Helicopter News & Discussion

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Member for

9 years 9 months

Posts: 8,850

I couldn't download the video, but it clearly shows 4 Apaches !,
They're UAEAF

Member for

8 years

Posts: 5,852

Those numbers seem incredible. I also question that payload capacity could be increased by 50% without implications for the airframe.

No. The early CH47 had a Naca 4 digit sym airfoil (0012) like many rotorcraft. Commonality, pattern of employment and simplification in growth (huge increase in payload - I think it's the F model that could lift its A ancestor) have led to only minor modification of the rotor blade sections like in many other helicopters.

Please find below an illustration of CL comparison with a more modern airfoil from Boeing Vertol with the same characteristics (thickness 12%):

http://srdfmc.free.fr/images/machNbrLift_Blade2.jpg

http://srdfmc.free.fr/images/NACA3312 - Simulacre RV-7.jpg

As you can see, there are some huge difference that makes for the increase of lift, hence a net payload advantage.

Member for

8 years

Posts: 5,852

Slight Turbulences expected for the Airbus Helicopters H225M deal with Poland

[The News Magazine] Wprost says that four months on from the selection of the H225M in April for the tri-service deal, the contract is no closer to being finalised – particularly around industrial offsets.

With national elections due in the autumn, it suggests that officials from both the defence and economic affairs ministries are anxious to leave any decision to the next government.
[...]
lack of a folding tail boom, issues with the infrared target designator and the speed with which the cabin can be reconfigured.
[...]
Airbus Helicopters has promised to deliver the required specification – including items like the folding tail boom for the 14-15 examples destined for the Polish navy.
[...]
Previous reports suggested the acquisition was worth up to Zl13 billion ($3.5 billion), but Tomaszewski says the final figure will not be known until it concludes negotiations covering the provision of “a training package, simulator, and the construction of a logistics centre”.

Source
Flightglobal.com