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Search: Posts Made By: NickLappos
Showing results 1 to 35 of 101
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Forum: Rotorheads
28th Jul 2018, 18:11
Replies: 1,327
Views: 374,687
Posted By NickLappos

That is one way to describe it donut king (love...

That is one way to describe it donut king (love the name!), but it is easiest to see it as the fact that with higher tip speed at higher Nr, the retreating tips are quite a bit less stalled (yes,...
Forum: Rotorheads
18th Jul 2018, 04:02
Replies: 1,327
Views: 374,687
Posted By NickLappos

76 RPM

The original S76A had an rpm range in powered flight from 96% to 107%. This allow the pilot to select the RPM based on flight condition and the optimal performance. Some information was provided to...
Forum: Rotorheads
18th Aug 2017, 21:25
Replies: 1,327
Views: 374,687
Posted By NickLappos

TIMTS That doesn't have a grain of truth to it!...

TIMTS
That doesn't have a grain of truth to it! The Vne is a complex limit, because once it is established, then many calculations about dynamic system life are made from the flight loads at Vne...
Forum: Rotorheads
2nd Jun 2017, 18:45
Replies: 1,327
Views: 374,687
Posted By NickLappos

riff_raff is right, there is a minimum fuel flow...

riff_raff is right, there is a minimum fuel flow for an engine that dictates how quickly it can slow down in normal circumstances. This min fuel flow is what we see when we drop collective rapidly,...
Forum: Rotorheads
28th May 2017, 20:33
Replies: 1,327
Views: 374,687
Posted By NickLappos

Aircraft lore is made of these kind of questions!...

Aircraft lore is made of these kind of questions!
For all S-76 models:
1) The tail rotor is driven by the main bull gear, and thus by either engine.
2) It is not possible to isolate the TR drive...
Forum: Rotorheads
29th May 2011, 18:01
Replies: 1,327
Views: 374,687
Posted By NickLappos

The behavior is quite consistent: Under...

The behavior is quite consistent:

Under normal circumstances, up collective adds left pedal (increases TR pitch) automatically, and the pedals don't move at all. This mixing is done in the...
Forum: Rotorheads
15th Feb 2011, 21:47
Replies: 1,327
Views: 374,687
Posted By NickLappos

HeliTester, I have to admit I haven't thought...

HeliTester,
I have to admit I haven't thought this much about it in about 31 years (the procedure was developed about 1980).
I believe your last explanation is correct, I don't have a copy of the...
Forum: Rotorheads
10th Feb 2011, 02:43
Replies: 1,327
Views: 374,687
Posted By NickLappos

Yes, good catch, I really didn't answer his...

Yes, good catch, I really didn't answer his question! The current (rolling average) margin cannot have degraded from the original (rolling 's average) margin by more that the original 30 min power...
Forum: Rotorheads
9th Feb 2011, 23:18
Replies: 1,327
Views: 374,687
Posted By NickLappos

jibboo, You came to the right place, I wrote...

jibboo,
You came to the right place, I wrote that gibberish, or at least was principal author, but by the time the tech pub writers finished.......
The basic idea of Power Assurance is to be sure...
Forum: Rotorheads
27th Sep 2009, 19:34
Replies: 1,327
Views: 374,687
Posted By NickLappos

Regarding the rotor brake, it is both common and...

Regarding the rotor brake, it is both common and allowed to have the brake on efore starting one or both engines, then release the brake after the engines stabilize at idle. In high winds, it is...
Forum: Rotorheads
29th Aug 2009, 15:08
Replies: 1,327
Views: 374,687
Posted By NickLappos

Brian, Good question. The engine limits are...

Brian,

Good question. The engine limits are specified in the flight manual and are required markings, so the typical red lines must appear, in any piloting situation, per FAR. There is no...
Forum: Rotorheads
29th Aug 2009, 05:06
Replies: 1,327
Views: 374,687
Posted By NickLappos

Low Time, I think Brian and bb in ca and the...

Low Time,
I think Brian and bb in ca and the others have it right. A slight loss of prime will make the engine delay a bit on start. I would think you can hold the starter a bit longer than 6...
Forum: Rotorheads
14th Jul 2009, 23:10
Replies: 1,327
Views: 374,687
Posted By NickLappos

to pcpahari_IAF, No problem, this is complex...

to pcpahari_IAF,

No problem, this is complex stuff, keep plugging away!

Basically, it is confusing to use the term "stability" to describe all three properties under discussion: 1)the transient...
Forum: Rotorheads
7th Jul 2009, 10:29
Replies: 1,327
Views: 374,687
Posted By NickLappos

pcpahari_IAF, You mix the two effects a bit,...

pcpahari_IAF,

You mix the two effects a bit, they are quite different.

Transient droop of the engine/rotor is due to the lag of the engine in responding to collective pitch. It is measured...
Forum: Rotorheads
22nd Mar 2008, 16:17
Replies: 1,327
Views: 374,687
Posted By NickLappos

Jack is right (he was a Sikorsky Test Pilot,...

Jack is right (he was a Sikorsky Test Pilot, after all!) The HV curve shows the area where the loss of the FIRST engine (one engine left, working its heart out) will result in a hard landing or...
Forum: Rotorheads
10th Mar 2008, 10:20
Replies: 1,327
Views: 374,687
Posted By NickLappos

Geoffersincornwall, You rose to the bait! ...

Geoffersincornwall,
You rose to the bait!
Please note that training is great, and necessary, but mostly because we make flying so hard! Training is NOT the key to ultimate safety, we must fix the...
Forum: Rotorheads
9th Mar 2008, 07:16
Replies: 1,327
Views: 374,687
Posted By NickLappos

As perhaps THE person who started the current...

As perhaps THE person who started the current concern with modern FAR/JAR compliance. I made the first presentations to the Oil companies and Unions that described the true differences legislated by...
Forum: Rotorheads
7th Mar 2008, 04:01
Replies: 1,327
Views: 374,687
Posted By NickLappos

HOSS1, I helped in the original A model pad...

HOSS1,

I helped in the original A model pad shaping and unusable fuel determination. The assumptions we made were very conservative regarding the maneuver state and speeds. A small change in...
Forum: Rotorheads
5th Mar 2008, 19:24
Replies: 1,327
Views: 374,687
Posted By NickLappos

Here you go: ...

Here you go:

http://webpages.charter.net/nlappos/S76Family.jpg
Forum: Rotorheads
5th Mar 2008, 01:18
Replies: 1,327
Views: 374,687
Posted By NickLappos

peterperfect, I don't know of one, I will...

peterperfect,

I don't know of one, I will send your request to the Sikorsky Chief Pilot, he can assign a pilot to make such a matrix - it is a great idea, and perhaps about time!

Nick
Forum: Rotorheads
10th Feb 2008, 16:53
Replies: 1,327
Views: 374,687
Posted By NickLappos

oldhornet, That is the key! I think so it...

oldhornet,

That is the key! I think so it is a bad gyro, usually in roll. Look at the channel indicator to see if the needle jumps, and look for that cyclic throb (oh, throb! throb!) which is...
Forum: Rotorheads
10th Feb 2008, 02:51
Replies: 1,327
Views: 374,687
Posted By NickLappos

Oh please do not change any gearbox for a torque...

Oh please do not change any gearbox for a torque indication - the only thing it can add to a torque problem is the Nr sensor, or a total GB massive malfunction - in which case, you would be writing...
Forum: Rotorheads
8th Feb 2008, 13:36
Replies: 1,327
Views: 374,687
Posted By NickLappos

oldhornet, You described, "a cyclical (in a...

oldhornet,
You described, "a cyclical (in a time sense) vertical for 3 to 4 beats, every 5 seconds or so."
That could be many things, and also by being intermittent, will drive the maintenance...
Forum: Rotorheads
29th Jan 2008, 12:21
Replies: 1,327
Views: 374,687
Posted By NickLappos

cpt, The change in 4P should be easy to...

cpt,

The change in 4P should be easy to measure, get involved with the maintenance guys when they rig the accelerometers. The pilot's seat track outboard vertical tells most of the story. The...
Forum: Rotorheads
28th Jan 2008, 19:41
Replies: 1,327
Views: 374,687
Posted By NickLappos

cpt, In which model S76 are you experiencing...

cpt,
In which model S76 are you experiencing the change?
Forum: Rotorheads
30th Nov 2007, 09:51
Replies: 1,327
Views: 374,687
Posted By NickLappos

FlyingHead, The rear windows jettison because...

FlyingHead,
The rear windows jettison because the sliding door does not. The entire pilot door assemblies jettison. On aircraft with a rear hinged door, the entire door jettisons, as well.
...
Forum: Rotorheads
20th Nov 2007, 21:30
Replies: 1,327
Views: 374,687
Posted By NickLappos

XNR, The EGPWS has that rule in it as an...

XNR,

The EGPWS has that rule in it as an extra, but the caution has no altitude associated with it, since the actual contact point is 14.7 degrees just as the main gear, oleos fully extended,...
Forum: Rotorheads
18th Nov 2007, 18:11
Replies: 1,327
Views: 374,687
Posted By NickLappos

That light is probably the gear warning or the...

That light is probably the gear warning or the rad alt. There is no attitude warning in the 76 series.
Forum: Rotorheads
18th Nov 2007, 16:26
Replies: 1,327
Views: 374,687
Posted By NickLappos

It is just a caution, but wise folks watch. I...

It is just a caution, but wise folks watch. I wrote it. The penalty for exceeding 14.7 degrees is that you touch the tail fairing, scrape the paint and buy your crew chief a case of beer. At nose...
Forum: Rotorheads
25th Aug 2007, 23:08
Replies: 1,327
Views: 374,687
Posted By NickLappos

Nigel has the straight story. There was an...

Nigel has the straight story. There was an accident (Brazil) where the spindle let go, after the steel spindle liner had let go. Without the liner, the spindle had extra motion in lead-lag and...
Forum: Rotorheads
18th Jun 2007, 14:09
Replies: 1,327
Views: 374,687
Posted By NickLappos

dbcooper2, (Nice user-name!) I can't...

dbcooper2,
(Nice user-name!)

I can't possibly advocate taxiing at Nr below the green arc, frankly. Operation at low Nr is not tested, and could lead to heartaches in places we just don't know. ...
Forum: Rotorheads
24th Apr 2007, 20:15
Replies: 1,327
Views: 374,687
Posted By NickLappos

Hoss, I think I will turn in my stripes! You...

Hoss,
I think I will turn in my stripes! You are right, I will delete my old posts just to prevent misleading folks. Thanks
Forum: Rotorheads
18th Apr 2007, 14:58
Replies: 1,327
Views: 374,687
Posted By NickLappos

Rocket, Please don't take my input as gospel,...

Rocket,
Please don't take my input as gospel, thanks for the clarification.

gullibell,
Those Canadians seem to know how to maintain those A's and get parts, they get well over 1000 hrs per year...
Forum: Rotorheads
18th Apr 2007, 00:08
Replies: 1,327
Views: 374,687
Posted By NickLappos

bayou, Your guess is quite correct, those...

bayou,

Your guess is quite correct, those bumps are where the bolts that hold the paddle to the spar underneath are faired in to make them a little smoother.

I would bet they make the blade a...
Forum: Rotorheads
5th Dec 2006, 00:37
Replies: 1,327
Views: 374,687
Posted By NickLappos

The yaw kick maneuver is required to be designed...

The yaw kick maneuver is required to be designed for, but it is not actually performed. I use it to show the kind of structural loads that the helo must withstand, and why a little taxiing is no big...
Showing results 1 to 35 of 101
 
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