Thanks Nick, it now starts to make sense, with the formula for stored energy and 212 man's explanation. Wouldn't it be nice if the manufacturer's put a little bit of background information in the systems description of the aircraft flight manual?

I congratulate all those who have responded to this subject. Your inputs are informative and constructive and it would surely benefit the readers of the manuals if the explanation were provided of the particular system, but in a stand alone annex, not in the main text. The main text needs to be precise and to the point and not painted with extra explanations as is the system at the present time.
Thank you all.

EC145 Tail Rotor RPM
 

Anyone know the tail rotor RPM of the EC145 ... or at least the ratio of the main to tail rotor? I've been trolling the web, manuals, etc and can't find anything that indicates this. Thanks for your help!

Tompkins

I think it is 2169 RPM.

As I understand it , the ratio is usually 6-1.

That is 6 rotations of the tail rotor for every 1 rotation of the main rotor, but I am not sure if that is the case for all helo's.

For the Notars.....erm ????? :confused:


Does anyone know of any helos where this is not the case... 6-1 rule?

HF

HELOFAN,
There really is no rule about ratios of rpm, but many times the tail rotor tip speed is the same as the main rotor (when a conventional open tail rotor is used), so the ratio of the rpm is often the ratio of the diameters of the two rotors. Many rotors use a tip speed between 700 and 725 feet per second. For the EC-145 that turns out to be a 6.5 to 1 rpm ratio.

Thanks Nick.

I should say that the word "rule" was a term I was using loosly and should have said average is around.

Do you know where the ration of about 6-1 isnt correct?
I was thinking for multi tail rotor helo's such as the Apache or possibly the larger or smaller helo's come into play.
I would think it should not matter but I had to ask.

Thanks again.

HF

EC145
 

Morning all,
Anyone with first or second hand reports on the commercial machines already in service?

How about deliveries, completions, support?

Thanks

EC145 - anyone?
 

Hi all,

it seems the used-market for the EC145 is bone-dry.
I am looking for a EC145 ASAP, pref. in Utility config. but will consider any machine as long as special equipment does not make the deal economically un-acceptable....

Please send me a Private Message....

Cheers,

3top :cool:

Forget it... or pay much more than new. There are only a few in private hand. The others are government property.

EC145
 

We have different forums on the B412, AW139, EC135 etc etc.

What if we have a forum regarding the EC145 and the inputs from those who operate it.

800

I think thats a fine idea. It's a good aircraft but it does have it's particular challenges.

Max

Well how about that we already have a EC145 thread...guess we just need to get it back to the top!

Svenestron, the Apache has a stacked tail rotor. It is basically two two bladed systems stacked with about 6 inches or so in between for noise reasons. If you have ever heard one nearby you would agree it works!

Max

H-5, H-21, CH-46 and CH-47 are all 1:1 ratio.:E

Svenestron,

Yes I believe it is to reduce the interaction between the tip vorticies but it has been a looooong time since I went to school on that machine so I wouldn't swear it to be true. I can say that the sound is much lower frequency and amounts to a low hum, much quieter than the unit on the blackhawk which is about the same size aircraft. Not only are they space apart axially but they have an odd phase angle separation (the blades are not all 90 degrees apart). This may have as much to do with the low noise as anything else.

I'll be interested to see if the B model EC145, whenever it comes, will have the fenestron tail on it. I don't think the machine has much of an issue with tr performance as it is so any change to the fenestron would most likely be for noise reasons only.

Max

standby horizon?
 

Hello,

Just woundering, across the fleet, if operators are having problems with the "Standby Horizon".

800

Its been a while but....

Is it warm in Oz this time of year?

Has it seized?

Didn't they tell you about that on the Course?

its always warm in the west.

It's just that it does not always tell the same story as the ADI's.

EC 145 Cerification Limits
 

Can somebody settle an argument for me and confirm that the EC145 is certified to +45 degrees C. Thanks

G. :)