and servos. This thing flies like a dream. Will try and post some video later today if I can get the camera to work.
j4ck4 is offline Find More Posts by j4ck4
Reply With Quote
Old Mar 15, 2009, 08:03 AM
Registered User
Mordte's Avatar
Cheshire, Uk.
Joined Jan 2009
26 Posts
,,bearing gifts.

My Dad just popped round with some "presents". Just want your opinions on usage. He mainly flies helicopters and most of this is from them.

The motor i have is a Frio 15, 1450kv. Its currently in my mig-29 with a 25 amp esc, cutting out at just over half throttle.

So, ive been given:

A "The Flying Machines" ESC BS40A,
An E-Sky 11.1v 1550 mAh, discharge rate:20C,
A Flightpower 1800 mAh 3s 1p 11.1v, 25C 45 amp cont, 40C 72 amp bursts,
Another Flightpower 2500 mAh 3s 11.1v 18c 45.0 amp cont, 28C 70.0 amp max bursts,
And finally a 3E Model 11.1v 2200 mAh 20C.

Thats as much info as i could gather from the batteries and esc. Im currently using a 1600 mAh Flightpower in the Mig.

If any of these would work with the Frio 15 and a 6 inch prop in the F22 , if any at all, id like your input if possible.

Cheers
Mordte is offline Find More Posts by Mordte
Last edited by Mordte; Mar 15, 2009 at 08:33 AM.
Reply With Quote
Old Mar 15, 2009, 08:52 AM
A real WingNut
j4ck4's Avatar
United States, OK, Tulsa
Joined Dec 2008
882 Posts
Well Mordite

I've only been flying for about 4 months now. But, one thing I have discovered is that any battery of the same voltage should work with your setup. Unless it is to high mah rating for esc or motor. I'd just check to see what the max is on both of those and go from there. I'd probably trust that the 1550 would fly well with your setup though you might want to try a short flight then check temperatures on esc and motor.
j4ck4 is offline Find More Posts by j4ck4
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Video f-22 with average pilot leadfeather Electric Plane Talk 1 Apr 24, 2008 12:49 AM
Video RCSuperPowers F-22 with Vectoring Thrust RCSuperPowers Electric Plane Talk 25 Feb 18, 2008 04:00 PM
Wattage F-22 with mixed surfaces & 208 watts/lb!! (video) meteor Electric Ducted Fan Jet Talk 30 Feb 09, 2005 09:57 AM
Wattage F-22 with ducted fan The Blue Max Electric Ducted Fan Jet Talk 11 May 10, 2003 01:13 PM
f-22 with jeti brushless ivorz Foamies (Kits) 14 Oct 01, 2002 08:39 PM