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Old Jun 23, 2012, 08:27 PM
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United States, TX, League City
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Gonna put this out there just to tease people

itll be operated using 2 servos on each engine, and using a "clamshell" type of thrust reversing. if it isnt reversing anything itll be for show/noise choking the EDF lol

Edit: it actually works on bench testing
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Old Jun 23, 2012, 08:55 PM
6 months to finish a rtf
pulsery2k1's Avatar
upstate ny
Joined Jun 2003
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hi2nr

nice work , now you have to program the spoilers and thrust reverse
to deploy as soon as the main's touch down .

to be honest our runway is short and working reverser or brakes
would be helpful
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Old Jun 24, 2012, 01:24 AM
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Quote:
Originally Posted by hi2nr View Post
Gonna put this out there just to tease people

itll be operated using 2 servos on each engine, and using a "clamshell" type of thrust reversing. if it isnt reversing anything itll be for show/noise choking the EDF lol

Edit: it actually works on bench testing
Hi2nr...

You're killing our reputations out here man- you gotta quit with these mods we've all been thinking about and you just randomly post an "oh by the way..."

In all seriousness- cool thought on the reversers- the CFM56s on 737 use a slide type reverser, but yours look the part. I lost sleep a few nights back thinking about a slide type reverser (which would be the holy grail of RC EDF reversers) but am far from a prototype yet. You've got a big lead man- well done again.

(Oh yeah...and just in case you get any crazy ideas...don't think you're the only one with an RC skunkworks lab... I'm working on something so secret, even I havent thought of it yet. )
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Old Jun 24, 2012, 06:59 AM
Don't Move I've Dropped My Nut
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Quote:
Originally Posted by Doug W View Post
Hi2nr...

You're killing our reputations out here man- you gotta quit with these mods we've all been thinking about and you just randomly post an "oh by the way..."

In all seriousness- cool thought on the reversers- the CFM56s on 737 use a slide type reverser, but yours look the part. I lost sleep a few nights back thinking about a slide type reverser (which would be the holy grail of RC EDF reversers) but am far from a prototype yet. You've got a big lead man- well done again.

(Oh yeah...and just in case you get any crazy ideas...don't think you're the only one with an RC skunkworks lab... I'm working on something so secret, even I havent thought of it yet. )
I've also lost sleep on those sliding. reversers. I think I will do some "tinkering" with the two EDF/pylons from my wrecked Alaska Airlines 737 before salvageing the EDF units out of them for my new 737 build (which came yesterday from Ming)

BTW, Doug, I'm considering decorate it as a 737 BBJ instead of an "airline" livery. I'll also flap it
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Old Jun 24, 2012, 08:40 AM
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Slide reversers are possible if I had access to a CNC machine I'd build one that uses 1 servo to actuate. The design is so simple you'd say 'doh' lol

As for the engine, I'll be extending the cowling to resemble whatever engine seen in the picture instead of the Cfm56. It'll give me that nice thin cowl in the back
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Old Jun 24, 2012, 12:34 PM
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Quote:
Originally Posted by hi2nr View Post
Slide reversers are possible if I had access to a CNC machine I'd build one that uses 1 servo to actuate. The design is so simple you'd say 'doh' lol

As for the engine, I'll be extending the cowling to resemble whatever engine seen in the picture instead of the Cfm56. It'll give me that nice thin cowl in the back
It is actually a CFM56-5C4 (the photo is an A340-300). It's just that 737s incorporate different reversers.
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Old Jun 24, 2012, 12:38 PM
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Originally Posted by bamaguy View Post
BTW, Doug, I'm considering decorate it as a 737 BBJ instead of an "airline" livery. I'll also flap it
Well, if you're looking for a challenging BBJ scheme, look no further...
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Old Jun 24, 2012, 01:19 PM
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It is actually a CFM56-5C4 (the photo is an A340-300). It's just that 737s incorporate different reversers.
This is what I'm after, looks like a 737 to me but I could be wrong lol
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Old Jun 24, 2012, 01:32 PM
Don't Move I've Dropped My Nut
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IMO; Nope, looks like an AirBus, A320 type, because of the contour of the engine pylon (the 737 competitor)
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Old Jun 24, 2012, 01:36 PM
An unexpected error occurred
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Yep, A320. The double winglets give it away...
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Old Jun 24, 2012, 01:41 PM
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But it's the same CFM56 engine...
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Old Jun 24, 2012, 01:45 PM
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You guys are gonna make me use the machines at work to make sliding reverse thrust lol. But I guess I shouldn't care if I can get a dust cloud when I land hehe
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Old Jun 24, 2012, 01:55 PM
Don't Move I've Dropped My Nut
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But it's the same CFM56 engine...
Yes, same engine...just that Boeing does not use that variant on the 737-700's

I can come up with a good sliding mechanism, (brass and/or carbon fiber tube and rod) but I do not know how the diversion of the gasses is accomplished.

Can't wait to see how hi2nr does the sliding reverser!!
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Old Jun 24, 2012, 02:49 PM
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It probably wouldn't be worth machining for this size EDF. The design would be a scaled down version of a pop up steamer, when the engine cowl slides back it's hinged to 4 of the pop up diverters and flare the rest out blocking the entire exit duct forcing air up and forward.

For now I think I'll stick with my engine swapped 737 :P until I can make sure it flys well enough. Might order another one soon and design a flap in the exhaust duct that folds shut or open with actuation of the rear cowl sliding. It would suck if I had a impeller explosion though lol
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Old Jun 24, 2012, 03:23 PM
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Everett, WA
Joined Aug 2002
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737NG thrust reverser

Here is a diagram of typical thrust reversers.

https://engineering.purdue.edu/~prop...treverse1.html

737NG (-700/-800/-900) uses the cascade type reverser as shown on the bottom of the picture (shaded in blue) Blocker doors are deployed to block teh fan-air and diverted through the cascades.

The 4-door reverser as shown on EasyJet is an A320 reverser.
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