• Ivan's Avatar
    Yesterday, 17:38
    Earlier this evening I ran just one simple test of the Mitchell. The earlier version was able to reach 310 MPH at 15,000 feet. The new version only gets to 301 MPH at 15,000 feet. The results were a bit surprising and tell me there is more work necessary. There are some interesting explanations for the unexpected results; They have to do with the fact that the propeller tables are discrete points rather than continuous curves and the interpolation would sometimes arrive at slightly different results than one would expect from a smooth curve.
    127 replies | 3618 view(s)
  • Ivan's Avatar
    Yesterday, 11:50
    Hello Aleatorylamp, I am glad you are happy with the results. If you had already done a lot of tuning to your AIR file, the only real changes in mine were Record 505 - Supercharger Boost Gain, Manifold Pressure Limits Record 508 - Engine Torque versus RPM Record 509 - Per Cylinder Friction Loss versus RPM. There were no other changes, so if you just copy these Records over to your AIR file, you have all the changes.
    127 replies | 3618 view(s)
  • No Dice's Avatar
    Yesterday, 09:49
    Update to the Original Viet Olds Mission: Updated Viet_Olds Mission The Viet-Olds1 mission is intended to upgrade the original Viet_Olds mission by allowing full use of the enhanced Bar Le Railyard scenery (here) ,Flak has been relocated, AA guns have been added along with additional mission only scenery. Can be used as a stand alone or replacement of the original mission. http://www.thefreeflightsite.com/Vietnam_Projects_2.htm
    528 replies | 43640 view(s)
  • No Dice's Avatar
    Yesterday, 09:46
    Congrats my friend, looks like a second honey moon may be in the works for tonight. Dave
    528 replies | 43640 view(s)
  • No Dice's Avatar
    Yesterday, 07:44
    Good Luck John, Hope the closing on your new house goes smooth as silk for you today, Dave
    528 replies | 43640 view(s)
  • Ivan's Avatar
    May 26th, 2016, 20:53
    Hello Aleatorylamp, I did a fair amount of poking around yesterday with engine parameters of the Mitchell. First issue was that the last full engine test was done and documented 30. Nov 2008. (Yes, the project is that old!) It was on version 0.53. I looked around a bit and confirmed that my current version is 0.58 modified in Jun 2013. I also found that I was really building a generic "Early B-25 with no specific actual model.
    127 replies | 3618 view(s)
  • hubbabubba's Avatar
    May 26th, 2016, 11:21
    I had the same issue. Try this link; http://mobile.wnd.com/2016/05/bill-gates-of-hell-windows-10-hijacks-computers/?cat_orig=us The original link was for an email newsletter and need that app to open. This one was "resolved" to its http:// original address.
    16 replies | 615 view(s)
  • hubbabubba's Avatar
    May 25th, 2016, 14:08
    I'm under W7 on all my main PC and have no intention of letting M$ infect... sorry... "upgrade" me to Win 10, but this is turning into a constant fight. I had to turn down the automatic updating and watch carefully what was proposed, strangely ranging from important to optional depending on the machine. The now (in)famous KB3035583 has tried to get installed four times despite being duly masked. Other, like KB3150513, do try to go by with the good-old-lame-and-anonymous "Windows Update for XYZ" that says nothing. I'm really feeling like that guy in California that was spraying right and left, perched on his roof, with his garden hose, trying to stop the raging flames of the incoming forest fire from getting a foothold. I think he finally succeeded, I'm not sure I will.:banghead:
    16 replies | 615 view(s)
  • Ivan's Avatar
    May 23rd, 2016, 15:44
    Hello Aleatorylamp, My point wasn't that our mechanics could not blueprint a couple good engines. These guys and sometimes gals are amazing. The point was that these engines may not have been as tolerant of maximum power operation as some others. As I commented earlier, the Nakajima Sakae and their equivalent for the Japanese Army were quite durable engines and tolerated over boosting quite well to the point that this fact was noted by the enemy who warned their own pilots. In other words, maximum power / WEP for the R-2600 SHOULD be limited in some way. So.... With that in mind: WEP is 44.0 inches Maximum Continuous is 39.0 inches
    127 replies | 3618 view(s)
  • No Dice's Avatar
    May 23rd, 2016, 15:17
    Thank you All, Just got back home. John, I am looking forward to seeing the 47's, Dave
    528 replies | 43640 view(s)
  • Ivan's Avatar
    May 22nd, 2016, 14:22
    Hello Aleatorylamp, The Japanese fighter I was describing was the Kawasaki Ki-61 Hien (Allied code name Tony). Its prototypes had Daimler Benz DB 601Aa engines but production models used the Japanese Kawasaki Ha-40 engine which was generally poorly made. It is the project I am using to work on propeller tables and so far the Warhawks have prevented me from going back to finish. The fairly simple camouflage scheme also has me stuck. You are quite correct: The flight model for the Ki-61 reflects an ideal version of the engine instead of one with all the problems of the typical example. Regarding the Baltimore and the Mitchell, My version of the R-2600-13 does not have WEP but also does not give Take-Off power at Sea Level. At 15,000 feet, WEP and normal full power are the same so...
    127 replies | 3618 view(s)
  • Ivan's Avatar
    May 22nd, 2016, 09:12
    Hello Aleatorylamp, My interpretation on this bit of history is that the Take-Off / WEP was not really useable for much beyond getting an overloaded bomber off the ground. I am re-thinking the use of WEP for achieving maximum level speeds. At altitude, it does not matter because there isn't any effect but perhaps it wasn't available for a sea level sprint either. It also sounds like the problems were never resolved during the production run of the Baltimore and probably not of any of the Mitchells before late 1944. Certainly the B-25C Mitchell would have had the same issues so perhaps I should rework it for lower power. Regarding engine problems with the A6M Type Zero, I don't recall that there really were any functioning problems at all, especially with the A6M2 which had very...
    127 replies | 3618 view(s)
  • Ivan's Avatar
    May 21st, 2016, 22:14
    http://www.enginehistory.org/Wright/R-2600/R-2600CaseHx.shtml Here is a little history that sheds some not so favourable light on the Wright R-2600 engine. Perhaps I should also revise my B-25C AIR File to restrict power settings a bit as well. I also found a manual on the Cyclone 14 Model C14A. - Ivan.
    127 replies | 3618 view(s)
  • Ivan's Avatar
    May 21st, 2016, 20:19
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    The P-40N didn't have the greatest problems with WEP at altitude; The P-40K and P-40E were quite a bit worse. The P-40K also has a new visual model which may the excuse for an updated release. In playing with the P-40N, it just did not look right without a shark mouth, so the last couple evenings were spent in repainting the cowl to put a shark Mouth there. - Ivan.
    208 replies | 16339 view(s)
  • No Dice's Avatar
    May 19th, 2016, 16:11
    Thanks Bob and Allen, Bob watch out , I will be returning to NJ in a week or two to help out my Uncle. I may have time to look you up, would be great to meet you in person, But I insist on buying the cold ones....I can run up quite a tab. Check back with ya'll Tuesday,
    528 replies | 43640 view(s)
  • Ivan's Avatar
    May 18th, 2016, 19:19
    Ivan replied to a thread Warhawk in CFS1 General Discussion
    It seems like CFS Superchargers have a bit more capability than I had thought. Aleatorylamp came across an interesting supercharger power reduction by adjusting a parameter identified as WEP Pressure Change Rate (0.528 or Zero) This parameter apparently works as modifier to the SuperCharger Boost Gain parameter. If set to Zero, there is no additional power when using WEP above the critical altitude. By doing this, the high altitude WEP effect which was causing problems is gone. Unfortunately, the testing also showed that the parameters which were modified to allow knife-edge flight affected lateral stability and control in a very unfavourable way so until I can compensate in the AIR file this feature will not be included.
    208 replies | 16339 view(s)
  • No Dice's Avatar
    May 18th, 2016, 16:54
    Sorry to be so late Allen, I had a family member pass and have been trying to coordinate flights from Biloxi to AC New Jersey etc... She passed on the 13th and seems like everyday following is still the bad luck day. I have only been able to take a quick look, but as usual of your work she is a beauty, Thank you so much. I will be leaving friday and return monday night. Please do not think I am Ignoring anyone, All of yall's contributions will be posted as soon as I return. Thank you all one more time for your additions and help on this project.
    528 replies | 43640 view(s)
  • Ivan's Avatar
    May 16th, 2016, 19:41
    Up until a week or so ago, I was certain that the implementation of Superchargers in Combat Flight Simulator was incorrect. There are two factors in the implementation that appeared to be less than ideal: The first is that only Single Speed Superchargers are simulated. With a multi-speed supercharger, there are shift points. With a two speed supercharger, the Low gear is engaged at low altitude. At sea level, it supplies all the boost that the engine is capable of handling. As altitude increases, the Low speed supercharger is less able to provide full boost and power drops.... ....Until at a predetermined altitude, the supercharger shifts to High gear.
    36 replies | 2354 view(s)
  • Ivan's Avatar
    May 16th, 2016, 18:49
    The problem with doing a tutorial and the reason I am generally quite reluctant to actually do one is because they are generally monologues with no sanity checks of any kind. They hopefully represent the best information the author has at the time. Very seldom do more knowledgeable people critique or comment when the information being presented is outright incorrect. Occasionally, we learn new things as time goes on. This tutorial is no exception. Regarding ways to simulate Exhaust Thrust, I had listed the following: 1. Decrease Airframe Drag. 2. Increase Engine Power.
    36 replies | 2354 view(s)
  • No Dice's Avatar
    May 16th, 2016, 18:19
    I come right behind Ya'll, Damn....Thanks Allen, I try to spot them, got backed up today, Happy Birthday Sir, :birthday: Hope it was the best ever, Dave
    9 replies | 210 view(s)
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