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View Full Version : Re: Open Cirrus Performance Specs


Frank Whiteley
May 24th 07, 06:15 AM
Cockpit load is 551lbs minus weight of non-lifting components. It can
be well over 250lbs.

Frank Whiteley

On May 23, 12:14 pm, Chris Reed > wrote:
> I have a German Cirrus (the "Open" is not part of the official name, but
> was added by most when the baby version came along) and a friend has a
> VTC model. Both have the full VNE, so it's worth considering one
> depending on what VNE is where you are situated. I've flown both, and
> there's no appreciable difference between them.
>
> The first place to start ishttp://classicsailplane.org/Cirrus/where
> you'll find a directory, pictures and newsletters - lots of information.
>
> The Cirrus is a 1967 aircraft, first generation glass. It's very strong
> (wings tested by the LBA to 15g I understand) and mine, which was
> re-gelled a few years back, looks pretty much as good as new. Handling
> is good, the cockpit is wide (though tight for tall pilots who are long
> in the body but great for long legs), and I work on 40:1 L/D which I
> find on the conservative side.
>
> This is not a glider for rushing around in - the aim is to travel long
> distances in a stately fashion. Cruise is 50-65 kt (but better at
> 50-55), landing around 50 kt, etc. etc. Follow the energy, turn as
> little as possible, and you can cruise long distances. Excellent for
> weak days - my first 300k flight was made with a 3,500ft cloudbase and
> thermal averages around 3 kt.
>
> Stall is around 36kt, VNE 118 kt (but you don't want to fly that fast),
> rough air the same, max winch launch 59kt, max aerotow 74kt. Cockpit min
> weight depends on history, but on the ones I've seen seem to average
> around 165lb. Max is the standard 242lb (from memory).
>
> Because of the age of the design, and the solid build, the wings are
> comparatively heavy. However, I rig mine solo with simple aids (trestles
> and a mid-wing dolly) and it took me 25 mins to rig today and 20 to pack
> away in its trailer.
>
> I'm delighted with mine, because it suits my style of flying. If you
> want to scream around at 100kt, it's probably not the glider for
> you.It's a real distance machine - as a working rule, if you can see it,
> you can glide to it.
>
> Paul Hanson wrote:
> > I have a long time love affair with the Open Cirrus.
> > I have almost bought one on three separate occasions,
> > and am starting to get the itch again (Sunship Game
> > fever).
> > Can anyone provide me with complete performance specs
> > and operational limitations for this aircraft (not
> > terribly interested in the VTC made version since it
> > had a lower VNE and load ratings due to manufacturing
> > anomalies, but I suppose it would be neat to know for
> > the sake of comparison). I would like to know a lot
> > more about this plane than I currently do, and although
> > I have done a fair amount of homework on this type
> > I'm hungry for more info, much more info.
>
> > Paul Hanson
>
> > "Do the usual, unusually well"--Len Niemi

Chris Reed[_1_]
May 24th 07, 10:14 AM
Frank,

I think max cockpit weight depends where you are. I believe in the UK
all cockpit max weights are limited by the theoretical stressing of the
seat/harness mounts, which means 242 lb.

If Paul is in the US then he should go with your figures, I would imagine.

I think we'd both agree it's a great aircraft.

Frank Whiteley wrote:
> Cockpit load is 551lbs minus weight of non-lifting components. It can
> be well over 250lbs.
>
> Frank Whiteley
>
> On May 23, 12:14 pm, Chris Reed > wrote:
>> I have a German Cirrus (the "Open" is not part of the official name, but
>> was added by most when the baby version came along) and a friend has a
>> VTC model. Both have the full VNE, so it's worth considering one
>> depending on what VNE is where you are situated. I've flown both, and
>> there's no appreciable difference between them.
>>
>> The first place to start ishttp://classicsailplane.org/Cirrus/where
>> you'll find a directory, pictures and newsletters - lots of information.
>>
>> The Cirrus is a 1967 aircraft, first generation glass. It's very strong
>> (wings tested by the LBA to 15g I understand) and mine, which was
>> re-gelled a few years back, looks pretty much as good as new. Handling
>> is good, the cockpit is wide (though tight for tall pilots who are long
>> in the body but great for long legs), and I work on 40:1 L/D which I
>> find on the conservative side.
>>
>> This is not a glider for rushing around in - the aim is to travel long
>> distances in a stately fashion. Cruise is 50-65 kt (but better at
>> 50-55), landing around 50 kt, etc. etc. Follow the energy, turn as
>> little as possible, and you can cruise long distances. Excellent for
>> weak days - my first 300k flight was made with a 3,500ft cloudbase and
>> thermal averages around 3 kt.
>>
>> Stall is around 36kt, VNE 118 kt (but you don't want to fly that fast),
>> rough air the same, max winch launch 59kt, max aerotow 74kt. Cockpit min
>> weight depends on history, but on the ones I've seen seem to average
>> around 165lb. Max is the standard 242lb (from memory).
>>
>> Because of the age of the design, and the solid build, the wings are
>> comparatively heavy. However, I rig mine solo with simple aids (trestles
>> and a mid-wing dolly) and it took me 25 mins to rig today and 20 to pack
>> away in its trailer.
>>
>> I'm delighted with mine, because it suits my style of flying. If you
>> want to scream around at 100kt, it's probably not the glider for
>> you.It's a real distance machine - as a working rule, if you can see it,
>> you can glide to it.
>>
>> Paul Hanson wrote:
>>> I have a long time love affair with the Open Cirrus.
>>> I have almost bought one on three separate occasions,
>>> and am starting to get the itch again (Sunship Game
>>> fever).
>>> Can anyone provide me with complete performance specs
>>> and operational limitations for this aircraft (not
>>> terribly interested in the VTC made version since it
>>> had a lower VNE and load ratings due to manufacturing
>>> anomalies, but I suppose it would be neat to know for
>>> the sake of comparison). I would like to know a lot
>>> more about this plane than I currently do, and although
>>> I have done a fair amount of homework on this type
>>> I'm hungry for more info, much more info.
>>> Paul Hanson
>>> "Do the usual, unusually well"--Len Niemi
>
>

Frank Whiteley
May 24th 07, 03:43 PM
You are right. Looks SH issued a TN in March 1984, limiting the max
cockpit load to 242.5lbs. Haven't been to the SH web site in some
years, but there's a complete list of TN's on models there now,
including the VTC. Anyone interested or owning these should give it a
visit.

Still, a great ship that will be flying well into the future.

Frank




On May 24, 3:14 am, Chris Reed > wrote:
> Frank,
>
> I think max cockpit weight depends where you are. I believe in the UK
> all cockpit max weights are limited by the theoretical stressing of the
> seat/harness mounts, which means 242 lb.
>
> If Paul is in the US then he should go with your figures, I would imagine.
>
> I think we'd both agree it's a great aircraft.
>
> Frank Whiteley wrote:
> > Cockpit load is 551lbs minus weight of non-lifting components. It can
> > be well over 250lbs.
>
> > Frank Whiteley
>
> > On May 23, 12:14 pm, Chris Reed > wrote:
> >> I have a German Cirrus (the "Open" is not part of the official name, but
> >> was added by most when the baby version came along) and a friend has a
> >> VTC model. Both have the full VNE, so it's worth considering one
> >> depending on what VNE is where you are situated. I've flown both, and
> >> there's no appreciable difference between them.
>
> >> The first place to start ishttp://classicsailplane.org/Cirrus/where
> >> you'll find a directory, pictures and newsletters - lots of information.
>
> >> The Cirrus is a 1967 aircraft, first generation glass. It's very strong
> >> (wings tested by the LBA to 15g I understand) and mine, which was
> >> re-gelled a few years back, looks pretty much as good as new. Handling
> >> is good, the cockpit is wide (though tight for tall pilots who are long
> >> in the body but great for long legs), and I work on 40:1 L/D which I
> >> find on the conservative side.
>
> >> This is not a glider for rushing around in - the aim is to travel long
> >> distances in a stately fashion. Cruise is 50-65 kt (but better at
> >> 50-55), landing around 50 kt, etc. etc. Follow the energy, turn as
> >> little as possible, and you can cruise long distances. Excellent for
> >> weak days - my first 300k flight was made with a 3,500ft cloudbase and
> >> thermal averages around 3 kt.
>
> >> Stall is around 36kt, VNE 118 kt (but you don't want to fly that fast),
> >> rough air the same, max winch launch 59kt, max aerotow 74kt. Cockpit min
> >> weight depends on history, but on the ones I've seen seem to average
> >> around 165lb. Max is the standard 242lb (from memory).
>
> >> Because of the age of the design, and the solid build, the wings are
> >> comparatively heavy. However, I rig mine solo with simple aids (trestles
> >> and a mid-wing dolly) and it took me 25 mins to rig today and 20 to pack
> >> away in its trailer.
>
> >> I'm delighted with mine, because it suits my style of flying. If you
> >> want to scream around at 100kt, it's probably not the glider for
> >> you.It's a real distance machine - as a working rule, if you can see it,
> >> you can glide to it.
>
> >> Paul Hanson wrote:
> >>> I have a long time love affair with the Open Cirrus.
> >>> I have almost bought one on three separate occasions,
> >>> and am starting to get the itch again (Sunship Game
> >>> fever).
> >>> Can anyone provide me with complete performance specs
> >>> and operational limitations for this aircraft (not
> >>> terribly interested in the VTC made version since it
> >>> had a lower VNE and load ratings due to manufacturing
> >>> anomalies, but I suppose it would be neat to know for
> >>> the sake of comparison). I would like to know a lot
> >>> more about this plane than I currently do, and although
> >>> I have done a fair amount of homework on this type
> >>> I'm hungry for more info, much more info.
> >>> Paul Hanson
> >>> "Do the usual, unusually well"--Len Niemi

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