F-80, T-33 QUESTION
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F-80, T-33 QUESTION
Saw my first F-80 overhead around 1947-48 and have always wondered, but forgot to ask, what causes the "moaning noise" they make during a slow pass in preparation for landing. It's similar to blowing into a Coke bottle sound. Would it have something to do with the two spring loaded doors just behind the cockpit?
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Re: F-80, T-33 QUESTION
Seems I have heard this discussion. As I recall, the F-80 was a single engine aircraft but had two fairly large intake nacelles on each side of the fuselage. When the engine was up to speed, air was drawn in through the nacelles but when the engine idled back, for landing, as in your question, there was more air than the engine would accept, so the excess air was blown out around the intake nacelles and produced the " moaning sound". Like blowing over a pop bottle.
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Re: F-80, T-33 QUESTION
There are air ducts at the opening of the intakes that have something to do ewith boundry air,and there are those two spring loaded doors about 3' X 1'behind the canopy. I'll try a web search.
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Re: F-80, T-33 QUESTION
So what you are saying is, when the engine idled down, the spring loaded doors opened on their own to dump the excess air being rammed into the intake nacelles ??
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Re: F-80, T-33 QUESTION
No idea really, but I always seemed to witness the event upon slow approach to the airfield by this type aircraft, not sure if they were throttling up or down.
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Re: F-80, T-33 QUESTION
The F-80 and the T-33 had the centrifugal flow eng. in them, the rest had the axial flow, the spring loaded doors behind the cockpit [called plenum chamber doors] were to allow more air to the eng. while on the ground, eng. run up and take off roll, once the acft. was in the air it got enough air thru. the two intake ducts and the spring loaded doors were no longer needed and closed.
The centrifugal and axial flow eng's were two comp. diff. eng,s, that might might be why they sounded diff. to you, they were also a less powerful eng. then the J-47 or the J-57 which were in the F-86 and the F-100.
The centrifugal and axial flow eng's were two comp. diff. eng,s, that might might be why they sounded diff. to you, they were also a less powerful eng. then the J-47 or the J-57 which were in the F-86 and the F-100.
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Re: F-80, T-33 QUESTION
Good intel, GI.
I searched for quite a while before finding a picture of the doors open. On top, right behind the canopy. Two doors, side by side, that hinged on the front and opened up and to the rear. In the picture, they looked to be hydraulically activated.
My first thought was speed brakes, but their size did not make sense. Too large to be sticking out in a 600 MPH slip stream. Second thought, that was a strange place for speed brakes.
I searched for quite a while before finding a picture of the doors open. On top, right behind the canopy. Two doors, side by side, that hinged on the front and opened up and to the rear. In the picture, they looked to be hydraulically activated.
My first thought was speed brakes, but their size did not make sense. Too large to be sticking out in a 600 MPH slip stream. Second thought, that was a strange place for speed brakes.
Mike Wolford
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Re: F-80, T-33 QUESTION
Spring loaded, you can push them inward by hand.
I can remember a T-33 Crew Chief explaining that the air pressure around the engine on the T-33 was something like 4 atmospheres, and I may stand corrected on this.
I had a brainstorm and did a search on F-80 Jet Engine Chamber Doors and that they allow extra air for the jet engine at speeds below 200 knots. Maybe that is the source of the noise in question as I only witnessed it on F-80's and T-33's in the immediate vicinity of the air field.
I can remember a T-33 Crew Chief explaining that the air pressure around the engine on the T-33 was something like 4 atmospheres, and I may stand corrected on this.
I had a brainstorm and did a search on F-80 Jet Engine Chamber Doors and that they allow extra air for the jet engine at speeds below 200 knots. Maybe that is the source of the noise in question as I only witnessed it on F-80's and T-33's in the immediate vicinity of the air field.
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Re: F-80, T-33 QUESTION
The T-33 and the F-80 both had the Allison J-33 engine, take off speed was around 105 to 115 knots, landing speed around 90-95 knots. they both did have speed brake's [speed boards] on the bottom of the acft. they also could carry a small baggage pod on their belly.
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Re: F-80, T-33 QUESTION
Look Familiar? Speed Boards are up in the photo.
F-80, F-84, F-86 sights like this were familiar constantly thru the mid 50's at Dow Field
F-80, F-84, F-86 sights like this were familiar constantly thru the mid 50's at Dow Field
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2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
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Re: F-80, T-33 QUESTION
Looking for one more 1/5 scale F-80 or T-33.
2011 MVPA PIONEER AWARD - MVPA #1064
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LIFE MEMBER AM LEGION-40/8-DAV
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