Blenheim take off

[meplay]

Hi Seeker, the only thing i do is basically have my right engine throttle at 100% and left at around 50% and as my back wheel starts to come up i set the left engine to 100% also. The main thing that stops me from overheating though is when ive started to roll quit fast, i start to drop the prop pitch slowly till its about half way or lower and thats seem to be the only thing that stop my CHT from sky rocketing through the roof.

[Trumper]

Watch the use of the throttles, happens in real life
http://www.fightercontrol.co.uk/foru...p?f=18&t=20608

[JG53Frankyboy]

Originally Posted by meplay

Hi Seeker, the only thing i do is basically have my right engine throttle at 100% and left at around 50% and as my back wheel starts to come up i set the left engine to 100% also. The main thing that stops me from overheating though is when ive started to roll quit fast, i start to drop the prop pitch slowly till its about half way or lower and thats seem to be the only thing that stop my CHT from sky rocketing through the roof.

i just repeat myself, WHEN you warm up the engines to 200°C (NO joke!) , the engines work simultan when opening the throttles. No need to make on 50% and the other 100% than. It just take time to reach this temperature without speeding up the game...

CoD need a "warm engines" setting, RoF players know what i am talking about

[meplay]

Originally Posted by JG53Frankyboy

i just repeat myself, WHEN you warm up the engines to 200°C (NO joke!) , the engines work simultan when opening the throttles. No need to make on 50% and the other 100% than. It just take time to reach this temperature without speeding up the game...

CoD need a "warm engines" setting, RoF players know what i am talking about

yup i only put the left 1 at 50% throttle to stop it pulling off the runway to the right. then when i get rudder authority il (ie when tail is off ground) il set the left engine to full, i use prop pitch to stop CHT going above 250

I shoulda really said that ive already got my oil temp to 40 and my CHT to 200 by the time im ready for takeoff

[JG53Frankyboy]

you checked the ruddertrim ?
because as default it is full right IIRC.....

[meplay]

Originally Posted by JG53Frankyboy

you checked the ruddertrim ?
because as default it is full right IIRC.....

yeah i put it full left rudder at start of mission, still pulls over :/ i cant stop it unless i have my left engine to 50% and right to 100% throttle, even when i turn the cross wind to zero. on one of my own missions on the channel map.

[Sternjaeger II]

lol I don't remember where I was, but it was a little airshow and a girl was commenting on a turn on/warm up engine checklist that she spotted in a cockpit: she said something like "hey, get temperature to 200 degrees, it's like a recipe!" much to the amusement of the people around her hehehe

[Blackdog_kt]

Originally Posted by meplay

Hi Seeker, the only thing i do is basically have my right engine throttle at 100% and left at around 50% and as my back wheel starts to come up i set the left engine to 100% also. The main thing that stops me from overheating though is when ive started to roll quit fast, i start to drop the prop pitch slowly till its about half way or lower and thats seem to be the only thing that stop my CHT from sky rocketing through the roof.

Actually setting prop pitch to 50% has no effect. It uses two-stage props like the Spit.MkI but the sliders don't "snap" into the top and bottom position like they should. If you set pitch full back it goes to the low RPM position, if you set it at anything higher than that it's the same as running it full fine.

Which means that running with the slider at 50% has no real effect, you can take-off just fine with it at 100% and save yourself some trouble


As for the temperatures now, i too had a bit of trouble. I could take-off just fine with an accelerated warm-up if i'm not carrying bombs, i would advance the throttles in a series of steps with the brakes on in order to "force" a temp increase. When they are running rough the aircraft shakes, when the shaking stops you know it's sufficiently warmed up for the current boost setting so you push it up a notch or two.

However, i would only get the CHT (cylinder head temp) to 150 or so and upon trying to take-off with a bombload bad things would happen. If its unloaded you get enough acceleration and rudder authority even with the engines running slightly rough, but if it's loaded the acceleration is slower, airflow is less and engine components start to fail.

My most recent trick is frequent use of the cowl flaps to actively control CHT. This is also really critical during descent and approach/landing. You can't just chop the throttle and start descending at high speed, the engines will go cold and by the time you deploy gear and flaps and need the extra power for the flare and touchdown you don't get any.

In fact, the entire profile of the approach (how low can you set boost and how fast you can go in combination with your cowl flaps and prop pitch setting) is determined by keeping the temps where they need to be.

If you just put the nose down at coarse pitch (which will cause you to accelerate even further) and chop the throttle you're about to suffer.

Instead, chop the throttles first and go to fine pitch (high RPM), this combination makes the props windmill almost face-on to the incoming airflow and acts like an airbrake. Then start closing cowl flaps (i had them at about 30%-40% and it was still resulting in too low CHT), but remember to open them again when you re-apply throttle to settle into the glide slope.

Yes, it's difficult and the ergonomics in the cockpit are not really the best, but it's highly realistic. Similar things happen with most radial engines, you can take a look on youtube at the A2A P-47 for FSX, or even better, search for some videos showing DeHavilland Beaver aircraft in Canada or Alaska starting up their wasp junior engine.

Radials need some pretty intensive temp management, this workload is the trade-off for their reliability, power and combat resilience.

[bob_baer]

Why the rpm doesn't modify changing the mixture? and also changing altitudes it doesn't seem the mixture change is needed. Is it a bug?

[Seeker]

Originally Posted by bob_baer

Why the rpm doesn't modify changing the mixture? and also changing altitudes it doesn't seem the mixture change is needed. Is it a bug?

Why do you think it should?

It's true that an incorrect mixture setting will have an effect on the RPM's achievable, but one wouldn't normally mess with the mixture to suit differing engine speeds.