How do I flat spin

Stall model keeping nose up with full thottle and full up.

Initiate spin with rudder then feed in some opposite aileron. If you have enough movement, power and the CG is far enough back then it should flat spin.

It is also possible to get a flat spin if the fin area is too small [ I am told ]. Never had it happen to anything I flew but there are full size aircraft which can be made to flat spin and it may be difficult to get back to normal flight.

Lots of Beer,,, oh wait flat spin. not room spin.

What kind of airplane are you wanting to spin?

Full power
Full left rudder
Full up
Full left aileron.
When the plane stabilizes in a full power spin, slowly, holding everything else, move the ailerons over toward the right.
Watch the plane and you should see the nose raise up. The spin will look different from a normal spin, even though it will probably not get actually horizontal. This is a flat spin mode.
To recover, release the controls. In extreme cases, put in opposite rudder after releasing.

Most of your 3D profile planes are excellent flat spinners. It's got more to do with the plane than it does the pilot. Low wing load, high power, aft CG and lots of rudder command will get the job done. Once you start playing with a plane like this, get it way up there and give it a try.

I like:

Nose down into downline.

Full aileron to initiate fast roll.

Then pull hard up and hard rudder...

Instant and FAST flat spin.

Positive flat spins to the right don't usually work as well, or at all, because gyroscopic precession raises the nose when yawing left, and lowers the nose when yawing right. This is the flight condition where gyroscopic precession is most noticeable.

My personal preference is to start the spin without aileron, then feed it in as I increase power.

Have to pull throttle back to half to get it to stall, as the electric Twist 3D will just keep on snap rolling. Once it's in, I back off ail to neutral and el. to neutral and it flattens right out. Throttle speeds up or slows down the spin rate.

If your plane is light enough, powerful enough and set up design wise for 3D, the question of how to do a flat spin doesn't need to be asked, the plane will show vou. The best flat spins are usually with the plane set up with flaperons coupled against the elevator. Some planes do them better inverted, some do them better upright.

Yes to the better inverted.

My MH Sledge would do a climbing flat spin inverted. Upright it is a slow los of altitude.

It is a mystery because I've flown similar designs where one favored up right spins, the other inverted. I would think a low thrust line [wing high] in the spin would increase lift.

I have an 80" model similar to a Laser 200 that will flat spin very much like a full scale aircraft. It must be done to the left, upright with full power, once it goes flat apply full down elevator and it starts spinning FAST. It takes three to five rotations and 30- 40 feet to recover. This is the only model that I have flown that will go flat and spin like a top.

Next time I'll try that down elevator bit. sounds good.

I have had 2 different trainers I set up to do flat spins. Moving the CG back, and getting as much rudder and elevator as possible were the key parts.

On the trainers, most of them have so much down-thrust that you can't spin them at full throttle, the engine pulls the nose down and out of the spin, so it has to be done at idle. Playing with the throttle a little in the spin can sometimes find a "sweet spot" where the nose comes up a bit more, but it's still not enough to pull the plane out.

Adding rudder area and reducing vertical stab area helps a lot as well. I did that to one trainer and the spins were quite impressive. It would take about 4 rotations to exit a fully developed spin if you just released the controls. A bit of opposite rudder and down elevator stopped the spin quickly.

Anyway, the point burried in there is that the engine thrust line can play a part in how a plane spins.

I have an old 1/4 scale Corby Starlet. The first time I put it into a flatspin it took about 200 ft. to get it out with about 20 ft. left. After I wiped myself I found if you only let it do three turns before it tightened up it would come out fine with down el. and opposite rudder.

Getting in was not my problem. I guess getting out wasn't either after I hit the ground. Now I am a little nervous about trying it again. I just get it vertical and stall it while at the same time throw the sticks together in the top corners. This is with a wild wiz. I think they are known flat spinners.

Hey guys I have a stick like model that will only spin about 45 degrees nose up. It balances about 35% and snaps out of a loop at 1/2 elevator. It will do a flat turn, rudder, opposite aileron effortlessly, so my question is can this plane be made to flat spin? How much rearward CG can one safely fly with? Is short coupling more desireable or does it not matter?

Length of tail alone cannot tell. Size of rudder and elevators is more important.

You, as the pilot, are in the best position to tell us whether your plane will flat spin or not. Try some of the techniques listed. A common full-scale way to enter a flat spin (because it produces consistent results), is to enter a normal, power-at-idle, upright spin to the left, with ailerons neutral (or negative spin with right rudder), then, after a turn or two, smoothly increase power and apply right aileron simultaneously until the nose comes up and the rotation rate decreases. If this technique doesn't do it, try some others. Factors affecting spins are many and complex, and nobody fully understands them all (otherwise flight testing would not be necessary), so it can seem like an art at times. Sometimes a seemingly very small change can have a dramatic effect on spin characteristics.

There are some generalizations that can be made: Side area ahead of the CG is "pro-spin" (aids spin entry/hinders recovery), or destablizing. Area aft of the CG is anti-spin (hinders spin entry/aids recovery), or stabilizing. Fin/strake/dorsal area below the horizontal stabilizer when upright, or "above" the horizontal stab when inverted, is anti-spin. If a plane has sufficient rudder and elevator authority, and a sufficiently rearward CG, then aileron application is not necessary for spin entry, but it affects spin characteristics, sometimes dramatically. Planes tend to flat spin better to the left, because of gyroscopic precession. Planes with low thrust lines tend to flat spin better upright, and the opposite is true for high thrust lines. All these effects are interdependent and one or more can override others.

A few airplanes that can be made to spin, cannot be made to recover from the spin. And some airplanes that cannot recover from upright flat spins, or can recover with difficulty, can recover easily from inverted spins, like the F-4U. An examination of the empennage in the context of airflow from "below" compared with "above" will reveal the primary reason.