Tweaking an older model for more accurate performance (and new 2D panel from a photo). Proceeding well except the plane easily surpasses its stated ceiling. It is also too fast at sea level. But so far anything i try to correct these two parameters also screws up the rest of the flight envelope.
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The Staff of SOH
Ceiling too high
- Thread starter jgf
- Start date
What sim and which aircraft?
FS2004 of course, lol. Aircraft is an experimental WWII fighter; there are several models available, mostly for CFS and FS2000. The best, IMO, is for FS2004, but the creator built any prop driven aircraft on a turboprop model, so this has turbo gauges, a thrust control, etc. (you may recognize who from this alone). I wanted the correct radial engine with proper gauges and controls.
Started this project a dozen years ago but quickly found I didn't know enough about air files so backburnered it. Discovered this buried on an HD a couple of years ago and started fresh. Main thing I learned is not to try and copy different engine parameters from one air file to another ...that's a nasty can of worms. Copy the entire air file to your aircraft then edit the flight parameters in the donor file to match the cfg file. Design ceiling was 39k ft (which I think is a bit optimistic), plane easily achieves that, in fact it would probably go to 44k-45k ft with no problem. Top speed was estimated 480mph at 28k ft, which it does, but sea level top speed should be only around 320mph, which it exceeds by nearly 100mph (not strictly sea level, I ran it at 1000ft). I've played around with drag figures, supercharger parameters, prop thrust, etc.
Started this project a dozen years ago but quickly found I didn't know enough about air files so backburnered it. Discovered this buried on an HD a couple of years ago and started fresh. Main thing I learned is not to try and copy different engine parameters from one air file to another ...that's a nasty can of worms. Copy the entire air file to your aircraft then edit the flight parameters in the donor file to match the cfg file. Design ceiling was 39k ft (which I think is a bit optimistic), plane easily achieves that, in fact it would probably go to 44k-45k ft with no problem. Top speed was estimated 480mph at 28k ft, which it does, but sea level top speed should be only around 320mph, which it exceeds by nearly 100mph (not strictly sea level, I ran it at 1000ft). I've played around with drag figures, supercharger parameters, prop thrust, etc.
This sounds like an 'Ito' project to me. 
Have you used any of Jerry Beckwith's tools before, they might help you out.
This thread has some good info too ..........
As does this ..........
Jerry made the 'Air Wrench' program discussed in the post above which was payware but has since gone freeware I believe (if you can find it). I have the paid version from years ago.
Have you used any of Jerry Beckwith's tools before, they might help you out.
This thread has some good info too ..........
How to begin?
Dumb question time. If starting from scratch, and not using Air Wrench, how do you start a new air file? What program creates an “*.air” file? Also, there are so many variables inside an air file, where do you get such data? I have an original copy of a “North American Aviation Estimated...
sim-outhouse.org
As does this ..........
What Key info is need to create an FDE?
This information has been mentioned numerous times in many threads, the data numbers for weight, engine HP, airfoil, and etc. What (if when creating flight dynamics) is the optimal info to have on hand if available?
sim-outhouse.org
Jerry made the 'Air Wrench' program discussed in the post above which was payware but has since gone freeware I believe (if you can find it). I have the paid version from years ago.
I use AAM, aired, and AFSD for most work. Know nothing of Excel so that would be a learning experience in itself. This was my first project involving changing the type of engine.
Yes, this is one of Mr Ito's creations (I didn't want to call names, lol). He did beautiful work, but I always wondered about his use of turboprops for anything with a propeller. And his panels were often rather generic; in fact my first photopanel was done for his Rockwell T2C nearly twenty years ago (he sent a PM on flightsim complimenting it ... my head probably swelled a couple of sizes). Sadly, I believe he is no longer with us.
Yes, this is one of Mr Ito's creations (I didn't want to call names, lol). He did beautiful work, but I always wondered about his use of turboprops for anything with a propeller. And his panels were often rather generic; in fact my first photopanel was done for his Rockwell T2C nearly twenty years ago (he sent a PM on flightsim complimenting it ... my head probably swelled a couple of sizes). Sadly, I believe he is no longer with us.