Notar -v - Tail Rotor
Join Date: Dec 2001
Location: Big Sky Country
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350B2 vs 500F
I would love to read a discussion comparing the 350B2 and the 500F. You mentioned high/hot conditions requiring more than the 500E, wondering why your unit didn't go with the 500F.
Thanks
Nucleus
Notar Fan, from what I am seeing in your writing, you have no real flight time in a NOTAR. You are saying all this wonderful stuff that is straight from the PR department at MD.
MD600, has the right to comment about the 600 as he ownes and flys one. While I do not always agree with his opinions, I respect them due to this. NL is very well respected for his knowledge on helicopters and the mechanics of them. Plus he has the experiance to back it up. I while I do not like the NOTAR and my regular bird is the 500E (soon to be a 350B2) due to the altitude/heat I operate in, I have 1,000+ hours in the NOTAR.
Our NOTARs spend more time in the hangar, and have more maint. You need to talk to some mechanics about the fan and the trouble with them.
NL the YSAS is not a required item on the 520/600, although it is helpful. It is turned off a lot if we are doing a lot of manuvering due to us having to fight the gyro.
Thanks
Nucleus
Notar Fan, from what I am seeing in your writing, you have no real flight time in a NOTAR. You are saying all this wonderful stuff that is straight from the PR department at MD.
MD600, has the right to comment about the 600 as he ownes and flys one. While I do not always agree with his opinions, I respect them due to this. NL is very well respected for his knowledge on helicopters and the mechanics of them. Plus he has the experiance to back it up. I while I do not like the NOTAR and my regular bird is the 500E (soon to be a 350B2) due to the altitude/heat I operate in, I have 1,000+ hours in the NOTAR.
Our NOTARs spend more time in the hangar, and have more maint. You need to talk to some mechanics about the fan and the trouble with them.
NL the YSAS is not a required item on the 520/600, although it is helpful. It is turned off a lot if we are doing a lot of manuvering due to us having to fight the gyro.
Join Date: Apr 2001
Location: SoCal
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The reason that we did not go with the 530F is size. We have outgrown the 500 series and needed something bigger. We are now carrying T.V. downlink equipment in some of the ships, and needed a bird that could carry that and still perform search and rescue ops in the mountains.
We also wanted to get back to having only one model on the line that could do what we needed for all of our missions.
We also wanted to get back to having only one model on the line that could do what we needed for all of our missions.
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Join Date: Apr 2002
Location: UK
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Thanks to all of you that have replied to my inquiry.
I now get the picture that there are some very good reasons for the NOTAR and they seem to be
a. safety for persons around when rotors are turning,
b. quietness
c. new technology
The downsides are
a. poor performance in hover/high weight/altitude
b. possible extra maintenance costs
c. acceptance of new technology
Once I have some feet on type I will make a report to my findings.
I now get the picture that there are some very good reasons for the NOTAR and they seem to be
a. safety for persons around when rotors are turning,
b. quietness
c. new technology
The downsides are
a. poor performance in hover/high weight/altitude
b. possible extra maintenance costs
c. acceptance of new technology
Once I have some feet on type I will make a report to my findings.
Thread Starter
Join Date: Apr 2002
Location: UK
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One question comes to mind on the NOTAR v Tail rotor.
With a normal tail rotor and the Fenestron there is the possibility to get into VRS(tail rotor breakaway) Is this event possible with the NOTAR? I understand that VRS is limited to a rotor system, however, there maybe something similar which could happen with the NOTAR. Or is this accounted for in the critical azimuth?
With a normal tail rotor and the Fenestron there is the possibility to get into VRS(tail rotor breakaway) Is this event possible with the NOTAR? I understand that VRS is limited to a rotor system, however, there maybe something similar which could happen with the NOTAR. Or is this accounted for in the critical azimuth?
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I think you are talking about loss of tail rotor effectiveness LTE ( or fenestron stall ) not Vortex ring state . AFAIK VRS is only normally talked about in relation to the main rotor. To get VRS in a tail rotor you would be moving the rotor through its own wake and as such would it not be a self correcting phenomena ( get into wake lose thrust rotate out of wake regain thrust ) ? There have been many discussions on here in the past about LTE and Fenestron stall from people much wiser than me.
Join Date: Apr 2001
Location: SoCal
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Although I am not sure about the "VRS", it does suffer from "LTE" as any helicopter. It has the same "authority" as a tail rotor version, so in essance it reacts the same. It also, due to the tail as big as it is, loves to weather vane more then the tail rotor.
