Author Topic: Throttle and RPM  (Read 736 times)

Offline crowbaby

  • Copper Member
  • **
  • Posts: 223
Throttle and RPM
« on: January 26, 2003, 07:37:00 AM »
This is not a post about using your throttle in combat. I hope everyone is doing that :). This is about your plane weighing more than it needs to, and running out of fuel before you can RTB. It won't radically change the way you fly, but it might just give you an edge. This advice is not much use for 'furballers' but great for 'cherry-pickers'. It's also useful for anyone doing long range penetration or escort missions.
 
It has come up in another thread that a lot of pilots are flying around with their Throttle and RPM maxed out all of the time. While AH allows you to do this (presumably to make life bearable for those who don't have a HOTAS), it's not the best way to fly a plane.

If you throttle off and reduce RPM a little while in safe airspace, you'll still get a reasonable speed, often at a huge reduction in fuel consumption. This can mean as much as double time aloft for some of the longer legged American fighters for a reduction of maybe 75mph in airspeed. This means you can carry less weight of fuel (and therefore maneuvre better), or even just make it home sometimes when you wouldn't otherwise - albeit at a slower speed.

If this seems like a lot of effort for a little gain, well, the same could be said of the rudder. It's a sim, and it's up to you how you want to fly it.

I've linked a few sources of pilot's docs which can be used as rough guidelines. There is still debate about the accuracy of HTC's modelling of fuel consumption, but there is no doubt that you will get more efficient use of your fuel in AH if you throttle back and reduce RPM.

Flight charts for U.S. iron at Zeno's
(bottom right 'More neat Stuff')
Spitfire mkXIV pilot's notes
Mosquito FB.6 - Edited Pilots notes
Yak-3 in Russian
(may be relevant for Yak-9s)  
Bf109 manuals
Early P-40 manual
There is a lot more stuff out there, for example, somewhere there's a site with 4 or 5 diff. Spit manuals, but i've lost all of my links.

Offline akak

  • Silver Member
  • ****
  • Posts: 986
      • http://www.479thraiders.com
Throttle and RPM
« Reply #1 on: January 26, 2003, 07:34:32 PM »
The only things I've never adjusted in AH have been the auto-fuel settings and RPM.  With the size of the majority of the maps and with most fights within a sector of take off, fuel conservation isn't all that much of an issue, at least for me.  If I want longer to stay and loiter for awhile over the target area of have a to fly a considerable distance away, I just take either 1 or 2 drop tanks.  



Ack-Ack

Offline Blagard

  • Nickel Member
  • ***
  • Posts: 731
Throttle and RPM
« Reply #2 on: February 01, 2003, 12:05:13 PM »
For Non-RPM users please note if you run out of fuel (leaking tank or just plain not watching it!) you can glide considerably further by feathering the prop! i.e. reduce RPM setting as low as you can.

I have got back to base many times this way. Additionally as the glide is so improved I find winding the RPM back to max on landing helps like an airbrake otherwise you may actually float the length of the runway and off the end!

Cheers
Blagard

PS try it in flight by shutting the engine down and set auto climb for the glide. Watch the difference as you play with RPM settings

Offline akak

  • Silver Member
  • ****
  • Posts: 986
      • http://www.479thraiders.com
Throttle and RPM
« Reply #3 on: February 02, 2003, 03:58:32 PM »
Quote
Originally posted by Blagard
For Non-RPM users please note if you run out of fuel (leaking tank or just plain not watching it!) you can glide considerably further by feathering the prop! i.e. reduce RPM setting as low as you can.

I have got back to base many times this way. Additionally as the glide is so improved I find winding the RPM back to max on landing helps like an airbrake otherwise you may actually float the length of the runway and off the end!

Cheers
Blagard

PS try it in flight by shutting the engine down and set auto climb for the glide. Watch the difference as you play with RPM settings


When your engine dies from lack of fuel starvation or battle damage, the props are automatically feathered.  It is only when you turn off the engines manually that you have to lower the RPM to feather the props.


ack-ack

Offline crowbaby

  • Copper Member
  • **
  • Posts: 223
Throttle and RPM
« Reply #4 on: February 02, 2003, 04:44:02 PM »
I believe it is only the planes that could feather props historically, (i.e. multi-engined planes) which auto-feather dead engines in AH.