60 turn spin, is it possible?

[nightbird]

Probably some of you have seen this video, is it really posible to do that many turns in a spin, what I'm concern here is how high you have to be and if it's possible to get there in a 152. Just out of curiosity i would like your inputs on this as i only have done a handful of those and only two or three turns each.

http://www.youtube.com/watch?v=iQkk0JLjEJY

[Dagwood]

Hahaha, all I can think of is and

I can't say I've ever done that, but I did hear through hangar talk of a pair needing to get a 172 down from 10,000. They decided to spin it all the way down. However, as any spin progresses, it gets flatter. Our duo needed to bring their seats full forward and lean forward to recover from the spin. No idea how many rotations they did.

Aren't cessnas only certified (or demonstrated) to do a 6 rotation spin?

[paydaymayday]

I once took a 150 to 12,500 and decided the fun way to get back down was to spin her. It tightens up real good after about 10 rotations, so I broke it up into several spins.

Took absolutely forever to get it up that high, too.

[nightbird]

So taking this to simple math if you loose maybe 200 ft per turn (correct me if it's more or less) 60 turns would be 12 000 ft plus if you wanna recover at 2000 ft agl you will need to go up to 14 000 agl, where I fly that's close to 16 000 msl !!! That's gonna take a LOT if you even make it up there (i don't remember what is the service ceiling for the 152)

[AuxBatOn]

From her altimeter, it looks like she was around the 14000' MSL mark. I don't see why it wouldn't be possible.

[Blue Side Down]

I once took a 150 to 12,500 and decided the fun way to get back down was to spin her. It tightens up real good after about 10 rotations, so I broke it up into several spins.

Took absolutely forever to get it up that high, too.

The spin mode is actually oscillatory in nature... if you kept at it would have flattened and slowed down before steepening and speeding up and then flattening again etc.

[old_man]

God only knows what your inner ear is doing after 60 spins.

If I sat in a swivel chair, spun 60 times, and then tried to walk I think I would be in trouble. I am sure my eyes would be able to see what is up and down but my body would be messed. I would think in a plane your eyes would be able to tell you what is up and down but you would probably have a horrible case of the 'leans' or the 'Coriolis effect'.

[nightbird]

The spin mode is actually oscillatory in nature... if you kept at it would have flattened and slowed down before steepening and speeding up and then flattening again etc.

Did you guys noticed how instead of crossing the control she has the aleron all the way to the direction of rotation? Maybe this has some effect on making the spin less flat?

[AntiNakedMan]

I remember right after I got my PPL one of the guys I was on the course with told us all about how he scared himself in a 152....

He took it up to 10,000 or so, and started to spin it down... he said around 3000' AGL the engine quit... by the time they were recovered, and got the engine started again, he was 200' agl, and for a guy with a fresh PPL it was enough to scare him.

[CelBatrin]

Does the HI get hot?

[paydaymayday]

So taking this to simple math if you loose maybe 200 ft per turn (correct me if it's more or less) 60 turns would be 12 000 ft plus if you wanna recover at 2000 ft agl you will need to go up to 14 000 agl, where I fly that's close to 16 000 msl !!! That's gonna take a LOT if you even make it up there (i don't remember what is the service ceiling for the 152)

Like I said before, I got an old, worn 150 with a sandblasted prop to 12.5 with a passenger on. It's doable, it just takes a while... if I recall correctly the climb rate was down to 200 feet a minute and I had a 5 knot window to maintain any semblance of a climb. It was great, I went full rich on the mixture to see if it would quit... and it did, instantly! Fun flying.

[Osiris]

Did you guys noticed how instead of crossing the control she has the aleron all the way to the direction of rotation? Maybe this has some effect on making the spin less flat?

In-spin (or pro-spin) aileron will take you out of the spin (and cause an increase in the rate of rotation on the way to recovery). In some aircraft it's instantaneous and in other's it may take a few rotations. Out-spin aileron will flatten the spin. Adding power with out-spin aileron will flatten it more.