Blow-Up Flaps Not Blowing Up

[Saxman]

Per the Vought manual, the first two notches of flaps on the F4U are designed to blow-up automatically under air pressure if you exceed a certain speed, (I believe it's 250kts IAS) and then redeploy automatically again once you fall under critical speed.

However last night I entered a power-on dive with two notches of flaps extended, and even though I cleared that speed the flaps were never blown up again.

[-Rudel-]

Please provide a track and/or recorded video

[Saxman]

Track uploaded to Dropbox here.

There's also some general speed test stuff at the beginning. The flaps are at the end. Dive from about 20,000ft with flaps on the 20 degree (2nd) notch.

Airspeed cleared 400kts on the dive, and at the end I still had to manually retract the flaps (it's possible it might have blown up from 20 degrees to 10 degrees on its own, (or I just missed the second notch and only had 10 degrees from the start) but I DEFINITELY had to retract the 10 degree notch manually, which should not have been the case.

Edited July 3 by Saxman

[Spurts]

I experience the opposite problem, if anything.  I try and deploy full flaps for landing but they blow up to 30-40.

[felixx75]

4 hours ago, Spurts said:

I experience the opposite problem, if anything.  I try and deploy full flaps for landing but they blow up to 30-40.

What speed do you fly the final approach at?

[Spurts]

On 7/5/2025 at 2:05 AM, felixx75 said:

What speed do you fly the final approach at?

between 90-100KIAS, trending towards 90 before touchdown