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  • Ivan's Avatar
    Today, 19:30
    Hello Papingo, I was curious about flying from Midway because of its SMALL size. It is hard to believe that so much was expended fighting over such a tiny little bunch of islands. I was reading a book that pointed out the silliness and lack of worthwhile objectives in this battle that I thought I would go "experience it firsthand" with some Wildcats and Zeros. - Ivan.
    4 replies | 124 view(s)
  • No Dice's Avatar
    Today, 07:21
    Have a great one: :birthday: Dave
    6 replies | 90 view(s)
  • Ivan's Avatar
    Yesterday, 15:03
    Thanks Hubbabubba, I will go look for it. - Ivan.
    4 replies | 124 view(s)
  • hubbabubba's Avatar
    January 27th, 2015, 23:04
    Yep Ivan, midway-full-cfs.zip at FlightSim. Just copy/paste in their search engine.
    4 replies | 124 view(s)
  • Ivan's Avatar
    January 27th, 2015, 18:15
    Does anyone know if there is a readily available downloadable scenery fo Midway and surrounding islands in the Pacific Ocean? Thanks. - Ivan.
    4 replies | 124 view(s)
  • No Dice's Avatar
    January 25th, 2015, 07:00
    If you are looking to place macros into scenery, scroll down to the scenery section here: http://www.thefreeflightsite.com/Design.htm Dave
    5 replies | 153 view(s)
  • Ivan's Avatar
    January 24th, 2015, 22:34
    Hello Aleatorylamp. I am only just beginning to Visualise the inter relationships myself. I had almost gotten this far with earlier spreadsheets before my laptop computer died. I am actually getting better results with the current spreadsheet because The earlier one had some kind of formula error I still cannot figure out. Tonight I started working on the actual problem that had me interested in the Propeller Tables and found that I need to create a couple more spreadsheets to poke around at Engine Power and Constant Speed Propellers. There are at least 4 projects that could use some tuning in this area. Don't be concerned about needing to be an aeronautical engineer to understand this stuff. I most certainly am not one myself. Then again, there is always the question of...
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 23rd, 2015, 16:50
    Hello Aleatorylamp, Actually increasing AR 0.6 to try to affect the in-between AR 0.5 value is a workable idea, but the problem is that Advance Ratio 0.5 is 115 MPH True Air Speed, and your Giant will probably not see it much. Perhaps I am over simplifying. Your Giant MAY see Advance Ratios higher than 0.4 but if it does, the visits will be very transient and encountered at very low RPM such as at Take-Off or Landing. At full engine RPM and level flight, the Giant should not even see AR 0.4 which is 92 mph, but it might come close. - Ivan.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 22nd, 2015, 20:28
    Hello Aleatorylamp, Please go back to post #980. Note that the Giant should never exceed AR of 0.4 in level flight and is more likely to be around 0.25 in a climb. That is why only the 0.0, 0.2 and 0.4 entries were tuned in Record 512 in the AIR file I sent you. The same entries in Record 511 are all that are really important as well. You might want to adjust the other entries to make a smooth transition, but it isn't absolutely essential because your aeroplane won't be seeing 138 mph TAS much if at all. Glad you are having fun! - Ivan.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 21st, 2015, 09:35
    I believe that just because you don't have a DP doesn't mean you are not carrying around ammunition. The default DP file is used in that case and it has 2 x 20 mm cannon and 4 x .303 cal MGs. For a service ceiling test, I typically use 50% Fuel + about 15 gallons and full ammunition. The extra fuel is so that the ceiling is reached with just a bit over 50% fuel. If the fuel runs slightly lower, I don't worry about it, but the remaining fuel quantity is always noted in the test record so I can better reproduce it if I need to. As for your test weight for the Giant Zeppelin, use whatever the weight specified in your reference says. Just keep in mind that they probably didn't use full power during the time to height test. Most likely is "Climb Power" (Surprise!) or the 30 minute...
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 21st, 2015, 09:18
    Hello Aleatorylamp Here is a thread worth browsing that might give some detail as to how I calculate the Zero Fuel Weight that I use in the AIR file: http://www.sim-outhouse.com/sohforums/showthread.php?84748-Focke-Wulf-190A-Revisited Posts 5 and 7 are probably the most relevant. I suspect you will be able to better on some of the reference material than I was. My German is mediocre at best. The Zero Fuel Weight in CFS is a "Normal Loaded Weight" but with Empty Fuel Tanks - No Explanation Necessary
    1000 replies | 60730 view(s)
  • No Dice's Avatar
    January 20th, 2015, 18:52
    Please stay strong sir, She will be always caring for you........just look for the light. It will come and you will see it. Dave
    30 replies | 782 view(s)
  • Ivan's Avatar
    January 20th, 2015, 15:52
    Hello Aleatorylamp, You might need to back off a bit with the Propeller Efficiency entries. Propellers back in the days of the Great War were not particularly efficient. Even during WW2 and today, a really good Propeller wont get much higher than 85% efficiency at best and then only in a VERY narrow optimum operating range. Typically this would be at Cruising speeds. I don't believe that 14 foot piece of timber would ever exceed 75% efficiency and I doubt it woul really get that high considering the very low advance ratios it would be operating in. Also, you are really trying to boost the mid range thrust for climbing instead of thrust at maximum level speed. - Ivan.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 20th, 2015, 08:19
    Hello Aleatorylamp, Combat Flight Simulator works a bit differently that Flight Simulator 98 in that the Gun Ammunition and Bomb Load Weights are specified in the DP file. Also, when selecting the aircraft, you can change the default bomb and ammunition loads. For defaults, I typically use full Gun Ammunition and Zero Bomb Load with the expectation that the Aircraft Commander (Player) will select the appropriate load for the mission. You can of course select a maximum bomb load and only partial fuel to stay under MTOW. [ Ivan.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 19th, 2015, 22:16
    The correct power is 267 HP, not 276 HP, Right? Also, is the climb rate with or without bomb load? What is the flying weight for these tests? If you send me your Giant Aeroplane again, I will see if I can improve the climb rate a bit. - Ivan.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 19th, 2015, 13:38
    The Climb Performance is only going to get a LOT worse with the new 14 foot propellers. First enable the autopilot if you haven't already. Send me your current AIR file. I might be able to help tune a few things as long as you are otherwise satisfied with the handling. I am guessing with your time to altitude that your initial climb is going to be closer to 300 or 350 feet per minute or maybe even higher considering that power will drop off at altitude with an un supercharged engine. I take it we are still going for 225 HP at Sea Level and 267 HP at 4300 feet with a maximum speed of 84 mph at 4300 feet? I presume service ceiling is 100 feet per minute? This is the part I really hate because it involves sitting there with a stopwatch.
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 19th, 2015, 08:16
    Hello Aleatorylamp, I have some good news and some bad news for you. First, the Good News: My mechanics found an old German wood worker who claims to have actually flown during the Great War. He helped us out a bit with the glue formulas and a bit on the carving and now we have a serviceable though not necessarily optimal 14 foot propeller for the Giant Zeppelin. It survived flight testing fine but my mechanics didn't spend the time polishing or contouring the blades beyond what was absolutely necessary for the test flights. Next, The BAD News: The reason why my initial tries at the Big Wooden Propeller didn't work is because I did not take into account the HUGE change in Advance Ratio with a change from 8 feet to 14 feet in propeller diameter. It is proportional as you...
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 19th, 2015, 07:50
    Hello Papingo, Glad to see you again. I believe Aleatorylamp's posts might always be using the same colour font and do not adjust to the display scheme. I use the SOH default (Light Blue / White) so everything looks fine. Those selections are on the lower left of your screen if you scroll all the way down. I was also working on DP files for the Lightning before this Big Zeppelin Engine diversion. It seems like a worthwhile diversion because I believe I actually learned quite a lot in doing this project and some of that new knowledge will most likely transfer to other projects. What kind of Aeroplane is your DP file for? I have collected a fair amount of data on WW2 Aircraft Guns that might be helpful to you. If it is something like the Big Zeppelin, I won't be as much help...
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 17th, 2015, 16:26
    My folks are having a great deal of difficulty working in Laminated Wood. The first try ended up as a mess of splinters but they have no idea why things didn't work. I would suggest that your guys go ahead and mount the Zeppelin Engine they received. It will at least give them an idea of the general level of flight performance and handling they can expect and perhaps there is other tuning that they may wish to do. My guys put a low pitch stop at 25 degrees, but if your fellows are working with the engine, they may want to remove that stop and even trim down the propeller blades some more so that the engine possibly choose either a coarser or finer pitch than 25 degrees. In that way, they can get a real measure of the engine power curves which my mechanics didn't do. My mechanics...
    1000 replies | 60730 view(s)
  • Ivan's Avatar
    January 17th, 2015, 11:45
    Hello Aleatorylamp, The Big Zeppelin Engine has finally finished bench testing. Next step is to fit a big wooden propeller to it and see how it works in hauling around a Giant Aeroplane. Things pretty much worked out as I expected with tuning the Friction and Torque curves. Friction is not changed much from the stock P-51D other than adjustment of the maximum RPM, Interesting thing is that I forgot to do this for the Eindecker but it didn't seem to have much effect. We NEEDED some fine tuning here to put in the "Big" drop in torque at around 1300 RPM. I employ some pretty good aircraft mechanics in my workshop and although I am not always sure what they are doing, they like to prove themselves by always tuning their engines for a couple horsepower over the specifications or...
    1000 replies | 60730 view(s)
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About hubbabubba

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