Buying prop strike engine

Flange runout means absolutely nothing. Especially on Lycomings.
Because of the meatllurgy involved they don't bend, they break.

wrote:
http://www.whiteindustries.com/

White Industries lists engines with flange runout. What does flange
runout tell about the engine?

It seems some prop strike engines have a larger flange runout reading
than others, and the larger the flange runout, the lower the price.
Why?

Thanks.

White Industries lists engines with flange runout. What does flange
runout tell about the engine?

It seems some prop strike engines have a larger flange runout reading
than others, and the larger the flange runout, the lower the price.
Why?


The higher the runout number, the more damage there is to either the
crank or the case. It depends on the exact engine series as to how bad
a number you can tolorate before the repair costs are closing in on
replacement costs.

For me, it's not worth dealing with an engine that has had a prop
strike unless one of two things are known:

1: The prop strike was with a wooden prop or

2: The case has already been through a complete inspection and the shop
is able to guarantee that the case has no damage, visable or hidden,
and that the case will meet or beat the table of limitations the
manufacturer has for that engine.

Craig C.

1: The prop strike was with a wooden prop or...

Some composite props, like IVO, break easy on impact. I had a prop
strike with IVO and had the crank magnafluxed. No flange runout or
cracks were found. I have a Franklin 6A350 engine (are they more
solid?).. It's the aluminum rigid props that are crank killers.
----------------------------------------------------------------
SQ2000 canard http://www.abri.com/sq2000

abripl wrote:
1: The prop strike was with a wooden prop or...

Some composite props, like IVO, break easy on impact. I had a prop
strike with IVO and had the crank magnafluxed. No flange runout or
cracks were found. I have a Franklin 6A350 engine (are they more
solid?).. It's the aluminum rigid props that are crank killers.

You're taking your chances either way. A few years ago I met a guy
at a Montana backcountry strip that was taking his wings off and
putting his Champ on a flatbed truck. Seems his crank snapped in
flight and he was lucky enough to be within gliding distance of a
usable strip. He had taxied his plane into a snowbank a few months
earlier. It stopped the engine, but hadn't damaged the prop, so he
assumed everything was OK. That assumption nearly killed him and his
passenger a few months later.

Prop damage or flange runout doesn't tell you anything about possible
cracks in the crank.

John Galban=====N4BQ (PA28-180)

If he hadn't run into the snow bank is there a guarantee that the crank
was OK? Aren't there faulty cranks for other reasons and it could have
been a coincidence? Also did he have an aluminum prop?

...............................Seems his crank snapped in
flight and he was lucky enough to be within gliding distance of a
usable strip. He had taxied his plane into a snowbank a few months
earlier. It stopped the engine, but hadn't damaged the prop, so he
assumed everything was OK. That assumption nearly killed him and his
passenger a few months later.
...

abripl wrote:
If he hadn't run into the snow bank is there a guarantee that the crank
was OK? Aren't there faulty cranks for other reasons and it could have
been a coincidence? Also did he have an aluminum prop?


Wood prop. There is no guarantee that he didn't have a faulty crank.
Then again, the engine had run fine for decades and the crankshaft
snapped less than 25 hrs.after the snow bank stoppage. Feel free to
assume that it was a coincidence.

John Galban=====N4BQ (PA28-180)

On 10 Aug 2006 06:46:08 -0700, "abripl"
wrote:


If he hadn't run into the snow bank is there a guarantee that the crank
was OK? Aren't there faulty cranks for other reasons and it could have
been a coincidence? Also did he have an aluminum prop?

As to the thread subject a prop strike now days is anything that
requires more than a *minor* prop dressing. So technically a prop
strike engine stretches the gauntlet from "so what" to the "don't go
near it".

We think of snow and snow banks as being soft. I live in Michigan and
we have some snowbanks that'd support a truck and are as hard as
rocks. Nor does the snow have to be packed to get that way.

After a fresh snow I've driven *through* snow banks that were higher
than the hood of my car without hardly slowing down. I've also hit
some relatively small ones (before air bags) that resulted in me
getting out to make sure the front end of the car was OK. Being much
older and hopefully smarter, I now consider what might be hiding in
those drifts.

...............................Seems his crank snapped in
flight and he was lucky enough to be within gliding distance of a
usable strip. He had taxied his plane into a snowbank a few months
earlier. It stopped the engine, but hadn't damaged the prop, so he

A sudden stoppage can be every bit as damaging as one that kills the
prop. Sometimes even worse.

assumed everything was OK. That assumption nearly killed him and his
passenger a few months later.

I've had a sudden and complete engine failure in the Deb. I was able
to put it down on the airport. I never considered that being nearly
killed even though had it quit 10 seconds later I'd have ended up in
the woods.

I might consider an engine failure followed by an uneventful forced
landing as an expensive inconvenience and ahead of time I'd have
considered it *possibly* life threatening, but if all goes well I'd
not say they were nearly killed. Certainly he put them in what might
have been a life threatening situation un-necessarily.

Most off field landings are uneventful. Exciting, but uneventful.

OTOH you never know until the dust settles.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
...
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

If your going to rebuild anyway, take a look at these.
http://www.airboattrader.com/PartsForSale.htm
Lou

Great site, I especially like the 8 cylinder Contential:

http://www.airboattrader.com/PartsF1420.jpg



"Lou" wrote in message
ups.com...
If your going to rebuild anyway, take a look at these.
http://www.airboattrader.com/PartsForSale.htm
Lou