TonyTMmmm – but if you leave your piece in chemicals for too long, it will dissolve the whole thing (been there, done that!)
The truth is, there is no perfect answer – a softly softly approach is necessary whichever method you use.
Bruce
But then that is failing to follow the correct procedures or the piece you were cleaning was so riddled with tinworm nothing would have saved it……
12jaguar Quote:
Originally Posted by cometguymk1
This might sound an odd question, but what is the “media” that keeps being mentioned?Will
Media is the generic term for the substrate or the actual material used to remove the corrosion/paint. It can be plastic or glass beads, grit or any of the other types mentioned above. St Athans had a purpose built facility for Plastic Media Stripping (PMS) which could paint strip an entire aircraft (Jag/Tornado etc)
True, but that tends to be because most strippers that do a decent job these days are banned and the ones you can use barely do the job,
The Americans are using a laser these days to strip that burns the paint off but touches nothing else. We did some repaint and work on some Navy wetdreams and they were never designed to be stripped of primer, only the top paint, but the Navy wanted a bare metal inspection, getting the paintstripper resistant primers off was a nightmare…
Dr Strangelove What you need is a copy of this,
The Hong Kong Book Of Kung-Fu of the airframe corrosion world
Hmm I tend to be wary of the Military way having served in it, they were still using Yak Sh*t long after Bae etc had dropped it in favour of PRC (Thycol) as it contained water and was introducing it into skin joins……. I also saw the results of putting VC10’s in really poorly designed bags with no dehumidifiers and watching them become self contained greenhouses with the carry through spars sitting in feet of water as the hulls rotted around them from the inside out…….. so much for RAF corrosion control.
TonyTOdd though the permit has only been issued for 3 months??
CofA / Permit: Permit to Fly Validity Expiry: 01/10/2009
TonyTIf it were that soft, the blasting media would remove the metal; the basic problem is that corrosion is microscopic, but the grit (for want of a better word) used to remove it, isn’t.
The outer layer of alclad is pure aluminium and you cannot get much softer than that, your other problem is blasting by it’s action forces corrosion deeper into the material…….. the blasting material does remove metal, that iw why the surface becomes textured as you do it, it also distorts thin materials such as skins…… I have seen what looks like perfectly good skins punctured and destroyed by shot/bead/glass/ice blasting, when you can do the job chemically without any of those problems……
TonyTYou won’t stop stirring will you?
As someone who has donated hundreds of pounds over the years to help get this thing in the air and have travelled to several shows to be dissapointed such as Waddington due to incompetence of the highest order, I think I have earned the right to query how and why the funds are being spent on what is a public funded aircraft, (through both the National Lottery and donations) when it is not fulfilling its primary purpose in life, additionally I have been told the the “corporate” spending is on a scale all of its own……
If they come again and ask for donations, (which they no doubt will.) then i will need to be satisfied that the money is being spent wisely on the Aircraft and not on an incompetent and inept staff before I donate again.
If you simply like to roll over backwards and take it where the sun don’t shine then enjoy it, myself I like to know my money is being spent wisely when I donate.
In a parody of Winston Churchil.
Never in the field of human Aviation was so much paid by so many to so few……
TonyTI don’t see how Carlisle is too close to the sea to stop the vulcan being kept active…….look at the Southend example
Garry
It doesnt, but it means you have to keep on top of corrosion issues which can take up a lot of time and budget…. what I was saying if you reread it, i probably worded it badly, was that the rear shrouds had rotted away, but with it being so close to the sea you could not expect anything else… 🙂
Nice pics Tartan Pics notice something missing on mine? I photoshopped the fuel farm out 😉
TonyTBut as aluminium is soft you tend to get some of the material being blasted folding over areas and trapping it as well, it was not just painters, I was also taught that.
TonyTMe I am still trying to figure out the line…..
Trust accounts show annual staff costs for the financial year ending in March 2009 are likely to be £620,000, while engineering and maintenance costs are estimated at £320,000
If engineering etc is carried out by marshalls and their staff so is inclusive of the £320,000 which one would presume it is, and all of those that tour with the Village are volunteers (and good on them) and pay their own way……..
Who is being paid the £620,000??????????????????????
Well that must be pleming and the board with a couple of office staff, as who else is there? 😡
So nearly half of what was raised was to pay just their wages.
TonyTone wonders if it is down to keep his speed down so as to remain in formation
TonyTI wasn’t suggesting shot blasting, world of difference between using steel, lead or even aluminum shot & glass beads…. 😉
Sorry should have said, bead, was not being type specific, just generic.
TonyTBTW Canon have an outlet on Ebay selling returns etc with full warranty for a lot less as refurbished items, have had scanners etc off them before and saved a bundle. best kept secret if you go the canon route, just find the best price you can for new elsewhere in shops on and offline then do not over bid……. some do! several people I know have bought the Cameras at over £100 less than anywhere else have said of the ones they bought that if they did not know it, they said they would have thought it was brand spanking new.
see
http://stores.shop.ebay.co.uk/Canon-Outlet__W0QQ_armrsZ1
from there blurb
Types of Products Sold
(Refurbished / New)
The products sold on eBay are either classified as “new” or “refurbished” (see the beginning of this item description).
Refurbished products are 100% OK and therefore we can offer them with a 1 year manufacturer’s warranty. There is nothing wrong with these products! All refurbished products are sealed with an authentic Canon seal!
We just can’t sell a refurbished item as new because…
– …it was used as demo product (at trade fairs etc.), or
– …the outside carton box was slightly damaged during transportation (and then replaced by a neutral brown packaging), or
– …it was sold and the box was opened. Then the item got returned to Canon.
Upon return to our facility, a product of this type is put through a full set of functional test procedures, cleaned, repaired (if needed), and refreshed with a set of in-box materials (manuals, accessories, cables…) and sealed. The packaging of the product may either be the original Canon packaging or a neutral (brown) packaging. The core product itself may (exceptionally) contain minor cosmetic blemishes. Please contact us regarding product issues before leaving negative feedback on eBay – Thank you!
TonyTI used a 70-300mm on my old Canon 350D for years with no problems, it was an Imaged Stabilised lens so allows you to shoot at lower speeds without shake worries, these days I also have a Canon 100-400mm IS lens on my 50D but I find I miss the 70mm end of things as I sometimes struggle to get it all in, though I can be closer than average to them taxying.
If you want I could take a pic with both showing the difference in zoom range.
TonyTI had to look twice because I thought G-TYRE was in our hangar lol, went to look today and it was back, but then dissapeared off again 🙂
Some really nice images there, you should be proud 🙂
TonyTNot a problem, it’s how I have earned my living for the last 33 odd years, keeping Aircraft flying ) just ask if you need anything else 🙂
TonyTTony what about pitting from mild to medium on alloy? I can post pics if needed
Hi Peter, using a fine blast will be ok, some companies these days use Dry Ice BTW as a medium, once done the Ice melts back to a gas leaving no residue, A lot of companies beadblast Aircraft corrosion but if the material is thin and the corrosion deep it can take a lot of material off, it can also “stretch” the material , I was told by some painters that with alloys been softer it can push some of the corrosion deeper into the material, but saying that a lot of companies still use it, chemically treating it is just less invasive, especially on older Aircraft and thinner materials. I do still use it in areas on our aircraft, but if I can I use chemicals these days, you can see when it’s killed the corrosion as all the black spots will be gone. Remember though Alclad has a thin layer of pure aluminium on both sides, this acts as a sacrificial layer and like Zinc coating “self seals” over scratches etc protecting the alloy underneath, when treating corrosion this is often lost, so you need to replace it with something such as paint etc
Do read the FAA link I gave you, it is very good and full of lots of information, indeed there are paragraphs on most things, wood, fabric, repairs, electrics, welding etc. It is a goldmine and free
TonyTWhere the metal is corroding as shown in the picture and is Exfoliating ( going like layers of puff pastry), the only way you can get rid of that is to remove metal back down to solid.
Chapter 6 on here is the FAA Engineers maintainance manual on dealing and treating corrosions, along with all repairs aircraft wise, it will show you how to identify the corrosion you have, the treatment and the repair methods…..
Think that just about covers all of your questions….. 🙂
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