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-   -   AAC H135M replace Gazelles (https://www.pprune.org/rotorheads/644856-aac-h135m-replace-gazelles.html)

gipsymagpie 31st January 2022 22:07


Originally Posted by [email protected] (Post 11177615)
I would think the 135 TRDF procedure is similar to the As 365 with the advice to maintain higher speeds for the running landing to keep airflow over the fin to produce the anti-torque thrust required.

Not really, you just do an autorotation to an EOL (iaw PCL)

You could do a fast running landing, but with skids it would be a different ball game to the wheeled AS365. The sim suggests you could get away with it but I wouldn't want to try for real.

gipsymagpie 31st January 2022 22:11


Originally Posted by trim it out (Post 11177567)
The model we have doesn't have the end plates on the horizontal.

Thanks for the heads up on the TRDF, I'll have a dig into it if/when I return to 135 :cool:

They lopped off the end plates and the lower fin to make out of wind hovering require less extremes of pedal...great for hoisting in the mountains...not so good for suppressing Dutch roll in forward flight and the 90 kt limit on IAS mode IFR. You win some, you lose some.

And the solution is to add more fin...genius.

[email protected] 1st February 2022 05:48


Not really, you just do an autorotation to an EOL (iaw PCL)
That was an option on the 365 as well but again, although the sim thinks you can do it, you wouldn't want to try it for real.

A fast running landing on tarmac wouldn't be so bad, at least the friction would help directional control - it would be scary for sure but more controllable I think. Once you start the flare in an EOL with no TR you are in the lap of the Gods.

casper64 1st February 2022 06:36


Originally Posted by gipsymagpie (Post 11177959)
Not really, you just do an autorotation to an EOL (iaw PCL)

You could do a fast running landing, but with skids it would be a different ball game to the wheeled AS365. The sim suggests you could get away with it but I wouldn't want to try for real.

Heard an Eurocopter pilot did it on a Runway some 20 years ago without issues. Aircraft was not even damaged and is flying again. (Just needed some new skid shoes I guess :-) ) (Don’t know if he did an AR or running landing…)

Thud_and_Blunder 1st February 2022 12:33


You could do a fast running landing, but with skids it would be a different ball game to the wheeled AS365
Anyone else here remember the Met Police Bell 222 with TR problems that did a lovely high-speed running landing? All went well to touchdown (kudos), but I believe even differential braking couldn't keep it straight and it went off the runway/tipped over. Helis with high CofGs and relatively narrow wheel/skid track are going to experience significant roll moment as the aircraft yaws at speed on the ground. If the heli decelerates rapidly in a straight line before yaw starts to take effect the risk of the roll moment building is potentially reduced. I had a single engine problem in a 135T1 at night - carried out a running landing to a well-lit cargo apron instead of the runway proffered by ATC (dark desert surroundings, reduced height/depth perception). No yaw, hardly had to touch the pedals. With hindsight I was glad to have chosen the apron, as the surface wasn't finished to the same high standard as the runway so the friction (and resultant deceleration) was greater. The run-on was about 30m - a lot of noise and a shower of sparks behind the aircraft which was distracting, but the only things that needed replacing were the skid shoes. I was unfortunate enough later that year when training with a student to do a run-on to the main runway which resulted in more damage: after touchdown, the aircraft slid for over 100m even with the lever down, and I failed to stop the aircraft from yawing over the centreline lights. They might only be approx 2cm above the surface, with chamfered edges, but that was still enough to snap the right rear skid post. Moral to these tales - if you have to do a run-on landing in an aircraft with skids, use a taxiway or apron for preference and - if you have to use a runway - stay away from the centreline. I wouldn't use grass unless it was a patch I knew well (Middle Wallop or Tern Hill, for example) and had faith in the grounds-maintenance folk to keep it flat.


Once you start the flare in an EOL with no TR you are in the lap of the Gods
Absolutely right - teaching the exercise in the sim, we stressed the need to tighten the flare slightly more than for a 'normal' EOL to kill off all forward speed, then concentrate on getting the floor absolutely level for touchdown. Glad I'll never have to be the person who has to try it for real - retirement is a wonderful thing :ok:

MightyGem 1st February 2022 20:34


Heard an Eurocopter pilot did it on a Runway some 20 years ago without issues. Aircraft was not even damaged and is flying again. (Just needed some new skid shoes I guess :-)
As did the Merseyside Police Twin Squirrel in 1993. Very poor quality video, but the stationary tail rotor can clearly be seen.


Thud_and_Blunder 1st February 2022 21:27

Did NOT know about that one, Gem - what a lovely bit of flying!

[email protected] 2nd February 2022 08:10

Textbook stuff and a great outcome - Kudos:ok:

melmothtw 2nd February 2022 09:56

Whatever the truth of the H135 vs H145 debate for training at DHFS, the MoD has just ordered another five of the former. Now at 34 H135s and 7 H145s, all in.

[email protected] 2nd February 2022 16:25

Are they looking to take on other defence-related training I wonder? Other nations military's have often wanted UK Mil level training.

diginagain 2nd February 2022 16:56


Originally Posted by MightyGem (Post 11178490)
As did the Merseyside Police Twin Squirrel in 1993. Very poor quality video, but the stationary tail rotor can clearly be seen.

https://www.youtube.com/watch?v=z3oVw6_0MEU

Chap did well.

handysnaks 2nd February 2022 20:38

JC, if I remember correctly. Top work by a top pilot.

gipsymagpie 2nd February 2022 22:29


Originally Posted by melmothtw (Post 11178725)
Whatever the truth of the H135 vs H145 debate for training at DHFS, the MoD has just ordered another five of the former. Now at 34 H135s and 7 H145s, all in.

Are not those the extras to replace Gazelle as per the original post? Not for Shawbs surely

FloaterNorthWest 3rd February 2022 08:49


Originally Posted by gipsymagpie (Post 11178999)
Are not those the extras to replace Gazelle as per the original post? Not for Shawbs surely

Not for Shawbury. Shawbury are Juno HT Mk 1 and these will be Juno AH Mk 1.

gipsymagpie 3rd February 2022 09:49

AH Mk2 is more likely as the mark number changes no matter what the letters are. Think Gazelle AH1, HT2, HT3, CC4

melmothtw 3rd February 2022 10:30

I don't see five helicopters being for a Gazelle replacement.

diginagain 3rd February 2022 10:37


Originally Posted by handysnaks (Post 11178961)
JC, if I remember correctly. Top work by a top pilot.

Apart from the bit that instigated the need for an EOL...

handysnaks 3rd February 2022 11:08

Cowling issue (I think).

[email protected] 3rd February 2022 17:03


I don't see five helicopters being for a Gazelle replacement.
pretty much what they need for 5 Regt AAC.

MightyGem 3rd February 2022 20:22


Originally Posted by handysnaks (Post 11178961)
JC, if I remember correctly. Top work by a top pilot.


Cowling issue (I think).
Yes to both.


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