Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Nov 03, 2012, 06:01 AM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
Discussion
Flying wing with landing gear

Finished the prototype: http://www.rcgroups.com/forums/member.php?u=271334

Before building the FZ3, i decided to build a prototype first, as there will be a few differences with the FZ2.

The PT is build from 3mm depron, glas covered and painted wih "RC colors", 4w HET motor, 3cell. Sizing of the PT is made as such, so that the cubic wing loading is the same as for the original FZ3. Aileron and flap are resized in order to have a representative flying experience as would be with the FZ3.

I simplyfied the front wheel, it's more like a skid, not streerable, just to find out if it is possile to take off with this odd setup (cg in the center of the 3 "feet" and the winglets-feet being far behind the cg).

I made some attempts to make the skid a retract with a servo, but the forces are huge during takeoff, the frontskid itself and also the servo broke on several occasions. Decided to have a front skid without retract. This turned out fine, the wing has to make a nice speed, before it's able to takeoff. This is due to the odd setup, the wing cannot be tilted to catch more air. The skids are designed to have the wing at an angle of attack of 6° during takeoff.

Having 30° of sweep, with winglets upside down, showed me that the wing is stall prone at low speeds, especially during landing: the ailerons lack authority at low speed. In order to keep the design clean, I decided not to add top winglets, but installed fences instead. These should be a able to limit the spanwise crossflow, which induces the stall behavior. Yet to see if this change turns out as expected.
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Last edited by vincent123; Nov 03, 2012 at 02:09 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Nov 03, 2012, 10:04 PM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
1,592 Posts
Seems to me that the winglets could be shorter, or moved upwards, so that the AOA on takeoff would be increased.
Also, some washout on the wing would slow down the stall speed.
djacob7 is offline Find More Posts by djacob7
Reply With Quote
Old Nov 04, 2012, 01:52 AM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
Yes, first i tried to have less clearance between prop and gras, but then i had a fast lawnmower

So now the clearance is 30mm.
I ll try washout the next time

Vincent
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Old Nov 04, 2012, 06:02 AM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
3,150 Posts
How about trying C shaped wire skids.The spring in the wire may save the servo,and they shouldn't effect the handling?Washout sounds a good idea.
Stuart
Stupot46 is offline Find More Posts by Stupot46
Reply With Quote
Old Nov 04, 2012, 08:03 AM
I'm overcoming gravity!
Murman's Avatar
USA, NC, Huntersville
Joined Jul 2008
3,808 Posts
Other than having something different, why do you want landing gear on your wing? Without a rudder, you have no way to steer the wing while taking off. I've had many wings over the years, and the only reason I could see for landing gear is when I didn't have a clear, smooth place to land other than pavement which would damage the wing. I have attached small skids to some of my wings so I can land on pavement without damaging the motor, or the wing itself.
Murman is online now Find More Posts by Murman
RCG Plus Member
Old Nov 04, 2012, 12:46 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
Quote:
Originally Posted by Murman View Post
Other than having something different, why do you want landing gear on your wing? Without a rudder, you have no way to steer the wing while taking off. I've had many wings over the years, and the only reason I could see for landing gear is when I didn't have a clear, smooth place to land other than pavement which would damage the wing. I have attached small skids to some of my wings so I can land on pavement without damaging the motor, or the wing itself.
The plane runs in a fair straight line before taking off, although it indeed tends to bend to the left, but that's ok.

The PT is a Prototype for the wing i'm planning to build, the FZ3.
It'll be double the weight and tripple the power, it will be hard to hand throw it, so that's why, and besides that, it's just cool to takeoff from a runway
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Last edited by vincent123; Nov 04, 2012 at 03:47 PM.
Reply With Quote
Old Nov 06, 2012, 12:36 AM
Never trust laughing dolphins
Joined Feb 2011
2,085 Posts
Looking great! I'd probably try to keep the gear smaller, can it fold in?
PHMX is offline Find More Posts by PHMX
Reply With Quote
Old Nov 06, 2012, 10:08 AM
New in the game
Remko's Avatar
Nederland, ZH, Capelle aan den IJssel
Joined Feb 2011
126 Posts
Quote:
Originally Posted by PHMX View Post
Looking great! I'd probably try to keep the gear smaller, can it fold in?
Look at the first picture...!!!
Remko is offline Find More Posts by Remko
Reply With Quote
Old Nov 06, 2012, 01:46 PM
Never trust laughing dolphins
Joined Feb 2011
2,085 Posts
Quote:
Originally Posted by Remko View Post
Look at the first picture...!!!
My bad, overlooked that one. Definitely a neat solution.
PHMX is offline Find More Posts by PHMX
Reply With Quote
Old Nov 09, 2012, 11:26 AM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
1,063 Posts
very clever. This could be a great way to do fpv takeoffs with my wing, so I don't have to take off the goggles, throw it, climb, then put them on again.
baconflyer is offline Find More Posts by baconflyer
Reply With Quote
Old Nov 12, 2012, 02:36 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
Finally, some footage of a takeoff.
Flying Wing With Landing Gear (1 min 48 sec)
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Old Dec 29, 2012, 03:25 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
Starting the FZ3 build

Based on the FZ3-Prototype experience, the time has come to start the real thing.
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Old Dec 29, 2012, 03:27 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
FZ3 build

Wing spars glued
Wing cut in 3 pieces for webbing spars.
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Old Dec 29, 2012, 03:28 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
FZ3 build

Webbing spar leading and trailing edges.
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Old Dec 29, 2012, 03:29 PM
InceCreations
vincent123's Avatar
Joined Jul 2009
665 Posts
FZ3 build

One wing-half ready for sheeting.
Wing will be sheeted with 1mm balsa and glassed (instead of only glassing).
vincent123 is offline Find More Posts by vincent123
RCG Plus Member
Latest blog entry: ZDelta: it flies !
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
V-Bat Flying Wing- Needs Landing Gear Ideas babenson Flying Wings 5 Nov 13, 2012 04:31 PM
Discussion 47" WS Flying Wing with Landing Gear villapilote Flying Wings 10 Oct 20, 2012 04:28 PM
Discussion Scratch build flying wing with landing gear vincent123 Flying Wings 3 Aug 22, 2012 12:27 PM
For Sale Flying Robot 550 frame with pan landing gear + multiwii Warthox board. airbagit13 Aircraft - Electric - Multirotor (FS/W) 7 Apr 18, 2012 01:47 PM