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Search: Posts Made By: Lu Zuckerman
Showing results 1 to 35 of 36
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Forum: Rotorheads
30th Nov 2003, 05:36
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Thumbs up Dislocating the main transmission.

In my post above about ditching the HOS-1s I do not believe they experienced a transmission breaking loose. On that helicopter type the blades had a main tubular spar and ribs and were covered in...
Forum: Rotorheads
29th Nov 2003, 23:15
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Thumbs up If only they kept records.

Back in 1949 the US Coast Guard ran a test to determine the best way to autorotate into the water. They used surplus HOS-1s. I saw several of the landings and ditchings and I believe there were a...
Forum: Rotorheads
3rd Dec 2002, 23:00
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question That was only the beginning.

To: bigdog 1971



Several years later that same pilot was promoted to Captain and was the Skipper of the Coast Guard Air Station in San Diego. The US Navy had commissioned several PBM-5As and...
Forum: Rotorheads
3rd Dec 2002, 13:05
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question Autorotation and ditching.

I do not know if any records were kept or if they were if they still exist but in the summer of 1949 the US Coast Guard ran a series of autorotation and ditching of a large number of Sikorsky HOS-1s....
Forum: Rotorheads
9th Apr 2002, 02:10
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Dipping the tail rotor in the water would slow...

Dipping the tail rotor in the water would slow the main rotor down for a mili second at which time the tail rotor and gearbox would be torn away from the tail cone and the drive shaft would suffer a...
Forum: Rotorheads
8th Apr 2002, 18:19
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Back in 1949 the US Coast Guard attempted to...

Back in 1949 the US Coast Guard attempted to determine the best method of ditching a helicopter. Having access to twelve surplus HOS-1 helicopters the pilot took them up in succession and dumped...
Forum: Rotorheads
27th Nov 2001, 19:20
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Sling Load The situation that you...

To: Sling Load

The situation that you describe is purely hypothetical however you do acknowledge that there would be increased forces that would damage the blades or, to totally destroy them. If...
Forum: Rotorheads
27th Nov 2001, 04:40
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Voljet and everyone else. I stand...

To: Voljet and everyone else.

I stand corrected. I got it twisted around. The FAA Rotorcraft Flying Handbook Page 11-6 states: At the onset of retreating blade stall the helicopter will...
Forum: Rotorheads
27th Nov 2001, 03:03
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Hoverman “What about Grey Area's more...

To: Hoverman

“What about Grey Area's more important point?
Professional pilots/instructors are able to make their own assessments of the value or otherwise of your theories, but the site also has...
Forum: Rotorheads
27th Nov 2001, 01:24
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Grey Area You missed the point of the...

To: Grey Area

You missed the point of the comparison. In order to accept my reasoning you have to accept the theory of gyroscopic precession. If you can’t accept that, then substitute...
Forum: Rotorheads
24th Nov 2001, 19:47
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Post To: Sling Load “I wouldn't say the disc...

To: Sling Load

“I wouldn't say the disc drops due to gyroscopic precession, there is a difference in lift between the retreating stalling blade and the still advancing blade, which at high speeds...
Forum: Rotorheads
23rd Nov 2001, 22:22
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Post To: Grey Area It would be sneaky of me to...

To: Grey Area

It would be sneaky of me to say that if Sling Load indicated that we were in a vacuum situation that I would assume a frictionless environment but I didn’t think of that. Based on...
Forum: Rotorheads
23rd Nov 2001, 20:37
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Sling Load Most likely nothing. There...

To: Sling Load

Most likely nothing. There would be no response to collective input nor, would there be any response to cyclic input. Whether you believe in aerodynamic precession or, gyroscopic...
Forum: Rotorheads
23rd Nov 2001, 02:55
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Everyone else but Nick because he won’t...

To: Everyone else but Nick because he won’t answer

Nick sez:

“Before all the mechanics jump up and describe (accurately) that their helicopter is rigged exactly at 90 degrees (forward stick...
Forum: Rotorheads
22nd Nov 2001, 04:57
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson >"Some individuals will...

To: Dave Jackson

>"Some individuals will look at this as a pure aerodynamic function...... I will totally believe that theory if someone can convince me "<

This is what I said:

Some...
Forum: Rotorheads
22nd Nov 2001, 03:19
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson It is very easy to prove...

To: Dave Jackson

It is very easy to prove aerodynamic precession by using a Bell analogy indicating that in 180-degrees of rotation the rotor has aligned itself with the swash plate. Now, try to...
Forum: Rotorheads
21st Nov 2001, 23:39
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Tgrendl “On a bell head asking whether...

To: Tgrendl

“On a bell head asking whether it's a predominantly gyroscopic effect or an aerodynamic one would simply require spinning the aircraft up sans blades. Do the control inputs still have...
Forum: Rotorheads
21st Nov 2001, 08:26
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson “I'm happy to drop the term...

To: Dave Jackson

“I'm happy to drop the term 'gyroscopic'. It is a good one for holding a spinning bicycle wheel in your hand and saying "Wow". It is also a valid analogy for describing a basic...
Forum: Rotorheads
21st Nov 2001, 03:05
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson “The swashplate and also...

To: Dave Jackson

“The swashplate and also the basic Bell, 2-blade, teetering (normal to span) rotor exhibit exactly the same characteristic as a gyroscope. I.e. 90-phase offset”.

“All...
Forum: Rotorheads
20th Nov 2001, 08:00
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson Not being a graduate...

To: Dave Jackson

Not being a graduate engineer I find it difficult to follow Nicks' example. Did he or did he not say that when the force was applied to the upper portion of the spinning wheel...
Forum: Rotorheads
20th Nov 2001, 01:21
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Dave Jackson As much as you and many...

To: Dave Jackson

As much as you and many others insist that gyroscopic precession has nothing to do with helicopter rotors I would suggest that you contact the training departments of Sikorsky,...
Forum: Rotorheads
19th Nov 2001, 07:20
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: 3top I can understand the problem you...

To: 3top

I can understand the problem you outlined. We never had it. Even though the springs were removed we never had a problem with the shoes sticking to the clutch drum. It might be that...
Forum: Rotorheads
19th Nov 2001, 00:45
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Bladestrike “Any of you learned fellows...

To: Bladestrike

“Any of you learned fellows know at which RPM gyroscopic procession starts to become an issue? I'm thinking about blade sailing on startup/shutdown and where the moment applied by...
Forum: Rotorheads
17th Nov 2001, 07:06
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Nick Lappos OK, but before you withdraw...

To: Nick Lappos

OK, but before you withdraw yourself from my "inane" comments please answer my post on Weather and other nasty stuff.
Forum: Rotorheads
17th Nov 2001, 01:46
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question A point to ponder: Let’s talk about...

A point to ponder:

Let’s talk about everybody’s Favorite subject GYROSCOPIC PRECESSION. If you have a gyroscope with three degrees of freedom and you move or rotate the entire gyroscope the rotor...
Forum: Rotorheads
17th Nov 2001, 01:20
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question Jiff: Using your example there will be...

Jiff:

Using your example there will be minimal pitch change at low collective because the pitch horn/pitch link connect point is on or near the teeter axis. If the collective is raised and you...
Forum: Rotorheads
16th Nov 2001, 20:12
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Nick Lappos “A cure is to ask the ship...

To: Nick Lappos

“A cure is to ask the ship to turn into the wind, so the roll angle is not aligned with the crosswind, but pilots are reluctant to impose on the ship operations (unless they are in...
Forum: Rotorheads
15th Nov 2001, 02:40
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Nick Lappos “The rolling deck has...

To: Nick Lappos

“The rolling deck has motions that are small potatoes compared to the rates needed to create big rotor forces, and the swash plate does not get driven by the rotor, only an...
Forum: Rotorheads
14th Nov 2001, 21:03
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: heedm What you say may be true but you...

To: heedm

What you say may be true but you have taken a snapshot in time. The helicopter does not just roll in one direction. As the trough of the wave passes the helicopter will roll in the...
Forum: Rotorheads
14th Nov 2001, 00:51
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: sling load True, I do not have an...

To: sling load

True, I do not have an engineering degree. I majored in Industrial Design with a minor in general science. I did take several courses that were a part of the Engineering...
Forum: Rotorheads
13th Nov 2001, 05:55
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question The following was extracted from the article...

The following was extracted from the article about the rollover of the Super Puma in the North Sea.

The passages are not in the order of their occurrence in the article. I changed their order for...
Forum: Rotorheads
12th Nov 2001, 00:25
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Heliport “You are right to challenge...

To: Heliport

“You are right to challenge flawed theories, and to correct misleading information.
Forums inevitably attract a wide variety of people, and there is nothing to prevent anyone...
Forum: Rotorheads
10th Nov 2001, 21:33
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Nick Lappos “You wax on so much you get...

To: Nick Lappos

“You wax on so much you get all muddied. The entire point of your first post was about how much you knew about the (mythological) precession and how it made water operations a bad...
Forum: Rotorheads
10th Nov 2001, 08:44
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question To: Nick Lappos “I hate to yet again be the...

To: Nick Lappos

“I hate to yet again be the gadfly to put pins in Lu's credibility, but on water operations in helicopters is very normal, very natural and very safe. Rotor starts, takeoffs and...
Forum: Rotorheads
10th Nov 2001, 01:48
Replies: 267
Views: 46,952
Posted By Lu Zuckerman

Question Here is some more useless or extraneous...

Here is some more useless or extraneous information regarding ditching. In 1949 when I was attending aircraft mechanics school in Elizabeth City, NC the Coast Guard was developing a standardized...
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