dov
-
Posts
2,156 -
Joined
-
Last visited
-
Days Won
9
Content Type
Events
Profiles
Forums
Media Demo
Posts posted by dov
-
-
Actually check all IDF sources. Also hier in the forum.
Almost, not all you can use on the F-15I Raa'm.
Someone else will know the US specials.
Happy modelling
-
Because of an error in my Dh.9a I cam across this correction site:
http://www.wingnutwings.com/ww/15B48F884B9E3140CCA0F16140ED0BF5
Check your stash!
Happy modelling
-
Hallo
The WW1 a/c I built some in 1/48, one in 1/72. The development was driven by the ability for rigging.
After the accurate rigging technique was established, I shifted to 1/32 from WNW and Roden.
I learned to understand the actual rigging on an airplane and to modify it. This is the backbone.
I do my eyelets with 0,13 thin copper wire, the rigging wire is a 0,13mm monofilament for fishing and the tubes from Albin-Aloys.
This is the most expensive item. The author of WW1aircraftmodelling showed me this via web. The handling technique I had to learn.
My favorite a/c are Dh.2 and FE.2b. As you can see on the forum.
My WW1 stash is not so numerous as yours, since I built so much. Still ahead are:
Albatros B.II Early version Wingnut 32046
Albatros D.I Roden 614
Albatros D.III Roden 606
Bristol Fighter Wingnut
DH 2 Wingnut
Gotha G.I Wingnut
Halberstadt Wingnut
Hansa-Brandenburg W.12 Wingnut 32036
S.E.5a 'Hisso' Wingnut
RAF S.E.5a w /Hispano Suiza Roden
RE.8 Wingnut
Rumpler C.IV late version Wingnut
The Friedrichshafen 33 from Luckgraph will come soon too.
Happy modelling
-
2
-
-
Well, Roden is not so bad.
Sugest you, use the WNW instructions to get more information.
I also have Albatros I, III and Se.5 to build from Roden.
It is a nice challange too.
Happy modelling
-
1
-
-
Hallo
This is my next (after many) WNW kit. The Dh 9a is a quite big and powerful a/c. Well, I built so far quite straight from the box. Seatbelts are waiting for tomorrow.
Nothing special. As you see, I lost one dial. It is replaced in meantime.
Happy modelling
-
11
-
-
Yesterday evening I got on Eric Brown’s report log in my shelf.
He claimed for the Fw-190 high stick forces on high speed (530 km/h and above) on the elevator.
Yesterday morning I read the website of a fellow from the Whirlwind.
https://www.whirlwindfighterproject.co.uk/arm-waving-aerodynamics/
The tail presents two symmetrical airfoils at 90 degrees to each other.
Where they both meet at the same position of their thickest portion the airflow is accelerated by up to 40% and the pressure drops accordingly.
At flying speed there is subsequent flow separation, rapid flow deceleration, and extreme turbulence. This is the classic ‘interference drag’.
In comparison of the tails of some fighters, where the P-47 has a very large movable control surface of the elevator, but consider the tiny CSE of German fighters.
One more thing is to compare: The position of the elevator & rudder.
Here we find some interferences as mentioned in the Westland report.
The tail presents two symmetrical aerofoils at 90 degrees to each other.
Not to 100% but close to get overspeed & low pressure in critical areas.
Consequently, attributes mentioned on the Fw-190 can be explained and understood quite well.
The cleanest aerodynamic tail obeying all rules has the P-51!
So do I think.
-
Hallo Dr. K.
I am very pleased to hear, that you as a mathematician are on our forum. Me, I am retired mechanical engineer with a Ph.D. My background was gasdynamic and stress and stiffness analysis, before I got two and half decades ago in logic system developments.
In my desire to understand the world and people I was shifted two decades ago to philosophy. Since the daily battle for logic with the human gave me an insight. This pattern of neglecting sometimes hidden logic by particular persons is interesting.
So, maybe you can give some input, on interesting math bound posts.
As an example:
Would like to hear from you.
Happy modelling
-
Hallo Mr. Dr. K
Wellcome as mathematican.
I have some issues in the forum I would like to discuss with you! Mathematic!
Happy modelling
-
1
-
-
Hallo
Thanks to ChocolateCrisps for the Whirwind information.
To add:
Airscrew design, or propeller design, belongs to the most complicated fields in aerodynamic.
As well mathematic as in physical matters.
The influence of the airscrew wash for any unintended results in flight characteristic is one side.
The other one are intended results. Which may increase or decrease the performance of any a/c. However intended.
Each a/c in WW2 times was a mixture of clear design philosophy, guessing (lack of automatic calculation), (lack in knowledge of the sound barrier), and time pressure.
Material was not so much the problem in Britain as in Germany or Japan.
The Whirlwind project is from today’s point of view a masterpiece!
Of flaws, not knowing, and with a time gap of creating something else.
The Mosquito and the Whirlwind have something in design in common.
Concerning integrated wing & cooling system and so on. The lessons were learned at the Mosquito.
The interference of the prop wash is a fact.
Happy modelling
-
Ok, the internal is it, which varies! I did not think about that.
Thanks, got it!
-
1
-
-
Once again to my question, since I supose it was not understood:
I wonder about the elevator control cables, since the control cables are lead in X.
That means inverse to usual aircraft.
Bristol F2b
In comparison to the Re.8
https://thevintageaviator.co.nz/projects/aircraft/re8/detail/air-air
Here the elevator control cables are parallel.
Why are this flight controls inverted in the F2b in opposition to the Re.8 ?
Isn't it dangerous?
This was my question!
Happy modelling
-
Hallo
Here I want to draw a little more detail in your picture. The influence of the propeller in dynamics only:
The torque moment of such a strong engine with such a huge propeller causes because of the high ω Omega (rad/sec)
or in numbers (rotations per minute/π) and the high mass moment of inertia Θ (Deta) a very huge gyroscopic moment.
In all flight situations and all flight levels. In dynamic flight configurations you also must calculate the Coriolis torque.
ac = 2* ω * v
ω = rate of turning in (rad/sec)
V= speed in (m/sec)
Only one force can change the current speed of a body in terms of magnitude or direction, because out of itself it "wants" to always move in a straight line. If you now want to go to the center on a painted straight line on a turntable, the movement only appears straight when viewed from the turntable, but curved from the solid ground outside the turntable. This second assessment by a stationary observer is crucial here. So in order to walk straight on the disc anyway, you need the force from the side that is necessary for every curved movement. If you are prepared for it, you can apply that force, much like bracing yourself against a strong crosswind. It seems to the walker that he has to use this force against something that would distract him. This something is called the Coriolis Force.
The missing knowledge of dynamic forces and torques is the evil.
Read: Aerobatics by Neil Williams and practice it.
The missing knowledge of flight dynamics is until present day the source of endless contradictory tails.
It is absolute in vain to discuss about it. All test pilots, also Eric Brown were prone to this knowledge!
All reports and testimony from fighter pilots are strong influenced by propaganda
and their own little world where they were engaged and risked or gave their life.
This knowledge is also absent on most holder of a private license too.
Only practice in aerobatics can give you a solid base of understanding.
The influence of the propeller in aerodynamics is much more complex. This is the big difference of behavior of any a/c with prop vs. jet engine.
Happy modelling
-
Hallo
Has anybody an idea about the flying controls of the Bristol Fighter of Dh 9a?
I wonder about the elevator control, since the control wire are lead in X.
That means inverse to usual aircraft.
Stick forward means nose up and vice versa, against normal controls stick forward indicates a nose down.
Why are this flight controls inverted?
Were flying accidents a consequence of it?
Maybe you know it!
-
Quote
Where are the speeds being quoted from and whether they are Indicated or True air speeds? What is prolonged, dreadful and high speed when it comes to the Fw190, such handling tends to mean low limiting mach numbers. Or it is to do with the fall off of roll rate with speed? No one went to maximum dive speed in a bounce, the preference was to be fast enough disengagement was easy, the bigger the speed difference the harder the shot.
Speed of sound is defined by √κ*R*T that means that the speed of sound is variable by Temperature.
The true air speed divided by actual speed of sound is the Mach number, you look for.
So: The IAS or TAS may vary each day, that the same critical Mach number is noticed!
Got it?
-
Hallo
Now I finished my Dolphin. The rigging was unspectacular.
One of the holes in the struts to get the struts rigged, vanished due to plastic glue. But in general nice built.
See my WIP.
Next will be the DH 9a from WNW.
Happy modelling
-
22
-
1
-
-
Hallo
I will start to give you a short but understandable information what game theory is, and why it is so extremely powerful. In application in many fields.
https://en.wikipedia.org/wiki/Game_theory
Basic is mathematic. Wider logic in mathematic and formulations of logic which were summed up by B. Russel.
https://en.wikipedia.org/wiki/Bertrand_Russell
In his book Principia Mathematica he made the logic foundation.
https://en.wikipedia.org/wiki/Principia_Mathematica
Game theory can be used for games, but it was designed to create precise decisions based on settings available. With settings available to find out the best solution by mathematic rules. So, that it can be easily understood, overseen. Today’s game theory also can find dynamic solution in a very complex dynamic field too. This is not to explain here.
The basic example is the prisoner's dilemma.
https://en.wikipedia.org/wiki/Prisoner's_dilemma
In short terms:
Two people are playing a game. Each player wants to win. By all means. Each game has some rules. Each possible outcome can be described. If there are two possible results, you get a matrix of 2 x 2.
You may have that two players oppose each other (military, card game), have common interests, or other settings which I will not refer too.
In February 1943 General Kenney, Commander of the Allied Air Forces in southern pacific had a problem: The Japanese Forces wanted to strengthen their army in New-Guinean. They had two possible paths. Northern of New Britannia with rainy weather or southern of New Britannia with normal weather conditions. In each case the path would take three days.
General Kenney had to decide, where to station his reconnaissance a/c. The Japanese forces wanted to get less exhibited to allied bombs. Kenney wanted the opposite. The Matrix shows you the number of days, where the allies had the chance to bomb the Japanese forces.
Japanese Forces
Northern path Southern path
Allies Northern path 2 days 2 days
Southern path 1 day 3 days
In this case, both players have to decide without information about the opposite. No player knows the strategy the other player chooses. The analyses of this setting is quite simple, but just to give you a glimpse what is on. Take the Japanese side of view: No matter how the allies will decide, it minimizes the chance to be bombed by the allies. After getting this into account, it is easy to understand that the northern path will be most likely to be taken into account.
Exert from the book: Game Theory for not mathematician by Morton D. Davis.
Maybe I could give you a slight glimpse how mathematic decides a war. Generals must be fit in this field. Germans were not. Absolutely not. This was a game changer beside the stuff you see. The background is it.
Happy thinking, maybe I could trigger some interest beside modelling and history books.
Enjoy it
-
1
-
-
Actually, we moved a little away from the topic Graham Boak, but your post is fascinating. In dogfighting are sooo many opinions, but just a few flew them by themselves. For anybody of you, who has practiced acrobatic flying, or know about it fundamentally, can get a clue what flying under such circumstances is. I heard by personal conversations many ex-fighter pilots telling me their active flying. Germans and British. Each tale is a point, all tales differ a lot from the next.
But to make a turn in the discussion to our prime topic, I will give you an interesting hint. The Allies in WW2 did one miracle wonderful thing. This is today called operation research. That means to recalculate by mathematic all efforts in battle from the maintenance, take off, flight, battle and return under maintenance getting ready for the next ops. In all fields. Air Force, Navy, Army.
This operation research dismantled each doing by thousands of statistics and was beside mass production and intelligence the backbone of success. Maybe you heard about this matter, maybe not. Some surprising dismantling of squadrons were the consequence out of it. Some shifts in the theater of operation also the consequence of effectiveness or waste of material or personal.
As a matter of fact, the famous Red Tail squadron was so prone on maintenance, this was the very edge of getting dismantled. Faraway of racism. Just one picturesque example.
Each bomb raid was analyzed to the very detail in statistic of weapon, material like a/c and personal.
This network of research was a backbone, like today in every economical enterprise.
Another fact:
The decisions made by the Allies were already based on what is today called game theory. I do not know if you have the slightest clue what it is? Neumann based on this the advice to drop the 2nd atomic bomb on Nagasaki. Game theory is also deadly. This theory is todays backbone for nearly all decisions in economy, stock exchange, military and politic. I will refer about it, if you like.
Maybe a fellow has more details about it. Thank you to all who contribute their knowledge. Interesting global communication about such a topic.
Happy modelling
-
I would like to sketch an example here as the unseen consequence of war damage caused by the area bombing:
In the city of St. Veit an der Glan in Carinthia, Austria, a former British occupation zone 1945 to 1955, in the late 1950s, the following happened:
A German company in the automotive industry wanted to set up a production plant here. There was a storm of indignation. For fear of the following wars and area bombings, the construction of the factory was refused by citizen protests. There were similar patterns in other areas in Austria too. An aversion to industry that should not be underestimated. Long before today's debates on environmental protection.
Another pattern in society happened also as a result of the bomber war. Each town was equipped with an alarm siren. For bomber raids. All this sirens were used after the war for civil fire alarms. As a child I broke to tears and fear, when this sirens were on. Todays jargon you may say: We were traumatized. This is reality unwritten and unknown.
Even at this days when propeller aircrafts were flying only, each engine noise made us fear. I was born after the war, but the tales of the older generation caused such a fear, sometimes I lay awake during the whole night.
War is a bad thing. But we also should always pay attention to the not visible damage. Here, I want to mention the modern archeology from airfield buildings in Great Britain. Once in Duxford I saw a book about it. When cross reading the book, I saw graffiti’s from airman US and GB nationality, who wrote about their fear and hope. The same you may find in late war fuselages inside from forced labors written on the metal sheet.
In all ways thank you for the comments. Astonishing, exciting. Congratulation you all.
Happy modelling
-
2
-
-
I am still working on this subject. Actually I use in the matter of gold a clear yellow. If you try a short burst in fine diluted gold inside the glass, you may be successful. But try it on a spare part.
I use for all subjects Mr. Color C paints. Reducing the pressure to 1,5 bar. Please use spare parts, until you achieve a constant quality.
Happy modelling
-
Really nice pictures and a good work you did.
Could you resize your photos, the upload time on Google Chrom takes more than a minute.
With https://www.irfanview.com/ Irfanview you can resize and rename as you like.
Beside you save much space on your disk anyway.
Happy modelling
-
Assembled & decals done.
Next time rigging. More in RIP next week, so I hope.
-
1
-
-
If it is the number which counts, and not the perfect technology to win a war.
But there is one thing more which counts. Information. Information, deciphering, radio, radar all the electronic devices made the main input in the war.
Beside this the mass production. Consider the BB or Mid Way without deciphering?
And they need the courage to take measures that disturb the opponent.
In 1940, for example, Germany decided not to use the foil strips, to disturb British radar.
With the argument that knowing about it could lead to disrupting German radar.
Or to think the opponent is stupid that he cannot come up with it himself. By itself.
-
What can we learn out of it?
Let us assume that around 1938 all countries in the world were trading and maintaining free trade. What would the world have looked like then?
Peaceful or so warlike?
In order to avoid major wars in the future, all human beings must have wide-ranging needs.
Oil is still an important resource today, but as electro mobility increases, it will be the materials for batteries.
Now that all of mankind is using computers and smartphones on a large scale, the materials for making them are in short supply.
Even today we are militarily securing these areas where the material is mined.
Only free trade without export bans can secure global peace?
-
The United States Strategic Bombing Survey Reports from Europe and Japan gave me a good picture of the overall situation.
From the German side I have it all around from my home in Austria.
In my life I was confronted with the results of the war.
The fruit of peace and the fruit of economy.
The todays knowledge about the war and war industry and many other stories behind changed this picture.
As all your posts showed me interesting facets from the British point of view.
Now a big step to todays discussion about world climate, so I assume that this war was the trigger for the economy to ruin our planet.
The Allies succeeded, but is the price which we will have to pay and future generations justified?
Happy modelling
-
1
-
WingNut Wing CORRECTION
in Aircraft WWI
Posted
Quite logic:
Check the website, there are a lots of all WNW models listed, where errors are in the instruction.
It maybe helpful, if you want to prevent errors.
Any more explanation needed?