Thrust Reversers
03-23-2009, 09:36 AM
#2
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RE: Thrust Reversers
I was thinking about this the other day.
I remember the old Byron BD-5 used to have an operational clamshell that worked great.
I'm going to see if I can talk Sean into making something with all the cool tools he has
I remember the old Byron BD-5 used to have an operational clamshell that worked great.
I'm going to see if I can talk Sean into making something with all the cool tools he has
03-23-2009, 09:40 AM
#4
RE: Thrust Reversers
Really Tam would be the right guy to do this. Some welded stainless steel would work perfect. The problem is you would be essentially adding more tailcone to the engine, what does that do for thrust loss??? Maybe it's just like adding a small pipe, meaningless. You're only gonna be able to do this on outside mounted engines (sorry, a shockjet would not work either).
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
03-23-2009, 09:51 AM
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RE: Thrust Reversers
ORIGINAL: seanreit
Really Tam would be the right guy to do this. Some welded stainless steel would work perfect. The problem is you would be essentially adding more tailcone to the engine, what does that do for thrust loss??? Maybe it's just like adding a small pipe, meaningless. You're only gonna be able to do this on outside mounted engines (sorry, a shockjet would not work either).
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
Really Tam would be the right guy to do this. Some welded stainless steel would work perfect. The problem is you would be essentially adding more tailcone to the engine, what does that do for thrust loss??? Maybe it's just like adding a small pipe, meaningless. You're only gonna be able to do this on outside mounted engines (sorry, a shockjet would not work either).
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
03-23-2009, 10:03 AM
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RE: Thrust Reversers
ORIGINAL: seanreit
You don't find this device on any fighter jets that I'm aware of.
You don't find this device on any fighter jets that I'm aware of.
http://www.youtube.com/watch?v=Fye_2AipFTA
03-23-2009, 10:03 AM
#8
RE: Thrust Reversers
ORIGINAL: seanreit
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
You don't find this device on any fighter jets that I'm aware of.
Then there is also the AMA rule that excludes this to contend with.
See this video w/ a SAAB J37 Viggen STOL operation (2000ft TO/LDG)[link]http://www.youtube.com/watch?v=zpxz_-ELi6U[/link]
Clamshell reversers (3). Since we who live in the "free world"
regarding to imposed AMA regulations on speed, afterburners, reversers etc. we can add these devices, I know of at least one who built working reversers in his Viggen.Regards Thomas
03-23-2009, 10:07 AM
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RE: Thrust Reversers
Yeah, Unfortunately this seems to be the case...
The following has been copied directly from the AMA Form# 510-A (SAFETY REGULATIONS FOR MODEL AIRCRAFT POWERED BY GAS TURBINES) Paragraph 13...
Bummer [>:]
George
The following has been copied directly from the AMA Form# 510-A (SAFETY REGULATIONS FOR MODEL AIRCRAFT POWERED BY GAS TURBINES) Paragraph 13...
13. Afterburners are prohibited. Other special controls such as water injection, thrust reversers,
variable nozzles, etc. are acceptable only if engine manufacturer provided and supported by
development testing and user training.
variable nozzles, etc. are acceptable only if engine manufacturer provided and supported by
development testing and user training.
George
03-23-2009, 10:24 AM
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RE: Thrust Reversers
Switch to EDF, then you can do it.....although there may not be a need to....
It would have to be an engineered system to fit a specific application..it is not just a matter of throwing clam shell doors in the exhaust stream.....you have to consider what is going to happen to the deflected exhaust..is it going to recirculate back into the intakes and cause a compressor stall (F-35), will it impinge on the model's structure and start to melt stuff (My son flies a full scale and they can't use reverse thrust below 40 knots as the carbon fiber stuff and cabin windows start melting...what about debris and fod that are kicked up? will the added back pressure cause blowback into the fuselage? (that would be interesting in a non bypass system...) Lots to think about......
It would have to be an engineered system to fit a specific application..it is not just a matter of throwing clam shell doors in the exhaust stream.....you have to consider what is going to happen to the deflected exhaust..is it going to recirculate back into the intakes and cause a compressor stall (F-35), will it impinge on the model's structure and start to melt stuff (My son flies a full scale and they can't use reverse thrust below 40 knots as the carbon fiber stuff and cabin windows start melting...what about debris and fod that are kicked up? will the added back pressure cause blowback into the fuselage? (that would be interesting in a non bypass system...) Lots to think about......
03-23-2009, 12:12 PM
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03-23-2009, 12:28 PM
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RE: Thrust Reversers
Hi Pat,
the guy is Alfred Kittelberger from Hamburg /Germany ( or nearby),
here is the link to his local club:
http://www.mfg-ramelsloh.de/
sabre61
the guy is Alfred Kittelberger from Hamburg /Germany ( or nearby),
here is the link to his local club:
http://www.mfg-ramelsloh.de/
sabre61
