• hubbabubba's Avatar
    Today, 17:08
    hubbabubba replied to a thread The Ugly Duckling in The NewsHawks
    Talk of a coincidence... This article appeared a few days ago in FlightGlobal; HERE . The subject of this thread doesn't make the list btw... Beauty (and ugliness) being in the eye of the beholder, I personally think that any heavier-than-air that can sustain flight has its own charm.:love_heart:
    3 replies | 164 view(s)
  • Ivan's Avatar
    September 11th, 2014, 10:28
    Here is a little issue I ran into a little while back starting with the P-40 Warhawk. I had photographs which showed the aircraft with personnel around it. I wanted to use these photographs to determine the wartime aircraft height and ground angle, but had no easy way of doing it. With the BV 141, I have a few photographs of the boarding ladder, but no dimensions for it. Some of these photographs show personnel near the ladder. Here is an attempt to generate a little template to compare. The AF99 part is named "Human.afp" and represents a 6 ft man. The top half was gotten as reference from my ubiquitous pilot figure.
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 11th, 2014, 10:20
    After that little bouncing episode, I realised that I had never actually explored the relationship between the spring rates and the damping factors. I had just arrived through very quick experimentation that a value of between 0.10 X and 0.20 X Spring rate worked pretty well for a combination that settled down very quickly and didn't behave badly. In fact, 0.20 X is about ideal if you were actually building an ideal flight sim aircraft instead of trying to simulate the behaviour of an actual aeroplane. Real aeroplanes often have objectionable behaviour such as a bit too much bounce in the landing gear or a springs that compress so easily that engine torque might cause a ground loop if the wheel track were narrow. Also, on occasion we might want to simulate something other than an...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 8th, 2014, 15:17
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    The military rating for the V-1710-39 was 1150 HP at Sea Level with a Manifold Pressure of 45.5 inches Mercury. In the last releases of this aeroplane, I had not included any War Emergency Power but since then, I have found a manual that does give a WEP rating. In addition, there is the document from Allison which permits up to 60 inches Mercury on the -39 engine. The aircraft manual gives the WEP rating as 1470 HP at Sea Level with MP of 56 inches Mercury. In preparation for tweaking, I first added the WEP change to the AIR file and bumped the critical altitude (I don't this field does anything) down to 12,500 ft. Since it is pretty much impossible to actually test at Sea Level, I run at a minimum altitude of 500 ft for consistency. Generally this means that the engine power will...
    52 replies | 1895 view(s)
  • No Dice's Avatar
    September 7th, 2014, 16:52
    Hello All, I just noticed that we have a new member to the forums, Welcome Nighthawk01 I will let her introduce herself when ready, Be kind guy's... she is new to forums. help her out when possible, much appreciated,
    6 replies | 245 view(s)
  • Ivan's Avatar
    September 7th, 2014, 07:46
    The wobbly bouncing and shivering turned out to be fairly easy to fix. I entered the numbers into my spreadsheets for landing gear parameter calculations and the new numbers were not very different. I changed them anyway. The bounce seemed to get a lot worse. When I entered the dimensions of the aircraft and its weight into the spreadsheet to calculate moments of inertia, I found that the MOI for Pitch from the spreadsheet was much higher than in the AIR file. I entered those and the bounce was gone. Because I had changed the spring rates with the landing gear parameters, the tail wheel was now about 2 inches off the ground. That was obviously a simple fix. In theory, I should enter the new contact points into the spreadsheet to recalculate, but the reality is that these numbers...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 5th, 2014, 18:03
    Thanks Smilo, I also emailed this to Papingo early this afternoon. Lemme know if there is anything you want changed. I can change just about anything as long as it doesn't take too much effort. The 109E is hardly what I would have done with the aircraft, but I believe it was done before AF99. I did some SCASMing to move the V-cockpit viewpoint and also to put the cockpit aft wall in place to hide the tail. The cockpit frame is kinda ugly looking because it isn't textured but at least it shows from the inside. The scaling of the texture files is all kinds of inconsistent which is why I got fancy with some screens on the sand filter. I would never paint a single air filter with an entire texture file which is why I can never do this with one of my own models.
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 5th, 2014, 12:35
    Hello Papingo, Glad to see you back! While some folks mod the heck out of others' work and re-release it. I have never done this before. I have collected quite a few AFX files from many places and modified the heck out of some for my own use. Most of the time, they are for aircraft that I would never build such as the Messerschmitt 109E. It was a great aircraft in its time, but there are many more I would prefer to build. I actually even have some good dimensional drawings for this aircraft if any of you care to try it yourself. Although these other AFXs are others' work, I believe I know enough to make significant improvements and have been doing this for years. In some cases, what I have is better (IMO) than what is publicly available and I have been debating on making...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 3rd, 2014, 17:18
    Hi Smilo, The BV-141 actually isn't as goofy an idea as it appears to be. Hopefully this discussion isn't too long-winded. Especially with Tractor propellers and a little less so with pushers, the spiral slipstream from a turning propeller has a very asymmetric effect on the airframe. The engine torque also produces an opposite effect to the spinning propeller. When the propeller axis is not aligned to the direction of travel as with a tail-dragger on take-off, we also have P-factor. There is also gyroscopic effect when the direction of the aircraft changes which is even less intuitive. The bottom line is that a symmetric aircraft doesn't tend to fly in a symmetric manner. This is why most aircraft have some kind of aerodynamic asymmetry built in. The fin often has an...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 3rd, 2014, 08:53
    Hello All, Here are a few screenshots of a Me 109E originally designed by Richard Osborne. I found the AFX and made quite a few little modifications which hopefully improved the model. I also reworked the pilot a bit. As you can tell, this isn't the same pilot I use on my own aircraft because the current pilot didn't exist at the time I was messing with this project. I think he looks a bit like Adolf Galland which was my original intent. I used this project to test the SCASM processing of a virtual cockpit for which I received notes from Hubbabubba many years back. I thought it would look better than my own aircraft for the v-cockpit because it has an internally viewable canopy frame and my own aeroplanes didn't at the time. I was wondering if anyone thinks this is worthy...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    September 3rd, 2014, 08:45
    Thanks No Dice, This project still needs a bit of work to be closer to current standards even though it has been released before. As with the original, it is competing for shop space with other projects. I think you will like the others though. They are actually much closer to releasable than this one is. All each of the others needs is a decent paint job and I finally believe I have a workable (for me) solution. Near as I can tell, there IS another Blohm & Voss BV 141B series aircraft out there. Here are a couple screenshots of the other aeroplane. - Ivan.
    810 replies | 52082 view(s)
  • No Dice's Avatar
    August 30th, 2014, 11:02
    If you release it, I will make it available to the masses, Dave
    810 replies | 52082 view(s)
  • Ivan's Avatar
    August 30th, 2014, 10:21
    Hello All, The original purpose of this thread was to discuss building aeroplanes that we might expect to see in CFS but surprisingly have not. Here is an aircraft that I built many years back (around 2002 or 2003) for no very good reason. It didn't perform any particularly important duties and in fact was never very common. It was released well over 10 years ago but seems to have disappeared off the downloads list. I have hesitated for a re-release because of a rather silly issue that I did not know how to fix: The animation for the landing gear did not work. It went instantly up or down even though the animation looked fine within Aircraft Animator. Another disconcerting thing was that although the AF99 build would complete and the model LOOKED fine, it would always hit...
    810 replies | 52082 view(s)
  • Ivan's Avatar
    August 26th, 2014, 13:55
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    The front of the landing gear fairings got a bit of a rework to cure a small sparkly where the panels did not overlap. I finished the SCASMing this morning and adjusted the collision bubble. I did some minor texture tweaks this afternoon also. It seems like even some of the references I am using do not agree with photographs. The photographs are guaranteed accurate, but don't show enough detail to get all the major panel lines. Sometimes for animation tests, it helps to have a slow computer so that the transitions don't just flash by. This afternoon, my 10 year old nephew took it for a fighter intercept mission. I believe he was chasing B-17s. The sim remains paused on one of the game machines in the living room. - Ivan.
    52 replies | 1895 view(s)
  • Ivan's Avatar
    August 26th, 2014, 07:41
    I believe it is highly unlikely that a mission will work across different versions. They all tend to be dependent on particular aircraft and scenery which isn't really portable across versions of CFS. - Ivan.
    6 replies | 217 view(s)
  • Ivan's Avatar
    August 23rd, 2014, 07:11
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    The first screenshot shows the main gear struts bleeding through the flaps. Note that the same thing is happening from the far side strut as well. A workable solution in the original model was to add flap parts to the landing gear but as insignia displaying up and aft. When the flaps were reshaped, the insignia flipped to facing forward and down which made them useless. When a couple extra parts were added in other areas and the insignia direction was flipped, the texturing here completely fell apart. I ended up removing the pieces because with the texturing incorrect, it was worse than the bleed it was trying to cover up. The second screenshot shows a couple of the reasons for the extra parts count. The spinner on a P-40 doesn't really come to a sharp point. The end is...
    52 replies | 1895 view(s)
  • Ivan's Avatar
    August 23rd, 2014, 06:50
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    Hi Smilo, That discussion seemed very much ON topic to me. The Hawk 75 is a natural progression when working on the P-40. It seems less and less likely now that I will actually do a P-40Q. It just seems like way too much work and is a hard thing to comtemplate when I have spent the the last few weeks essentially building a new P-40E that looks almost exactly like the original one. I felt I needed to do that to own a really "Good" P-40 which I have always wanted. If I am planning on building more P-40s I needed to have as good a starting point as I can create. Another thing to consider is that just about all of this group of fighters has the same basic wings, stabilizers and fin though the pieces get moved around a bit. With that in mind, hopefully the next Curtiss fighter...
    52 replies | 1895 view(s)
  • Ivan's Avatar
    August 21st, 2014, 13:09
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    Revised the Radiator Exhaust to look more like the real thing. I also found a pretty serious bleed in the nose from an "improvement" I had made. Turns out I usta be a bit smarter than I am now. After removing the bleed, I'll need to adjust the textures on the parts that were reshaped. The remaining screenshot shows the revised wingtip. - Ivan.
    52 replies | 1895 view(s)
  • Ivan's Avatar
    August 20th, 2014, 16:53
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    Hi Smilo, Thanks for the suggestion. Actually I have had a P-36 / Hawk 75 project going for a couple years now. From my line of reasoning, after I had the first P-40E (the current "Warhawk" project), I thought there would not be too many changes to get to a P-40C. It turned out to a LOT of changes to get to a P-40C "Hawk 81" project. (Fewer though than my current revisions to the Warhawk.) From the Hawk 81, it should have been "easy" to get to a Hawk 75 since everyone KNOWS the P-40 was just a P-36 with a new engine. Turns out that there aren't that many shared pieces between the two. Although the general construction is the same, everything was moved around a bit to put the Allison inline in place. The prototype P-37 and P-40 might have been simple engine swaps, but...
    52 replies | 1895 view(s)
  • Ivan's Avatar
    August 20th, 2014, 13:53
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    Hello All, The rebuild is pretty much finished. I am not quite satisfied with the shape of the Radiator Exhaust, so that area will get rebuilt again. Besides that, there are a couple panel lines that need to get moved around a bit after the polygons under them got shifted. In looking at the screenshots, I KNOW that just about everything on this aeroplane got moved around, but the general appearance does not appear to have changed much at all. The shape of the Radiator Intake took a few tries. I finally decided to open a Otaki (?) 1:48 P-40E model kit I had to see how the shapes looked in 3D. I believe I got the shape fairly close to the model. Hopefully it is close to the actual aircraft. The only new obviously new thing is the textured Radiators. - Ivan.
    52 replies | 1895 view(s)
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