Yacht Helicopters

K1W1 · 10-28-2006, 03:49 AM

Hi,

To remove any doubt , the pictures I posted are my own taken by me whilst working on the boat.

The First Picture was taken in Thailand when I was having a ride in the machine

The Middle Picture was taken in Traceys Arm, Alaska

The Last Picture was taken in Smiths Creek at NQEA in Cairns Australia

Sea Sedan (now called Huntress) was a De Vries Feadship, the Helicopter was an MD 600.

wdrzal · 10-28-2006, 08:27 AM

Quote:

Originally Posted by yachtluver

i Just found something on it. This is really amazing technology and i did not know about it untill you all mentioned it just now...http://en.wikipedia.org/wiki/NOTAR
So it uses vectored thrust for direction similar to how an F-22 uses this to obtian great pitch control.
More on it here...http://www.aviationtoday.com/cgi/rw/...=0703notar.htm

Its good that we learn stuff everyday.

If you look close you will see a rectangle port on the end of the round tail boom,yaw is accomplished by the amount of bypass air allowed to exhaust there from the turbine.

There is also a Russian design,can't remember model that had no tail rotor and no vectored thrust. It simply had twin counter rotating main blades,one stacked above the other.Each rotating in a opposite direction ,canceled out the yaw torque. And of course are troop carriers that have one main rotor in the front and one in the rear also use no tail rotor.

YachtForum · 10-28-2006, 08:44 AM

Quote:

Originally Posted by wdrzal

If you look close you will see a rectangle port on the end of the round tail boom,yaw is accomplished by the amount of bypass air allowed to exhaust there from the turbine.

Whoops, hold on a minute! The boom isn't pressurized by the exhaust. There's a seperate fan driven by the engine that draws air in from the top of the boom, near the fuselage. Also, the majority of torque compensation is derived from the Coanda effect of the boom's design, not from vectored thrust.

YachtNews · 10-28-2006, 08:48 AM

Yes i know the both you are talking about. The latter is Called the Chinook military transport.

K1W1 · 10-28-2006, 09:42 AM

Hi,

Wdrzal- Is this the machine you were thinking of?

http://en.wikipedia.org/wiki/Coaxial_rotor

http://en.wikipedia.org/wiki/Image:Ka50.heli.750pix.jpg

YachtForum · 10-28-2006, 11:09 AM

More threads for rotorheads...

General Heli Discussion…
http://www.yachtforums.com/forums/ge...ht=helicopters

Heli’s on smaller yachts…
http://www.yachtforums.com/forums/showthread.php?t=3447

Heli approach and storage on Ilona …
http://www.yachtforums.com/forums/showthread.php?t=3558

Heli approach & landing on Evvivia…
http://www.yachtforums.com/forums/showthread.php?t=3339

Sailboats & Heli’s? Yes! Tiara…
http://www.yachtforums.com/forums/ge...ht=helicopters

YachtNews · 10-28-2006, 01:01 PM

Tiara is amazing in that respect...she is the only helicopter carrying MegaSloop that i know of. The crew must have a hard time removing the backstays all the time when the heli has to land. Is that Tiara's heli though or just a visiting heli?

wdrzal · 10-28-2006, 11:40 PM

Quote:

Originally Posted by CCamper

Whoops, hold on a minute! The boom isn't pressurized by the exhaust. There's a seperate fan driven by the engine that draws air in from the top of the boom, near the fuselage. Also, the majority of torque compensation is derived from the Coanda effect of the boom's design, not from vectored thrust.

I said bypass air from the turbine was exhausted at the rectangular port,

not implying the exhaust was blown down the tail boom,it much to hot and the velocity is much to high.

I did not extrapolate where the bypass air came from,other than the turbine which is true.

While the "coanda effect" adds yaw stability,it's Built into the aircraft for longitudinal stability in flight and the pilot has no control,or lets say very little over this effect. the more air moving down over the tail boom the greater the effect.So the more power applied to the main rotor, the greater the effect. Most pilot controlled yaw is accomplished by a drum that rotates in the tail boom limiting or increasing the the bypass air.

Carl explained where it comes from so no need to repeat.

I think since I said bypass air was exhausted, Carl took I meant turbine exhaust, which passes Thur the main compressors and hot section.

I'm sure Carl has more experience than I, but technically what I said was correct.
If not ,Carls welcome to make additional corrections.

YachtNews · 10-29-2006, 06:03 PM

Does anyone know what kind of Heli will Amevi recieve?..In the rendering it looked like an S-76....or EC-155? or something of similar size.

AMG · 10-30-2006, 09:33 AM

Here are a couple of distant shots of Calixe with her heli and Annaliesse or Alysia with a similar type. Calixe used to have a MD 500 but these looks more like Eurocopters.

YachtNews · 10-30-2006, 10:07 AM

Lars, that looks to be Annaliesse in the picture....Alysia has a more rounded looking forward steaming mast....That is the first time i have seen a pic with a heli aboard...I know they have pads but they crew usually have loungers on the pad and not a heli.

Talon · 11-01-2006, 02:32 PM

Nomar Notar (No Main Rotor - No Tail Rotor!)
Also called an aeroplane.

Anyone know of SeaWinds amphibious aircraft being used as shuttle craft, instead of a Heli?
I Know of 1, but cannot fully recall the name of Yacht "Big ****".

Talon

Neil Rooney · 11-01-2006, 06:56 PM

Nadine had a Seawind with a turbine, before she sank. The Seawind was not on board when she sank but the crew had to ditch their Jet Ranger.

K1W1 · 11-01-2006, 11:59 PM

Hi,

Nadine may have very briefly been known as Big Eagle in late 1991 the late Mr Bernie Little had it and it underwent a big mechanical refit replacing the Detroits with Cats amongst other things in the old Miami River Drydocks.

Talon · 11-02-2006, 02:45 PM

Cheers Guys,

Big & Little Eagle / Nadine, they have been in many films WITH a Seawind onboard.
Wait for the next Mega Yacht to have a V22 Osprey (Twin Tilt Rotor!) land on deck!

Jay - Talon.