Matthew Sanders
Elite member
Ok, thanks. I'll be using a 2200 3s
Ft viggen group build!
- Thread starter The Hangar
- Start date
Matthew Sanders
Elite member
So, do you like my signature?
Haha - I love it. It’s great!
Matthew Sanders
Elite member
Do I get PROPS for that? 😄
buzzbomb
I know nothing!
That will be better, as I had to add some nose weight to mine. Plus, It’ll give you linger flight times, as EDF’s really suck the power! I’d recommend setting a timer to 3 or 4 min. then landing and checking the voltage. @Headbang and @Hai-Lee could give you better tips I’m sure, since I’ve never used an edf myself. I’m just passing on what I’ve read.
No, unless you count the fan itself a prop! 🤣🤣😂😂
Matthew Sanders
Elite member
Ok, thanks! I'll set it to 3 and 1/2 minutes!
BATTLEAXE
Legendary member
INVERTED like a BOSS. Nice maiden, flew awesome, almost floaty.
I know the Viggen has a 10 or so degree of positive angle of attack in the canards, correct me if I am wrong, But I heard from others who have flown the Viggen and judging by you flight, it has a lot more roll then pitch authority. I am wondering how it would fly if the elevator was on the canards and the wing surfaces were just ailerons
Matthew Sanders
Elite member
You're correct, the build video says 10 degrees of pitch on the canard. That would be cool if someone tried to make the canards as elevators.INVERTED like a BOSS. Nice maiden, flew awesome, almost floaty.
I know the Viggen has a 10 or so degree of positive angle of attack in the canards, correct me if I am wrong, But I heard from others who have flown the Viggen and judging by you flight, it has a lot more roll then pitch authority. I am wondering how it would fly if the elevator was on the canards and the wing surfaces were just ailerons
Headbang
Master member
As a 70mm edf, a 4s-6s 3300mAh is generally the sweet spot.
BATTLEAXE
Legendary member
I watch a few vids on the engineering of plane designs once in awhile and I just thought of it when I watched @The Hangar maiden. I haven't heard of anyone doing it to the Viggen yet. I wonder if it would even out the roll/pitch ratio some. I myself haven't flown with canards before
Thanks! You should try and seeINVERTED like a BOSS. Nice maiden, flew awesome, almost floaty.
I know the Viggen has a 10 or so degree of positive angle of attack in the canards, correct me if I am wrong, But I heard from others who have flown the Viggen and judging by you flight, it has a lot more roll then pitch authority. I am wondering how it would fly if the elevator was on the canards and the wing surfaces were just ailerons
Headbang
Master member
Short answer "no". The canards are there to stabilize and there is no advantage to doing anything with them unless you have them adjustable to mix in with different flight conditions. The viggen flies great without modification. I did cut you a second wing to use as a doubler if you want for added strength.
BATTLEAXE
Legendary member
Thanks man, I appreciate it.
So we'll have yet another viggen coming in the near future?! This is great!
Oh yeah! The edf will be awesome! Just think landing in the snow and sending a spray of snow out of the back of the fan - that would be an epic sight!
Hai-Lee
Old and Bold RC PILOT
On a canard the foreplanes provide the same wing loading as does the main wing in level flight, (this is per unit area of course). If the area or the angle of attack of the canards is varied then the CG or balance point will be effected. The good thing about canards is that they are effectively stall proof in normal flight.
When the plane slows the idea is to have the canards stall before the main wing thereby pitching the nose down and avoiding main wing stall. With varying pitch canards it is possible if too aggressive to induce main wing stall first and then recovery can be almost impossible. Yet another thing to remember with maneuvering foreplanes is that they can stall at high up deflections as well which normally gives a sort of control reversal and the nose drops anyway. Combine this stall of the foreplanes with the main wing lift dumping to try to change the pitch angle to nose up can result in a rapid pancake on the runway at the end of a low and slow speed pass!
You can make the foreplanes work in unison with the elevons with the use/addition of just 2 extra servos and a couple of "Y" harnesses so that the port foreplane operates in opposition to the starboard elevon and of course the same oppositional movement between the starboard foreplane and the port elevon. It does work well but keep the foreplane deflections to moderate to avoid some nasty handling issues!
The roll and pitch responses are very different on the Viggen, (rolls are rapid and the pitch changes are somewhat sluggish). Changing the mix ratio is encouraged after you have flown the bird in the original setup. Finally the bird really LOVES to have excess power. Under-powered is stumbles around the sky and maneuvers can be poor but add some serious power and the thing is a rocket with some serious performance!
have fun!
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