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JBernier(at)dart.org
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 Posted: Wed Mar 21, 2007 7:38 am Post subject: Short Stacks |
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Gentlemen,
I had the pleasure of flying in Collings Foundation's B-25 Tondelayo yesterday. Upon start-up it was back firing through the exhaust. During flight it was not. When it was taxied back and idled it began to back fire again, only more often. Sounded like a stuck exhaust valve on one cylinder. This plane used the Wright R2600-92 engine. The pilot explained it as due to "short exhaust stacks". Can this be true and how? Or was he just trying to give me comfort? Is this another job for MMO?
Jim B
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cjpilot710(at)aol.com
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| Posted: Wed Mar 21, 2007 9:38 am Post subject: Short Stacks |
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In a message dated 3/21/2007 10:40:18 A.M. Eastern Standard Time, JBernier(at)dart.org writes:
Jim B,
Nothing wrong with the engines. The B-25 does have short exhaust stacks and she "barks" like a bitch. At idle speeds the barking sounds irregular, one because not all the cylinders have short stacks, and two: the firing order of the two engines are not synchronized with each other. The engine is very tightly cowl ed and some of her short stacks maybe only 8 or 9 inches long. She does sound like something is wrong - but it taint. Tondelayo has given us little problems since we put her on the line. Her engines have been the least. Of that vintage of warbird the B-25 is probably the easiest to fly, with only her engine out Vmc of 145 mph being a real concern.
I've seen the same thing done to a M-14p (some short stacks on some cylinders and an collection ring on the others. Sounded horrible, but the engine was really OK.
Jim "Pappy" Goolsby
| Quote: | Gentlemen,
I had the pleasure of flying in Collings Foundation's B-25 Tondelayo yesterday. Upon start-up it was back firing through the exhaust. During flight it was not. When it was taxied back and idled it began to back fire again, only more often. Sounded like a stuck exhaust valve on one cylinder. This plane used the Wright R2600-92 engine. The pilot explained it as due to "short exhaust stacks". Can this be true and how? Or was he just trying to give me comfort? Is this another job for MMO?
Jim B
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