Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 3 of 3

  1. #1

    Join Date
    Jul 2013
    Location
    Lisbon, PORTUGAL
    Posts
    34
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Talking Sukhoi - SU - 47 - 3D aerobatic

    Swept Forward Wings and 3D Aerobatic Flight

    Swept forward wing

    For some time I have this thought – Build and fly a swept forward wing rc plane.

    Swept forward wings have incredible performance at slow speed with high AOA (angle of attack) capabilities and are also very good at transonic and supersonic speeds. The wind tunnel results have demonstrated that.

    This is because of the even ‘cos – co-seno’ function. In theory, if it would be executable, the same exact wing, with the same angle, the Swept forward wing would be better than the contra part wing with the same angle of swept back.

    So, I’ve put my mind on it for some months ago and I’ve designed this aircraft which photos I also post. The photos were taken today, a cold Autumn morning.

    It has a simple way of vectorial thrust, like some of your planes. It does almost any 3D manoeuvre that you can think of, with a very good vertical performance. And, of course, it is also very forgiven and stable if you want to. Most of the times, I catch it by hand.

    The power system is the great secret for good low speed and high speed performance.

    The specifications are:

    Motor: Axi 2208/34 gold line;
    Propeller: Graupner 9” 6” Slim cam (exactly 9” 6”, not the smaller ones like you guys use. This is because the 9” 6” is perfect for acceleration from slow speed and high AoA and also have great behaviour at high speeds);
    Batteries: #1 Lipo 3 / 850 mA/h with 30C (also by Graupner);
    Speed controller: Jeti 8A (yes; just only 8 Amps, but this is more than sufficient. With this power system I can maximize my flight times – 10 minutes with 3D and Acro performance or plus 15 minutes with gentle use of the throttle stick (this is, if you can control yourself with this kind of machine ).

    The ailerons and the elevators are linked together by one carbon tube.

    Roughly, the dimensions are:

    Front to tail: 89 cm (overall length);
    Front to leading hedge of the wing: 46 cm;
    Wingspan: 66 cm;
    Leading hedge swept angle (wing): 65Ί;
    Wing trailing hedge swept angle: 55Ί;
    The outer far part of the wing is: 13 cm (with ailerons);
    Ailerons have: 8 cm;
    Elevator swept angle is: 20Ί;
    Dimensions of elevator (at widest point): 14,5 cm;
    Dimensions of rudder (at widest point): 18 cm tall by 13 cm wide (at the bottom);
    Weight: 320 grams or ~ 11 oz to ~ 12,5 oz range. Ready to fly (with this set up and battery).

    The front part is made of yellow ‘polypropylene’ that makes it almost, and I say ALMOST, indestructible .

    I hope that this brief description helps.

    It does not have any kind of KF airfoil simply because of weight concern.

    It looks great in the air and it’s guaranteed that you’ll receive all the attention of other RC fellow pilots!

    Josι Bernardo
    Lisbon, Portugal, Europe

  2. #2

    Join Date
    Jul 2013
    Location
    Lisbon, PORTUGAL
    Posts
    34
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback
    Below are some pictures:

    Click image for larger version. 

Name:	DSC02208 b.JPG 
Views:	7 
Size:	820.1 KB 
ID:	1959015Click image for larger version. 

Name:	DSC06078.JPG 
Views:	11 
Size:	4.21 MB 
ID:	1959024Click image for larger version. 

Name:	DSC02131.JPG 
Views:	6 
Size:	883.6 KB 
ID:	1959010Click image for larger version. 

Name:	DSC02133.JPG 
Views:	7 
Size:	822.3 KB 
ID:	1959011Click image for larger version. 

Name:	DSC02134.JPG 
Views:	6 
Size:	889.0 KB 
ID:	1959012Click image for larger version. 

Name:	DSC02137.JPG 
Views:	7 
Size:	857.9 KB 
ID:	1959013 Click image for larger version. 

Name:	SU 47 V2 JB KF airfoil.jpg 
Views:	8 
Size:	801.3 KB 
ID:	1959027Click image for larger version. 

Name:	SU 47 V2 JB Side View.jpg 
Views:	8 
Size:	800.3 KB 
ID:	1959028Click image for larger version. 

Name:	SU 47 V2 JB Top View Carbon Rods.jpg 
Views:	7 
Size:	809.3 KB 
ID:	1959029Click image for larger version. 

Name:	SU 47 V2 top view Dimensions Small.jpg 
Views:	7 
Size:	139.9 KB 
ID:	1959030
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC02131 com medidas.jpg 
Views:	9 
Size:	838.1 KB 
ID:	1959009   Click image for larger version. 

Name:	DSC02145 Lateral com medidas.jpg 
Views:	8 
Size:	790.6 KB 
ID:	1959014   Click image for larger version. 

Name:	SU 47 V2 top view Dimensions XSmall1.jpg 
Views:	9 
Size:	39.0 KB 
ID:	1959031   Click image for larger version. 

Name:	SU 47 V2 top view Dimensions.jpg 
Views:	8 
Size:	832.4 KB 
ID:	1959032  
    Last edited by jmrpb; 01-18-2014 at 08:54 AM.

  3. #3

    Join Date
    Jul 2013
    Location
    Lisbon, PORTUGAL
    Posts
    34
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback
    These are some aerobatic movies. Hope you enjoy it .





Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 07:00 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.