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Search: Posts Made By: HeliTester
Showing results 1 to 35 of 107
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Forum: Rotorheads
25th Jul 2023, 16:19
Replies: 47
Views: 10,496
Posted By HeliTester

JimL, Earlier in this thread you mentioned...

JimL,

Earlier in this thread you mentioned the adoption of the helicopter Performance Classes. Perhaps some additional discussion about the performance classes and their impact on Category A...
Forum: Rotorheads
29th May 2023, 01:28
Replies: 47
Views: 10,496
Posted By HeliTester

alexandre.vidual, Extrapolating the PC1...

alexandre.vidual,

Extrapolating the PC1 chart shows that increasing the TDP/Vtoss by 1-kt (above the limit) would produce 26,500 lb at sea level 34˚C, but you obviously can’t exceed the TDP/Vtoss...
Forum: Rotorheads
28th May 2023, 19:15
Replies: 47
Views: 10,496
Posted By HeliTester

The answer is: Not always for the reasons...

The answer is: Not always for the reasons previously explained in this thread. You noted that you can operate in PC1 at 26,500 lb, at sea level, 32C, using the maximum TDP/Vtoss, but that you have to...
Forum: Rotorheads
27th May 2023, 21:57
Replies: 47
Views: 10,496
Posted By HeliTester

As JimL correctly stated, you are mixing oranges...

As JimL correctly stated, you are mixing oranges (PC1) and apples (PC2). The OEI climb performance Certification requirements are different. As 212man explained, PC2 has no first segment OEI climb...
Forum: Rotorheads
5th Oct 2021, 22:54
Replies: 444
Views: 155,033
Posted By HeliTester

What about the CH-46, CH-47, SH-3, UH-60, and all...

What about the CH-46, CH-47, SH-3, UH-60, and all their derivatives that have been operational for about six decades? Does The Sultan judge these to be legendary acquisition failures as well?
Forum: Rotorheads
13th Oct 2020, 03:16
Replies: 19
Views: 3,522
Posted By HeliTester

Crab and gulliBell nailed it. The OEMs have...

Crab and gulliBell nailed it. The OEMs have already done the performance optimization work as part of the Certification Process. They measure power required to fly at all airspeeds between Vtoss and...
Forum: Rotorheads
22nd Apr 2020, 15:42
Replies: 16
Views: 3,274
Posted By HeliTester

S-76B is certified in Category A and is approved...

S-76B is certified in Category A and is approved to operate in PC1 to/from elevated helidecks. Don't know about A109e.
Forum: Rotorheads
23rd Feb 2019, 21:19
Replies: 30
Views: 6,836
Posted By HeliTester

Like the V-22 the production V-280 will be self...

Like the V-22 the production V-280 will be self deplorable anywhere in the world and not need an air lift. As for the Sb-1 Defiant it is not self deployable and will not fit in a transport without...
Forum: Rotorheads
4th Apr 2018, 20:10
Replies: 17
Views: 5,040
Posted By HeliTester

santynavayath...... Your original...

santynavayath......


Your original question deals with the S-92, and since the S-92 does not have a Dual Engine 30-Minute power rating (during forward flight), a service ceiling climb validation...
Forum: Rotorheads
3rd Apr 2018, 19:41
Replies: 17
Views: 5,040
Posted By HeliTester

To find the service ceiling as a function of...

To find the service ceiling as a function of Weight, Altitude, and Temperature, go to Part 1, Section IV (Performance Information) of the Flight Manual and locate the chart entitled “Forward Climb...
Forum: Rotorheads
2nd Jul 2017, 16:34
Replies: 16
Views: 2,465
Posted By HeliTester

Enlightening explanation. :)

Enlightening explanation. :)
Forum: Rotorheads
27th May 2017, 20:49
Replies: 22
Views: 5,928
Posted By HeliTester

tisitisnot....I stand corrected. Located an S-76B...

tisitisnot....I stand corrected. Located an S-76B RFM describing the blowaway function on that model. States that the dual engine limits are reset to 844 T5, 101.6% N1, and 115% Q When Nr droops...
Forum: Rotorheads
27th May 2017, 15:57
Replies: 22
Views: 5,928
Posted By HeliTester

I believe that should read "S-76C+ and newer...

I believe that should read "S-76C+ and newer models have blowaway power."
Forum: Rotorheads
14th Aug 2016, 22:29
Replies: 9
Views: 2,180
Posted By HeliTester

Check out "Aerodynamics of the Helicopter" by...

Check out "Aerodynamics of the Helicopter" by Gessow & Myers. Originally printed in the 1950's, this has long been recognized as a standard rotary wing textbook that addresses the basic principles of...
Forum: Rotorheads
27th Jul 2016, 21:34
Replies: 108
Views: 70,696
Posted By HeliTester

Wow! Startling comment!

Wow! Startling comment!
Forum: Rotorheads
21st Apr 2016, 21:24
Replies: 108
Views: 53,103
Posted By HeliTester

Before it got hijacked, this thread featured...

Before it got hijacked, this thread featured relevant discussion about an important topic.
Forum: Rotorheads
4th Feb 2016, 22:01
Replies: 40
Views: 23,118
Posted By HeliTester

Are you asking can you do a Category A,...

Are you asking can you do a Category A, Performance Class 2 takeoff? If so, I think they are mutually exclusive. (Perhaps Mars can help me out with that one). I think you can only do a Category A,...
Forum: Rotorheads
19th Oct 2015, 21:04
Replies: 488
Views: 208,994
Posted By HeliTester

I am also Curious. What is this self-aggrandizing...

I am also Curious. What is this self-aggrandizing structure? Perhaps someone could post a photo of it.
Forum: Rotorheads
30th Aug 2015, 20:48
Replies: 13
Views: 3,849
Posted By HeliTester

According to Sikorsky Archives, the CH-37 was...

According to Sikorsky Archives, the CH-37 was designed in response to a US Navy specification. The proposed helicopter was offered with both reciprocating and turbine engines. Apparently it was the...
Forum: Rotorheads
30th Jul 2015, 16:18
Replies: 86
Views: 14,442
Posted By HeliTester

Crab, The merits of dynamic vs. benign...

Crab,

The merits of dynamic vs. benign helipad vertical takeoff procedures have been debated for decades. The Category A vertical procedure WAT curve is based primarily on the ability of the...
Forum: Rotorheads
29th Jul 2015, 15:31
Replies: 86
Views: 14,442
Posted By HeliTester

I note that all published vertical takeoff...

I note that all published vertical takeoff procedures are not particularly gentle. At least one Category A vertical helipad procedure (S-76) uses rapid collective application from wheels light to...
Forum: Rotorheads
18th Jun 2015, 01:53
Replies: 32
Views: 12,627
Posted By HeliTester

I don't buy it either. UTC CEO Gregory Hayes said...

I don't buy it either. UTC CEO Gregory Hayes said the "separation of Sikorsky from the portfolio will allow both United Technologies and Sikorsky to better focus on their core businesses." United...
Forum: Rotorheads
2nd Jan 2015, 20:55
Replies: 26
Views: 7,556
Posted By HeliTester

NickLappos writes… In addition, some...

NickLappos writes…
In addition, some Manufacturers offer selectable OEI Vtoss in the 40-60 knot range and provide performance charts that give climb angle as a function of weight, altitude, air...
Forum: Rotorheads
2nd Nov 2014, 20:54
Replies: 43
Views: 39,151
Posted By HeliTester

And I believe that the "just don't cut it" S-76...

And I believe that the "just don't cut it" S-76 is still 'The chariot of choice' for helicopter transportation of the British Royal Family.
Forum: Rotorheads
29th Oct 2014, 00:27
Replies: 43
Views: 39,151
Posted By HeliTester

"Actually Sikorsky ain't seeing quite the same...

"Actually Sikorsky ain't seeing quite the same growth because their helicopters just don't cut it."

Are there data available to substantiate that claim?
Forum: Rotorheads
19th Aug 2014, 14:24
Replies: 214
Views: 160,674
Posted By HeliTester

With respect to Category A takekoff, the...

With respect to Category A takekoff, the following guidance is provided on page B-38 of Advisory Circular 29-2C.

AC 29.59(b)(2)(i)...The CDP should be definable with the minimum crew using...
Forum: Rotorheads
12th Aug 2014, 04:15
Replies: 108
Views: 53,103
Posted By HeliTester

JimL makes a very compelling argument for EASA...

JimL makes a very compelling argument for EASA OPS to mirror JAR-OPS-3. Because FAA has no operational performance requirements for helicopters (and likely won’t have in the foreseeable future),...
Forum: Rotorheads
2nd Aug 2014, 22:23
Replies: 108
Views: 53,103
Posted By HeliTester

Jim, I found EASA NPA 2014-19 to be a...

Jim,

I found EASA NPA 2014-19 to be a difficult read. Then after reading your comments and considering the intent of the NPA expressed in the executive summary, I find myself asking the (possibly...
Forum: Rotorheads
29th Jun 2014, 15:46
Replies: 11
Views: 2,419
Posted By HeliTester

Sir Korsky, You state that.. What is...

Sir Korsky,

You state that..

What is the basis for that statement?

HT
Forum: Flight Testing
10th Apr 2014, 17:44
Replies: 8
Views: 4,031
Posted By HeliTester

If this aircraft achieved the stated performance...

If this aircraft achieved the stated performance prior to the gearbox change and nothing else was changed, then the gearbox is certainly suspect. But if the replacement gearbox has enough internal...
Forum: Flight Testing
10th Apr 2014, 04:02
Replies: 8
Views: 4,031
Posted By HeliTester

Rigging shouldn't affect power required to hover,...

Rigging shouldn't affect power required to hover, but it can change the control position required to generate a given torque.
Forum: Rotorheads
14th Feb 2014, 02:19
Replies: 40
Views: 23,118
Posted By HeliTester

Operations Manuals are developed by the operators...

Operations Manuals are developed by the operators and approved by the appropriate Aviation Authority that oversees their operations. They are called Operational Approvals as opposed to Certification...
Forum: Rotorheads
7th Oct 2013, 15:50
Replies: 85
Views: 35,747
Posted By HeliTester

How do you know this?

How do you know this?
Forum: Rotorheads
19th Aug 2013, 12:57
Replies: 48
Views: 17,972
Posted By HeliTester

The metric is engine failure rate and takes into...

The metric is engine failure rate and takes into account the sample size. Using the Robinson example, even if there were more Robinson crashes (because there are more Robinsons around), the Robinson...
Forum: Rotorheads
18th Aug 2013, 20:03
Replies: 48
Views: 17,972
Posted By HeliTester

I think what the Europeans have done to establish...

I think what the Europeans have done to establish minimum engine reliability standards for certain PC2 operations (not more than one in-flight engine shut-down per 100,000 flight hours in the most...
Showing results 1 to 35 of 107
 
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