Tail Rotors
Joined: Nov 2001
Posts: 58
Likes: 0
From: NSW, Australia
Speedy,
NR is correct on the Storch. The link for the Storch site is:
http://www.nor.com.au/business/storch/
The current issue of Australian Flying magazine ( which has a rotor section and has an article on mountain flying in helos) reports that the Qantas (or former Ansett, I can't remember) captain who holds a number of records for a round the world flight he did in a Lancair iV he built has sold the Lancair and is currently building a Storch. Talk about opposites!
NR,
Thanks for the info.
NR is correct on the Storch. The link for the Storch site is:
http://www.nor.com.au/business/storch/
The current issue of Australian Flying magazine ( which has a rotor section and has an article on mountain flying in helos) reports that the Qantas (or former Ansett, I can't remember) captain who holds a number of records for a round the world flight he did in a Lancair iV he built has sold the Lancair and is currently building a Storch. Talk about opposites!
NR,
Thanks for the info.
Guest
Posts: n/a
Brian G,
I did a study about 4 years ago, and found that fully 95% of all "LTE" incidents in two different data bases happened to Bell helicopters, and 90% were Bell 206's. I usually raise irate posts from loyal Bell guys, but the data speaks for itself (and with over 1500 hours in Bells, 1000 in combat, I refuse to be labeled an anti-Bell guy).
It is my ernest belief that an adequate tail rotor cannot be forced into "LTE" in any normal flight conditions. The whole idea of LTE masks the true cause - weak tail rotors- and makes it seem that all single rotor helos can suddenly get consumed with the LTE disease and start spinning.
What consumes tail rotor anti-torque capability and makes LTE occur is when main torque is raised too high during otherwise marginal maneuvers. For example, this is when you terminate an approach and raise the collective too high.
Most helos are tested in level, sideward flight to higher and higher speeds, until the tail rotor hits its pedal stops. I believe a more effective way to judge adequacy is to trim to a sideward speed and then command some transient torque increase (a brief collective pitch rise) to see if adequate margin exists.
I did a study about 4 years ago, and found that fully 95% of all "LTE" incidents in two different data bases happened to Bell helicopters, and 90% were Bell 206's. I usually raise irate posts from loyal Bell guys, but the data speaks for itself (and with over 1500 hours in Bells, 1000 in combat, I refuse to be labeled an anti-Bell guy).
It is my ernest belief that an adequate tail rotor cannot be forced into "LTE" in any normal flight conditions. The whole idea of LTE masks the true cause - weak tail rotors- and makes it seem that all single rotor helos can suddenly get consumed with the LTE disease and start spinning.
What consumes tail rotor anti-torque capability and makes LTE occur is when main torque is raised too high during otherwise marginal maneuvers. For example, this is when you terminate an approach and raise the collective too high.
Most helos are tested in level, sideward flight to higher and higher speeds, until the tail rotor hits its pedal stops. I believe a more effective way to judge adequacy is to trim to a sideward speed and then command some transient torque increase (a brief collective pitch rise) to see if adequate margin exists.
Scalextric for Men
Joined: Jul 2001
Posts: 277
Likes: 0
From: Southern England outside the M25
"Remember. you don't need a tail rotor, try an MD 902, the aircraft that uses a kazoo for anti torque control."
SO HERE IS MY SILLY QUESTION, THAT SHOULD AMUSE THE PPRUNER'S
Does a German ADAC Explorer kazoo Beethoven
A U/S Coastguard Explorer kazoo 'The stars and Stripes'
Ecetera Ecetera
And if they; the Explorers: do perform music accordding to the country of operation and residence.
Does this mean the Mesa boys&girls make the most musical helicopter?
Answers to [email protected][/email]:
SO HERE IS MY SILLY QUESTION, THAT SHOULD AMUSE THE PPRUNER'S
Does a German ADAC Explorer kazoo Beethoven
A U/S Coastguard Explorer kazoo 'The stars and Stripes'
Ecetera Ecetera
And if they; the Explorers: do perform music accordding to the country of operation and residence.
Does this mean the Mesa boys&girls make the most musical helicopter?
Answers to [email protected][/email]:
Last edited by Capn Notarious; 27th October 2002 at 14:52.
Joined: Feb 2002
Posts: 364
Likes: 0
From: Just over there....no there.
MD902 a Kazoo? I thought it was a hair dryer!
You don't really need a main rotor either, look at Mr.Kaman, he put two tail rotors on top and bob's your uncle!
Nick: Your'e right about 206 tail rotors, very weak, especially on the L's
You don't really need a main rotor either, look at Mr.Kaman, he put two tail rotors on top and bob's your uncle!
Nick: Your'e right about 206 tail rotors, very weak, especially on the L's
Joined: Nov 2000
Posts: 480
Likes: 0
From: Scandiland
tailrotors
Hi all!
Something on the "Blackhawk" just caught my interest:
Why is the tailrotor ofset from vertical (so that the slipstream is pointed slightly downward)?
I'm only guessing here, but is it to lift the tail because of CG being aft of the main rotor shaft? Does this make things more complicated when you fly regarding alterations in rotor speed or power?
regards/lns
Something on the "Blackhawk" just caught my interest:
Why is the tailrotor ofset from vertical (so that the slipstream is pointed slightly downward)?
I'm only guessing here, but is it to lift the tail because of CG being aft of the main rotor shaft? Does this make things more complicated when you fly regarding alterations in rotor speed or power?
regards/lns
