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Old Nov 13, 2013, 04:32 AM
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ALL THINGS ROUND: FLYING DISCS, NUTBALLS, UFOs etc.

Introduction

Welcome!


This thread is intended as a catalogue of round, flying discs.


The main list - grandiosely called a database! - is in Post 5. Feel free to let me know if you'd like to add more - new or old - designs.
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Old Nov 13, 2013, 04:32 AM
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A few photographs...


Initially I thought that people would post details of round flyers.


But I was mistaken! Turns out the thread was enthusiastically inundated with lots of shapes.....some pure-round, some roundish, some not-so-round.


So I devised a simple shape classification: ROUND, SQUARE & DELTA.


If it ain't purely one of the above, then I decided to call it a SQUAROID (a round-fronted square) or DELTOID (a rounded delta).


See what I mean.......
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Old Nov 13, 2013, 04:33 AM
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Common characteristics of flying discs (and other shapes in the round mix)



Well, given that we have some variation in shapes, what do they have in common?



A: TAILLESSNESS

I suppose the very first thing to say is that these are all tailless aircraft - there is no separate tail-plane on which to hang conventional rudders or elevators.


B. INHERENT STABILITY AND CoG

All flying discs seem to be inherently stable - provided they are set up correctly {see post 10}. This usually means balancing it and getting the CoG in the right place.


C. SELF-CORRECTING STABILITY

Having said that discs are inherently stable (they will maintain level flight hands-off), there is one small detail to consider. When banked, they need to be returned on the sticks to level, and won't fully self-correct (though some might if flying very slow). So when I say "stable" I don't mean "self correcting". Not important for the old hands, of course. But newbs and learners need to be aware.


But there is one round flyer with built-in self-correcting capability - the Nutball. It is self-correcting because it has dihedral tips.


The Nutball, flown at low throttle, will self-correct from a banked turn and will assume level flight by itself if lightly loaded (low wing loading). But, with lots of throttle applied this self-correcting trait of the Nutball goes away at speed and is replaced by a beautiful "flying as if on rails" characteristic when banked - you have to return it on the sticks (or throttle back and let it self-stabilise to level).


D. TAKE A WALK ON THE WILD SIDE

Discs have a wild side, though! Just move the CoG back (progressively!), increase the throws and open up the taps on a lightly loaded disc and they transform from pussy cats into man-eating tigers! Best of all worlds - mild to wild! To get the widest performance range (from ultra mild to seriously wild) all discs seem to benefit most from two things: (a) light wing-loading and (b) a high (say 2.0) thrust-to-weight.


E. SIZE MATTERS....

Discs seem to get more docile as they get bigger. They lose that incredible nimbleness and agility that smaller discs have. Where the boundaries are depends on more than just disc diameter alone - it also depends on wing-loading and thrust-to-weight ratio. So, you control your disc's ultimate flight envelope when you fix those three parameters - Diameter, Weight and Thrust.


The "mini-fication" of many designs, and the "huge-ification" of other designs, proves at least one thing - all of these LAR designs can be successfully and simply scaled up or down to make them any size you like.


F. LAR (LOW ASPECT RATIO) CONSIDERATIONS.

One thing that these round, delta, square, squaroid and deltoid shapes all have in common is that they are all Low Aspect Ratio (LAR) designs in which the wingspan is a similar length to the root chord length.

Though they therefore share some of the same fundamental handling characteristics, it seems that pure round shapes may be better suited to less windy conditions than pure delta or deltoid shapes. Or, put the other way round, deltas seem to handle the wind better than round shapes!



G. CONTROL SURFACES.


When I started this thread, I assumed that a particular control surface configuration would be a defining characteristic of each particular design. Having read hundreds (thousands?) of posts on dozens of threads, I can say that is not actually the case! Designers, and their numerous collaborators, often chop and change control surfaces as designs evolve. There is, it seems, no "best" configuration - apart from the Nutball where the dihedral really demands a RET (Rudder/Elevator/Throttle) configuration.


H. IN CONCLUSION.

To round off (sorry!) this tour of round LAR flatties and their common characteristics, I can think of no finer illustration of the fluidity of thought processes that talented designers go through when considering "shape influences" than this thread started by Leadfeather:

http://www.rcgroups.com/forums/showthread.php?t=889439
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Old Nov 13, 2013, 04:33 AM
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Frequently asked questions


I guess the first one is "do they fly"? Oh yes. And how.


Related, might be...."But are they fun?". Oh my. You can't have more fun without taking your trousers off!! (old British saying). You can't do better for your hard earned dollar (substitute local currency as appropriate).


How round is..er..round? How about octagons or squares (Flying Pizza Boxes)? This is a great question, and one raised very early on in this thread as lots of different shaped flyers were enthusiastically posted.


What about design variants? What has been a real surprise to me in assembling this list of links is that the range of variations to the original design is smaller than you might think. But more or less all well known designs have them. They might include twin motors, prop-in-slot variants, rear pusher prop-in-slots and more forward prop-in-slots and regular tractor props or even EDFs (singly or in pairs) and co-axial motors! Then there are variants with and without landing gear which might or might not include wheels, skis, skids, floats or even whiffle balls. Rudders are a great source of variation too, depending on whether you need ground handling or want extra aerobatic control!


Are they expensive? You gotta be kiddin' me, right? These discs (any LAR design, really) have to be just about THE cheapest, simplest and quickest to make RC planes of all. A 24" Nutball or UFO or PiYak (etc. etc.) will cost just £2.50 for the scratch-built airframe. You can't buy a Starbuck's coffee for that. They are, as we British are fond of saying, cheap as chips (the alliteration doesn't work in the US, where that translates as "cheap as fries").


Another is....are they stable? Very stable when set up correctly with CoG at 25% (see post 10).


Is there a secret to success? Yes. Build light! Unless you like flying in a gale, then some ballast will help provided you don't kill the thrust-to-weight ratio (always above 1.0, 1.5 is better, 2.0 is brilliant fun). Personally I enjoy the challenge of flying when its windy (don't have a lot of choice here...).


What wing loading (W/L) should I aim for? Build light is the key to success.


But they don't make good trainers, do they? No. But....the Nutball has big dihedral tips and if built light and balanced at 25% makes a perfect trainer, even for self-build and self teaching with no help at hand (apart from the Nutball thread).


Anything I should know before the maiden flight? Er.........yes, as a matter of fact. With low W/L and a thrust to weight ratio between 1.5 and 2.0, a disc can display a wide range of personality traits. For the maiden, experts (such as goldguy and many others) recommend reduced throws, CoG at 25% and NOT FULL THROTTLE for the maiden flight. That encourages the pussy cat nature of your disc. After that, its up to you! Move the CG back, increase the throws and your little fluffy pussy cat becomes a man-eating tiger!
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Old Nov 13, 2013, 04:34 AM
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The Flying Disc Database


This is the guts of the thread.


It is just a simple, alphabetic list of designs that others have posted. Click on the blue link to go to the relevant single post which has links out to build logs and full threads.


As mentioned, I did originally think that control surface options might be a defining characteristic of specific designs. Turns out thats not the case, but I've kept them as accurate as I could.


If you are looking specifically for ROUND shapes, then the colour key should help.


Enjoy!

A-12 NO-STABILISER DELTA, by gpw, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=160
ACORN, by blueFFF. DELTOID. Rudder, Elevator, Throttle (RET). http://www.rcgroups.com/forums/showp...4&postcount=54
AFTERGEOBAT, ROUND, ALL OPTIONS!, http://www.rcgroups.com/forums/showp...&postcount=163
ALBATROSS by gpw. DELTOID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...0&postcount=36
ANGRY-BIRD & MAD BIRD, by rcrich. ROUND. Rudder/Elevator/Throttle (RET). http://www.rcgroups.com/forums/showp...3&postcount=29
ANNULAR DISC/CO-AXIAL PROPS, by samwei1950. ROUND. ELEVONS. http://www.rcgroups.com/forums/showp...1&postcount=62
BATFLYER, by MadDuc, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=153
BEE-GEE, by CitaFly, SQUAROID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=118
BLACKBIRD (BABY) SR-71 by Rusty-Gunn, DELTOID, RET, http://www.rcgroups.com/forums/showp...&postcount=165
BRAUN MOUSE, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=102
BULLSEYE, by gpw. ROUND (annular). Rudder/Elevator/Throttle (RET). http://www.rcgroups.com/forums/showp...7&postcount=55
BULLSEYE DELTA, by tymbrewolf. DELTOID (annular). Rudder/Elevator/Throttle (RET) http://www.rcgroups.com/forums/showp...3&postcount=56
BUG. DELTOID (heart) : ELEVONS. http://www.rcgroups.com/forums/showp...5&postcount=25
CAPRICORN, by Larry3215. DELTOID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...0&postcount=42
CHEAP-N-EASY, by rcrich, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...7&postcount=93
CITRUS, by Bobnormal, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=546
CLAM by UBUILDIT ROUND http://www.rcgroups.com/forums/showthread.php?t=595384
CLAM (with beard), by gpw. ROUND. V-TAIL MIX. http://www.rcgroups.com/forums/showp...6&postcount=59
CRAZYBALL by TheNiceGuy, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=187
CRIB, by tymbrewolf. DELTOID (reversed, annular). Rudder/Elevator/Throttle (RET). http://www.rcgroups.com/forums/showp...5&postcount=58
CYLON RAIDER, by SG Talon, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=203
CYLON RAIDER, by gpw, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=204
DARK PI, by sr71fan. ROUND. Elevons & Rudder. http://www.rcgroups.com/forums/showp...4&postcount=51
DARK STAR STEALTH DELTA by Rusty-Gunn, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=166
DELTA YAK by rctestflight, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=167
DING-A-LING by dekan, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=188
DOORMAT, by mohillybilly, SQUAROID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=112
DRENALYN by Philippe Jambon. SQUAROID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...8&postcount=38
ENTERPRISE-D, by SGTalon. ROUND. Aileron/Elevator/Throttle (AET). http://www.rcgroups.com/forums/showp...5&postcount=20
ESTRATOS, by Dave Reap, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=114
FIDDLEHEAD, by Ruddym, ROUND, RET or ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=377
FLAPPA, by RJPIoW, ROUND. Ailerons & Rudder. http://www.rcgroups.com/forums/showp...5&postcount=57
FLIRT & SFO by Viking60, SQUAROID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=189
FLOPSALOT by Logical-Psycho. SQUAROID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...7&postcount=48
FLYIN' CARPET, SQUARE, RET, http://www.rcgroups.com/forums/showp...&postcount=155
FLYING GENIE by Dave Barrow, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=169
FLYING SLED by rctestflight, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=170
FLYING SPONGEBOB by H2o Buffalo, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=171
FLYING WITCH, by Dave Barrow, ROUND, RET,http://www.rcgroups.com/forums/showp...&postcount=190
FLUTTERBY by gpw, BUTTERFLY!, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=168
FOAMIN RHOMBUS or LUCY IN THE SKY, by gpw, SQUARE (DIAMOND), RET, http://www.rcgroups.com/forums/showp...&postcount=172
GEOBAT, by Jack JonesROUND, ALL OPTIONS!, http://www.rcgroups.com/forums/showp...&postcount=161
(Large) GEOBAT, ROUND, ALL OPTIONS!, http://www.rcgroups.com/forums/showp...&postcount=174
GOOLIE, by Paul A Cook, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=110
HOOT, by Carl Vogt. SQUAROID. ELEVONS. http://www.rcgroups.com/forums/showp...0&postcount=68
HOVERING MACHINE by Ufly, SQUARE, RET, http://www.rcgroups.com/forums/showp...&postcount=191
IFO, by ?, KITE-LIKE DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...0&postcount=99
IMP by Aio-1, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=192
INDOOR ACE, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=113
INSANITY, by I Stockdale, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...1&postcount=98
ITZA-UFO, by sr71fan, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=105
Judy Jetson's UFO and The Creature UFO, by Rusty-Gunn, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=117
LEE-RICHARDS DOUGH-NUT, by Pardshaw, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=411
MANTA, by Viking60. SQUAROID. ELEVONS. http://www.rcgroups.com/forums/showp...8&postcount=69
MARVIN'S MARTIAN FLYING SAUCER by bobdaeronort. ROUND. ELEVONS. http://www.rcgroups.com/forums/showp...4&postcount=24
MARTIAN SPACESHIP by gpw, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=206
MERCURIAN MITE, by R. Malstrom UNDENIABLY ROUND, RET, http://www.rcgroups.com/forums/showp...9&postcount=95
MILKA-PLANE, by gpw, Sex-and-chocolate Round, Elevons, http://www.rcgroups.com/forums/showp...8&postcount=86
MINI-HEART, by Dave Reap. DELTOID (heart). Elevator & Rudder. http://www.rcgroups.com/forums/showp...4&postcount=46
MINI-GEE-BEE, by mike glass. SQUARE. Elevons & Rudder. http://www.rcgroups.com/forums/showp...7&postcount=49
MINI-IFO, KITE-LIKE DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=100
MINI-JAR, by Gary Jones. SQUAROID. Elevons & Rudder, http://www.rcgroups.com/forums/showp...1&postcount=70
MINI-PBF, by Leadfeather, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=107
M-TEE-PLATE, by Boxhead, Round, Elevons, http://www.rcgroups.com/forums/showp...0&postcount=78
MYFO, by golem. SQUAROID. ELEVONS. http://www.rcgroups.com/forums/showp...1&postcount=71
NIGHT KITES, VARIOUS, VARIOUS, http://www.rcgroups.com/forums/showp...&postcount=103
NUTBALL, by goldguy. ROUND. Rudder/Elevator/Throttle (RET) http://www.rcgroups.com/forums/showp...5&postcount=12
NUTSTANG NUTBALL by nagromnewo, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=368
OCTAGON NUTBALL & 8-BALL, SQUAROID. Rudder/Elevator/Throttle (RET). http://www.rcgroups.com/forums/showp...8&postcount=41
JETBALL NUTBALL by Joseico90, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=193
MICRO NUTBALL, by bungholio, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=194
NANOBALL NUTBALL, by Serge Roth, ROUND, RET http://www.rcgroups.com/forums/showp...&postcount=370
P-NUTBALL, an enhancement by goldguy, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=378
TWIN NUTBALL, by Joseico90, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=198
UNDERBALL NUTBALL, by Joseico90, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=200
O-FUNGLE, by Joel Rieman, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=721
OPUS by ChaosMurphy, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=177
PBF by Leadfeather. SQUARE. Elevons & Rudder . http://www.rcgroups.com/forums/showp...6&postcount=34
PBF by goldguy, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=116
(Maxed-mini) PBF by dz1sfb, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=176
PIGER P1 by Jack the R, ROUND, ELEVONS, TWIN RUDDERS, http://www.rcgroups.com/forums/showt...0#post29113812
(La) PIZZA by Fouman, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=173
PI-PLANE, by sr51fan, ROUND, ELEVONS & RUDDER, http://www.rcgroups.com/forums/showp...&postcount=178
PIYAK by aeronot. ROUND. Elevons & Rudder. http://www.rcgroups.com/forums/showp...2&postcount=52
PLATO. ROUND. Rudder/Elevator/Throttle (RET). http://www.rcgroups.com/forums/showp...6&postcount=32
POCKYLIPZ, by gpw. DELTOID. ELEVONS/Recommended optional rudder. http://www.rcgroups.com/forums/showp...2&postcount=72
POTATO CHIP, by gpw. ROUND, V-TAIL http://www.rcgroups.com/forums/showp...7&postcount=77
ROM and ROM VARIANTS by gpw, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=122
ROUND ONE, by dekan (after Paul A Cook), ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=104
ROUND SQUARE, by chaos murphey, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=108
SEA-RAY by Leadfeather, DELTOID, RET, http://www.rcgroups.com/forums/showp...&postcount=156
SHOE BOX by tymbrewolf, DELTOID, RET, http://www.rcgroups.com/forums/showp...&postcount=195
SIMPLE DELTA, by dekan. DELTA. ELEVONS. http://www.rcgroups.com/forums/showp...8&postcount=47
SIMPLETON'S PBF, SQUARE, RET, http://www.rcgroups.com/forums/showp...&postcount=158
SIMPLICIOUS by gtrScotty, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=179
SKYCART, by Leadfeather, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=180
SLOW BEE, by goldguy. SQUAROID. Elevators & Rudder. http://www.rcgroups.com/forums/showp...8&postcount=50
SLOW BOT by Danford1, SQUAROID, RET, http://www.rcgroups.com/forums/showp...&postcount=277
SLOW FLYING OBJECT by sloper steve, SQUAROID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=196
SNOWBALL, by Lee. ROUND. Rudder/Elevator/Throttle. http://www.rcgroups.com/forums/showp...6&postcount=45
SPACESHIP DELTA ONE by ootay, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=181
SPACE TAXI by Thomas B. ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=533
SPUTNICK, by G. Evans, ROUND & DIFFERENT!, RET, http://www.rcgroups.com/forums/showp...0&postcount=94
SQUARY BAT by TurboCinqy, SQUARE, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=197
SQUIRT and DELTA SQUIRT, by tymbrewolf, ROUND, RET, http://www.rcgroups.com/forums/showp...&postcount=109
STAR COBRA 3F by Golem, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=182
STOP-SIGN, by several folk, SQUAROID, ELEVONS or RET, http://www.rcgroups.com/forums/showp...&postcount=119
SUPER QUICK SCRATCH BUILT DELTA, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=120
THUNDERSTRUCK, by Boxhead, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...9&postcount=92
T-IFO, KITE-LIKE DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=101
TR3D by Joseico90. SQUAROID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...5&postcount=26
UAPV, by Leadfeather, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=121
UFO-AP, by troynh. ROUND. ELEVONS. http://www.rcgroups.com/forums/showp...37&postcount=9
UFO-44, by flyarmy58, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=111
UFO WITH DRAG TIPS INSTEAD OF RUDDER, by Boxhead, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=152
UFO-PIX, by gpw, DELTOID, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=199
UP and UP-BIPE, by gpw, ROUND, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=127
USAF-UFO, by gpw. ROUND. ELEVONS. http://www.rcgroups.com/forums/showp...63&postcount=8
USS ENTERPRISE, by R. Blackburn, Enterprise-shaped!, NOT CLEAR, http://www.rcgroups.com/forums/showp...7&postcount=96
VTO, more than one designer, SQUAROID, ELEVONS, rudder recommended, http://www.rcgroups.com/forums/showp...7&postcount=73
VTO, DELTOID, RET,http://www.rcgroups.com/forums/showp...&postcount=154
VTO BIG DELTA, DELTA, RET, http://www.rcgroups.com/forums/showp...&postcount=157
(Lev Jet) VTOL by Leadfeather, DELTA, ELEVONS, http://www.rcgroups.com/forums/showp...&postcount=175
WARP-9, by Jeff Raskin. DELTA. Rudder/Elevator/Throttle (RET). , http://www.rcgroups.com/forums/showp...7&postcount=74
W-WING, by Dave Reap. DELTOID (heart). Elevons & Rudder. http://www.rcgroups.com/forums/showp...0&postcount=23
YUK 54, by echassin. SQUAROID. Elevons & Rudder. http://www.rcgroups.com/forums/showp...9&postcount=53
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Old Nov 13, 2013, 04:35 AM
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The best of the best round flyers.


Well, I hope this isn't going to be too controversial.

There are lots of designs in the database above. Lots. But I when I began this thread I really wanted to concentrate on good, round designs.

Personally, I think there are just four round designs that really matter. They are gpw's (Glen Weber) UFO (aka USAF-UFO), sr71fan's (Gary Jones) PiPlane, goldguy's (Frank Weaver) Nutball and Jack Jones' Geobat.

Between them, these four original designs have spawned a huge number of variations and derivatives and have become serious influences for future generations of designers. At least that is my humble opinion.......

At a push, with my arm up my back, I might add the Drenalyn, though I know it isn't everyone's favourite for reasons we needn't go into here.
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Old Nov 13, 2013, 04:35 AM
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The discussion follows..............
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Old Nov 13, 2013, 04:53 AM
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Usaf ufo

USAF UFO by gpw.

The main link is here:

http://www.rcgroups.com/forums/showthread.php?t=553823


The thread is 180 pages and active.

There are several interesting variants on the theme in the thread, including ducted fan propulsion.

Some folk might be tempted to suppose that flying one of these is tricky. Or that they might be somehow unstable. Actually they are extremely easy to fly and very stable as long as they are trimmed out and balanced with CoG at 25% of chord from leading edge. Great design.


I built one of these myself, and from the start I decided to build it as light and strong as possible. It is 24" diameter, came out at 8.4 ounces AUW which gives a wing-loading of 2.67 OPSF. The BW 1300 motor with 8 x 4 prop takes 117 Watts from the 450 mAh 3S battery to provide 17 ounces of thrust - thats a thrust-to-weight ratio of just a tad over 2.0. I put bigger elevons on it and its a real precision ship!! Its a blast to fly.......a real delight! If you're interested you can see my post (on this thread) here:-

http://www.rcgroups.com/forums/showp...&postcount=301


Though my own experience is limited to building and flying just a few UFOs very recently, I can honestly say they are simply amazing to fly! They are the ULTIMATE flying round object and are so rewarding, I'll never be without at least a couple!
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Old Nov 13, 2013, 05:23 AM
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Ufo - ap

UFO-AP by troynh

Here is the link:

http://www.rcgroups.com/forums/showthread.php?t=1060816


The thread is 31 pages and classified as "very old".

What is so amazing about this thing is its size - 48 inches. The AP designation tells you it is a camera platform. Its a real floater and the weight is kept low and the airframe stiff by use of pallet strapping - way cheaper than Carbon Fibre and very effective. Watch his Part 1 construction video (Building the UFO-AP) on page 1 to discover his "secret weapon"...

The "classic" - and huge! - UFO-AP looks like this...
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Old Nov 13, 2013, 05:27 AM
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One of the interesting misconceptions is that discs are unstable .... Actually they are very stable ...But only if the CG is correct ... usually ~ 25% ...
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Old Nov 13, 2013, 05:50 AM
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Hi gpw!

Great to hear from the experts. Me, I'm just collecting this stuff in one place, so its really good to get the designers contributing, thanks!

Dave
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Old Nov 13, 2013, 07:30 AM
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Nutball, by goldguy.

Wow, what can I say!

This one has to be the most versatile, the most developed, the most built, the most widely respected, tried and tested of all the flying dics. Its been in commercial production, through (I think) more than one source - its that good! I bet it has more variants than any other flying disc, and I'll be listing them later on in this thread! And..... its Canadian (no, honestly...it is!). Joshing, Frank....

Here is the primary link to the much-loved Nutball.....but I will be adding further links on this post (i.e. post 12) to the many excellent variants of the Nutball, and numerous design and construction features contributed by so many enthusiastic and innovative contributors that Frank Weaver (goldguy's) design has attracted.

http://www.rcgroups.com/forums/showthread.php?t=836389


The above link is to a very active thread, with a great bunch of guys to help any newbies - or anyone! It really is a great machine and lots of folk describe it as their "go to" favourite for pure, addictive fun. But then I'm biased (see my avatar).

The Nutball has dihedral tips and is controlled on RET (Rudder, Elevator, Throttle). Everything you need to build and fly is in the FIRST TWO pages of the massive, active thread.

It may surprise some to learn that this is an ideal self-teach (if there can be such a thing) trainer. I know, because thats how I learned to fly. Don't take my word for it though. Plenty of others have found it makes a great trainer (but do pay attention to CoG and wing loading!).

Word of caution.....especially to learners.....whatever you do, don't use full throttle on the maiden! Read the first few pages of the thread.


Its so hard to pick just one or two videos to convey the spirit of the design. This commercial Youtube video by Josh & Josh pretty much says it all IMO. Just build one!

Flite Test - Nutball - REVIEW (8 min 39 sec)
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Old Nov 13, 2013, 07:36 AM
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Good idea

Are you thinking of perfect circles only are are you a little more flexible. The history of these models is that they are built round then they become a bit more lozenge or triangle then they go back to round, then lozenge, then triangle & so on etc etc etc. You might consider the W Wing as an example
http://www.rcgroups.com/forums/showthread.php?t=1504784

and then they get squared off & cropped a little;
http://www.rcgroups.com/forums/showthread.php?t=670844 or
http://www.rcgroups.com/forums/showthread.php?t=1340022
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Old Nov 13, 2013, 07:36 AM
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Subscribing!

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Old Nov 13, 2013, 08:16 AM
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Quote:
Originally Posted by ChrisE View Post
Good idea

Are you thinking of perfect circles only are are you a little more flexible. The history of these models is that they are built round then they become a bit more lozenge or triangle then they go back to round etc etc etc. You might consider the W Wing as an example
http://www.rcgroups.com/forums/showthread.php?t=1504784

and then they get squared off & cropped a little;
http://www.rcgroups.com/forums/showthread.php?t=670844 or
http://www.rcgroups.com/forums/showthread.php?t=1340022

Might I suggest an Index without "the" (posts 5 & 6) in front of every name might be a good idea & the photos in 2 do not need "a ....." or "the ......" before the model name. Is it possible to make the photos alphabetical in model name order?
Hi Chris

I think its important to be inclusive! I agree completely that the disc shape alters in related variants. Seems like a form of natural selection! And...as you say....the evolutionary pathway generally ends up back at a disc! Shows how good the basic disc is. So we should be a little more flexible, as you suggest!

I think the unifying concept is rough geometry - all these discs, double-you's, lozenges, fat deltas, square pizza-boxes and octagons have one overriding characteristic in common - they are all LAR (Low Aspect Ratio) flatties.

I'd offer the following two thoughts: all LAR designs are compact and have approached the maximum area area for practical ranges of length x width. Discs are just the most compact of all LARS. Secondly, it follows there is a kind of fuzzy distinction between, say, a disc and a fat delta. So its kind of a hard call to make, but sure, if they look "related" their in!

I'm a really big fan of Dave Reap's designs, including the W-Wing, and he has made so many important contributions to flying discs (and KFm adaptations and so many other fixed wing powered planes and gliders) that his designs will be itemised on this thread to make them accessible to "discophiles".

Your suggestion to drop "the" is gratefully embraced.....saves a bunch of typing, too!

Dave
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