Jet exhaust tube
02-06-2011, 05:06 PM
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Jet exhaust tube
Its probly a stupid question , here goes What would happen if I took the outer tube off and used only one tube but covered it with a thermal blanket for the heat? The reason is to save weight in the rear of jet.
02-06-2011, 05:27 PM
#2
RE: Jet exhaust tube
au contrere my friend , that's the way it was done long ago before the advent of the double wall pipe. it was heavy , and somewhat unreliable if you did'nt get it right . it was also a pain to get it right in terms of attaching to the turbine nozzle and exhaust ends. do yourself a favor and do the double wall pipe, air , in fact is a great insulator
02-07-2011, 12:10 AM
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RE: Jet exhaust tube
ORIGINAL: luckyy
Its probly a stupid question , here goes What would happen if I took the outer tube off and used only one tube but covered it with a thermal blanket for the heat? The reason is to save weight in the rear of jet.
Its probly a stupid question , here goes What would happen if I took the outer tube off and used only one tube but covered it with a thermal blanket for the heat? The reason is to save weight in the rear of jet.
I would have thought that the weight of the thermal blanket would be more than the weight of the outer wall of the pipe.
Dennis
02-07-2011, 02:49 PM
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RE: Jet exhaust tube
At least he is interested in saving weight most guys are prefer to load their jets up with powerboxes and other gismos making their jets much heavier than they should.
I have a flash that is 4lb lighter than one at the last meet I was at with the same turbine, just because of all his toys!
I have a flash that is 4lb lighter than one at the last meet I was at with the same turbine, just because of all his toys!
02-12-2011, 12:28 PM
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RE: Jet exhaust tube
Sailing1,
I've followed your advice from this and previous threads and ordered (and just received) a Tam pipe for the Flash. It looks great and is certainly lighter then the stock.
This is my first jet, so I am not sure how to install Tam’s pipe, when compared to the instructions for the stock pipe. I was hoping you could enlighten me. Do you have any diagram, or picture showing the installation? For example, is the bellmouth supposed to be on the inside or the outside of Tam's pipe (mine doesn't fit outside)? Where am I supposed to attach the two metal flanges from Tam’s pipe - to the bellmouth or to the bulkhead? In which position am I supposed to attach the flanges (e.g. 10 and 2 o'clock, or 4 and 8 o'clock)? Should I use rivets to attach them - if not, what have you used? I understand that I am not supposed to install the stock outer tube as well (which would fit), nor any blanket - am I correct? In that case, how do I fix the bellmouth to the bulkhead and how do I center Tam’s pipe within the exhaust nozzle?
Sorry for the many questions, but I assume that they should be easy to answer.
Thank you,
Beavis
I've followed your advice from this and previous threads and ordered (and just received) a Tam pipe for the Flash. It looks great and is certainly lighter then the stock.
This is my first jet, so I am not sure how to install Tam’s pipe, when compared to the instructions for the stock pipe. I was hoping you could enlighten me. Do you have any diagram, or picture showing the installation? For example, is the bellmouth supposed to be on the inside or the outside of Tam's pipe (mine doesn't fit outside)? Where am I supposed to attach the two metal flanges from Tam’s pipe - to the bellmouth or to the bulkhead? In which position am I supposed to attach the flanges (e.g. 10 and 2 o'clock, or 4 and 8 o'clock)? Should I use rivets to attach them - if not, what have you used? I understand that I am not supposed to install the stock outer tube as well (which would fit), nor any blanket - am I correct? In that case, how do I fix the bellmouth to the bulkhead and how do I center Tam’s pipe within the exhaust nozzle?
Sorry for the many questions, but I assume that they should be easy to answer.
Thank you,
Beavis
02-12-2011, 12:39 PM
#11
RE: Jet exhaust tube
As I understand it, the pipe will stay considerably cooler as a double-wall... the venturi effect of cool air travelling through the wall space is it's secret. Blanketing the single wall pipe just keeps it insulated... and hotter.
02-12-2011, 12:47 PM
#12
RE: Jet exhaust tube
ORIGINAL: Beavis
Sailing1,
I've followed your advice from this and previous threads and ordered (and just received) a Tam pipe for the Flash. It looks great and is certainly lighter then the stock.
This is my first jet, so I am not sure how to install Tam’s pipe, when compared to the instructions for the stock pipe. I was hoping you could enlighten me. Do you have any diagram, or picture showing the installation? For example, is the bellmouth supposed to be on the inside or the outside of Tam's pipe (mine doesn't fit outside)? Where am I supposed to attach the two metal flanges from Tam’s pipe - to the bellmouth or to the bulkhead? In which position am I supposed to attach the flanges (e.g. 10 and 2 o'clock, or 4 and 8 o'clock)? Should I use rivets to attach them - if not, what have you used? I understand that I am not supposed to install the stock outer tube as well (which would fit), nor any blanket - am I correct? In that case, how do I fix the bellmouth to the bulkhead and how do I center Tam’s pipe within the exhaust nozzle?
Sorry for the many questions, but I assume that they should be easy to answer.
Thank you,
Beavis
Sailing1,
I've followed your advice from this and previous threads and ordered (and just received) a Tam pipe for the Flash. It looks great and is certainly lighter then the stock.
This is my first jet, so I am not sure how to install Tam’s pipe, when compared to the instructions for the stock pipe. I was hoping you could enlighten me. Do you have any diagram, or picture showing the installation? For example, is the bellmouth supposed to be on the inside or the outside of Tam's pipe (mine doesn't fit outside)? Where am I supposed to attach the two metal flanges from Tam’s pipe - to the bellmouth or to the bulkhead? In which position am I supposed to attach the flanges (e.g. 10 and 2 o'clock, or 4 and 8 o'clock)? Should I use rivets to attach them - if not, what have you used? I understand that I am not supposed to install the stock outer tube as well (which would fit), nor any blanket - am I correct? In that case, how do I fix the bellmouth to the bulkhead and how do I center Tam’s pipe within the exhaust nozzle?
Sorry for the many questions, but I assume that they should be easy to answer.
Thank you,
Beavis
Dario, Congrats on your new Flash
.A modeler here on RCU named BigBri... I think you met him at an event, just got his Flash in as well... He's a local jet guy that can answer any immediate questions about the Flash you may have. I'll PM him to get you in touch with him.
02-12-2011, 05:29 PM
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RE: Jet exhaust tube
Hey Mike,
Great to hear from you.
Thank you for your kind words and for always being so helpful to a rookie like me. I do appreciate all that. I may bug you with a few more questions, in addition to the many I swamped you with at the last Plum Island meet.
I look forward to flying with you and the other local guys before too long.
Best,
Dario
Great to hear from you.
Thank you for your kind words and for always being so helpful to a rookie like me. I do appreciate all that. I may bug you with a few more questions, in addition to the many I swamped you with at the last Plum Island meet
. I look forward to flying with you and the other local guys before too long.
Best,
Dario
02-13-2011, 01:53 AM
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RE: Jet exhaust tube
The double wall stainless inner / aluminium outer is the way to go. the cooling effect let you touch the alu while the engine is running !
...andif correctly made, lighter than the blanket version...
Mav
02-20-2011, 12:51 PM
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RE: Jet exhaust tube
What about the tube diameter, what turbine are you using? maybe you can go down diameter if your pipe is designed for use with larger turbines might save another bit of weight
02-20-2011, 03:01 PM
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RE: Jet exhaust tube
Just to add a little perspective, I always use Wren single wall pipes. They supply an aluminium foil backed ceramic blanket which is only about 3/32 ins thick. No heat problems on any of my planes, including a Flash. Twin wall pipes are far more expensive and so us pensioners find the economical solutions. My Comp' arf flash twin wall pie was 3 times as heavy. Its only the use of very thin guage outer tubing that provides the advantage so you pays your money etc etc. Ron
02-20-2011, 03:02 PM
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RE: Jet exhaust tube
Just to add a little perspective, I always use Wren single wall pipes. They supply an aluminium foil backed ceramic blanket which is only about 3/32 ins thick. No heat problems on any of my planes, including a Flash. Twin wall pipes are far more expensive and so us pensioners find the economical solutions. My Comp' arf flash twin wall pie was 3 times as heavy. Its only the use of very thin guage outer tubing that provides the advantage so you pays your money etc etc. Ron
02-21-2011, 05:19 PM
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RE: Jet exhaust tube
ORIGINAL: ron Sweeney
Just to add a little perspective, I always use Wren single wall pipes. They supply an aluminium foil backed ceramic blanket which is only about 3/32 ins thick. No heat problems on any of my planes, including a Flash. Twin wall pipes are far more expensive and so us pensioners find the economical solutions. My Comp' arf flash twin wall pie was 3 times as heavy. Its only the use of very thin guage outer tubing that provides the advantage so you pays your money etc etc. Ron
Just to add a little perspective, I always use Wren single wall pipes. They supply an aluminium foil backed ceramic blanket which is only about 3/32 ins thick. No heat problems on any of my planes, including a Flash. Twin wall pipes are far more expensive and so us pensioners find the economical solutions. My Comp' arf flash twin wall pie was 3 times as heavy. Its only the use of very thin guage outer tubing that provides the advantage so you pays your money etc etc. Ron
02-26-2011, 09:37 AM
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RE: Jet exhaust tube
A good double walled pipe does not need to be heavier than a single walled.Its the correct choice of materials.
Wrapping "something" around a single wall pipe is stone age technology and has no cooling effect ! As someone said earlier in this forum - it is just isolating a pipe that is even hotter...
Ilja
Wrapping "something" around a single wall pipe is stone age technology and has no cooling effect ! As someone said earlier in this forum - it is just isolating a pipe that is even hotter...
Ilja
