Can't get full throttle?

[Proxyjack]

For whatever reason, I am trying to do run up with a C-172S and it just will not throttle past 1500 RPM when I max throttle to 100%. This makes take offs impossible and throttle at idle causing complete engine shutdown. I can't get past the run up without this being an issue.

Throttle is 100%
Magnetos are set to both
Fuel Selector Both

[Lavenders2]

Do you have spoilers/airbrake up? Do you have flaps down at all? Any screenshots? Hard to say what the issue is but my first guess would be spoilers/airbrakes/flaps.
What are you using to throttle up?

[Maki Nishikino]

Hover your mouse over the throttle, does it say 100%?

[Proxyjack]

C172-S doesn't have spoilers or airbrakes and yes flaps are up. Apparently as I just found the issue, the game really doesn't like mixture rich and pulls out all power from the engine even though you should be mixture rich below 3000. For throttle up I've been using a Thrustmaster Hotas and in game Click and 100% throttle.

[Proxyjack]

Originally posted by Maki Nishikino:

Hover your mouse over the throttle, does it say 100%?

Bro, read the post.

[Maki Nishikino]

Originally posted by Proxyjack:

Originally posted by Maki Nishikino:

Hover your mouse over the throttle, does it say 100%?

Bro, read the post.

I was going to suggest leaning your mixture. Even so 1500 RPM is awfully low even with a full rich mixture no matter the field elevation.

EDIT: What airport is this? At KLXV with an elevation of ~9900 feet with the clear weather preset selected I'm getting bang on 1500 RPM with the mixture at 93% and throttle set at 100%. If I move my mouse wheel up one click on the mixture from that the engine quits. I would just wait for A2A to roll in.

[Proxyjack]

Originally posted by Maki Nishikino:

Originally posted by Proxyjack:

Bro, read the post.

I was going to suggest leaning your mixture. Even so 1500 RPM is awfully low even with a full rich mixture no matter the field elevation.

EDIT: What airport is this? At KLXV with an elevation of ~9900 feet with the clear weather preset selected I'm getting bang on 1500 RPM with the mixture at 93% and throttle set at 100%. If I move my mouse wheel up one click on the mixture from that the engine quits. I would just wait for A2A to roll in.

KAPA. It's bizarre. All my checklists for real flight and in game all say mixture rich. Figured it out, so thank you.

[Maki Nishikino]

Originally posted by Proxyjack:

Originally posted by Maki Nishikino:

I was going to suggest leaning your mixture. Even so 1500 RPM is awfully low even with a full rich mixture no matter the field elevation.

EDIT: What airport is this? At KLXV with an elevation of ~9900 feet with the clear weather preset selected I'm getting bang on 1500 RPM with the mixture at 93% and throttle set at 100%. If I move my mouse wheel up one click on the mixture from that the engine quits. I would just wait for A2A to roll in.

KAPA. It's bizarre. All my checklists for real flight and in game all say mixture rich. Figured it out, so thank you.

You do full rich in reality at that airport? In reality if I was there in a 172 I would lean to get max RPM before takeoff.

[Proxyjack]

If my checklist weren't classified I'd show you. Its what the school taught as we always went full mixture.

[HoloByteus]

Originally posted by Proxyjack:

C172-S doesn't have spoilers or airbrakes and yes flaps are up. Apparently as I just found the issue, the game really doesn't like mixture rich and pulls out all power from the engine even though you should be mixture rich below 3000. For throttle up I've been using a Thrustmaster Hotas and in game Click and 100% throttle.

What's your ground elevation? If you're at say Colorado Springs which is 6000ft on the ground you'll need to lean it out for full power, it doesn't take much.

[Twelvefield]

For that matter, I seem to get full power at 85% rather than 100% at sea level.

[Maki Nishikino]

I went in P3D and threw the 172S prop on at KAPA, I saw 2200 RPM full-rich and about 2250 leaned.

[Twelvefield]

I just tried the G1000 172 in MSFS' KAPA. I had no problem with getting 2000+ RPM and touch-and-gos. Full rich of course does put too much fuel into the mixture, but even cutting back to 85% as I mentioned above was okay. The mixture seemed the best at 55%.

I also have the Thrustmaster HOTAS and I used 3D cockpit controls for the mixture. Not sure where OP's problem lies.

KAPA is a nice airport!

[Maki Nishikino]

Originally posted by Twelvefield:

Not sure where OP's problem lies.

The RPM they're getting on the runup (which the manual / checklist does say to use a full rich mixture). The mags are checked at 1800 RPM, they're only getting 1500 RPM. I was able to pull more than what was needed when I hopped in P3D. For the actual takeoff the manual / checklist does state that if you're above 3000 feet you lean to obtain max RPM but for the runup you have the mixture set to full rich.

[Twelvefield]

I understand that. I was unable to replicate the issue, though. That's the part I don't get. The only way to get down to 1500 RPM was to cut the throttle or lean the mixture lower than 20%. Even at full rich, I had enough power for take-off although it would not be optimal.

[Maki Nishikino]

I started on the runway and the mixture was leaned when I spawned, at full power I got 2250 RPM (the same as in P3D with it leaned). Full power and full rich mixture got me 1530 RPM (in P3D I got 2200 RPM). Keep in mind that the issue is with the runup, not the takeoff (which you do lean) and can get 2250 RPM. When you check your mags it's done at 1800 RPM, you can't get this much at KAPA with a full rich mixture. OP I suggest just skipping the runup till A2A aircraft come and just lean for max power on takeoff. You shouldn't be stuck at ~1500 RPM with a leaned mixture, this happens with it at full rich.

You can also try this...

https://www.nexusmods.com/microsoftflightsimulator/mods/370