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C. G. On Fun-fly!

Old 10-09-2002, 02:15 PM
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Default C. G. On Fun-fly!

I HAVE A FEW FLIGHTS ON A NEW FUN-FLY W/ AN O.S. 46FX.
IT FEELS LIKE IT'S VERY NOSE HEAVY. I CANNOT!!!!!!!! ADD
WEIGHT TO THE TAIL AS THE PLANE IS ALREADY HEAVIER THAN IT SHOULD BE. I CAN MOVE THE BATTERY BACK 3" , BUT I DON'T THINK THAT WILL BE ENOUGH. DO PROFILE FLYERS EVER MOUNT THEIR BATTERIES OUTSIDE ON THE FUSE? IF I WERE TO MOUNT A SERVO ( OR BOTH ) IN THE TAIL , WOULD MONOCOTE STICK TO THIS CRAPPY COVERING ON IT NOW?
Old 10-09-2002, 02:27 PM
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Default C. G. On Fun-fly!

What covering is on the model now?

If it's an ARF then it is most likely a low temp covering.

Ultracote (or Oracover, they are the same thing) will probably work for your covering needs.

What model Fun Fly is it? What battery are you using?
Where is your CG set now? What does the Fun Fly weigh?

Answers to these questions will help us to help you.
Old 10-09-2002, 02:44 PM
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Default LOW TEMP?

THIS STUFF IS WORSE THAN LOW TEMP.
TT EXTRA PROFILE:
5.5 LBS.
600 MA - FLAT- 4.8
C.G. IS 5"
Old 10-09-2002, 04:01 PM
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Default Make it lighter

I've known people to rip off that contact paper crap that they put on these planes, lighten up the aircraft with the covering gone, then recover it with light covering, i.e. Nelson, or Monokote transparents, to get these aircraft below 5 lbs. Then they actually fly all right.
Try that, you'll find a decent aircraft hiding under the contact paper!
Kevin
Old 10-09-2002, 05:06 PM
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Default C. G. On Fun-fly!

If you don't like the covering, do what Kevin suggests. Rip it off and replace it! Life's too short to fly ugly airplanes.

The 600ma 4.8 volt pack should weigh a little over 3 oz. Moving it back and your motor forward should help the CG.

If not, moving the elevator and rudder servo to the tail will definitely help. And if you are going to replace the covering, it would be a good time to do it.

Another idea, but one which adds a little cost (about $20.00) would be to put carbon fiber gear on the plane. They weigh less than the stock aluminum gear. This would help kill two birds, It will help reduce the overall weight, and would help move the CG back. JWilliams and HSRCM sell carbon fiber gear for profiles.

Good Luck!
Old 10-09-2002, 07:37 PM
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Default C. G. On Fun-fly!

5 inches is about perfect for your plane. It should fly the same inverted and upright.
Old 10-10-2002, 08:27 AM
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Default C. G. On Fun-fly!

Thanks for the info guys, these mods sound good!

The main reasons i think it's so nose heavy:
1) I do have to give it quite a bit of down when inverted
2) when I do a spin up high from a stall, it drops like a rock
and it's more of a roll than a spin.

I guess the thing to do is just keep creepin' it back until
I start to lose it?
Old 10-10-2002, 08:30 AM
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Default latch66

If I'm moving my c.g. aft and move my battery back,
why move the motor forward?
Old 10-10-2002, 10:21 AM
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Default C. G. On Fun-fly!

He meant to move the motor backward as far as you can as well... typo. Just be certain you don't move the CG to far aft or you won't have a plane for long.

Kevin
Old 10-10-2002, 11:43 AM
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Default C. G. On Fun-fly!

Thanks PWRDrill,

Yes, move the motor back to move the CG towards the tail.

My hands did not type what my brain told them too.
Old 10-11-2002, 01:27 PM
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Default C. G. On Fun-fly!

For nose heavy, I used to put tyre balance lead on the stab root. I shouldn't need much as the tail moment is long.

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