Henning

I noice the your battery are furthe back than mine with a Axis motor. But they are also further bach than another Addiction here in Va. What battery and speed control are you useing?

Jr

Dag:

Thanks! Will you go electric this season?


Jr:

Plettenberg 30 – 10 Evo, Schulze 32.80KA and Hyperion G3 5Ah 25C

I have scratch built a new rudder which saved me 40 grams and have a std size servo up front with pull pull wires to a MK bell crank.


Henning

Hi Henning,

Re electrics, idont know, I donot trust my 2,4 system anymore and 35mhz will be very risky to use with electrics I suspect.

Regards

Hello Henning

Congrats on your maiden flights !
I have also made a very light rudder, and even though I have two servos for the elevator in the tail my batteries are almost as far back as yours.
Of course then, my Axi is much heavier.... :-(

I have now added a rather large T-canalizer, I will test it in few days. Hope to improve the fuselage sideforce for manever #1.
Having flown a bipe for the last few months, I am used to the rudder being almost as responsive as the elevator ....

Your incidence numbers, what are they relative to ? Wing slightly positive ... relative to what ... the molded line on the fuselage ?

Oistein

Thanks Oistein!

My incidence numbers are relative to the centre line from the original drawings by Starcraft. The front of the fuselage has zero degrees angle to the centre line. I have adjusted it down by one degree. The Addiction by Starcraft has -2 degree down trust.

The moulded lines on each side of the fuselage are off by more than one degree relative to each other on my plane so they are useless.



Henning

Henning, would you please take some pictures of your pull-pull elevator setup and post them on this tread? I am interested in seeing the layout. Thanks

Air Surfer: I’m using the same method as Ola Fremming.

http://www.ofremmi.info/HowTo/MK_Dua..._pull_pull.htm


Henning

Thanks Henning.

Hi again,

I managed to get in 16 flights last week (for me this is a lot ...!) with my new Addiction. After som minor adjustments I think the basic setup is now completed.
The model performs very well, and has a very locked in and neutral behaviour. In fact I have no mix at all, except for a few % low throttle to down elevator.
My final settings are like this : Wings aligned with molded lines on fuse, stabiliser -0,7 degrees relative to wings, motor downthrust -1 degree relative to the front of the fuse.
That means that I adjusted the motor -1 degree down compared to what the instructions says..... With this setting the plane goes the perfectly straight in the verticals at all power settings.

The CG at 168 mm from the LE seems to be a good choice, at least mine follows 45 degree lines very well and needs only a little push when inverted.

Henning :
The molded fuse lines on my model seems to be aligned, I have absolutely no aileron trim when using these lines as a reference.

BTW: I have added a rather large T-wing right behind the canopy, and the "rudder to sideforce" response increased significantly. I like this mod a lot, making P11 #1 somewhat easier.
Also, my modified balsa rudder has the same thickness at the hinge line and trailing edge. I usually fly with approx -40% expo on rudder, but with this rudder this had to be reduced to about -5%.
Hard to explain but I like the damped feeling of this rudder, making corrections look less "nervous".....

Regards
Oistein

Alright, I think we're done[sm=idea.gif]!!! After putting in 1 degree positive trim in the wings and 1 degree down in the thrustline and 1 percent down elevator mix to low throttle ( I'll probably take it back out).............. We have a winner!!! No mixing necessary other than what I just stated. I am soooooo loving this airplane!!! After I program myself to keep my hands off the sticks so much and "just trust the plane", I may even become a competitive threat once again(ha-ha-ha!)[sm=punching.gif].

Seriously, with the Plettenberg 30-10 EVO as the engine of choice along with the YGE 80 HV ESC and a 20.5 x 14 Rasa or APC prop (the 21 x 15 folding Rasa's are still growing on me) I really, really like what I'm seeing [sm=tongue_smile.gif] I think we'll take some time to become better acquainted before we make our debut on the contest trail.

Appreciate all the good advice and inputs from everyone. See ya soon on the contest trail.

Oh yea, the AUW is 4904 grams/ 10 pounds and 13 ounces.

The Addiction by Delro is now my A – model again after the front of my Aries 07 went up in flames at the WC in Muncie this summer. To be honest I have from the first flight of the Addiction felt it was a bit nervous and unpredictable in turbulent air. I have thought about building new wings with a thicker airfoil but that is a lot of work so I thought I would try one thing first and that is to add turbulators to the wing. The turbulator do the same thing as the bumps on the surface of a golf ball. It makes the boundary layer turbulent which makes the air pass over the airfoil and follow the curve without separating. If you have ever flown in rain or realy humid air you probably have felt the wings feels heavier and more stable? The turbulators let you have the same feeling. The turbulators I use are made by Graupner and was bought from Lindinger in Austria. If you have the right tools you can probably make you own. The thickness of mine is 0,4 mm and are applied just like a sticker.

http://shop.lindinger.at/advanced_se...+5LFM+GRAUPNER

Now the Addiction just flies fantastic. Adding turbulators are the cheapest and most effective upgrade I have ever done to a F3A model.

You can see the turbulators as the white corrugated strip at the front of the wing. I have them on both sides of the wing.


Regards,
Henning Jorkjend

Henning,

I've tried to get the English translation for the description , price and catalog # on the Graupner site .
Also searched the German name - no luck.

Thanks,
Frank

The zig-zag tape is applied to improve the flight characteristics of a model aircraft. This turbulent flow is generated. A stall occurs against a laminar flow or not much later. Width ca.9 mm, thickness about 0.4 mm, center distance of about 6 mm, 60 ° angle teeth.

Zackenband is on the Graupner site:
http://www.graupner.de/de/products/8...1/product.aspx

Flying an Addiction myself, maybe I should give that a try too.

What I currently struggle with is that the Plane slowly rolls to the right in inverted flight. It's marginal but it's there. Any idea what could be the source for this? I noticed that my rudder has to be slightly off center for normal flight (trimmed to the right) but side thrust seems correct. (no corrections needed in vertical upline). Also checked that elevators are aligned and travel the same way.
Good ideas for reasons are welcome ....

Best,
Malte

Edit: Ups, uploaded the same pictures twice....

Hallo !
The turbulator device is really interesting to say at least and I'm surprised to hear it makes a noticable difference as I thought that the airfoils we use are much less critical in boundry layer separason compared to gliders and pylon racers.If that's the case I have a suggestion for Henning.It seems like you have put the turbulator parallel to the LE of the wing ,this means that it doesnt meet with the foil at the same chord percentage from root to tip.Theoreticaly there is an optimum position ,lets say20% (that would be my wild guess as for laminar flow in our foils).If the root and tip share the same foil I would put them in the same chord percendage.If it made a noticably difference with the parallel LE setup , it would make even more with the %setup.
Worths a try for sure !

MalteS ,
rolling tendency in inverted flight suggests that the wing you see droping every time you are inverted is heavyer that the other , led weights in 5gr increments at the oposite tip fixes the problem )
You have to check for rudder position at the beggining of a vertical and side thrust at the end.If you have too much power and the plane does not slow down in vertical (nothing unusual theese days ) go with bit less throttle .
Now I have to go and make me some turbulators ! maybe from aluminum sheet...
I'll keep you posted !
Elias

Hi Elias,

Turbulators have been discussed before and it seems that a strip of velcro works really well, as suggested here:

http://www.rcuniverse.com/forum/m_92...tm.htm#9221914

You can find all the relevant dimensions lower on the same page.

Rolling while inverted is usually a heavy wing problem. If a wing is heavier than the other, the trim required to make the plane fly straight will work the other way round while inverted. Not only will the heavy wing roll the plane, the trim will make the problem worse. This also applies to a warped wing.

Thanks for the link Alex ,very interesting ,compliments to the inventor !
Jon ,if you mean that a warped wing acts the same way as the heavyer tip inverted,I have to dissagree as a warped wing will roll the same way right or left either straight or inverted.Unless I missundertood your statement..
Elias

Elias: I have thought about the different percentage and I actually don’t think it will make a big difference. As long as the turbulators are not too close to the LE and not to close to the highest point of the airfoil it’s probably ok. On a well-designed airfoil designed for a glider it probably will be more critical where the turbulators are located.

If the wingtips had been 12% as the original Addiction by Starcraft instead of 9.5% I would probably not have used the turbulators.

Henning

Sorry I wrote before thinking (again!) I meant not warped, but if you have adjustable incidence on the wings and the incidence is slightly different, when you trim this out for normal flight that trim becomes inverse when flying inverted. This can be measured of course, a difference in wing weight is more likely.

I can see your point Henning
Another general rule would be to use the turbulator towards the front if you want to keep the boundry layer at high lift coef. eg high angle of attack (with a penalty increased drag on cruise speed)
or place it further back to work better at low lift coef. (straight and level at cruise speed) with less drag but no effect at high AOA.
I will place mine a bit further back and report the results..
Nice...!
Elias

Well, the velcro strip tubulators didn't work for me... I tried them yesterday and noticed that it needs 2 clicks of up trim and the model was less stable in roll axis.
Didn't see any improvements in other areas, so i will definitely remove the turbulators. The velcro i used seems a little too "dense" so maybe it works with a different type of velcro.