Plans
Here is a selection of LongDistance boomerang plans. The pictures shown on this page are of
a relatively low quality. High resolution plans are available, just click on the download link after the picture. (Note: The GIF-files are quite large. If you cannot load the picture in your browser, try to download it by clicking on the right mouse button and save as for Windows or just holding the mouse button and save as for MAC-User.) Print out the plan and xerox it until the 10cm bar is 10 cm long to get the correct size of the boomerang.
Following plans are
available:
|
Lefties beware
No, we did not forget you. Here is what you can do: To get a left handed boomerang you will have to mirror the plan before you print it. Then enlarge the print on the xerox machine until the 10 cm bar is actually 10 cm. If Michel Dufayard gets asked if there are lefties throwing distance here, this is what he mightanswer:
Oui, et ils emmerdent tout le monde.
|
The
Gem, by Herb A. Smith (GB)
Download
The Gem (69K)
Material: Plywood
6mm
Weighting: 20g (15g
at the tip and 5g at the elbow)
Distance: 100 m reported
by Herb Smith, although with quite a breeze
[2001] This is the
boomerang Herb Smith used to set his Guiness Book World Record throw of
108 yards (98 m) at the Littlehampton Sports Field in Sussex, United Kingdom,
on 17th June 1972. The boomerang was heavily weighted with lead inserted
into both wingtips. There is another small weight on the elbow to give
the boomerang a lower flight trajectory and allow it to return on a more
horizontal plane. Dont insert the elbow weight into the material, it substantially
weakens the boomerang, rather use adhesive tape. You may use Herbs airfoil
(see high-resolution plan), which has bevels, or our proposed airfoil,
which has an undercut. The World Record Gem had a massive weight of 240
g and required a monster arm for throwing. Accounts of people having seen
Herb throwing report that his throw was very powerful indeed. Looking back
it seems like a miracle to be able to throw a boomerang of THAT shape 100
m out and back ! It is only accomplished with brute force and a good wind.
In the late 70s and 80s, Herb designed a plethora of more sophisticated
LD boomerangs, treasures and precious collectables today, for example the
famous Sussex Hook, Marathon, Tigarang,
Mount Fuji, Ninja etc. |
Short
Marathon, the Tigarang, by Herb A. Smith (GB)
Download
Herb A. Smith Rangs (77K)
Material: Paxolin
3.2mm
Weighting: 20g (15g
at the tip and 5g at the elbow)
Distance: 100 m +
with a breeze of 7 MPH
Here are two of the
famous LD-boomerangs by the late Herb A. Smith. During his experiments,
Herb designed a large number of shapes. Most of the modern LD shapes can
be related to one of his boomerangs, even the Challenger III. So if anybody
out there has the intention to find his or her own design it was most probably
already found by the man from Sussex, England. On the download plan, Herb
has added a few notes: there is a sketch of the flightpath and hints concerning
weighting and tuning. |
Sussex
Hook, by Herb A. Smith (GB)
Download
Sussex Hook (23K)
Material: Paxolin
3.2mm
Weighting: none
Distance: ca. 40
m
Here is another famous
LD-boom by Herb A. Smith, the 'Sussex Hook'. The plan shown here was made
using an original hook, made in April 1994. Since there is no weight on
the boomerang, the range is only about 40m. Herb made different 'Sussex
Hooks', varying size and material (paxolin or wood). Herb used a Sussex
Hook with a distance of 65 yards (~60m) to throw around the Wahsington
Monument in the year 1976. |
Bob's
Hook, by Bob Burwell (AUS)
Download
Bob's Hook (76K)
Material: GFEC 6.2
- 6.4 mm (original boom was probably hand made resin + fibres)
Weight: 136g
Weighting: none
Distance: 120 m
(max 120m written on the original boom)
[2001] Bob Burwell
of Australia was one of the main figures of LD in the 1970s and early 1980s.
He broke the World Record several times during that period. The rules were
somewhat different from what we have today, though. The distance was measured
only on a straight line perpendicular to the throwing base line. So even
if the boomerang went out further more to the right or left of that line,
this extra distance was not accounted for. One of Bob's throws, measured
at 111m with that method, was reported to go out at least 120m maximum
distance slighlty off the perpendicular line. The plan is based on
a boomerang Tibor got from Bob in 1998. It was probably built in the 1980s.
It is heavy and thick, and the airfoil is VERY blunt on the wing tips.
Sophisticated low lift / low drag airfoil design was only introduced later,
among others by Volker Behrens. It is therefore only with brute force that
you can get this boomerang to fly 120m out and back ! |
White
Lightning (Big Al Hook), by Al Gerhards (USA)
Download
White Lightning (75K)
Material: strip
laminated wood 7.7 mm
Weight: ~180g
Distance: 80 - 120m
[2002] This is another
World Record boomerang. Al Gerhard attained a distance of 112 m in 1979
with this type of boomerang, a heavily weighted strip laminated hook. As
the wooden strips are aligned with the shape of the boomerang, it is strong
and more resistant to breaking than simple plywood, especially with the
heavy weights embedded within the wingtips. Furthermore, to layers of strips with 4mm thickness are laminated together in double offset fashion to increase strength. At that time, paxolin and epoxy
resin based materials were not used yet very commonly in the boomerang
scene, probably because they were difficult to obtain as sheet material
and one had to mix and harden the resin oneself. Al Gerhards was very tall
and, apparently, he had a very powerful throw, which is necessary for this
kind of boom. The material thickness if 7 mm, so there is a consideralbe
airfoil drag, which has to be counteracted by the inital velocity of the
boomerang, in order to make it return to the thrower after travelling for
over 200 m. |
Voyager
I, by Manuel Schütz (CH)
Download
Voyager I (26K)
Material: GFEC 3.1
mm
Distance: 150-240
m
[1999] The World
Record of 238 m was set with this boomerang by Manuel Schütz (Kloten
1999). It is obviously derived from the MegaQuirl and
the Pathfinder II. Manuel says 150 m can be attained
without the lead in the leading wing. In good conditions, he throws over
200 m. As you may know, the NASA Voyager (I and II) space
probes, launched in 1977, are the most distant man-made objects. They
are currently approaching the boundary of the solar system.
Manuel gave the
details about how the airfoil needs to be carved. Download the full-size
plan using the link for a detailed version, including airfoil crossections.
As usual with Manu's booms, everything is perfectly rounded and smooth.
The rough carving is carried out with a file, then sand paper is used from
40 to 1000 grain size. Manuel always works wet to absorb the dust. The
airfoil is generally very sharp to minimize drag.
In a newer version
of the airfoil, the trailing edges are carved concave, from the middle
of the wing to its tip, the elbow region is not altered (The older version
is shown shaded). This seems to bring about a significant reduction in
drag, as we've noticed that the average velocity of the rang is much higher,
especially in the last phase of the flight. Manu assumes that this airfoil
reduces the wake (turbulence behind the airfoil) and thus the drag.
Tuning: a small
positive dihedral on the leading wing (0.5-1 mm), possibly a small negative
angle of attack (B WARE: the boom is very sensitive here - too much and
you'll have a kylie.)
Throwing: wind angle
20 °, elevation 0-5 °, tilt angle 80 °, maximum spin and maximum
throwing power !!! Hey, these are Manuel's hints ! If you know his throwing
power, you can imagine what that means to ordinary people. At least I
(Lorenz) am not able to throw the booms that Manu has adjusted to his throw;
they tend to crash on their way back. By giving rotation, you stabilize
the boom. In fact, Manuel usually throws 20 to 30 m farther with my rangs
! |
MegaQuirl
Pathfinder II, by Manuel Schütz (CH)
Download
Pathfinder II (207K)
Material: paxolin
3mm
Distance: 120-160m
[2001] This is the
original plan Manuel drew of his record breaking boomerang of 1998. It
is obviously a MegaQuirl modification. It was designed
around the period when a lander named Pathfinder was deployed on the surface
of Mars by the NASA. The name actually reflects Manuel's effort in LD quite
accurately. He noticed relatively early (1997) that Challenger sized booms
were not ideal for throwing LD. The MegaQuirl had been around for some
time, but nobody had Manuel's insight (and skill) and most people felt
that a real LD boomerang must be Challenger sized. At one of Manuel's
early LD tournaments (Troyes 1997) he broke the Swiss record (120.72m at
that time) with a throw over 124.2 m with a MegaQuirl shape (pax 3mm).
It did last only a few minutes, though, as I (Lorenz) threw 132.2 m with
a Challenger III (GFEC 4mm !) a little later. This, however, was the last
time I beat Manuel... Anyway, the Pathfinder was a milestone on Manuel's
path to designing the most advanced LD shape we know, the Voyager
I. |
Makro,
by Axel Heckner (D)
Download
Makro (56K)
Material:
Postcard size: GFEC (or circuit coard)
2 mm (span 14.7 cm !)
Full size: plywood
6mm or paxolin 4mm
Distance: 70-80 m
(postcard size), 100 m (full size)
[2001] The Makro
was published in the IV/89 edition of the German Bumerang Welt magazine
as a LongDistance postcard-size boomerang!! The shape has inwardly swept
wing tips in order to fit the size of a postcard. Axel reported a measured
distance (one spotter) of 70-80 m. Awesome for a boomerang that small !
Apparently, he also spent hours searching for the little boom in twilight.
There was a diameter 10 mm lead weight on the leading arm. There are strong
bevels on both wings, which is unusual for an LD boom, the one on the trailing
arm being more pronounced.
A few years later,
an article by Axel Heckner was published in the German Info, No. 37,
March 1992, where he reports experiments with a large Makro (32.5 cm span).
He stated that the inwardly swept wings of the Markro, originally introduced
to fit the postcard size, actually represent an important feature for an
LD boomerang: they have a low effectivity (term coined by Axel), which
means they do not point towards the center of gravity. This results in
a higher effective chord length, concomitant with a lower lift. Part of
this theory was later implemented in his MegaQuirl design for the trailing
wing. The leading wing of the MegaQuirl, however, is rather effective.
Axel also confirms that making the trailing wing narrower that the leading
wing, as seen for instance in the Challenger, gives better returning properties.
It seems that the full size Makro has strong bevels as well. We do not
think this is a good feature, so we have our own airfoil suggestion for
wood and paxolin (see high-resolution plan). |
Challenger
III, by Volker Behrens (D)
Download
Challenger III (59K)
Material: paxolin
4mm or glassfiber/epoxy composite 4mm
Distance: 100-150m
[1997] The world
record was held with this boomerang (paxolin) by Michel Dufayard. I (Lorenz)
use the composite material, although it becomes rather heavy (170g) in
the end. The Challenger III and variations are commonly used in LD tournaments,
and I have always seen boomerangs similar to the ChallengerIII in the best
scores. But it is not a rang for beginners as it needs stable throwing
parameters. But if you manage to throw a properly weighted Challenger III,
it will go far !
[2001] The reign
of the Challenger III and Challenger type boomerangs (FullPower, Straight
Shooter, Far, etc.) ended with the advent of competitive LD boomerangs
derived from the MegaQuirl, i.e. Buzz Whip and Voyager
type shapes. Being smaller and lighter, these are much easier to throw
and handle and perform much better, and it is not unusual that beginners
attain more than 100 or even 120 m on their first tournament. |
FullPower,
by Michel Dufayard
Download
FullPower (179K)
Material: birch
plywood 6mm or paxolin 4mm
Distance: wood: 110m,
paxolin: 120-130m
[1998] People often
think that this is a Challenger III. It is not. Michel sometimes uses the
wooden FullPower at competitions and attains distances over 100m. The LD
World Record for wooden boomerangs is held with this boomerang by Michel
Dufayard (120 m, Troyes 1997). The paxolin version travels farther: Up
to 130m have we witnessed. Eugène Cinal has a whole bunch of paxolin
models and always throws very far. The return flight looks great. The boom
sort of surfs back to the thrower.
[2001] We should
point out that 130 m is not considered very far anymore these days... |
Straight
Shooter, by Volker Behrens (D)
Download
Straight Shooter (85K)
Material: 4 mm paxolin
Distance: ~100m
[2001] This is another
famous boomerang by Volker Benhrens. The description on Volker's homepage
www.blue-star-rangs.de
is :
This model also enables you to break
the 100m barrier, but its full potential isn't quite as far as the Challenger
III. Due to the narrower elbow it retains spin much better and makes
it easier to get a full return, even with a catch. |
LDPR,
by Gerhard Bertling (D)
Download
LDPR (66K)
Material: paxolin
4mm
Distance: ~110m
[2001] You might
wonder what this boomerang's name means. LDPR simply stands for Long
Distance Paxolin Rang. According to Gerhard, the design is derived from
the Herb Smith model Black Prince. The LDPR is V-shaped with a small
elbow region and therefore cannot go out extremely far. Moreover, you can
expect that this elbow design will cause rather high wind drag. You need
quite a strong arm, and a little wind, to get it to fly over 100m and all
the way back. The trailing arm has distinctive LD characteristics, i.e.
it is narrower than the leading wing and swept inwards, reducing thereby
the effective lift. The leading arm does not have the hook feature, the
forward swept wing tip. This wil theoretically give a wing with less lift
and a small layover rate, the same features the Makro
exhibits. |
Satch
Boogie, by Michel Dufayard (F)
Download
Satch Boogie (40K)
Material: Paxolin
2mm (+ 2mm lead)
Distance: Paxolin:
80-90m (in a hurricane!)
[1997] This boom
is not for low winds or anything under BFT 7. You may use this boom in
very windy, very unstable conditions to attain an acceptable distance.
The lead has to be placed underneath the tip of the wings. You need to
carve an airfoil in the lead ! If you live in a very windy area, try this,
if not: B WARE. |
Miniathlon
I, by Winfried Gorny and Joerg Schlegel (D)
Download
Miniathlon I (97K)
Material: Glassfiber
or Carbonfiber /Epoxy Composite 3.2mm
Distance: 80-110m
[1996] We built several
Miniathlons in GFEC. They are just great: with a total weight of about
70g you can attain 80 to 100m, and its easy to throw. Just add weight on
the leading arm to stabilize its flight and adjust range. We built the
Miniathlon I also in 3.2mm carbonfiber/epoxy composite. Since this material
is stiffer, we xeroxed the shape to 115%. The material is light, so only
little weight is added. With 10g on the leading arm,110m are possible.
If you choose to download the plan, you will get additional information
about the airfoil. But we must advise you to be careful with undercut,
especially if you use carbon fiber material. Begin with little undercut,you
can always add more. |
Sky
Shuttle, by Georgi Dimantchev (BUL)
Download
Sky Shuttle (25K)
Material: Glassfiber/Epoxy
Composite 2.8mm
Distance: 80-100m
[1998] Georgi knowns
a lot about aerodynamics. Especially known is his MTA named 'Vector'. But
he has new ideas for airfoils especially for LD as well. Georgi has published
a book about boomerangs called The BoomerangPuzzle. |
Shuttleworth
Long Distance, by Gordon Shuttleworth (GB)
Download
Shuttleworth Long Distance (54K)
Material: paxolin
3mm (4mm, GFEC 3mm ?)
Distance: 100m ?
[2001] Gordon Shuttleworth
was probably the second most important LD thrower in Britain after Herb
Smith. He held the national record over 103.5 m (set in Sedan, F, 1993)
for 8 years. We are not sure if this is the record breaking boom, though.
The plan was published in the German Bumerang Welt magazine, issue IV/90.
The name of the boom is not clear, the plan was just titled Long Distance.
It is possible that the shape is a variation of one of Herb Smith's designs,
at least it looks very similar to one of them. The original material is
3mm paxolin, but we think 4mm pax or 3mm GFEC might work better (certainly
it will be less prone to breaking). The full weighting is two holes of
12mm diameter on the leading wing filled with lead. Beginners are advised
to use less weight. The airfoil is the same for both wings, so the plan
only shows the crossections on one. It is not very aggressive, rather blunt
leading edges and small undercuts. Actually, in the description of the
plan it says that the boomerang has to be thrown DOWNwards, which is a
clear indication of excesive lift. |
Mega
Quirl, by Axel Heckner (D)
Download
Mega Quirl (26K)
Material: Paxolin
or Glassfiber/Epoxy Composite 3mm
Distance: 90-120m
[1997] The Mega-Quirl
is derived from the widely known MTA named Quirl. Axel Heckner uses 3mm
GFEC for this LD version. This shape is completely different from other
LD Booms. It is very small and light. Therefore, it does not need a hard
throw, it must be thrown rather like an Aussie Round boomerang. For throwers
used to the heavy hook type, however, it might be hard to handle - at least
for me (Lorenz). It is often seen at distance competitions in Europe. |
Buzz
Whip, by David Schummy (AUS)
Download
Buzz Whip (67K)
Material: Glassfiber/Epoxy
Composite 3.5 to 2.5 (3mm to 4mm! pax is also possible)
Distance: 90-180m
[1998] That's the
boomerang David Schummy used to set a new World Record (174 m, St. Louis
1998). Actually we are not quite sure which version accomplished the 174m,
so we simply posted both for you to try out. I (Tibor) made several copies
of both and am not sure which is better. I feel like the lower version
works better in low wind conditions, while the upper shape works fine in
nice winds. (Please if you are interested in purchasing one of Schummys
boomerangs, proceede directly to his homepage: http://www.fixaframe.com.au/)
I made copy in 4mm paxolin. It works well, but won't go all the wayout.
However, I then decided to build an enlarged (119%) version and made it
of 4mm pax. Works fine. The choice of material should definitly be a very
rigid thin (2.5mm would be best I guess) composite. G10 gets warped quite
fast after a few crashes. G11, a higher quality GFEC, should do the job.
The Schummy airfoil
is very sophisticated. There are multi-step edges, changes in the center-line,
built-in angles of attack an so on. So our Schummy airfoil is just a
rough guess. However, we are sure that the leading edge is quite pointed
and that the undercut is very pronounced, more than half the material thickness
at some points. |
Mega-Icerunner,
by Manuel Schütz (CH)
Download
Mega-Icerunner (41K)
Material: Plywood
5mm
Distance: 90-110m
[1998] Yes, here
is a three-bladed LD boomerang !! Michel Dufayard hasa three-bladed model
as well, named 'Satch Boogie' (Paxolin 3mm), which is
reported to reach distances of 80-90m (with quite a breeze, though). Manuel
Schütz took the famous Icerunner from Fridolin Frost, made it 'Mega'
by inclining the blades even more to the front, carved an LD airfoil and
added a ton of lead. Note that he used simple 5mm plywood. In competition,
he threw 90m in dead calm conditions. In a light breeze,>100m can be obtained.
Additional information about the airfoil can be found on the plan. There
are lead weights inside 20mm (!) diameter holes on the wingtips.
|
Explorer,
by Daniel Luycx (B)
Download
Explorer (70K)
Material: FR4-G11
GFEC 3mm
Distance: 100-110m
[2002] This design
is dated March 1997. Daniel Luycx held the Belgian record for some years at 101.90 m, set in Sedan, 1993. At that time, the distances were still measured with a steel tape, actually 2 or 3 50m steel tapes tied together with scotch. The laser rangefinder was only introduced in 1997. We don't know what boomerang Daniel used for this record. |
Maïdo,
by Herman Peeters (B)
Download
Maïdo (70K)
Material: paxolin
4mm
Distance: 100-110m
[2001] This design
is from the late Challenger era, dated August 1997. It is a combination
of the Straight Shooter with the wing width
of the Far. The airfoil is moderately aggressive,
making it a safe performer with range of the order of 100-110m. Maïdo,
meaning 'burnt land' is a stretch of land along one of the 3 craters of
the volcano 'Piton des Neiges' on the island of Réunion in the Indian
Ocean. Herman was inspired by the fantastic landscape while being there
with his wife. |
KiFisch,
by Uwe Kitzberger (D)
Download
KiFisch (16K)
Material: GFEC 2.5
- 3 mm
Distance: 120-150m
[1999] This strange
shape was obtained rather by accident. Since Uwe Kitzberger from Germany
showed up on tournaments he had been throwing his queston mark shaped boomerang,
built of thin (2.5 - 3 mm GFEC or GFEC/CFEC) composite. But once during
practice he lost one of his booms in the corn. When he found it some weeks
(or months ?) later he noticed that the end of the trailing arm had been
broken about 2/3 down. So he smoothed the wound and went throwing again,
although he was sure that the boom wouldn't perform well. But he was wrong,
it flew great...
The Ki- in the
KiFisch stands for Kitzberger, by the way. |
E-4s,
by Herman Peeters (B) & Ed ter Laare (NL)
Download
E-4s (93K)
Material: GFEC 3.2
mm including paint
Distance: 100-130m
[2000] Ed writes:
It started with Herman Peeter's idea to put most of the modern LD-booms
on one drawing board and contruct a new average shape out of that. We both
ended up with a different result though. Must be a matter of accents....
I made 2 versions
of mine and it turned out to be a really nice flyer. Somehow it gains a
lot of height at the most outer part of the flightpath and it has a narrow
turn there giving it a quite save return (which I need looking at the last
few competition results :-). It's not a very reliable measurement since
we were only with the two of us (Lars Overzee and me), but the (rangefinder)
distance was between 120 and 130 meters with most throws. Despite some
variations in the (mostly symmetrical) airfoils, both versions flightpaths
looked very similar. It could be that it's an easy to reproduce model. |
Distance
E, by Lorenz Gubler (CH)
Download
Distance E (43K)
Material: birch
plywood 5mm
Distance: 50-70 m
[1996] This is a
boomerang especially for beginners of LongDistance. Please machine the
airfoil according to the hints on the plan you will get by clicking above.
The boom can be weighted on the leading arm. We adviseyou to experiment
with airfoils and weighting on different spots on theboomerang. You w ill
learn a lot !
[2001] Although there
is some nostalgic value in this boomerang, if you want to start building
and throwing LD, you will have the most success by building a Buzz
Whip or Voyager straight away. |
Distance
K, by Lorenz Gubler (CH)
Download
Distance K (53K)
Material: plywood
6mm
Distance: 70-80m
[1997] Here is an
easy-to-handle wooden hook. With a little weight onthe leading arm, 80m
are easily obtained. I love to throw this boomerang, because it does not
stress the thrower's arm like the heavy paxolin or GFEC models. When you
intend to throw heavy boomerangs, it is recommended to make a dozen tosses
with a light LD boomerang like this before. Otherwise your arm will be
ruined in no time. |
BAg
Hook II, by Tibor Horvath (CH)
Download
BAg Hook II (95K)
Material: Paxolin
4mm
Distance: 90-100m.
110m+ with additional weighting.
[1997] Use the B
AGGRESSiVE airfoil or Michel Dufayard's airfoil, both work. Wingspan is
38cm. |
Far,
by Tibor Horvath (CH)
Download
FAR (43K)
Material: Glassfiber/Epoxy
Composite 3mm (or Paxolin 4mm)
Distance: 90-110m
[1997] This is the
GFEC boomerang in the B AGRESSiVE collection. A 'Far' should not miss in
your collection if you take LD seriously :-) Now let's be serious. The
advantange of this boomerang over the paxolin clubs 'BAg Hook II' and'Beatback'
is its small weight and easy-to-throw characteristics, while distances
of over 100m are still possible.
You may build the
'Far' in Paxolin 4mm if you xerox the original plan to 117%. With accurate
weighting you will get a first class competition boomerang with a range
of over 110m in a light breeze. When we first saw the 'Challenger III'
we thought it was the best LongDistance Boomerang available. A couple of
months later we got to know the 'FullPower'. We believed that it had a
better flight performance than the 'Challenger III'. So this began to be
our favourite LD boom. Much later, Tibor had the idea of building his 'Far'
in Paxolin 4mm. He therefore xeroxed his original'Far'-plan to 117%. On
the field we saw a boomerang with an excellent flightbehaviour. Since then,
we believe that the 'Far' is the best boomerang for throwing accurately
beyond 100m.
[2000] Times do change...LOL |
Beatback,
by Lorenz Gubler (CH)
Download
Beatback (48K)
Material: Paxolin
4mm
Distance: 90-100m.
120m with additional weighting
[1996] On the downloaded
plan, you will get additional information about how to carve the airfoil.
The design is dated Oct 95. I named the original shape BAg Hook, but
because the shape had slightly changed after a few iterations, I gave it
a new name: Beatback. Tibor named the hook he designed just after I had
my first version BAg Hook II. The Beatback is a large, Challenger size
LD boom that might be difficult to handle for beginners. With aggressive
airfoil carving (and lead weight on the leading wing) you can X-tend the
range to over 120m. |
Offspring,
by Lorenz Gubler (CH)
Download
Offspring (38K)
Material: GFEC 3.2
(or 2.5 ?) mm
Distance: 100-120m
[1998] This design
(July 98) is a combination of the MegaQuirl and the Straight Shooter. I
built it in 3.2 mm GFEC with rather conventional LD-airfoiling (for details
download the plan). The boom needs negative angle of attack and positive
dihedral on the dingle wing, otherwise it will just fly way out on a large
circle and won't rise. The distance is not extraordinary, but you can experiment
with the new generation airfoil of the Buzz Whip. I
filled a 14 mm hole on the leading arm with lead, so the boom has a weight
of 75 to 80 g. It must be thrown with 60 ° layover and upward because
it tends to dive on its way out. Use full rotation for maximum stability
and full power to prevent crashing on the way back.
We suggest trying
2.5 mm GFEC as well (which we didn't try yet). Performance might be improved
due to a reduction of drag. A problem might be the insufficient stiffness
and tendency to getting warped if you use thin GFEC, especially if the
quality is inferior. |
Backdraft,
by Lorenz Gubler (CH)
Download
Backdraft (24K)
Material: GFEC 3.2
(or 2.5 ?) mm
Distance: 110-160m
[1998] This shape
is only slightly different from the Offspring. I swept the trailing arm
more in forward direction, which reduces the efficiency of the wing,
concomitant with a reduction of lift. The elbow and leading wing are identical
to the Offspring in terms of shape. However, there is a more aggressive
airfoil. The onset of the carving is so smooth that I could not draw helping
lines. The wings are carved nearly symmetrical and the elbow is built for
minimum drag. There was not much tuning necessary to obtain good flight
behaviour, maybe a slight negative angle of attack on the trailing wing.
Distance is 110 to 120 m, with negative angle of attack on the leading
wing 130 m or more can be attained. Throw is 60° tilt angle and slightly
upward. Especially if you have negative aoa on the leading wing you have
to use maximum throwing power and rotation for stability.
We suggest trying
2.5 mm GFEC as well (which we didn't try yet). Performance might be improved
due to a reduction of drag. A problem might be the insufficient stiffness
and tendency to getting warped if you use thin GFEC, especially if the
quality is inferior.
[2001] The Backdraft
has been my favourite competition rang for 3 years. I attained a maximum
distance of 149 m (Payerne 1999), in practice maybe 20 m more.
If you have a plan
of a LongDistanceBoom of your conception and youwant it to get public,
send it to us, either e- or snail-mail.
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