Unlimited - Double Positive Snap?

[Jim Woodward]

Hi Guys,

I've been thinking about this double-positive snap in the unlimited sequence and how I think it relates to my spinner coming off the backplate and doing a lot of damage to my plane. Has anyone else noticed "funny-stuff" happening to their plane after flying this sequence a few times? Anyone with wings that mysteriously bend a little more than they should or motors breaking parts? Is anyone doing this at full throttle (... I think not, but you never know)? I'm more than 1/2 throttle when I do it as for now. Should we offer a prize for the first plane to go "catastrophic" from this?

Bottom line, has anyone else noticed accelerated plane wear of any type? Totally unscientific, but just wondering.
Thanks,
Jim

[Flyfalcons]

From doing two snaps in a row? Sounds like you need a better plane.

[Rolling Thunder]

I don't think that any element is out of the ordinary. I don't like this sequence compared to past years. But that has nothing to do with high G's on the plane.

[Plane Wrappers]

Hmmm....That makes 2 that I have heard of flying Unlimited and throwing spinners.
you and Bryan Luckett @ Bay City.
I'm glad you where able to shut yours down before the spinner shook the plane up.
Bryan wasn't so lucky.

[Jim Woodward]

HI Monty,

In my situation, as soon as I hit the double positive and stopped - almost instantly - you could hear something bad growling, so I shut down and dead stick landed. As an aside, the cowl is ready for paint (again )tomorrow night.
Jim

[RightThrust]

Jimbo. My 5 season old 260 has been through I have no freakin' clue how many, not only 2 positive snap elements, but gyroscopic maneuvers way more aggressive than such. With how fast the prop is turning I'd imagine the spinner doesn't care much of anything about the roll rate of the airplane during a snapping maneuver. I didn't take much attention to your spinner pre-destruction but was it composite or metal? I've split several backplates on Mejzlik spinners because the cone was just barely out of balance. After putting a small piece of velcro inside the cone and soaking it with CA until it balanced perfectly did I stop tearing up backplates. I guess what I'm trying to say is that I wouldn't worry about flying the airplane any easier thinking it'll save your spinner. Fly it like you stole it!!!

-Kelly

[Jim Woodward]

Thanks Kelly, It was a cheap MPI AL spinner. However, saving the spinner is not the issue. When the spinner gets caught inbetween the backplate and the cowl, it becomes a more serious issue.

How did you balance the cone of your spinner?
Thanks,
Jim

[Wild Thang]

Try a True Turn.

[Ryans Rebel]

Interesting thread. I think this particular double snap puts more stress on a plane than most think. From upright into a cuban, most will carry a good bit of speed entering the snap. Also from upright, you have gravity adding to the stress. I also think that diung this particular double snap hundreds of times in a season will take its toll on a few planes out there. I would not be suprised if someone has a failure of some sort during this season doing the double snap.

[Danny Baker]

No spinner problems ever, no plane problems from flying unlimited for the last 8 years. At the Don Lowe we had 14.5 rotations of snaps in one known sequence. Plane did not care. I've always flown Dave Brown spinners with full backplates. I wear out servo gears more than anything these days.

Hope this helps, Dan

[McFueler]

Just but a GOOD spinner and don't worry about that anymore !

[Jim Woodward]

	Quote: Originally Posted by McFueler
	Just but a GOOD spinner and don't worry about that anymore !

Mark ..... guess which airplane I last had, had a spankin' new TT spinner on it???

[McFueler]

The one you crashes at Jax. last year ? Well it did not crash because of the spinner, that is why you need another one.

[JohnVH]

ever double check your screws? maintenance people....

/funny thread.

[as722]

Do a single snap instead, most judged whon't catch it anyway.


Albert