---------------------------------------------------------- Tailwind-List Digest Archive --- Total Messages Posted Fri 02/14/03: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:09 PM - Re: Exhaust Tailpipe Question (William Bernard) 2. 01:30 PM - Re: Exhaust Tailpipe Question (George Turner) 3. 01:30 PM - Re: Exhaust Tailpipe Question (George Turner) ________________________________ Message 1 _____________________________________ Time: 01:09:13 PM PST US From: "William Bernard" Subject: Re: Tailwind-List: Exhaust Tailpipe Question --> Tailwind-List message posted by: "William Bernard" Jim, A Mustang II builder named Kent Paser has done a lot of experimentation on going fast and has also written a book about it, "Speed With Ecomony" In his chapter on exhaust systems, he says the the exhaust pipes pointing parallel to the bottom of the fuselage give some 'jet thrust'. He also relates a story in which, during an experiment, the exhaust tips turned upward and melted the aluminum belly. Exhaust gasses are in the range of 1400-1600 degrees F and so you don't want them pointed at the airplane, unless perhaps it's made of titanium or inconel X. Maybe a good compromise might be to have the pipes exit at a slight angle away from the belly. BTW Kent's book offers a lot of tips applicable to any aircraft, to increase performance. I got my copy at buildersbookstore.com, if I remember correctly. Bill ----- Original Message ----- From: Subject: Tailwind-List: Exhaust Tailpipe Question > --> Tailwind-List message posted by: Mcculleyja@aol.com > > Does any measured temperature data or other information exist to identify how > far below the ship's belly the end of the tailpipe must be and how far ahead > of the start of the fabric it must terminate to avoid overheating the fabric? > Has anyone successfully (i.e. safely) run their tailpipe(s) essentially > parallel to the airflow below the belly to create less turbulence and to take > advantage of the available jet thrust from the exhaust gases exiting parallel > to the flight path? What are some typical measurements and angles at the > exit end of the pipes that existing installations use? > > Jim McCulley > (Seeing light ahead in the tunnel) > > ________________________________ Message 2 _____________________________________ Time: 01:30:08 PM PST US From: George Turner Subject: Re: Tailwind-List: Exhaust Tailpipe Question --> Tailwind-List message posted by: George Turner I believe Jim Clement's pipes exit where the engine air exits so they are not in the slip stream and they point mostly back and down a little. George....Phoenix William Bernard wrote:--> Tailwind-List message posted by: "William Bernard" Jim, A Mustang II builder named Kent Paser has done a lot of experimentation on going fast and has also written a book about it, "Speed With Ecomony" In his chapter on exhaust systems, he says the the exhaust pipes pointing parallel to the bottom of the fuselage give some 'jet thrust'. He also relates a story in which, during an experiment, the exhaust tips turned upward and melted the aluminum belly. Exhaust gasses are in the range of 1400-1600 degrees F and so you don't want them pointed at the airplane, unless perhaps it's made of titanium or inconel X. Maybe a good compromise might be to have the pipes exit at a slight angle away from the belly. BTW Kent's book offers a lot of tips applicable to any aircraft, to increase performance. I got my copy at buildersbookstore.com, if I remember correctly. Bill ----- Original Message ----- From: Subject: Tailwind-List: Exhaust Tailpipe Question > --> Tailwind-List message posted by: Mcculleyja@aol.com > > Does any measured temperature data or other information exist to identify how > far below the ship's belly the end of the tailpipe must be and how far ahead > of the start of the fabric it must terminate to avoid overheating the fabric? > Has anyone successfully (i.e. safely) run their tailpipe(s) essentially > parallel to the airflow below the belly to create less turbulence and to take > advantage of the available jet thrust from the exhaust gases exiting parallel > to the flight path? What are some typical measurements and angles at the > exit end of the pipes that existing installations use? > > Jim McCulley > (Seeing light ahead in the tunnel) > > --------------------------------- ________________________________ Message 3 _____________________________________ Time: 01:30:19 PM PST US From: George Turner Subject: Re: Tailwind-List: Exhaust Tailpipe Question --> Tailwind-List message posted by: George Turner I believe Jim Clement's pipes exit where the engine air exits so they are not in the slip stream and they point mostly back and down a little. George....Phoenix William Bernard wrote: --> Tailwind-List message posted by: "William Bernard" Jim, A Mustang II builder named Kent Paser has done a lot of experimentation on going fast and has also written a book about it, "Speed With Ecomony" In his chapter on exhaust systems, he says the the exhaust pipes pointing parallel to the bottom of the fuselage give some 'jet thrust'. He also relates a story in which, during an experiment, the exhaust tips turned upward and melted the aluminum belly. Exhaust gasses are in the range of 1400-1600 degrees F and so you don't want them pointed at the airplane, unless perhaps it's made of titanium or inconel X. Maybe a good compromise might be to have the pipes exit at a slight angle away from the belly. BTW Kent's book offers a lot of tips applicable to any aircraft, to increase performance. I got my copy at buildersbookstore.com, if I remember correctly. Bill ----- Original Message ----- From: Subject: Tailwind-List: Exhaust Tailpipe Question > --> Tailwind-List message posted by: Mcculleyja@aol.com > > Does any measured temperature data or other information exist to identify how > far below the ship's belly the end of the tailpipe must be and how far ahead > of the start of the fabric it must terminate to avoid overheating the fabric? > Has anyone successfully (i.e. safely) run their tailpipe(s) essentially > parallel to the airflow below the belly to create less turbulence and to take > advantage of the available jet thrust from the exhaust gases exiting parallel > to the flight path? What are some typical measurements and angles at the > exit end of the pipes that existing installations use? > > Jim McCulley > (Seeing light ahead in the tunnel) > > ---------------------------------