Thrust-Reverser?
 

I was just wondering...

Has anyone tried to install a thrust-reverser behind a model-turbine?

Thrust-Reverser?
 

Tam of "Tam's Thrust Tubes" fame was workin' on one. Maybe he'll chime in on this one??? :D

Attenuator
 

What I would really like to see is a thrust attenuator similar to the unit on the old Air Force T-37 Tweety Bird. Same problem as our model turbines, lots of residual thrust at idle. With the T-37 the solution was to just extend a panel right smack into the exhaust of the turbine at idle, effectively reducing the thrust to zero.

It would be very easy to turn the same attenuator into a thrust reverser by simply making it into a two-piece clam shell "bucket" similar to the unit used on a DC-9.

I believe that on an airliner reverse thrust is achieved when the throttles are brought back past the idle detents. How this would be done with model jets is a good question but something worth thinking about.

Thrust-Reverser?
 

Well,
I been so busy. To many things going on and little time to do it. Haven't got a chance to make the proto type.
So far I only got the drawing done.
My idea to make this thrust reverser to work as brake and also maked safe to operate without deploying during flight.
I hope to get this project done before mini Tam due.

Brg,
Tam

Thrust-Reverser?
 

When is mini-Tam due ? Is Jazzy huge yet ?

(Be careful - the answer might be taken as an "Upcoming Product Announcement" ;))

Hope you're settling in well in your new location.

Gordon

Thrust
 

I don't think Jazzy is that big, saw her a 2 weeks ago, But I do like the name Mini Tam-------- I thought you were going to call him Maverick :D The thing with the reverser's, can our fuse take the heat?

Dave R

Thrust-Reverser?
 

Actually, the thrust reversers on most of the older airliners (707s, 27s, older 37s, most DC variants, etc.) work off of another set of levers attached to the throttles in the cockpit. Upon landing, while the engines are brought back to idle, this second set of levers rotates up, and as these reverser levers are pushed up and forward, they push the throttle levers back up to a certain setting for reverse thrust. The reverser clamshells are operated by these levers. On new airliners such as the Airbus, etc. I believe the reversers are actually computer controlled, as are all the other systems onboard. Maybe a set could be designed to servo operated off of another channel, or some type of microswitch activation of the servos that operate the reversers. Might be something for someone to pay around with and try.

Thrust-Reverser?
 

Gordon,
Baby Sean is due in mid April. Jazzy only gain 10 lb so far.
Jazzy and baby do very well. The doctor said Sean is very healthy and strong heart beat.
Well that for the good news.

Here is the bad news.

Today at 3. Bad accident happen right in front of my eye. I let my little best friend out to do her things. The minute I open the door. The reckless contrution worker ramp up the engine and speed his truck up to 40mph at resident street. Mimi (my dog name) ran out to chase them. She got hit. I ran out pick her up. She died a minute later in my arms.
I'm broken down and cry. She been with me almost 2 years. She is very attaching with me. Where ever I go. She always with me. Special last year. I work alone at the shop. She is only friend around kept me company.
I call back to SJ to break the bad news to Jazzy. She cry very hard.
Mimi is just like one of our kid in the family. Me and Jazzy love her so much. We decided to burried her in our backyard. This is her home too.
Tonight go to be tough. Mimi always jump on to bed and sleep next to my feets.
From now on my feets go to be cold at night. :(

I didn't call police to site the driver. He feel really sorry for what he did.
I hope he learn something today. Today he hit my dog not one the kid. Hope he be really carefull driving in the resident st.
Specialy with many fullsize pick-up truck park on the sidewalk. Hard to see anything coming out.

Goodnight everyone.
Tam

Thrust-Reverser?
 

Sorry to here of your loss, Tam. Just be glad it wasn't a "Mini Tam". Again Sorry to hear it. :(

Thrust-Reverser?
 

Sorry to hear of your loss Tam, my heart goes out to you and your wife :(
Todd

Thrust-Reverser?
 

Thanks guys.
Tam

Thrust-Reverser?
 

Tam my buddy, Sorry to hear about your loss. I loved Mimi too, she used to attack my feet. I am very sad to see her go. But, We are always here for you man.

Thrust-Reverser?
 

Is eliminating residual thrust in our models a good idea?

Out jets are so heavily loaded that one needs some thrust to keep it flying, so the 1 lb or less is actually good to have during landing. The planes I fly have flaps/speedbrakes and they seem to work well for their intended purpose. Having no thust at idle by use of such a device will force you to use less flaps (good and bad) and if you have to go around, now you have remember to turn it off before applying throttle....now I know in my field I DO NOT have the time to do that and would rather come in with SOME throttle to keep the turbine ready for a go around!!! just a thought!!

Thrust-Reverser?
 

Ehab:

I see your point, and yes, a bit of residual thrust is good. But in the case of thrust reversers, they are not deployed until the aircraft is already on the ground, after the point that a go around is no longer an option. They are used in conjunction with brakes to slow the aircraft. In all actuality, they would not be of any great benefit on our models, except for greater scale authenticity on some aircraft. Even at 30 or 40 pounds, a turbine model is not hard to stop once it is on the ground. Airliners and other large aircraft use them because of the weight of the aircraft, and the rolling mass that you are trying to slow down and stop. Using brakes alone, it is hard to shut an airliner, or even some corporate jets on the shorter runways. I dont know of any military fighter type aircraft that use reversers. Some of them use thrust attenuators and drogue chutes, like the F-4, F-15, etc. but only the heavy iron like the KC-10, KC-135, AWACs, and large transports use actual reversers on their engines. It would be pretty cool to have a set on a scale model that actually work, though. :D

Thrust-Reverser?
 

Both Saab JA-37 Viggen and Panavia Tornado has thrustreversers.

Thrust-Reverser?
 

Ooops! Forgot about those two! Dont know why I overlooked the Tornado, it is one of my alltime favorites. Awesome aircraft!

Thrust-Reverser?
 

I agree... It's awesome alright!