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So I personally am unable to properly do an engine run up in this aircraft. Haven't been able to since it was released, and it's a real bummer. The plane creeps at 2300 RPM, and shoots forward when checking for RPM drops. When the ground is a little wet from rain, the plane rolls forward uncontrollably, and accelerates beyond 30 MPH. Someone from A2A, I think it might have been Scott, said this is just one of those limitations with FSX that hold the developers back.

Here's a suggestion I'd like to throw out there though. Take the A2A Accusimmed Spit for example. There's an option available to be able to have a few dudes out there to hold the tail down during the run up.

So would it be possible for the parking brakes to be operated independently from FSX, and completely halt the aircraft during the run up - similar to holding down the tail in the Spitfire?

If the parking brakes cannot be fixed, maybe there is a work around option.

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My Guide On How To Fix Your X-52's Rudder!

That's a brilliant idea. Particularly since you should be motionless when engaging/disengaging the parking brake, anyhow, so you'd never notice anything out of the ordinary...

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+1
I'd like to see some involvement from the ground crew too, sometimes FSX starts you in an awkward corner and as Dudley said tail draggers need forward movement to turn. Watching old Documenteries I see how the ground crew used to turn and push these planes to a possition where they could taxi easily.
I'd like to something like the Cub has to turn it on the ground.

M. Jordan.

Well, I'm not really sure what you mean with the plane "shooting forward" when doing Mag Checks? Can you explain this a bit further?

Creeping is definitely (unfortunately) a limitation of FSX which is not easy to overcome. I never see something else than creeping, with or without chocks, with pedal braking or with parking brake. Wet surface again is something that is limited by FSX and its special way of calculating friction coefficients.

The idea about using ground crew - as used on the Spit - is not comparable. You will never use Ground Crew to HOLD an A/C against its engine power. On the Spit ground crew is solely used to hold the tail down inorder to prevent a prop strike as the elevator force is not enough to keep the tail down at higher engine regimes when the wheels are locked or chocked.

Maybe there is a workaround for the creeping tendency but I'm sure it would have adverse effects on many other items. To a certain degree we have to live with FSX limitations - whether we like it or not. I'm sure A2A will proveide a solution in the mid or long term - but only if we can make sure there are no adverse effects.

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Oskar

i7-2600k OC 4.4 GHz, ASUS P8Z68-V PRO, WIN7-64Bit, 8GB DDR3 1600MHz, 1x OCZ Vertex 120 GB, 1 x OCZ Ibis 480 GB, 1 x GeForce GTX 580, 1200 W Power Supply, 2 monitors, ASE, EFB on remote PC

In a real airplane such as the Mustang, when I did a run up I never used the parking brake and have never recommended using it for run ups. The reason for this is that when doing the run up your head is in the pit on the panel instead of outside the cockpit. If the parking brake fails you might not notice it until you feel it through the aircraft movement and at 2300 RPM that could be enough time to run into something waiting ahead of you in the que.
In the sim I've noticed a strange behavior with the parking brake on the run up. I use the parking brake because I do get creep holding the airplane with the pedals.
With the parking brake what happens is that it's holding just fine through the mag check and during the decrease RPM phase of the governor check, but when I run the prop back on up to full increase the aircraft "creeps forward" about 5 feet then without me touching anything with the brakes settles back in and regains a firm hold. It's weird. Just that small forward movement and it "fixes itself"
All considered, I have no idea what causes it. I just live with it )))))))))))
Dudley

The simple fix for this that anyone can use now is a bit crude, but should elliminate the creeping issue. FSX features function called "freeze latitude and longtitude" - one can simply assign a button or keypress to it and engage it for the runup.

Yeah. Same behavior here. However if you try it when the ground is wet, the plane rolls forward uncontrollably before even reaching 2300 RPM for the mag check.


That sounds like a great temporary fix. Never even knew that feature was there. I'll give it a try.

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My Guide On How To Fix Your X-52's Rudder!

Didn't know about that freeze option, perhaps A2A can utilise it into accu-sim for all aircraft to stop FSX drifting

The freeze command doesn't work all that well.

It seems to only freeze me for 1 second. Even when I am frozen, the plane yaws in-place...probably because of the uneven braking strength. Oh well, it was a good suggestion.

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My Guide On How To Fix Your X-52's Rudder!

I get the same thing, holding the brakes at run-up and checking for prop deficiency (RPM otherwise). At 2300 RPM and moving the Prop Pitch control all the way back, then all the way forward after the RPM needle drops to about 1500. As the RPM climbs back up to full prop pitch the 51' begins to roll though the brakes are fully pressed. As mentioned it does roll about 5 feet but by then I'm already in the threshold of the runway, and I'm pretty sure 51's don't come with the reverse thrust option

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The freeze function locks only latitude and longitude, the aircraft can still change heading (as well as pitch, bank and altitude). I don't have the A2A P-51, but I tried on remotely similar Acceleration Mustang - it creeped a bit at 2300 RPM with brakes engaged, locking coordinates held it in place without any heading change (when I let off the brakes, the heading started to slowly change and wheels started to rotate). I was able to reach about 3100 RPM until tail rose and heading started to change. At this point main wheels were stationary due to brakes, but tailwheel was rotating indicating that if there was no latitude and longitude lock engaged, the plane would be moving as the braking force was not enough to hold it stationary.

Well I'm finding my problem to be my worn brakes mostly. The brakes on my P-51 aren't exactly in like-new condition. I can't even get over 2000 RPM without rolling now.

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My Guide On How To Fix Your X-52's Rudder!