I know the DC-8 used a bleed-air blowaway jet to kill off a vortex which causes the engines to suck in excessive amounts of stuff on the ground. Does the 707 use a similar device, or did they figure out a way around it.
Andrea K
Moderators: richierich, ua900, PanAm_DC10, hOMSaR
RE: JT3C Engine-Pod / Blowaway Jet
Actually, all of the DC8s had the blowaway jet.
RE: JT3C Engine-Pod / Blowaway Jet
No, nothing special fitted to the B707 for the stated purpose.
All 707's did have thrust recovery valves, however.
Different function entirely.
All 707's did have thrust recovery valves, however.
Different function entirely.
RE: JT3C Engine-Pod / Blowaway Jet
To 113312
Actually, to my knowledge the DC-8-62 and DC-8-63 didn't appear to have them to my knowledge...
To 411A,
What's a thrust-recovery valve?
To both:
Why did the 707 (and CV-880 as well to my knowledge) not need a blowaway-jet, and the Douglas design did?
Andrea Kent
Actually, to my knowledge the DC-8-62 and DC-8-63 didn't appear to have them to my knowledge...
To 411A,
What's a thrust-recovery valve?
To both:
Why did the 707 (and CV-880 as well to my knowledge) not need a blowaway-jet, and the Douglas design did?
Andrea Kent
RE: JT3C Engine-Pod / Blowaway Jet
Thrust recovery valve.
A valve mounted more or less flush with the lower fuselage, the purpose of which is to expell cabin pressurized air at approximately a 45 degree angle (rearwards).
These valves assist with cabin ventilation, and are normally fully open in flight.
Long body B707 aircraft have three, short body aircraft have two.
A Boeing exclusive, so far as I know.
A valve mounted more or less flush with the lower fuselage, the purpose of which is to expell cabin pressurized air at approximately a 45 degree angle (rearwards).
These valves assist with cabin ventilation, and are normally fully open in flight.
Long body B707 aircraft have three, short body aircraft have two.
A Boeing exclusive, so far as I know.
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- grandtheftaero
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RE: JT3C Engine-Pod / Blowaway Jet
I wonder how much thrust they actually "recovered" with those.
RE: JT3C Engine-Pod / Blowaway Jet
I was told by a Boeing design engineer....the thrust recovered is about 2 MFP.
RE: JT3C Engine-Pod / Blowaway Jet
| Quoting Blackbird (Reply 3): Actually, to my knowledge the DC-8-62 and DC-8-63 didn't appear to have them to my knowledge... |
The -62 and -63 had the blowaway jet as well. However, the -70 series did not.
Chris
Don't blame me, I don't work here...
RE: JT3C Engine-Pod / Blowaway Jet
Where were the "blowaway" jets located... I don't seem to see them in the design?
Also.... why did the DC-8 need blowaway-jets and the B-707 didn't?
Andrea Kent
Also.... why did the DC-8 need blowaway-jets and the B-707 didn't?
Andrea Kent
RE: JT3C Engine-Pod / Blowaway Jet
I don't know about the 707, but the 737s got them with the gravel kits:
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Photo © Aaron Hall
Photo © Aaron Hall
RE: JT3C Engine-Pod / Blowaway Jet
VC-10,
What's an MFP though?
Andrea K
What's an MFP though?
Andrea K
RE: JT3C Engine-Pod / Blowaway Jet
| Quoting Blackbird (Reply 12): What's an MFP though? |
I've no idea!
More info on the VC10 'Thrust Augmenters' can be found here
http://www.vc10.net/Technical/oddities.html
RE: JT3C Engine-Pod / Blowaway Jet
| Quoting Blackbird (Reply 9): Where were the "blowaway" jets located... |
They were on the bottom of the nacelle near the front, and would not be obvious unless you were under the engine looking up.
Chris
Don't blame me, I don't work here...
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