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Search: Posts Made By: blakmax
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Forum: Rotorheads
2nd Aug 2019, 11:37
Replies: 221
Views: 93,135
Posted By blakmax

paint

Regrettably paint will not stop moisture absorption, it will only slow it for a while. The best thing about looking at the paint is that any disbond will cause fracking in the paint and that may*...
Forum: Rotorheads
2nd Aug 2019, 00:58
Replies: 221
Views: 93,135
Posted By blakmax

I sent you a PM

Hi Arrrj

I sent a PM. Please respond.

Blakmax
Forum: Rotorheads
1st Aug 2019, 12:27
Replies: 221
Views: 93,135
Posted By blakmax

Environmental effects

Hi Crab,

Firstly, the blades I have worked with were not in AUS but they were in a tropical island location, so your point is transferrable. The issue of bond degradation is related directly fly...
Forum: Rotorheads
1st Aug 2019, 10:04
Replies: 221
Views: 93,135
Posted By blakmax

Hi Old Dog

You are too modest Old Dog. It was your excellent observation during pre-flight that saved your life. After that, it was pure chance that I knew the guy from DTA that was looking at the issue, and...
Forum: Rotorheads
31st Jul 2019, 11:39
Replies: 221
Views: 93,135
Posted By blakmax

Blade production processes

As an adhesive bond failure forensics specialist, I am very familiar with issues relating to the -5 blades, but I was far more confident with the -7 blade processes, so I am very surprised and...
Forum: Rotorheads
4th May 2015, 05:49
Replies: 221
Views: 93,135
Posted By blakmax

Rumour wrong

Heard directly from the maintainer. The defect found when reworking the blade was not a disbond.

Blakmax
Forum: Rotorheads
30th Apr 2015, 09:23
Replies: 221
Views: 93,135
Posted By blakmax

Rumour of bond issues

Heard a whisper that one company undertaking the -7 blade mods actually found a disbond. Maybe there is a connection between disbonds in the transition zone and the initiation of cracking?

Blakmax
Forum: Rotorheads
31st Mar 2015, 09:59
Replies: 221
Views: 93,135
Posted By blakmax

RHC Service Bulletin- You shape the new blades to stop the cracks?

Evidently there is a new SB from RHC requiring owners to modify the blade shape on -7 blades to reduce stress concentrations??? R44 SB 89 23 Feb 2015 refers.

Surely they did fatigue testing of...
Forum: Rotorheads
24th Feb 2015, 08:49
Replies: 221
Views: 93,135
Posted By blakmax

repair blades?

Just some clarification 500H:



Do you include disbonds as being repaired? If so, please tell me it is by rebuilding, not just sqeezing fresh adhesive into the gap!

Regards

Blakmax
Forum: Rotorheads
23rd Feb 2015, 01:18
Replies: 221
Views: 93,135
Posted By blakmax

Core issues

I have had another look at the blade profile and I think it is still possible to make the blade with a uniform core profile and no joints.

Disregard the last message from me.

Blakmax
Forum: Rotorheads
22nd Feb 2015, 12:44
Replies: 221
Views: 93,135
Posted By blakmax

Interesting!

Thanks Chopjock

I am intrigued. The previous designs had a relatively uniform chord with the additional TE section added by inserting a metal strip behind the uniform core profile to support the...
Forum: Rotorheads
22nd Feb 2015, 11:16
Replies: 221
Views: 93,135
Posted By blakmax

Clarification

Chopjock

Just to be clear. I agree with Snoopy's assessment of the sense involved in the postings. I do not agree that Robbo Eng needs to be banned. Indeed, there have been suggestions that as a...
Forum: Rotorheads
22nd Feb 2015, 09:02
Replies: 221
Views: 93,135
Posted By blakmax

Crikey Snoopy, we agree on the lack of sense in...

Crikey Snoopy, we agree on the lack of sense in these postings:

Actually the Appendix to aair200302820_001 VH OHA lists details of two blades with disbonds in the root fitting with ZERO flight...
Forum: Rotorheads
22nd Feb 2015, 07:52
Replies: 221
Views: 93,135
Posted By blakmax

Robbie Engineer Maybe you and I live in a...

Robbie Engineer

Maybe you and I live in a different Australia?



Here are three after a very short search:

aair200302820_001 VH OHA 20 Jun 2003 2 fatalities blade failure
Forum: Rotorheads
21st Feb 2015, 11:08
Replies: 221
Views: 93,135
Posted By blakmax

TET

Tet

There may be an element of stress concentration at the curve in the back of the blade, and it is possible that a nick in the metal led to cracking. However, there may also be underlying...
Forum: Rotorheads
21st Feb 2015, 03:27
Replies: 221
Views: 93,135
Posted By blakmax

This may also be of interest. It is also a -7...

This may also be of interest. It is also a -7 blade also in NZ.
...
Forum: Rotorheads
21st Feb 2015, 01:24
Replies: 221
Views: 93,135
Posted By blakmax

Now what?

CAA NZ has grounded all R44s because of concerns about the blades following the apparent failure of a -7 blade, yes -7.



Choppers grounded following fatal crash | Stuff.co.nz...
Forum: Rotorheads
17th Feb 2015, 10:21
Replies: 221
Views: 93,135
Posted By blakmax

Repair procedures

Sorry vfr440 I missed the comment in the last sentence. If you really want to start a steamy discussion, ask me about "approved repair procedures". Let's start here.
...
Forum: Rotorheads
17th Feb 2015, 10:03
Replies: 221
Views: 93,135
Posted By blakmax

Composites

vfr440

You touch on a topic that annoys me. Most industry and the FAA consider "composites" to mean the fibre-reinforced material as well as adhesive bonding. I have never understood why. The...
Forum: Rotorheads
17th Feb 2015, 09:31
Replies: 221
Views: 93,135
Posted By blakmax

I have some sympathy for RHC

Guys, it may be a bit of a shock given my previous postings on the blade issue, but I actually have some sympathy for RHC.

The problem with these blades is related to degradation of the bond ...
Forum: Rotorheads
13th Feb 2015, 11:08
Replies: 221
Views: 93,135
Posted By blakmax

Blakhawk blade

Sorry Lone wolf, I got wrapped up in the other debate and forgot to respond.

I had seen the article and it certainly looks interesting from a composites perspective, but without close up photos I...
Forum: Rotorheads
13th Feb 2015, 03:46
Replies: 221
Views: 93,135
Posted By blakmax

13 Snoopy I don't have to convince you of...

13 Snoopy

I don't have to convince you of the theory, mate! Read the AD:



Tell me what part of my "theory" isn't supported by the FAA statement?

Even NASA agrees with my proposition that...
Forum: Rotorheads
12th Feb 2015, 12:09
Replies: 221
Views: 93,135
Posted By blakmax

Thanks Helilog. I have heard along the grape vine...

Thanks Helilog. I have heard along the grape vine that RHC has changed some practices, but you will never get told directly for commercial and legal reasons. The FAA has taken my comments on board...
Forum: Rotorheads
11th Feb 2015, 23:10
Replies: 221
Views: 93,135
Posted By blakmax

Oh dear! Did you even bother to look at the link...

Oh dear! Did you even bother to look at the link I provided or are you just adopting a stand whereby unless you are a pilot a contributor can not possibly comment on what are in fact technical...
Forum: Rotorheads
11th Feb 2015, 11:49
Replies: 221
Views: 93,135
Posted By blakmax

Comment from the Moderators?

C-Steve

I think you raise a fundamental question about this forum. Is it a "pilots only" forum? I don't see that in the term "Rotorheads" but maybe others do. Yes it is Professional Pilots Rumour...
Forum: Rotorheads
11th Feb 2015, 03:03
Replies: 221
Views: 93,135
Posted By blakmax

13 snoopy I assure you I am not Cockney Steve,...

13 snoopy I assure you I am not Cockney Steve, and I have never met him. With regard to the blade issue, I suggest you read this and draw your own conclusions:
...
Forum: Rotorheads
10th Feb 2015, 11:16
Replies: 221
Views: 93,135
Posted By blakmax

Give him a break!

I have sympathy for Cockney Steve here. You guys attack him because he has not flown in a Robinson as passenger or as pilot so how could he possibly know anything?

Well, I am not a pilot and I...
Forum: Rotorheads
9th Feb 2015, 07:44
Replies: 221
Views: 93,135
Posted By blakmax

Cockney Steve

I have sent you a PM.

Blakmax
Showing results 1 to 28 of 28


 
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