Ever wonder about the cartridges Jimmy Stewart used to start the Phoenix?
I have since 1965. Its called a Coffman starter and uses brass shells like shotgun shells filled with cordite to provide the pressure to run the starter.
I think 4ga shells were fairly common back in the 1800s--they were used in Punt Guns for edible bird harvesting. I don't know if anyone makes them now, but I'm sure that 8ga shells exist because they are used in cement plants to break up "fire rings" in the big rotating kilns. (I worked around one in a 1950s summer job--huge bang and flash!)
flashguy
Texan by choice, not accident of birth
April 21, 2020, 01:15 AM
Modern Day Savage
Most of the aircraft we flew were started by hand propping, a couple with electric starters, and one aircraft was equipped with one of my favorite starting methods, the inertial starter...but I'll admit that I'd love to try a Coffman starter someday.
Following the same basic principle as the Coffman starter, there is also a compressed air starter.
I recall in the Air Force (Germany) we had F-4's staged in a "Hot Area" for rapid deployment. They were equipped with an electcally initiated starter cartridge for each engine. The starter charge (cordite?) blew air into the intake, rotating the engine allowing it to start.This message has been edited. Last edited by: Lunasee,
April 21, 2020, 05:42 AM
YooperSigs
IIRC, the starter cartridge for a B-52 is about the size of a gallon milk jug.
End of Earth: 2 Miles Upper Peninsula: 4 Miles
April 21, 2020, 06:06 AM
Fredward
Wow. Hate to sound like a kid, but this is awesome cool info. I saw the "Flight of the Phoenix" first run, and always wondered.
April 21, 2020, 07:03 AM
kz1000
Model T airplane starter.
------------------------------------------------------------------------ "Yidn, shreibt un fershreibt"
"The Nazis entered this war under the rather childish delusion that they were going to bomb everyone else, and nobody was going to bomb them. At Rotterdam, London, Warsaw and half a hundred other places, they put their rather naive theory into operation. They sowed the wind, and now they are going to reap the whirlwind." -Bomber Harris
April 21, 2020, 08:40 AM
104RFAST
When I was stationed at Eglin AFB half the base was SAC. I was at the end of the runway on drag chute detail when President Kennedy was shot. Suddenly,a very large cloud of black smoke appeared behind the tree line and all available B-52'S were scrambled using what we called "gun powder starting canisters". Imagine 12 B52's starting engines at the same time.I'll never forget seeing that many B52's taking off so close together the trailing aircraft having multiple compressor stalls.I thought we were at WAR
April 21, 2020, 10:50 AM
HRK
Is that a Bristol F2B Fighter from WW1 attached to the Model T?
April 21, 2020, 11:03 AM
Sig2340
quote:
Originally posted by HRK: Is that a Bristol F2B Fighter from WW1 attached to the Model T?
I believe it is a Bristol F2B.
Nice is overrated
"It's every freedom-loving individual's duty to lie to the government." Airsoftguy, June 29, 2018
April 22, 2020, 09:01 PM
Aquabird
Every time I say something like that during or after a movie, My wife says relax, its only a movie.
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April 23, 2020, 08:18 AM
pbslinger
quote:
Originally posted by Aquabird: Every time I say something like that during or after a movie, My wife says relax, its only a movie.
Is that when watching “Flight of the Phoenix “ or “Debbie Does Phoenix?”
April 23, 2020, 09:55 AM
sns3guppy
The downside to the Coffman and Breeze starter systems, on radial engines, is that often radials don't start on the first rotation. Especially in colder weather, it may be necessary to flood the supercharger with fuel which runs out the supercharger drain during the start process, and can result in an engine and ground fire. Radials may take numerous rotations before enough cylinders begin firing, to sustain rotation.
Radials tend to fill up in the lower cylinders with oil, which can cause hydraulic lock, and can bend connecting rods. The engine is pulled through by hand first, but it can fill up after, and it's safest to use a starter with a clutch that will release against resistance, as well as watch closely for propeller hesitation or stoppage during the start cycle.
On large radials, we always turned it through 9-12 blades before introducing fuel. It's not uncommon to need to turn a radial engine through a number of rotations while starting, before it finally fires, and gets enough cylinders coughing out there to keep it running.
Cartridge starters were far more reliable in turbojet aircraft, the main advantage being getting multiple engines started at the same time or in close order, rather than waiting for the start cycle on each (for air starter equipped aircraft).
I never liked inertial starters.
April 23, 2020, 10:12 AM
pbslinger
I assume they are more ideal for warplanes, eliminating heavy batteries and wiring for electrical starting, and allowing non supported remote starting.
April 23, 2020, 11:16 AM
tacfoley
Here's a short movie taken at Bruntingthorpe UK, of a research Canberra and is Coffmann cartridge start...
They allow a rapid start; provisions have been available in some civil aircraft. I used to fly a polish airplane with a radial engine that had provisions for a cartridge start, though we didn't use it. We had the miserable inertial starter, instead.
In turbine aircraft, either external electrical power, or external air, or both, are required during engine starts. To start using internal air, an aux power unit must be started, then each engine started in turn (some aircraft to or more at once), whereas a cartridge starter allows firing of multiple engines rapidly, and in some cases, with limited or no ground support.
April 23, 2020, 01:14 PM
c1steve
Some diesel engines use a powerful wound up spring starter, and some used a hydraulic system. The hydraulic system was pumped up by hand, and was typically used on lifeboats.