Electrical actuated systems working before turning battery on

[Pribs86]

Cowl flaps, intercooler, and oil cooler work a little bit with engine off before turning battery power on then stop working. Then once battery is on they don't move anymore. Haven't checked any other electrical items yet though. Wasn't sure if this was a bug or the way the A/C was designed. The P-51 and P-47 need the battery on to operate all of these and when the battery is off they don't actuate.

 

Thanks!

[Rudel_chw]

at least the cowl flaps are operated hydraulically, not electric. the hydraulic system includes an accumulator so you have a bit of hydro pressure available at cold start, but will deplete fairly quickly 

 

you can employ the manual hydraulic pump at your left, to build up more pressure 

 

 

[Pribs86]

1 hour ago, Rudel_chw said:

at least the cowl flaps are operated hydraulically, not electric. the hydraulic system includes an accumulator so you have a bit of hydro pressure available at cold start, but will deplete fairly quickly 

 

you can employ the manual hydraulic pump at your left, to build up more pressure 

 

 

Oh damn, gotcha! Thought they were electrical operated. Makes sense that they work for a bit then stop (residual hydraulic pressure). I'm used to the P-47 I guess. Good catch. Thanks!

Edited Monday at 06:34 PM by Pribs86

[Rudel_chw]

21 minutes ago, Pribs86 said:

Oh damn, gotcha! Thought they were electrical operated. Makes sense that they work for a bit then stop (residual hydraulic pressure). I'm used to the P-47 I guess. Good catch. Thanks!

 

the corsair has a lot of systems that employ hydraulic power: the landing gear, flaps, wing fold, cannon arming, and the cowl flaps, all of them can operate for a bit with the engine not yet running, until the accumulator depletes.  I haven't flown the p47 recently, so cannot really compare the two

 

 

Edited Monday at 06:50 PM by Rudel_chw

[Pribs86]

2 minutes ago, Rudel_chw said:

 

the corsair has a lot of systems that employ hydraulic power: the landing gear, flaps, wing fold, cannon arming, and the cowl flaps, all of them can operate for a bit with the engine not yet running, until the accumulator depletes. I haven't flown the p47 recently, so cannot really compare the two

 

 

Thanks for pointing that out. I appreciate it. Yeah the P-47s cowl flaps, oil and intercooler doors are all electric so it was a huge assumption on my part. I'll stick with reading the manual before assuming next time.

Have an awesome day. Thanks again!

[Rudel_chw]

Just now, Pribs86 said:

I'll stick with reading the manual before assuming next time.

 

 Here is a diagram of the Hydraulic System of the F4U:

[Pribs86]

On 6/23/2025 at 1:51 PM, Rudel_chw said:

 

 Here is a diagram of the Hydraulic System of the F4U:

AWESOME FIND!! Thank you!