HobbyKing.com New Products Flash Sale
Geode's blog
...
Posted by Geode | Mar 17, 2009 @ 02:15 AM | 20,291 Views
....
...
Posted by Geode | Mar 17, 2009 @ 02:06 AM | 20,293 Views
.....
Posted by Geode | Feb 22, 2009 @ 11:23 PM | 21,114 Views
Winter scratch building project - http://www.rcgroups.com/forums/showthread.php?t=993490
Posted by Geode | Jun 27, 2008 @ 07:22 PM | 25,486 Views
Build Log - http://www.rcgroups.com/forums/showthread.php?t=885896

Background Information:

Oblique Wing (from Wikipedia, the free encyclopedia)

An Oblique wing is a variable geometry wing concept. On an aircraft so equipped, the wing is designed to rotate on center pivot, so that one tip is swept forward while the opposite tip is swept aft. By changing its sweep angle in this way, drag can be reduced at high speed (with the wing swept) without sacrificing low speed performance (with the wing perpendicular).

ODS Flying Wing - Flight Test #2
Oblique Dynamic Soaring - Flight Test #2 (2 min 8 sec)

Project ODS highlight
...Continue Reading
Posted by Geode | Jun 08, 2008 @ 02:28 PM | 25,933 Views
Here is the balsa implementation of SGII-like pod. The pod is sliced into pieces (sliced contours), then assembled and sanded to shape (similar to the approach used in the wing tip).

1/1.5 mm CF rods for sides/bottom. A few 0.75oz FG stripes on four side, then a thin coat of water based varathane. Note that CF rods goes all the way to the pod/boom joint to avoid "neck" breaking during bad landing.

Pod and pylon AUW - 20g. Not bad compared to 25g raptre pod or my home made 15g "5oz CF/1.4oz Kevlar" pod.
Posted by Geode | Feb 22, 2008 @ 12:15 AM | 29,940 Views
Build Thread - http://www.rcgroups.com/forums/showthread.php?t=749390

Plan - see attachment. PM me with your email address for printable version.

Construction details
- Bagged foam wing
- Airfoil: PW1211
- Target weight ~ 10 oz
- With ballast ~ 17 oz
- Wing area ~ 336 sq. in
- Loading: 4.3 ~ 7.3 oz / sq. ft

Test Flight Video
Posted by Geode | Sep 29, 2007 @ 03:16 PM | 29,092 Views
New members to my DLG collections ......
Posted by Geode | Sep 22, 2007 @ 12:40 PM | 30,287 Views
Build Thread

On the slope - http://www.rcgroups.com/forums/showt...light=birdwing

On the flat land - http://www.rcgroups.com/forums/showt...97#post8188901

Plan - http://www.rcgroups.com/forums/showp...9&postcount=76

Design & Construction
- Light wind slope soaring and flat field DLG/HLG
- Birdwing Butterfly wing planform
- Peter Wick's PW1211 F3K plank airfoil
- Conventional balsa build-up wing

Vital
. Span - 60 in
. Area - 525 sq in
. Mass - 12.5 oz
. Loading - 3.4 oz/sq ft

Slope

Birdwing Flying Wing - Slope (3 min 35 sec)


HLG

...Continue Reading
Posted by Geode | Sep 10, 2007 @ 12:35 AM | 37,636 Views
Construction
- Manta DLG wing planform
- Hyperbolic wing bending
- Conventional balsa build-up wing with geodetic ribs
- Rendy's Micro Pod
- Full flying tail feathers

Vital
. Span - 40 in
. Area - 215 sq in
. Mass - 5.0 oz (5.4 oz after CG trimming)
. Loading - 3.6 oz/sq ft
. Airfoil - modified AG04 family
Posted by Geode | Jul 07, 2007 @ 08:19 PM | 31,836 Views
Build Thread - Hyperbolic Manta

Construction
- Manta DLG wing planform with reduced chord
- Hyperbolic wing bending
- Conventional balsa build-up wing with diagonal ribs
- SGII-like balsa pod with CF rod re-enforcement
- Full flying bagged tail feathers

Vital
. Span - 59 in
. Area - 361 sq in
. Mass - 8.0 oz (8.4 oz after CG trimming)
. Loading - 3.35 oz/sq ft
. Airfoil - AG04 family

Hyperbolic Manta DLG - Part I (2 min 1 sec)


...Continue Reading
Posted by Geode | May 26, 2007 @ 11:43 PM | 37,412 Views
Manta DLG Build Thread - http://www.rcgroups.com/forums/showthread.php?t=688041

Full size plan - http://www.rcgroups.com/forums/showp...7&postcount=51


Some Zlog data for late evening flying at Rancho San Antonio during April 2007 ......

Time - 7:10 PM, after sun set

The condition is like indoor, no wind and no thermal.

# of flights - 16
Min dead air time - 62.5 s
Max dead air time - 106 s
Average DAT - 79 s
Sink rate - 1.1 ft/sec

Manta DLG Maiden - Geode (1 min 55 sec)


...Continue Reading
Posted by Geode | Apr 15, 2007 @ 07:21 PM | 30,761 Views
Build Thread - http://www.rcgroups.com/forums/showt...=634100&page=5

Plan - http://www.rcgroups.com/forums/showp...&postcount=142

Construction Highlights
- Balsa shaping with templates (similar to "hot wire foam cutting")
- Geodetic ribs with Dbox
- Main spar - 1.5 mm CF rod / balsa / 1.5 mm CF rod
- LE - solid balsa Dbox; TE - ~ 1mm x 3mm CF flat

Vitals
- Span - 59 inches
- Planform: double ellipse; triple polyhedral
- Airfoil: AG12/13/14
- Mass: 8.2 oz
- Area: 336 sq in
- Loading: 3.5 oz/sq ft

Flight Test - Dead Air Time

# of flights - 17
Min dead air time (DAT) - 62.5 s
Max DAT - 120 s
Average DAT - 79 s


Bumblebee XL DLG - Part I (1 min 4 sec)


...Continue Reading
Posted by Geode | Feb 25, 2007 @ 11:23 AM | 28,402 Views
Build Thread on RCGroups - http://www.rcgroups.com/forums/showthread.php?t=634100

Overview Slide Show - http://www.rcgroups.com/forums/showt...31#post6987917



Planform - Double ellipse planform with geodetic ribs
Airfoil - AG04/08/09/10/11 transitional
Wing Span - 34 in
Area - 198 sq in
Weight - 4.1 oz
Loading - 2.98 oz/sq in

Dead air flight time statistics
# of flights - 7
Range of flight time - 39 sec ~ 57 sec
Average flight time - 45 sec

Launch height - 81 ~ 113 ft

Bumblebee DLG - Part I (1 min 26 sec)


...Continue Reading
Posted by Geode | Jan 20, 2007 @ 12:34 AM | 28,664 Views
General

XFLR5
- Official XFLR5 web site - http://xflr5.sourceforge.net/xflr5.htm
- RCSD tutorial - http://www.rcsoaringdigest.com/pdfs/...SD-2008-02.pdf
- DLG template - http://www.rcgroups.com/forums/showp...42&postcount=8
Basic aircraft design rules- http://ocw.mit.edu/NR/rdonlyres/Aero...1B1/0/spl8.pdf
CAD Tutorial - http://www.rcgroups.com/forums/showt...rhino+tutorial
General techniques & Tools - http://www.airfieldmodels.com/index.htm
Carbon D-box - http://www.airplane-model.com/tech-built-up-d-box.html
Scratch Building Review - http://winshiprc.tripod.com/scratch_...ng_reviews.htm
Hybrid balsa/foam wing - http://winshiprc.tripod.com/building_techniques.htm
Building Jig example - http://j2fduck.8m.com/photo.html
Planform Analysis
- RCSD Feb/2002, page #6 - http://www.rcsoaringdigest.com/pdfs...CSD-2002-12.pdf
- RCSD Dec/2003, page #12 - http://www.rcsoaringdigest.com/pdfs...CSD-2003-02.pdf
RCSD - On The Wing - http://www.b2streamlines.com/OTW.html
RCSD - Peter Wick PW airfoils http://www.b2streamlines.com/PWairfoils.html

Building / Design

Kanoh's Balsa DLG - http://model-sailplane.dialog.jp/original%20glider.html
Apogee - http://www.charlesriverrc.org/articl..._apogeehlg.htm
TMR DLG - http://www.tmrmodel.cz/graphito.htm
Geodetic Bumblebee - http://www.rcgroups.com/forums/showthread.php?t=634100
Manta DLG - http://www.rcgroups.com/forums/showthread.php?t=688041
Link to my other build-up DLG's - http://www.rcgroups.com/forums/member.php?u=30056

Products

Apogee Sport - http://www.flyecm.com/news/news.asp?newsid=11
Thermal spec DLG - http://www.thermalspec.com/
Apache - http://www.soaringusa.com/products/p...ategory_id=294
Photon II DLG - http://www.f3-modellbau.de/drupal_n/...e_cobra_dlg_en
D-Box DLG - http://www.espritmodel.com/index.asp...OD&ProdID=2854
Hobby Club - http://hobbyclub.com/Hcm-compgliders.htm

Misc.
Super Hawk - http://www.hobiehawk.com/SHconstPhotos.html
Free Flight buildup (kit review) - http://w-hobby.com/?p=Superba%20Model%20Kit%20Review
DLG links - http://www.tmrmodel.cz/links_dlg.htm

1Cell Lipo Setup - http://www.rcgroups.com/forums/showthread.php?t=1451555

Balsa Pod - http://www.rcgroups.com/forums/showp...8&postcount=47