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Jan 05, 2017, 09:18 AM
Registered User
Hi Uwe!

I am very glad that Richard posted his experiences and his great pictures in this thread. I think Richard is no competition pilot and that´s why he is not so focused on getting an ultralight plane. For example he used a Oracover signalorange flour. to cover the winglets. That means 8 g more compared with transparent red Oralight and a lot of extra ballast in the nose of the fuselage. For information: http://www.oracover.de/downloads2/da...engewichte.pdf
If you know, it is necessary to work very consequent to get a lightweight plane. If you only take the wrong servo-extension-cables you ad 15 to 30 g extra-weight. Res-darts I know, completed from competition-pilots in Austria, made from the same kit, fly with weights between 506 and 540 g.

kind regards

Franz
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Jan 05, 2017, 10:08 AM
a wing is enough
Tail Saw's Avatar
Quote:
Originally Posted by resdart
Res-darts I know, completed from competition-pilots in Austria, made from the same kit, fly with weights between 506 and 540 g.
Hi Franz, Richard wrote that he was not careful with the weight of his RES-dart, but in USA the 2 m RES-class with the German rules is new and I think it is fair to give the guys outside of Germany and Austria some missing informations from our competition experience of the last 4 years.

I had always problems with the weight of the ARES-series. My competion versions with selected, lighter balsa for sheeting had 540-570 g and won several rounds in competitions, the serial planes had 640-670 g and won nothing, but fun in thermal and slope flying for their pilots outside the competitions.

What was the weight of your RES-Dart at the video from Jaro?

I think the RES-dart has more lift at hi-start than the ARES and gets the better hight and I think it is easyer to build it light enough to be competitive, but if a RES-dart with > 600 g wins a round in competition it can be just a coincidence.

Regards,

Uwe
Jan 05, 2017, 11:41 AM
Registered User
Hi Uwe!

You are right, more than 600 g are nice to fly but not competitive at the German 2 m Res-class. If there is a little wind also the 600+ g wing will reach a good height, but without wind it would be difficult. As I wrote before, there are already existing some res-darts with between 506 and 540 g made from the Res-dart kits. I think that are very good weights for a wings with nearly 1/2 m2 . The video shows some of my very early flights with res dart. At the beginning of the video the weight was 470 g , later I added about 5 g lead. I think to reach 500 g is realistic without doing any kit-modification, specialists are already on the way to less than 500 g by using the kit.

kind regards

Franz
Jan 05, 2017, 02:58 PM
Lost in the Sky
Richard N's Avatar
Uwe,

From information I received from Franz and going back over my build, I think most of my extra weight came from using standard weight servo extensions since there are about 2 meters of them. I used what I had on hand and used pairs of 5 and 9 gram servos where the Dymond servos would have saved weight.

I bought 2 RES-Dart kits and can use what I learned to improve the second one.

If you will provide me with airplane tickets to get from Texas to Germany to fly at your RES competitions, that will give me a great incentive to build a much lighter RES-Dart

Richard
Jan 25, 2017, 09:48 AM
Registered User

RESdart Manual


Richard ,
I got my kit after I got home from having open heart surgery. But there was no manual. I would greatly like to see your English version. And yes google doesn't translate very well. Thanks in advance.

Pete
Feb 03, 2017, 07:56 PM
Registered User
I saw the electric version. Very cool. Any chance of getting some construction updates Or pictures for the conversion? Mine is still in the box. My doctor won't let me climb our steps yet. Maybe in a couple weeks. My workshop is in my basement.
Last edited by PDARR; Feb 03, 2017 at 09:09 PM.
Feb 04, 2017, 01:41 AM
Registered User

e-version


Hi Pete!

A fuselage for a 28 mm outrunner will be available the next few weeks.

I hope you get well soon

Franz
Feb 04, 2017, 02:12 AM
Registered User
Hi Pete !

Quote:
Originally Posted by PDARR
Any chance of getting some construction updates Or pictures for the conversion?
Here to compare, a few pictures.

Jaro
Feb 04, 2017, 03:55 AM
Registered User
Thanks Jaro!

Jaros pictures show the fuselages of the handmade prototypes. The main differences are visible: shorter front and longer tail to get the correct CG. The prototype-fuselage was constructed for a 22 mm outrunner, the kit version will use a lightweight 28 mm outrunner which achieves about 120 Watt.

kind regards

Franz
Feb 04, 2017, 04:13 AM
Registered User
There is such low kv outrunner for 22mm too, a sleeper not so known, nor popular, no ideea why.
adh300l by AEORC, 39g, 1100kv, 15A, 170W max spec'ed values.
In real tests the best thrust was 592g, 3s, 9x4.7 prop, 10.8A / 120W, 6970 RPM.
Feb 04, 2017, 06:45 AM
Registered User
Hi Renatoa!

At the prototype we use the art-hobby 500, 32 g, 1340 kv, 8/4,5 prop, 3S 350 mAh and about 9 A. With this combination a 540 g Res-Dart needs between 23 and 27 s for 90 m. That is a little to close to our time limit of 30 s for 90 m. So we decided to provide the power options of 28 mm motors.

kind regards

Franz
Mar 05, 2017, 09:39 AM
Registered User
What is the length of the root chord on the RES-Dart?

Alternatively ... is there a datasheet somewhere, perhaps?

Regards-
Dave
Mar 18, 2017, 08:09 AM
dare to thermal
impressive new video:
GOPR0694 (0 min 36 sec)
Mar 18, 2017, 09:44 AM
less is more
Knoll53's Avatar
Apparently flown in the absolute calm of early morning..................no slope lift there!
Impressive indeed.
Mar 18, 2017, 04:52 PM
Lost in the Sky
Richard N's Avatar
Quote:
Originally Posted by Cap_n_Dave
What is the length of the root chord on the RES-Dart?

Alternatively ... is there a datasheet somewhere, perhaps?

Regards-
Dave
The root chord is 9.75 in (247.65 mm). Technical Data is on page 2 of the manual: https://www.dropbox.com/s/p3a6mlbydc...tuell.pdf?dl=0

Technische Daten

Spannweite: 1,920 mm
Abfluggewicht: 500 bis 600 g
Flächeninhalt: 47 dm²
Flächenbelastung: 10,6 bis 12,8 g/dm²
Wingletprofil: ebene Platte
Pfeilwinkel: 22° V-Form:-1°/Seite
Steuerung: Quer, Höhe, Spoiler


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