Don't you just hate it when the propeller departs the aircraft?

On Thursday, December 19, 2013 2:29:53 PM UTC-5, Craig Funston wrote:
There's a very nice article describing the engineering
mechanics of prop drives at this link.

Excellent read, Thanks Craig!

Not at North Las Vegas (VGT). Perhaps you refer to the Russia that went down about 70 miles north of Tonopah at Kingston NV.
IIRC he tried to bail but had problems.

BT

On Wed, 18 Dec 2013 22:33:51 -0500, "Morgans"
wrote:


"Dave Nadler" wrote in message
...
A prospect was checking out the nifty Antares 18T
sustainer system somewhere over the forest west of ZWB,
when to his great surprise, the propeller departed.
Hell of a way to impress a prospect.

The problem is with the Solo propeller shaft with the
belt reduction system as used on, IIRC:
- Ventus CM (not V2)
- Duo T
- DG-100T
I'll bet any money the problem will turn out to be torsional harmonics.

Remember the problem with the BD-5?

Yeah, I remember the problem with the BD-5. I know a few people who'd
like to get their hands on him.

On Thursday, December 19, 2013 4:47:20 PM UTC-7, Bill T wrote:
Not at North Las Vegas (VGT). Perhaps you refer to the Russia that went down about 70 miles north of Tonopah at Kingston NV.

IIRC he tried to bail but had problems.



BT

That's the one. You're right, Kingston, NV.

FW

Dave
The LBA restricts the AD to DG1000. The EASA mentions "with unfolding propeller". All gliders in your list have unfolding propellors except the Ventus CM which means the AD doesn't apply to it (yet ?).
Dan G


On Wednesday, December 18, 2013 11:54:38 AM UTC-5, Dave Nadler wrote:
A prospect was checking out the nifty Antares 18T

sustainer system somewhere over the forest west of ZWB,

when to his great surprise, the propeller departed.

Hell of a way to impress a prospect.



The problem is with the Solo propeller shaft with the

belt reduction system as used on, IIRC:

- Ventus CM (not V2)

- Duo T

- DG-100T

- Antares 18T

Apparently there have also been recent incidents with DG1000T.

The propeller is not identical on all the above so the

failure rates will differ.



Axel Lange has worked with Solo to redesign the offending

part and is working on EASA approvals. IIRC this will be

the 3rd or 4th AD on this part, but Axel can calculate why

it failed and also how to make a part that won't...



I don't know if there's been any communication from SH

or who else uses this particular (front belt-reduction)

Solo system.



I see DG has published some info he

http://www.dg-flugzeugbau.de/index.p...1349&tx_ttnews[tt_news]=147&cHash=cd1730aca0037e72c7b2911e83136b2e



Another reminder to always operate your motor with a

plan for failure at any point...



Aaarrrggggg....

Be safe out there,

See ya, Dave "YO electric"

On Sunday, December 22, 2013 4:19:37 PM UTC-5, wrote:
The LBA restricts the AD to DG1000. The EASA mentions "with
unfolding propeller". All gliders in your list have unfolding
propellors except the Ventus CM which means the AD doesn't
apply to it (yet ?).

I have no idea what EASA means by "with unfolding propeller".
On the list above, only the DuoT has a hinged (flapping)
propeller, which would I think reduce fatigue loads. All the
others have conventional one-piece propellers (except maybe a
handful of early Ventus CM which had some kind of asymmetrical
prop; I can't remember if those were hinged)...

I'll try contact SH after the holiday break.

Have a great holiday,
See ya, Dave "YO electric"

Check this out http://ad.easa.europa.eu/ad/2013-0217-E.
Yes The Ventus CM has an asymmetrical prop that probably reduces the torsional vibrations.
Dan G (Ventus CM Owner)

On Wednesday, December 18, 2013 11:54:38 AM UTC-5, Dave Nadler wrote:
A prospect was checking out the nifty Antares 18T

sustainer system somewhere over the forest west of ZWB,

when to his great surprise, the propeller departed.

Hell of a way to impress a prospect.



The problem is with the Solo propeller shaft with the

belt reduction system as used on, IIRC:

- Ventus CM (not V2)

- Duo T

- DG-100T

- Antares 18T

Apparently there have also been recent incidents with DG1000T.

The propeller is not identical on all the above so the

failure rates will differ.



Axel Lange has worked with Solo to redesign the offending

part and is working on EASA approvals. IIRC this will be

the 3rd or 4th AD on this part, but Axel can calculate why

it failed and also how to make a part that won't...



I don't know if there's been any communication from SH

or who else uses this particular (front belt-reduction)

Solo system.



I see DG has published some info he

http://www.dg-flugzeugbau.de/index.p...1349&tx_ttnews[tt_news]=147&cHash=cd1730aca0037e72c7b2911e83136b2e



Another reminder to always operate your motor with a

plan for failure at any point...



Aaarrrggggg....

Be safe out there,

See ya, Dave "YO electric"

On Sunday, December 22, 2013 5:54:28 PM UTC-5, wrote:
Yes The Ventus CM has an asymmetrical prop that probably
reduces the torsional vibrations.

Dan G (Ventus CM Owner)

IIRC, only a few early Ventus CMs - later ones have "normal" props.

See ya, Dave "YO electric"

What kind of asymmetry?

At least you can retract the engine; not so if the belt breaks.
!
John F




At 22:54 22 December 2013, wrote:
Check this out http://ad.easa.europa.eu/ad/2013-0217-E.
Yes The Ventus CM has an asymmetrical prop that probably reduces the
torsional vibrations.
Dan G (Ventus CM Owner)

On Wednesday, December 18, 2013 11:54:38 AM UTC-5, Dave Nadler wrote:
A prospect was checking out the nifty Antares 18T

sustainer system somewhere over the forest west of ZWB,

when to his great surprise, the propeller departed.

Hell of a way to impress a prospect.



The problem is with the Solo propeller shaft with the

belt reduction system as used on, IIRC:

- Ventus CM (not V2)

- Duo T

- DG-100T

- Antares 18T

Apparently there have also been recent incidents with DG1000T.

The propeller is not identical on all the above so the

failure rates will differ.



Axel Lange has worked with Solo to redesign the offending

part and is working on EASA approvals. IIRC this will be

the 3rd or 4th AD on this part, but Axel can calculate why

it failed and also how to make a part that won't...



I don't know if there's been any communication from SH

or who else uses this particular (front belt-reduction)

Solo system.



I see DG has published some info he


http://www.dg-flugzeugbau.de/index.p...1349&tx_ttnews[tt_news]=147&cHash=cd1730aca0037e72c7b2911e83136b2e



Another reminder to always operate your motor with a

plan for failure at any point...



Aaarrrggggg....

Be safe out there,

See ya, Dave "YO electric"

Is this what you mean?
http://www.glidingmagazine.com/Image...lerPylon01.jpg


"John Firth" wrote in message
...
What kind of asymmetry?

At least you can retract the engine; not so if the belt breaks.
!
John F




At 22:54 22 December 2013, wrote:
Check this out http://ad.easa.europa.eu/ad/2013-0217-E.
Yes The Ventus CM has an asymmetrical prop that probably reduces the
torsional vibrations.
Dan G (Ventus CM Owner)

On Wednesday, December 18, 2013 11:54:38 AM UTC-5, Dave Nadler wrote:
A prospect was checking out the nifty Antares 18T

sustainer system somewhere over the forest west of ZWB,

when to his great surprise, the propeller departed.

Hell of a way to impress a prospect.



The problem is with the Solo propeller shaft with the

belt reduction system as used on, IIRC:

- Ventus CM (not V2)

- Duo T

- DG-100T

- Antares 18T

Apparently there have also been recent incidents with DG1000T.

The propeller is not identical on all the above so the

failure rates will differ.



Axel Lange has worked with Solo to redesign the offending

part and is working on EASA approvals. IIRC this will be

the 3rd or 4th AD on this part, but Axel can calculate why

it failed and also how to make a part that won't...



I don't know if there's been any communication from SH

or who else uses this particular (front belt-reduction)

Solo system.



I see DG has published some info he


http://www.dg-flugzeugbau.de/index.p...1349&tx_ttnews[tt_news]=147&cHash=cd1730aca0037e72c7b2911e83136b2e



Another reminder to always operate your motor with a

plan for failure at any point...



Aaarrrggggg....

Be safe out there,

See ya, Dave "YO electric"