SOH P-61 project

***warchild*** · August 22nd, 2010, 00:06

Originally Posted by rohan

Pam,
I'm not sure whether this was just a mistype, but I think my elementary physics taught me that acceleration due to Earth's gravity was around 32 ft / sec / sec ...

Hope that helps,
Ro

err ummm.. did i mention i was dyslexic??? :;blush:: sorry, your correct.. my brain transposed the numbers.. it wasnt a typo, just a thinking error..

***warchild*** · August 22nd, 2010, 00:31

Was just thinking.. The radar on board gave you five miles if visibility. Not much compared to todays standards, but plenty to let you take action, and if you could get an opponent into a turning fight, you could pretty much own him.. Also, using rudders would increase the roll rate. I dont know if that would increase its survivability against an FW190 or a zero, but it would certainly help to even the odds with a lot of other planes.

***warchild*** · August 22nd, 2010, 14:02

The CL variables for the flaps are much better.. Its still not dropping quite enough but that can be changed by raising the airspeed weight factor..
I had to raise the prop MOI to 489 slugs because anything below 250 slugs and the engine dies. 489 propels us through 310 mph and gives us a good climb rate..

***stansdds*** · August 22nd, 2010, 14:48

That's the flight manual I have.

**fliger747** · August 22nd, 2010, 21:55

The engines only die on startup without a bit of throttle, idle them for a short bit at 1000 RPM like you are supposed to (preventing plug fouling) and then thery idle just fine down to 600 RPM or so. Several other ways to do this include changing the shape of the shaft friction vrs RPM table (509) or the mechanical friction at low RPM scalar in the .cfg file.

I think the way they were setup is about right as one needed to feed a bit more throttle to these engines on initial start till they warmed a bit and the mixture settled down, especially as they were started on prime.

Just back from a very long flight Dubai, Frnakfurt, Dubai. Sun is up and another scorcher in the offing!

Cheers: T

This table is 509, controls internal friction vrs RPM, can be used to tune the engine HP somewhat along the power curve.

***warchild*** · August 23rd, 2010, 04:25

I like the idea: A LOT.. This is definaterly one of those planes that you really need to have a relationship wit to fully appreciate her.. But the wall i'm running into on my system is that the sim is loading in with dead engines.. The 489 slugs also was taken from my calculations of the MOI for the prop, so i chose to use it.. Indeed, i love having to know a bit of what i'm doing in the cockpit, or a car or anything I drive, but we cant unleash a product on the public that starts with the engines not running.
We may need a systems engineer to work with us on this, but, maybe we can calculate out the real world MOI for the prop ( in case i made an error ) and reverse engineer the rest of the drive train back through each part to make it perform realistically as we would like for it too??? i know its extra work, but with as far as youve gotten with the FDE this last week, we're way ahead of the others, and i'll be free for a few days very very soon so i can jump in with you on that..
If you and i can keep finding ways to use the differences we have between us and capitalize on those, i know were gonna be able to built a fantastic plane.. I know its not easy, we're both classic type A personalities, but so far: my gods just look where we're at..

PS.. Glad you made it home safe

You must be exhasted.. Hope you get some down time and some rest..

**fliger747** · August 23rd, 2010, 10:27

No... Still in Dubai, heading over to Shanghai in the AM, another day and then home for a short bit.

BTW the engines start and keep running fine if you give them a bit of throttle for warmup, just like the real deal. The other way to do this is to reduce the internal friction at idle a bit. I can do this but it is possible to end up with the SP2 guys with an engine that turns after shutdown. Not all FSX is created the same.

I am sure this will turn out quite well. Might be able to get to load the current model when I get to ZSPD (Shanghai).

Cheers: T

***warchild*** · August 23rd, 2010, 11:06

Originally Posted by fliger747

No... Still in Dubai, heading over to Shanghai in the AM, another day and then home for a short bit.

BTW the engines start and keep running fine if you give them a bit of throttle for warmup, just like the real deal. The other way to do this is to reduce the internal friction at idle a bit. I can do this but it is possible to end up with the SP2 guys with an engine that turns after shutdown. Not all FSX is created the same.

I am sure this will turn out quite well. Might be able to get to load the current model when I get to ZSPD (Shanghai).

Cheers: T

Current model has no animations.. We're waiting on input from crashaz. it'd probably be best to hang on for a bit before downloading the latest version because of the lack of animations..

The thing with starting it up though, is that no one should have to start it if they dont want too. If they want too, thats another thing, but with accel it doesnt start, and i'm afraid that 89 slugs is just not realistic either..
Forgive me, i'm in a lot of pain today and its distracting and tiring, lets make this thing, but lets make it right.. your so close as is. its just a matter of adjusting values.. we can do this, and its worth the risks.. I mean, so what if we hit a roadblock and have to find our way around it??

As for SP2, i'm aware of that, but i'm willing to risk it. I'm running accel myself, which is different than Sp2 as you know, but we can work with it.. If the problem arises for them, then we'll have a copy of this config we can use in creating a fix specific to them..

**fliger747** · August 23rd, 2010, 18:03

Interesting as it is already running when I load.... and stays running. The only issue I have is starting cold that it needs a bit of throttle, could try increasing the minimum MP. I will experiment a bit with this.

Cheers: T

**fliger747** · August 23rd, 2010, 18:16

I changed the min MP from 9 to 10 and reduced the low RPM cyl friction (tbl 509) and they stay running without advancing the throttle..... Will experiment a bit more with this.

T

***N2056*** · August 23rd, 2010, 18:42

Meanwhile at the instrument panel...
Can someone tell me if the needle on this compass should be magnetic or gyro driven?

Attachment 16510

**fliger747** · August 23rd, 2010, 18:48

Still fiddling but it "works". The propeller MOI shouldn't be too important as mostly it affects the rate of rpm change, speed of engine start and wind down (opposing internal starter torque and internal friction). Does not really affect thrust values too much as they hide in the prop tables.

Very small adjustments affect the idle value and whether or not the engine keeps running. This is of course all for Accel.

Blasting off for Shanghai soon, so probably not time to "jet" you a new FDE.

Cheers: T

**fliger747** · August 23rd, 2010, 18:54

Not the final word, but generally the early RMI compass cards repeated a remote compass, but the heading on the rotating card was set with the knob to a desired value and did not automatically reflect the heading of the aircraft. I might have some ancient WWII pilot training manuals that could shed the light on this setup, but of course they are at home and I am still about 12 time zones away.

There might be some folks here who do have the info at their fingertips, or can find it sooner!

Looking good: T

***N2056*** · August 23rd, 2010, 19:30

I'm pretty certain it's not magnetic...but then wouldn't it be susceptible to drift? I can't find a whiskey compass anywhere in the real plane that you could compare it to

**fliger747** · August 23rd, 2010, 19:34

Probably used a remote flux gate and was slaved to that, but yet there should be a whisky compass somewhere. Can't have a directly magnetic verticle needle.....

Keep up the great work! t