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Jul 03, 2019, 08:56 AM
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EdSoars's Avatar
i was thinking of building a similar wing, but smaller than 100", and naming it, can you guess?

Yep. The Disparitty.

It is interesting, how these low-sweep-angle wings fly so nicely in the zone between true planks and true chevron plan-forms. I can't imagine the mathematics of that territory. Just goes to show how well we can get along without those pesky horizontal stabilizers!
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Jul 03, 2019, 01:24 PM
a wing is enough
Tail Saw's Avatar
Originally Posted by Stuart A
Does the name imply some sort of special spar system?
No, as Stuart has notet the name is part of the latin name of some flying insects, in this case the european butterfly Lycaena dispar:

But the name also implies a disparity of the same plane. The regular Dispar is a back swept flying wing with a span of 3 m / 118" and 25-27 ° sweep angle of the outer wing:

The Dispar Mini is a back swept plank type wing with a span of 2,5 m / 100", central rudder and 11-13° sweep angle of the outer wing.

Both outer wings come from the same mold with different center sections.

You know the 100" Dispar mini video above, here ist the regular 118" Dispar with absolut the same outer wings plus winglets:

(4 min 28 sec)

Ed, if you are interested in building such a swept plank, please take a look at the 35" BOW,
the aerodynamic data are public, but the detailed information unfortunately in German:


Jul 05, 2019, 11:26 AM
Registered User
EdSoars's Avatar
Thank you, Uwe. The Google translator isn't perfect from German to English, but it IS entertaining!

The BOW certainly performs much like my "dream", that is, predictable, smooth handling, fun aerobatics, and good speed and L/D, however, I will be using much more primitive designing and building methods. I will continue to post on the Max Plank thread, with thoughts about optimizing the compromises between building time, $$ budget, and flying conditions.
Sep 19, 2019, 10:44 AM
Registered User
now i can show you a Video from the maiden of my 3,3m Nurflügel (Res-Dart XXL )

at the 22. Nurflügelmeeting Germany

with to much elevator throw

Wing is al Wood except the Wing Joiners
Flying weigt 2250 Gr. (79,4 OZ) Wing Area 10,7639 sq.feet
Motor Reisenauer Peggy Pepper 2410 5: 1 Gear
3s 2800 mAh
Prop 18x10 Graupner

3,3m Nurflügel Res dart xxl (2 min 6 sec)

Wing is 4 pieces and easy to tranport

Thanks to Thomas and Uli for help and Video

Sep 19, 2019, 01:05 PM
Lost in the Sky
Richard N's Avatar
More about Jürgen's Res-Dart XXL on the German site:
Sep 19, 2019, 01:11 PM
Old Schooler
llamame1950's Avatar
Sep 22, 2019, 07:34 PM
Registered User
hog2soar's Avatar
Scratch built from Thermalplex.
Sep 22, 2019, 08:50 PM
Old Schooler
llamame1950's Avatar
Sweet! What is Thermalplex?
Sep 23, 2019, 02:25 PM
a wing is enough
Tail Saw's Avatar
Curst light (34 g /dm² ) an Mocasin (50 g/dm²) together at the slope



(4 min 7 sec)
Sep 25, 2019, 08:23 PM
Cant fly enough
Greg Beshouri's Avatar
Originally Posted by Tail Saw
Curst light (34 g /dm² ) an Mocasin (50 g/dm²) together at the slope


Really nice flying and super music. ELP is obscure enough. Few know their music beyond "Lucky Man"!
Sep 25, 2019, 09:50 PM
Registered User
EdSoars's Avatar

Farewell to Summer

Setting up for three hours of fast-moving flight in perfect late summer conditions. Max Plank on left, PsiClone on right. PsiClone is inspired by Uwe Heuer's Strong Mini Slim. Thanks Uwe, for your many posts of high-performance planks in flight! The PsiClone flies beautifully: fast, nimble, efficient, and no bad habits.


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