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Old Sep 19, 2012, 02:04 PM
Trishit is offline
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I did a little reading up. Please correct me if I am wrong:
I should go with a 32" diameter circle to get around 4 oz/sq. feet wing loading? Or should I go bigger? Given the approximate density of the coroplast, the fuselage itself would weigh around 280gms. That coupled with the electronics, glue and other bits would bring the AUW up to 660gms which is 50gms more than desired. I have no prior flying experience, and having crashed two of my planes, am really confused and frustrated now..
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Old Sep 19, 2012, 05:37 PM
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Your into new territory here using coroplast to build a NutBall.

I used cardboard to build a 26" slope NB, it was a heavy slug, but I had high winds and big lift to make it work. I've built other slopers and glow powered designs from coro and they all flew great, just not floaters.

So, all you need it big wind or big power, which you have, so go for the 32" and give it a try.

I
Old Sep 19, 2012, 05:44 PM
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Quote:
Originally Posted by Wingman26 View Post
Here's my recently completed NutBall, a photo ...............
Wow, I'm giddy...........a NutBall and a Pizza Box Flyer in the same frame.
Old Sep 19, 2012, 05:49 PM
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Trishit,
I did the calculations, a 36" diameter circle of coroplast at about 2.2 oz/sq.ft. would give you a Nutball with about 4 oz/sq.ft wing loading, not a floater, as Goldguy says, but it should work with your motor.
Remember, for first flights, the center of gravity should be at 25%, that's 9" back from the front tip for a 36" diameter.
Set up your controls for no more than 50% movement to keep your flight smooth and easy.
Use just enough speed to lift off and gain a good bit of altitude before you start trying flight manuevers.
Wishing you a good flight!
Old Sep 19, 2012, 07:01 PM
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Belém do Pará, Brasil
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modellers hello!
Sorry my bad language, use the translator. I admire this kind of model aircraft and for years I have been building and flying the Snowball and nutball. Models are excellent, calm and quiet flight.
Follow the videos.
SnowBall (1 min 47 sec)


Nutball rc (2 min 21 sec)


Nutball RC (1 min 56 sec)

Always eye on the posts in this topic
Good flights!
Warne
Old Sep 19, 2012, 08:03 PM
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Quote:
Originally Posted by warne View Post
modellers hello!
Sorry my bad language, use the translator. I admire this kind of model aircraft and for years I have been building and flying the Snowball and nutball. Models are excellent, calm and quiet flight.
Follow the videos.
http://www.youtube.com/watch?v=5iIGZKUlO8w

http://www.youtube.com/watch?v=WYASU9ixGlY

http://www.youtube.com/watch?v=W6Y-lLvTz34
Always eye on the posts in this topic
Good flights!
Warne
Your English is better than my Portuguese!
Old Sep 19, 2012, 08:19 PM
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What good is giving to understand what I wrote, all thanks to google translator!
It is with him that the following topics will Rcgroups.
hugs
Warne
Old Sep 20, 2012, 12:28 AM
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Thank you so much for your replies Goldguy and Redbird1! I am going ahead with the 36" nutball. This being my first plane, what points should I keep in mind other than the CG(at 25%) and the motor angles?
Old Sep 20, 2012, 02:20 AM
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Nutballs always fly well, whatever the size.. however going bigger makes them go docile..more trainer than aerobatic..

heres my 36" build... all 6mm depron ... with a KFm4 section (steps) added... https://www.rcgroups.com/forums/show....php?t=1049935 .
MY park fly Nutballs always end up at about 4ozsqft , whatever diameter I build, and they all fly well..
My preferred sizes are 26 - 32... for me the 36 went a bit too docile and was not aerobatic enough
Old Sep 20, 2012, 03:08 PM
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Anyone know where to get plans for a biplane design Nutball?
Old Sep 20, 2012, 03:34 PM
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Quote:
Originally Posted by Trishit View Post
Thank you so much for your replies Goldguy and Redbird1! I am going ahead with the 36" nutball. This being my first plane, what points should I keep in mind other than the CG(at 25%) and the motor angles?
It's important to have some down thrust, about 5 degrees on the motor and a bit of right.

Good luck and keep us posted.........
Old Sep 20, 2012, 03:39 PM
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[QUOTE=swimmer;22786962]Anyone know where to get plans for a biplane design Nutball?[/QUOTE

None that I know of because just two discs will not work. You'll need a tail and the right spacing between the two wings.

All easy enough to do, so go for it.....................build us a BallPipe.
Old Sep 20, 2012, 04:05 PM
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[QUOTE=goldguy;22787237]
Quote:
Originally Posted by swimmer View Post
Anyone know where to get plans for a biplane design Nutball?[/QUOTE

None that I know of because just two discs will not work. You'll need a tail and the right spacing between the two wings.

All easy enough to do, so go for it.....................build us a BallPipe.
Actually two guys at out weekly indoor fly-in had built as you say, BallPipe's. One had one disc directly over the other with the vertical stabilizer and rudder between. I believe both were 12". The other has staggered the top disc with stabilizer in same place as the other. I flew the first and it flew tail heavy. Added two quarters to the front and it flew decently. Three quarters would have been better but just not enough power. The other with the staggered disc, just not enough power from UM equipment.

My 12" Nutball continues to amaze me. The PoleCat motor handles the ball with ease and loops and rolls are pretty exciting. I was afraid the PoleCat landing gear would be to much weight but it flies like it isn't there. Last week had trouble with it veering left. Discovered the battery mounted left of the AR6400 was the problem. Moved it to the centerline and the veering left problem is gone. It ROG quickly and flies very smoothly. Control is snappy and the little ball really shows off.
Old Sep 20, 2012, 04:06 PM
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Quote:
Originally Posted by swimmer View Post
Anyone know where to get plans for a biplane design Nutball?
You could start here for inspiration:
Radio Controlled Flying Ducks (2 min 10 sec)
Old Sep 20, 2012, 04:14 PM
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Quote:
Originally Posted by ruddym View Post
You could start here for inspiration: http://www.youtube.com/watch?v=7zCHdI3Pw1M
Cool...but the duck motif is a little much for my style. It does give a good idea about the design, minus the duck.

Thanks.


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