Profile image

Boeing 727-25C

26.5k Sunnyskies  2.4 years ago

After much toil and labor, here is my 727-25C, uploaded on the 27th no less, which is, coincidentally, also my birthday!

Though it has gone by the wayside, this unforgettable trijet workhorse is still used today by a handful of obscure operators. Be it passengers or cargo, this hardy jet was always ready to deliver. The 727 is very close to my heart personally. Over the past year, I've been at school in an aviation maintenance program, working my hardest to get my A&P and enter the workforce to become a skilled mechanic. One of the planes my school uses for training is an old retired 727-25C, which, if you weren't familiar with 727s, is one of the many variants within the 727-100 family. Though it smells, leaks Skydrol everywhere, is missing a lot of its guts and trim, has rusty and binded control cables, and is infested with birds, the experience I've gained so far working on it has been invaluable. That's why this 727 sports the one-of-a-kind livery that my school's 727 wears. That lovely plane will never fly again, but now it can continue to fly in spirit through all of you who will download and test-fly my creation.

As for the model itself, the shape is extremely close, and the size is only a few feet off. The weight is about as close as I could get it, and is loaded with a little more than half the 727's maximum fuel capacity. The plane is brimming with features and cosmetic trimmings. It has all 4 sets of its triple-slotted Fowler flaps, spoilers, slats, leading-edge flaps, clamshell thrust reversers, landing gear with independent wheel-bay doors, retracting tailskid, airstairs, trimming stabilizer, accurate lights and radio masts, and other nonsense I'm probably forgetting.

Operation Details:
All moving parts (aside from landing gear) are controlled by VTOL down, there's no reason to ever slide it up.
AG1 controls flaps and slats, and allows the outboard ailerons to be moved (727 outboard ailerons only move when flaps are deployed)
AG2 controls spoilers
AG3 deploys thrust reversers
AG4 turns on nav and anti-collision lights
AG5 turns on landing and taxi lamps as well as the wing inspection lights
AG6 controls the aft airstairs
AG7 locks and unlocks the landing gear and tailskid
AG8 locks and unlocks the landing gear doors

To properly use the landing gear:
On the ground press GEAR to close the doors.
To retract gear, press in sequence: GEAR - (7+8) - GEAR - (7+8)
To extend gear, press in sequence: GEAR - (7+8) - (7+8) - GEAR
These sequences will actuate the landing gear parts similarly to the real thing.
Or just keep 7 and 8 armed and ignore the proper sequence. Everything has no collision, so it will still work fine.

Flying:
Rotate around 130 mph with 75% nose-up trim on takeoff. Cruise is at 35,000ft, but efficiency will increase as you climb higher. Stall speed is 100 mph at maximum nose-up trim, with control waning below 130 mph. Best touchdown speed is 140 mph. Trim is your friend, and is absolutely critical to getting the most out of the 727. You should be constantly adjusting trim throughout all stages of the flight. Be mindful of the engines. They take a little while to spool up and down. At touchdown, zero throttle and deploy thrust reversers. Cut reversers at around 40 mph. Flaps and spoilers don't actually do anything. In fact, flaps actually add a slight nose-down tendency. At least they look cool when deployed (they look a little weird in transit due to the rotators that correct for sweep angle not syncing with the hinges and pistons in actuation speed. They'll always line up in the end at every flap angle though).

Throttles:
Takeoff and climb - 100%
Level cruise - ~75% depending on altitude
Descent - 25%
Approach - 10-40% depending on angle
Go around - 100%
Taxi - <5%

Random notes:
The airstair can be used to put the nose down if the plane ends up sitting on its tail.
The plane can pick up impressive speeds in high-altitude dives. In real life, that usually rips the plane to shreds. Good thing this is a game.
The paintjob isn't 100% accurate to its real-life counterpart. There is an angle between the white and green that traces the angle of the tail's leading edge, and it was too difficult to replicate without adding too many pointless extra parts.
I was too lazy to put limiters on the actuators for the flaps (again), so don't move the VTOL slider up unless you want to break them.
If you have any questions about 727s, I'd be happy to answer them. I know a great deal about them, and have access to the official 727-100 maintenance manual to dig out really specific facts.

Anyway, this was my biggest project yet, and probably my last super-accurate replica for a while. Hope you like it!

Spotlights

General Characteristics

  • Created On Windows
  • Wingspan 105.5ft (32.2m)
  • Length 130.4ft (39.7m)
  • Height 33.2ft (10.1m)
  • Empty Weight 92,938lbs (42,156kg)
  • Loaded Weight 124,121lbs (56,300kg)

Performance

  • Power/Weight Ratio 0.651
  • Wing Loading 37.2lbs/ft2 (181.7kg/m2)
  • Wing Area 3,335.7ft2 (309.9m2)
  • Drag Points 43724

Parts

  • Number of Parts 466
  • Control Surfaces 19
  • Log in to leave a comment
  • Profile image
    6,602 Sinacraft

    No Problem and very good. Thanks!

    1.7 years ago
  • Profile image
    26.5k Sunnyskies

    @Thebossrevolution101 No biggie, bro.

    1.7 years ago
  • Profile image

    Ohh shit I didn’t think that you were actually a mechanic sorry. I thought you were just some idiot that was acting like they knew what they were talking about. :(@Sunnyskies

    1.7 years ago
  • Profile image
    26.5k Sunnyskies

    @Thebossrevolution101 If you don't aim for accuracy when making a replica, you're not doing the plane justice. Besides, having access to engineering drawings is just my prerogative as an actual certified aircraft mechanic. If I have the tools, I'll use them.

    1.7 years ago
  • Profile image
    26.5k Sunnyskies

    @QingyuZhou Hey, thanks! I put quite a bit of effort into this one.

    1.7 years ago
  • Profile image

    Omg dude shut up no one cares about the blueprints @Sunnyskies

    1.7 years ago
  • Profile image
    160k QingyuZhou

    727! I can't make a plane this good 9 months ago.

    1.7 years ago
  • Profile image
    26.5k Sunnyskies

    @Hooded Thanks!

    1.7 years ago
  • Profile image
    1,179 Hooded

    I wished I could have flown on older jets, but this is the best and most accurate 727 I've seen. @Sunnyskies

    1.7 years ago
  • Profile image
    26.5k Sunnyskies

    @Hooded The design was based on blueprints and official maintenance manuals. Having seen the wings up close in real life, as well as having personally operated all their parts really helped as well.
    The only real inaccuracy here is the thrust reversers. The engines on the -25C were the JT8D-7B, which used the internal clamshell and cascade vane type reversers, not the older bucket type used here. It was more fun to build the buckets, and they look cooler, so that's why I installed them on this model.

    1.7 years ago
  • Profile image
    1,179 Hooded

    Finally, someone who got the wings right!

    1.7 years ago
  • Profile image
    82.0k MrSilverWolf

    @Sunnyskies oh ok, yeah I did something very similar to that for the stairs on mine

    2.4 years ago
  • Profile image
    26.5k Sunnyskies

    @MrSilverWolf I built the entire assembly away from the fuselage so it couldn't get stuck to anything, then I calculated the nudge interval to get it in place, and finally I used fine-tuner to nudge each part that exact distance. The steps are just rotated blocks. All the parts have collision disabled.
    I used a similar technique on most of the moving parts of this plane.
    @Magiccuber33 Thanks!

    2.4 years ago
  • Profile image
    76.5k MAHADI

    @Sunnyskies no problem... but you can mention only 3 users in a comment...

    2.4 years ago
  • Profile image
    82.0k MrSilverWolf

    I didn't even notice the stairs at the back, awesome addition! Just out of curiosity, how did you get those in there, I added stairs on my 727 I made a couple months ago and I'm just curious to know if there is a better or easier way of getting them in there

    2.4 years ago
  • Profile image

    Love It one of the best planes I've ever flown!
    Nice job!

    2.4 years ago
  • Profile image
    26.5k Sunnyskies

    @Thomasj041 It is. You have to arm it with AG7. It's in the instructions!
    @Planefun MVCC
    @ForeverPie @Ryn176 @MAHADI @ChiChiWerx Thanks all!

    2.4 years ago
  • Profile image
    87.1k ForeverPie

    wow... This is platinum level building...

    2.4 years ago
  • Profile image

    @MAHADI Thank you both :D it really deserves it

    2.4 years ago
  • Profile image
    6,345 Ryn176

    Wow! This is amazing!

    2.4 years ago
  • Profile image
    76.5k MAHADI

    don't worry, I and Feanor did it... @FennVectorCWA

    2.4 years ago
  • Profile image
    76.5k MAHADI

    AWESOME...

    2.4 years ago
  • Profile image

    someone must spotlight this!

    2.4 years ago
  • Profile image
    82.0k MrSilverWolf

    @Sunnyskies no problem!

    2.4 years ago
  • Profile image
    17.7k Thomasj041

    The raising of the landing gear should be bound to the gear button.

    2.4 years ago
  • Log in to see more comments