Hello,

I'm posting this here because I can't figure out where it should be posted. I figure it will get moved appropriately then I'll know.

I need someone to tell me how to do a flat spin. I'm flying a Venture 60 balanced as per instructions. When I do what I thought was the right thing to induce a flat spin I just get an ugly spiral. Would somebody please clue me in? I hear this plane is supposed to do nice flat spins, but I guess it isn't automatic.

Some planes like to do them, and others don't.

First, increase your rudder throw to the MAX.

Next, being a little tail heavy doesn't hurt.

Start HIGH!!!! Go into a loop, and as the plane reaches inverted, push both sticks toward the antenna.

That alone is enought to do it with some planes, but most will now need a "Ballet" of sorts between the aileron and throttle. Try slowly feeding in right aileron, or decreasing the throttle, or both.

Eventually you will either find the right combination, or you will find that your plane just doesn't want to do them.

Upright, up high come to a near stall and star a spin, (sticks bottom left corners) bring up the throttle to full keeping in the rudder and slide the aileron over quickly to center, then feed in opposite aileron to flatten the spin. As much elevator throw and rudder throw as you can get. Planes with long tail moments and small control surfaces will never get real flat.
Inverted you can follow minnflyer's advice, high sticks to the middle after pointing the nose down and slide the aileron over

Here is another VERY EASY WAY to do the inverted flat spin. Take the plane straight vertical, go up a ways. Back off the throttle to idle. Just before she starts sliding backwards, take the rudder/throttle stick to the lower right corner and put the ele/aileron stick in the upper left corner.

At this point you are full down elevator, full left aileron, full right rudder and NO throttle . This will start the inverted spin. Let it go for a couple of revolutions then make it flat.

To make it a FLAT spin, start adding throttle AND creeping the ailerons over to the other side . How much throttle and opposite aileron is up to you and the plane. Leave the rudder all the way right and the elevator shoved forward. If it is capable of a flat spin, it will flatten out nicely with opposite aileron and the addition of some throttle.

I have a planes that will flat spin like crazy doing exactly this. Some will enter in many other ways, but this way will work for most anything capable.

-Cheech

Thanks, Guys,

Now if it will just quit raining...

Minn, can do a great flat spin just don't ask him how hover

[:@]

Now that the easy question was answered, now lets tell him how to recover. Some planes will, and some won't without a lot of control.

Equalize the controls, then go opposite rudder and add power. Keep the attitude level with elevator and the ailerons centered. For the first couple of tries to get the combination right you may up up with a snap roll when recovering.

Again. some planes may stabilize by just centering and reversing the sticks , but some may take timing of a combination of throttle / aileron / rudder.

This maneuver takes a toll on the rudder control linkages, so make sure your hinges, horns, and servos are in good condition and can handle the torque.

And make sure you have PLENTY OF ALTITUDE!

I think you all have done a fine job of explaining it but here goes my 2 cents... The further back the CG the better... I like my CG as far back as I can get it and still be balanced on an empty tank... I actually judge my CG by going into a flat spin and see if I can still recover without throttle... That way I know I'll be OK if I dead stick... It is entered best as a stall as that is how you learn in full scale... Just go vertical or close to it, cut power, apply ful up or down(for inverted spin), and full rudder and elevator in the same direction... onece you are spinning down, slowly move your aileron stick to the opposite side... this will flatten it out... to recover release the sticks and apply full power... You shouldn't need power but it will speed up the recovery... I do spins all the time cause I get bored and I see how low I can recover... Eventually my boredom will end when I hit the deck and have some repairs to do

If you want to make it look really cool and be pretty easy try a blender to inverted flat spin. Go high and point the nose down full left aileron, after about two rotations jam the sticks towards the antena (like Minn said) and you have a blender. Then quickly slide the ailerons over to neutral or a little past and it'll quickly flaten out into a flatspin. Be aware that doing this might rip the wings off the plane but that'll look cool also and don't yell '"hey watch this" to your friends cause that's the kiss of death.

Hi guys
I practice the inverted flat spins on my profile Edge540T but the engine wants to quit when the Edge is spinning inverted? The power come back as soon as i recover the plane to normal fligh?

I can fly all day long inverted without any power issue but the engine wants to quit as soon as i do inverted flat spin.

Do you have any idea to solve this issue?
Os46FX with tower muffler

Scooby,

It sounds like the clunk in the tank is either hanging up and not picking up fuel or getting kinked. In any case, you will find the cuplrit in the tank somewhere.

My clunk should be fine because i don't have power problem when i fly inverted?? It happens only in flat spins inverted??

Anyway, i am going to open the tank to be sure....[>:]

I have that does the same thing. It's a SPAD so I can see the tank all the time. I have not been able to find the problem. I did find a cure. I just leave about 1/4 throttle in it at the top before I jam the sticks. The extra exhaust pressure seems to do the trick. I read a neat idea on another post yesterday. They suggested putting a one way valve in the pressure line to keep tank pressure up. I've got to try that. In theory it should cure this problem and maybe even help throttle response in a hover.

David

Harry Landings, good info on flat spins here....the only thing that I could add is that I find inverted flat spins to be easier than upright ones.......I don't know if it's just me or if they really are easier, but it might help to start by trying them inverted.

Inverted is easier because the rudder doesn't get washed out by the elevator.

I just took a close look at the photo. Try getting rid of the exhaust deflector. That's a lot of extra back pressure, and the deflector on the while engine inverted at idle may be letting a lot of oil remain in the exhaust pipe, possibly causing the glow plug to cool or foul.

This is happening because the clunk gets folded forward when inverted, and spinning. It drops down (maybe getting tangled in the vent line) then the rotation of the spin forces it forward, and now it's got the fuel line kinked.

Thanks for all the suggestions guys, I am going to try each one, step by step..
Yesterday, the engine was a bit better. I cut 2 inches of tubing between the tank and the muffler. The engine gave me a bit more spins before to quit.

David, i tough the one way valve works for liquid only? Are you saying the valve will keep the air pressure at the maximum in the tank? I like this idea but what valve part number are you talking about?

Good idea!
Daniel

Daniel, It's a suggestion I heard on another post. I have not been to the hobby shop yet to ask. You may be correct about it only working on liquid. Or maybe there is enough fuel residue in the exhaust line to make it work? I am going Sat I'll pick one up and try it.

David

It's called a "check valve" and they work on fuel or air. They are standard on YS engines to maintain tank pressure on the air side. I think Jettblue's explanation might make more sense and a stiffer and/or longer fuel line on the clunk may be the answer.

You can make a check valve if you've got a BB and the type of fuel filter that unscrews. It has a little, fine screen in it. You unscrew the filter, put the BB in one side, and then screw it together. The BB should be on the side of the screen closest to the muffler. Or....the sequence of parts: 1. muffler pressure line 2. filter half 3. BB 4. screen 5. filter half 6 muffler pressure line to tank.
Won't work/run with it backwards.

I tried the check valve thing on my OS 91FX. The pressure helps at at higher speeds. but when the engine is brought back to idle it would flood out. It seems as if a regulator of some sort would be needed.
I think I would also look at the clunk set-up first.

Greg

You will need to re-set your low speed adjustment.

My engines are always well set

I usually use 15% nitro Wildkat fuel on my os46fx with tower muffler. Someone at the field use only 30%nitro, 18%oil to practice 3D with 2 strokes engines. He tried many things with tuned pipes, 4 strokes engines and on the same planes. He got the best results with 2 strokes engines and more nitro than any other solutions. The engine will run colder and be more crisp. I bough on gallon and i am going to try it next weekend.

Daniel