RunRyder RC
WATCH
 4 pages [ <<    <     1     ( 2 )     3      4     NEXT    >> ] 8483 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why real heli do not have flybar
04-11-2014 03:28 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
AirWolfRC, you used the terms teetered rotor head and semi-rigid rotor head in reference to right side up and upside down horizontal stabs on the tail like they were two different types of rotor systems when they are the same. Did you mean to say semi-rigid/teetered and articulated?
Every industry likes to invent new words or definitions for what it does. Makes it sound more mysterious.

I'm talking about the rotor head difference between a Bell47/UH1/AH1 and UH60/CH46/CH47/CH53
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-11-2014 10:42 PM  5 years ago
Vaderluck

rrApprentice

Melbourne - Australia

MyPosts All Forum Topic
Has anyone experiment with replacing a flybarless gyro with a flybar gyro (ie. normal tail gyro) on a DFC heli ?
It will probably fly ok on large heli like 600 or 700 ???
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 10:48 PM  5 years ago
JKos

rrProfessor

Redondo Beach, CA

MyPosts All Forum Topic
Has anyone experiment with replacing a flybarless gyro with a flybar gyro (ie. normal tail gyro) on a DFC heli ?
That's where RC augmented FBL began! Rewind history (do some searching) and you'll find it back there somewhere.

- John
RR rules!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 10:59 PM  5 years ago
philip 01

rrElite Veteran

ft worth

MyPosts All Forum Topic
The SCAS system and many like it have been around for a long, long time.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-11-2014 11:42 PM  5 years ago
Trexwilly

rrVeteran

FL USA

MyPosts All Forum Topic
I took a couple of lessons in a Bell 47, it had a flybar, the instructor had me bang on it, during preflight, I don't remember why?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 12:42 AM  5 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
here is another Huey Head, it is slightly different than the other Huey Head I posted, I believe this is an older head, notice the Hirobo Grips

Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 12:48 AM  5 years ago
Chuck Bole

rrElite Veteran

Tulsa Ok. U.S.A.

MyPosts All Forum Topic
Anybody remember this?
http://www.rcgroups.com/forums/showthread.php?t=500904

chuck
Team Synergy Field Representative / Scorpion / Thunder Power
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-12-2014 01:05 AM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
Many full-scale helicopters do have flybars (Stabilizer bar).
List some modern helos. The UH-1 Huey isn't modern.
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 01:08 AM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
Why is there a up-side-down airfoil on the tail boom producing down force on helis with a tetering head ?
To provide down force on the tail boom aft of the CG to provide a more comfortable nose level attitude at cruise.
And a right-side-up airfoil producing up force on a semi-rigid rotor head ?
Which helo? The Bell 206 head is both teetering (underslung) and semi-rigid. It has the upside down airfoil of which you speak.
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 01:14 AM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
It also has a lot to do with the head most full scale are running multi bladed heads. If you had a 4 bladed head on yours you would have a pretty stable bird without the need for a flybarless system. Would just be that much more drag and strain on the system. Which is why most 3d helis only have 2 blades.
Then explain why two of the most popular two bladed helis in history (Bell 206 Jet Ranger and Robinson R22/44) don't have flybars.
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 02:58 AM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
The difference is the up-side-down foil at the tail counters the air drag on the fuselage to help keep the fuselage perpendicular to the rotor disk because the mast is basically on a "free" pivot hanging under the rotor head.

The other way is also sometimes represented by a down angled tail rotor providing up force to help counter the tendancy of the rotor disk to pitch up in forward flight. This helps with the overall aerodynamic efficiency.
See the CH-53E
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-12-2014 04:50 AM  5 years ago
UH-60PILOT

rrVeteran

Seoul, South Korea

MyPosts All Forum Topic
OK AirWolfRC, just to set the record straight none of those are new or mysterious terms related to rotor systems. Teetered and Semi-Rigid are the same thing. The Bell 47/UH-1/AH-1 all have the teetered/semi-rigid design and the UH-60/CH-46/CH-47/CH53 all have fully articulated heads.Kenny Thompson
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 06:24 AM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
The difference is the up-side-down foil at the tail counters the air drag on the fuselage to help keep the fuselage perpendicular to the rotor disk because the mast is basically on a "free" pivot hanging under the rotor head.
I believe the word you are looking for is "parallel". And, even that's still not entirely true. A forward tilted rotor disk in forward flight with an accompanying nose down attitude of the fuselage is undesirable, hence the "upside down airfoil" back on the tail boom which helps keep the nose up and more "parallel" with the earth's surface.
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 07:08 AM  5 years ago
Gearhead

rrMaster

Vt

MyPosts All Forum Topic
sO what about UFOs ????

Jim
Buzz Buzz Buzz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 06:55 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
I believe the word you are looking for is "parallel". And, even that's still not entirely true. A forward tilted rotor disk in forward flight with an accompanying nose down attitude of the fuselage is undesirable, hence the "upside down airfoil" back on the tail boom which helps keep the nose up and more "parallel" with the earth's surface.
The idea is to keep the mast (fixed to the airframe) perpendicular to the rotor disk.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-12-2014 08:49 PM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
The idea is to keep the mast (fixed to the airframe) perpendicular to the rotor disk.
Okay, but that's not what you said. The fuselage being perpendicular to the rotor disk would be a very, very bad thing. Mast bumping anyone?
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 09:00 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
OK AirWolfRC, just to set the record straight none of those are new or mysterious terms related to rotor systems. Teetered and Semi-Rigid are the same thing. The Bell 47/UH-1/AH-1 all have the teetered/semi-rigid design and the UH-60/CH-46/CH-47/CH53 all have fully articulated heads.
"semi-rigid" and "fully articulated" doesn't really clarify much unless you're already long in the business.

. . . and that's my point.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-12-2014 09:47 PM  5 years ago
HeimD

rrVeteran

the great southwest

MyPosts All Forum Topic
"semi-rigid" and "fully articulated" doesn't really clarify much unless you're already long in the business.
Brand new Navy helo flight students in HT-8 or HT-18 learn this difference in ground school on a daily basis.
SHARE  PM  EMAIL  Attn:RR  Quote
04-12-2014 10:08 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
When the people on this list start attending Navy helo flight school,
. . . I'll give you that argument.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-12-2014 10:34 PM  5 years ago
torque

rrKey Veteran

bolivia , north carolina

MyPosts All Forum Topic
I have a bunch of hours in a hiller 12c, (killer hiller) nice
machine, cyclic response is slow as opposed to hydraulic assisted.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 4 pages [ <<    <     1     ( 2 )     3      4     NEXT    >> ] 8483 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why real heli do not have flybar
 Print TOPIC  Make Suggestion 

 12  Topic Subscribe

Monday, September 23 - 9:56 am - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online