Just coincidentally there was a Battle of Britain commemorative church service in town today. My only participation was to listen to the fly past go over my house.
Just coincidentally there was a Battle of Britain commemorative church service in town today. My only participation was to listen to the fly past go over my house.
There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop
I thought elections were decided by angry posts on social media. - F5 Dave
From memory though, most of those were Bombers.
The Spitfire was the Air-superiority fighter, whereas the Hurricane was a more stable Gun platform - allowing it to deal enough damage to take out multi-engined Bombers.
Interestingly enough, it's this same stability that meant it's transition into the Ground-Attack role was also effective.
Physics; Thou art a cruel, heartless Bitch-of-a-Mistress
The purpose of the initial raids on England was to destroy the air defense network prior to the planned German invasion (Operation Sea Lion). Primarily the fighter airfields and radar were targeted. That was the Battle of Britain. Bombers then low level fighters with more bombs on individual targets hit the Airfields ... and then shooting up aircraft, fuel tanks and hangers. They almost succeeded in wiping out the entire Fighter force.
But Hitler ordered a change to the bombing of the cities instead ... as reprisal for the nightly air raids on Germany. German fighters escorted them ... but they were too short in numbers to make a difference in the outcome.
That was the break Britain needed. Time to replace their depleted fighter force numbers.
Not much time ... but enough.
When life throws you a curve ... Lean into it ...
I was always told that the Hurricane was s very good ground attack plane. Never looked further into it though.
from what I can find
Resorcinal is the glue for the plywood its still used as was the key as prior there was no water proof plywood.
So great for the ply but shit for the joining of the two halves.There are variations as to the exact content of different brands. erodux 500 calls itself Resorcinol-Phenol-Formaldehyde, whereas Cascophen refers to its glue as Resorcinol-Formaldehyde
In practical terms resorcinol contains a significant amount of naturally occuring phenols and is similar in action and waterproof qualities to the synthetic phenol formaldehyde glues. Here is my page on Phenol formaldehyde glue.
HomeUrea Formaldehyde glueStitch & Glue BoatbuildingPolyurethanePlansBooks about Boats
Resorcinol Glue
For most amateur boatbuilders Resorcinol is an echo from the past. They might have heard it mentioned in an old book, or some crusty woodworker might have raved about it. Few have ever seen it on sale and fewer have used it. Here is some information.
If I were to say I have a glue that can glue wood. Is immensely strong. Can withstand immersion in salt and fresh water. Does not soften in high heat and become brittle in low temperatures. Has proven its long term effectiveness. Is chemically resistant to acids solvents and oils. Can glue Oak and oily woods. It is harder, slightly stronger in sheer joints, and more permanent than epoxy. You would be overjoyed and would ask what this wonder glue is called.
I would answer it's Resorcinol Glue!!
Many of the boats restored by Howard Percival Johnson were built using resorcinol. Check him out at Old Time World Some eye candy for old motorboat lovers.
What is Resorcinol
Resorcinol is a simple molecule of benzene with 2 Hydroxy bits. It's produced either by using a natural resin such as a distillate of brazilwood and combining it with potassium hydroxide, or by several synthetic methods. This resorcinol is then further treated to produce the wonder adhesives.
THIS IS NOT A CHEMISTRY ARTICLE. If you are interested in the chemistry, check out the Wikipedia Resorcinol Chemistry Article. This is the basis for Resorcinol glue
There are variations as to the exact content of different brands. Aerodux 500 calls itself Resorcinol-Phenol-Formaldehyde, whereas Cascophen refers to its glue as Resorcinol-Formaldehyde. Since the claims from all manufacturers are similar in major traits I will not differentiate and when I say resorcinol or resorcinol formaldehyde I am not saying anything about a specific brand. Differences occur in the setting times, and ideal moisture content of the substrates, for example. All brands claim to be superior waterproof, structural adhesives. All brands have similar warnings and procedures.
In practical terms resorcinol contains a significant amount of naturally occuring phenols and is similar in action and waterproof qualities to the synthetic phenol formaldehyde glues. Here is my page on Phenol formaldehyde glue.
Grasp Resorcinol Adhesive Data Sheet is typical. Available in Australia, it's worth having a look. Others data sheets can be found fromt he links on the left.
What are the Advantages of Resorcinol Glue?
It is Waterproof with a capital W. Passes the boil test with flying colours, AND has been keeping boats together for a great many years. It is one of the few adhesives around that stay strong when wet for extended periods. Outside conditions are not a deterrant for using this glue.
Chemically stable after it has set. It resists Acids, salt water, solvents, oils and most other things. It is sensitive to alkalis.
It is strong. Currently one of its main use is to put together plywood, laminated support beams and other wooden structural elements. Wooden airplanes frameworks have long been glued with resorcinol formulations.
Because it has been around for a long time it has been tested under countless different conditions, and it has passed the long term reliability test.
Resorcinol can withstand a wide range of useful temperatures when cured. It is safe for outside temperature anywhere on this planet. Unlike epoxy it does not soften when it gets warm. It shows no creep and does not get brittle in sub zero conditions
After curing it can be used in a wide range of humidity condition including varying conditions.
Resorcinol can be used as an adhesive for oak and oily woods. Epoxy is noted as a poor oak glue.
Pot life after mixing can be several hours. This is dependant on ambient temperature.
Some formulations can glue wood with quite high moisture content. Best results are at about 12% but satisfactory results have been achieved in the 6-25% range with specialized brands. See technical sheets for more information.
Metal surfaces can be bonded with appropriate preparation and primers.
What are the Disadvantages of using Resorcinol Glues?
It has very poor gap filling capacity. Your joints must be good.
Joints and laminations must be tightly clamped or pressed, often for several hours at room temperature, to be successful. Resorcinol does not like a thick glue joint.
https://www.christinedemerchant.com/...esorcinol.html
Casein was used for early mozzy, I am well familiar with it as I grew up in the dairy industry. yes it don't like getting wet. its still used on beer bottle labels as well as some plastics.
Aeorlite according to one page with no supporting documents was used on mozzys following on from the Casein
there was also something like 300 screws in the wings alone as well.
The BBC did a program on Resorcinal and the mozzy I will see if I can find it.
https://www.bbc.co.uk/history/ww2peo...a7336433.shtml
closest I can find.
What I cant see is why they needed to coat the plane in doped fabric afterwards, unless it was to get it flush or maybe for weather proofing?
looking at the curing an molding tech the Mozzys plannels were molded around concretty and hardwood forms
The Duramold and Haskelite process was first developed in 1937, followed by Gene Vidal's Weldwood and later the Aeromold process produced by the Timm Aircraft Company. In the United Kingdom, the De Havilland Aircraft Company (founded by Geoffrey de Havilland, a cousin of Olivia de Havilland, the actress who dated Howard Hughes in 1938) used similar composite construction for aircraft including the DH.88 Comet, DH.91 Albatross, the Mosquito, and Vampire. The aeromold process differs in that it is baked at a low 100 °F at cutting and forming, and 180 °F for fusing together sections after the resins are added.
I keep trying to remember the simulator at Wigram in the visitors upstairs mezzanine floor is that a mossie?
READ AND UDESTAND
Has anyone here had a flight in a mossie?
compared to a hurricane or spitfire or similar.
wondered what the feeling was like and if you ever forgot the thrill.
READ AND UDESTAND
2016
.................................................. .................................................. .................................................. .................................................
When life throws you a curve ... Lean into it ...
There are currently 1 users browsing this thread. (0 members and 1 guests)
Bookmarks