Blackbird
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SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 3:01 am

I have a number of questions, and I'd appreciate it if somebody even had an answer to one of 'em, although if somebody know's 'em all that would REALLY help!

The first question regards the plane's hydraulic control's
From what I remember, the SE-210 Caravelle featured fully-powered hydraulic surfaces, did these hydraulic systems have artificial feel, and were all the control-surfaces capable of manual-reversion should hydraulics fail?

Second question regards the airplane's average takeoff distance? I remember hearing a case where a fully loaded Caravelle (III, I think) took 8,000 feet to get into the air when fully loaded after a 42-second takeoff run, but what would most of the Cavelle's fair in terms of takeoff distance under light or average loads?

Third, the flaps appeared to be fowler-type. Were they single slotted, or double-slotted? And does anyone know what settings they used? Even if nobody knows all the settings, does anybody know what settings were used for takeoff and landing? Also, did any variants have any leading-edge devices?

Fourth, to the best of my knowledge, some Caravelle's did not have speedbrakes/spoilers or the like. Which variants did, and which did not? And regarding the ones that didn't, how the hell did they slow-down in a reasonable distance (particularly in the air)?

Fifth, does anybody know what the plane's .mmo and .vmo are?

Sixth, from what I remember reading, the plane's thrust to weight ratio, fully-loaded, was quite low compared to other jetliners, say the 707-120, fully-loaded? How was the airplane considered to be considered to be such a good performer if it was so underpowered?

Seventh, how many variants and sub-variants of the SE-210 Caravelle were built?


Andrea Kent
 
timz
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RE: SE-210 Caravelle Questions

Sat Jul 14, 2007 3:39 am

Quoting Blackbird (Thread starter):
the plane's thrust to weight ratio, fully-loaded, was quite low compared to other jetliners, say the 707-120, fully-loaded?

Compared to a JT3C-powered 707? That can't be right.
 
Blackbird
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 4:07 am

Take the weight of a fullly loaded caravelle, divide by the amount of thrust the two avons produce. You end up with one pound of thrust for five pounds of plane.

With water injection a 707-120 had 1 pound of thrust per 4.57 lbs of plane. With no water injection it's about one pound of thrust per five pounds of plane.


Andrea Kent
 
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 5:04 am

Quoting Blackbird (Thread starter):
Fourth, to the best of my knowledge, some Caravelle's did not have speedbrakes/spoilers or the like. Which variants did, and which did not? And regarding the ones that didn't, how the hell did they slow-down in a reasonable distance

At least some Caravelles were equipped with drag chutes. According to what I've read, they were mostly just used on wet or icy runways.


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Blackbird
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 5:32 am

USCG130,

I was more or less referring to the airplane's ability to slow itself down while in the air, not on the ground.

Andrea Kent
 
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 9:08 am

Quoting Blackbird (Thread starter):
From what I remember, the SE-210 Caravelle featured fully-powered hydraulic surfaces, did these hydraulic systems have artificial feel, and were all the control-surfaces capable of manual-reversion should hydraulics fail?

Any non fly-by-wire aircraft with fully powered controls requires an artificial feel system. As for manual reversion I don't know but I would hazard a guess and say yes. Only large aircraft with powered controls have no possibility of manual reversion. Other similar sized aircraft have it for sure.

Are you sure the Caravelle's flight controls were fully powered? Hydraulically boosted controls were common in 50s and 60s.

Quoting Blackbird (Thread starter):
And regarding the ones that didn't, how the hell did they slow-down in a reasonable distance

I thought all Caravelles had airbrakes (mounted above and below the wing). However if some versions did not have them, they could always extend the gear to slow down.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
 
Blackbird
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 10:08 am

Jetlagged,

To be honest, I'm not sure if they're boosted, or fully powered, or what have you. I also am not sure if they have an artificial feel system.

Well, I remember hearing that some Caravelle's had speed-brakes, which would imply that others did not. Regarding landing gear-use to slow the plane down, keep in mind that the Caravelle can achieve at least 335 kts indicated, and most gears have a max deployment speed of 270 kts, unless the Caravelle has a stronger gear to go from 335 to 270, I'm kind of wondering how they slowed down in time?

Andrea Kent
 
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 10:21 am

Quoting Blackbird (Reply 6):
To be honest, I'm not sure if they're boosted, or fully powered, or what have you. I also am not sure if they have an artificial feel system.

Well, as I said: a boosted system would not need artificial feel, but a fully powered system must have it.

Quoting Blackbird (Reply 6):
I remember hearing that some Caravelle's had speed-brakes, which would imply that others did not.

I don't see that one follows from the other, but I then didn't hear what you heard.  Wink

Quoting Blackbird (Reply 6):
keep in mind that the Caravelle can achieve at least 335 kts indicated, and most gears have a max deployment speed of 270 kts

Most aircraft are quite capable of slowing down to 250 knots by 10000 feet (even while descending) without speedbrakes (well maybe not the 777). Clean drag is sufficient.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
 
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RE: SE-210 Caravelle Questions / Variants

Sat Jul 14, 2007 11:09 am

The following applies to various models of the SUD Caravelle...

SE210 model I

RollsRoyce Avon 522 engines
Vne 325 knots or M.81, whichever is higher
Vno 300 knots or M.77, whichever is higher

Air brake operation, 305 Knots or M.81
No Vmc listed, as at all weights/CofG locations, always LESS than the stall speed.

SE210 model III

RR Avon 527 engines
Vne, 325 or M.81
Vno, 300 or M.77

Air brake operation, 325 knots or M.81
Brake parachute operation, normal operation, 115 knots, maximum, 130 knots.

No Vmc (as above list reason).

SE210 model VIR

RR Avon 532R or 533R engines.
Vne, 350 or M.81
Vno, 300 or M.77

Air brake operation, 350 knots or M.81

No Vmc.

SUD/Lear autoland fitted to some models, and all of those delivered to the French Post Office.

All models had hydraulic assist to elevators, ailerons, rudder.
In addition, all models had artificial feel systems for elevator, ailerons, rudder.

And now, engine starting...
112V DC was used in the SE Caravelle (Comet as well).
The RR Avon engines fitted on the Caravelle had 112V DC electric starters. All types mentioned had a large bank of multiple lead-acid 28V DC batteries in the belly, and the F/E had a selector for "Start 112V DC" or "Normal 28V DC"...
The batteries were switched by this selector to be connected in "series" to obtain 112V DC, for start purpose, then after engine start, the selector was moved back to normal (or parallel) to supply the aircraft 28V DC for most of the electrical requirements, and into inverters to produce 112V AC for various avionics.

Caravelle, a very well built airplane, and certainly a commercial success
 
Blackbird
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RE: SE-210 Caravelle Questions / Variants

Sun Jul 15, 2007 2:33 am

Thank you, 411A


Also, is there a Caravelle II, IV, V, etc... since you didn't mention them...

I actually knew the SE-210 had electrical-starters for the engine, I didn't know the Comet had a self-starting system.

I know this question might sound redundant, but I'll ask anyway... do all the control surfaces have manual reversion?

Do you know what the MTOW's and if possible, Max Landing Weights for the Caravelle's I, III, VI-R, and out of curiousity, while your at it -- I'm not sure if you'll know, but... do you know how much thrust the RR Avon Mk 522, 527, 532R, and 533R engines produced?


Andrea K
 
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RE: SE-210 Caravelle Questions / Variants

Sun Jul 15, 2007 4:30 am

Quoting Blackbird (Reply 9):
I know this question might sound redundant, but I'll ask anyway... do all the control surfaces have manual reversion?

Boosted controls have manual reversion by definition, but the forces will be high. Usually there is a tab which unlocks when hydraulic power is lost to provide aerodynamic assistance to the now unboosted control.
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Blackbird
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RE: SE-210 Caravelle Questions / Variants

Sun Jul 15, 2007 5:04 am

I was just curious since the SE-210's rudder doesn't appear to have any control or trim-tab.

Is it also true that the SE-210 has a small seperate lower rudder used for yaw-trimming alone (Hey, it may be a ridiculous question, but I heard it once in a book)

Andrea K
 
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RE: SE-210 Caravelle Questions / Variants

Sun Jul 15, 2007 8:18 am

One 1962 book says the original Caravelle I had 10760-lb Avon 522s and MTOW of 43.5 tonnes.

The IA had Avon 526s, thrust and weight not shown.

The III had Avon 527s, thrust 11400 or 11700, MTOW 46T.

The VI had Avon 531s, thrust 12500, MTOW 48T.

The VIR had 12600 or 12920 lb thrust and MTOW 50T.

Another 1962 book says the I had 11400 lb Avons and 43.5T MTOW-- they might be referring to the 1A, which they don't mention by name.

That book says 11700 lb and 46T for the III and 12200 lb and 47T for the VI. It also says the 10A had 16100 lb GEs and 52T MTOW.

Jane's 1959-60 says Caravelle was initially to be 43.5T with 10500-lb Avons, to be followed by the III with 45T/11400 and the VI with 47T/12200.

The Caravelle I was to be powered by the RA29 Stage 1, the III by the RA29 Stage 3, and the VI by the RA29 Stage 6. Apparently RR picked those numbers and didn't pick 2 or 4 or 5-- so no Caravelles with those marks.

Note that none of the combinations gives thrust-to-weight less than a 707-120.
 
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RE: SE-210 Caravelle Questions / Variants

Sun Jul 15, 2007 1:52 pm

When you say ton... do you mean regular ton or metric ton?

Andrea K
 
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RE: SE-210 Caravelle Questions / Variants

Mon Jul 16, 2007 6:32 am

Tonnes are metric tons. Or does no one use that spelling any more?
 
Blackbird
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RE: SE-210 Caravelle Questions / Variants

Mon Jul 16, 2007 10:40 am

Regarding the speed-brake thing... the Caravelle had brakes above and below the wing? How did that work with the flaps down?

Regaridng weight/mass issues, -- A metric ton is 1,000 kg right?

Andrea
 
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RE: SE-210 Caravelle Questions / Variants

Tue Jul 17, 2007 4:53 am

I'm doing some research into the Caravelles production numbers. As far as I can determined, there were 280 airframes assembled. Hopefully, I'll have a breakdown on the various variants in a day or two...unless someone else beats me to it.
Regards.
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RE: SE-210 Caravelle Questions / Variants

Tue Jul 17, 2007 9:25 am

Quoting Blackbird (Reply 15):
Regarding the speed-brake thing... the Caravelle had brakes above and below the wing? How did that work with the flaps down?

Exactly the same as with flaps up. More drag.

Quoting Blackbird (Reply 15):
Regaridng weight/mass issues, -- A metric ton is 1,000 kg right?

Metric ton is usually spelt tonne. Yes 1,000 kg or 2,204.6 lb (an imperial ton is 2,240 lb, so it's quite close in weight).
The glass isn't half empty, or half full, it's twice as big as it needs to be.
 
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RE: SE-210 Caravelle Questions / Variants

Wed Jul 18, 2007 10:49 am

Well, I did some research into the variants of the Caravelle, and here's what I came up with a breakdown on the production numbers.

Caravelle prototypes...2
Caravelle 1......22
Caravelle 1A....10
Caravelle 3......79
Caravelle 6N....52
Caravelle 6R....56
Caravelle 7........1
Caravelle 10R..20
Caravelle 11R....6
Caravelle 12.....12
Caravelle Super 10B...22

Total built of all airframes is 282. All noted above are as originally assembled. There were several upgrades & conversions in the years the aircraft were in service. An example...some -1s into -1As, and all -1As into -3s. The prototypes remain the property of Sud Aviation. The last Caravelle built in 1973, a -12, was scrapped after only 18 yrs of service, in 1991.
Hope you all find this info useful. Regards.
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RE: SE-210 Caravelle Questions / Variants

Wed Jul 18, 2007 11:44 am

The Caravelle III with the 11,700 lbf engines has a T:W of about 1 : 4.33... not as bad as the 707-120 with water injection.

Andrea K
 
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RE: SE-210 Caravelle Questions / Variants

Thu Jul 19, 2007 11:38 am

Are the trailing edge flaps single or double-slotted? Also, anybody know what the settings were?

Andrea K

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