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

I would say a further point on the SH Turbos is that they are only started by Windmilling and do not have a Starter Motor, therefore maybe less stress with slower Windmill starts on the Belts and prop shafts!!!!

A SH Turbo Driver

On Thursday, December 19, 2013 7:15:37 AM UTC-5, Muttley wrote:
I would say a further point on the SH Turbos is that they are
only started by Windmilling and do not have a Starter Motor,
therefore maybe less stress with slower Windmill starts on
the Belts and prop shafts!!!!

A SH Turbo Driver

Um, no, the start mechanism has no affect on fatigue problems.
However, do review the TNs and/or ADs on the support structure
in your installation...

On Thursday, December 19, 2013 4:31:09 AM UTC-8, Dave Nadler wrote:
On Thursday, December 19, 2013 7:15:37 AM UTC-5, Muttley wrote:

I would say a further point on the SH Turbos is that they are

only started by Windmilling and do not have a Starter Motor,

therefore maybe less stress with slower Windmill starts on

the Belts and prop shafts!!!!



A SH Turbo Driver



Um, no, the start mechanism has no affect on fatigue problems.

However, do review the TNs and/or ADs on the support structure

in your installation...

There's a very nice article describing the engineering mechanics of prop drives at this link. If the link doesn't work, just google "bd-5 prop shaft analysis" and choose the top link.

Craig

http://www.google.com/url?sa=t&rct=j... d.cGU&cad=rja



http://www.google.com/url?sa=t&rct=j...187178, d.cGU

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!

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"

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"

No, Like this http://www.flickr.com/photos/titanet/3923711894/
It's asymmetrical at rest but symmetrical when operating...
Dan


On Tuesday, December 24, 2013 11:22:47 AM UTC-5, Dan Marotta wrote:
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"

See this link
http://www.flickr.com/photos/titanet/3923711894/
So the prop extends to the open position as the RPM increases when starting.
Dan
On Tuesday, December 24, 2013 9:26:36 AM UTC-5, firsys wrote:
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"

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"