Take Off

[Skewgear]

On 10/13/2022 at 10:15 AM, Michael Taylor said:

Thanks to your reply.  I've addressed your query's inline below. Please feel free to keep the suggestions flowing. There must be something I'm missing if others have mastered it.

• Settings for wind etc, are set to minimal
• Trim settings are all good.
• I've got a split throttle and have tried controlling movement with this method as well, but I get the same result as when I'm using break & rudder control. I haven't given this a lot of time, so will try to master this a little more.
• I've tried every method for the same result. Starting slow and building up to starting at full power. Same result. The smallest adjustment has an exponentially greater effect as the speed increases.
• I've set the mission to have a hot start from the runway, so assuming the tail wheel is straight. I will check. But this shouldn't matter as I should be able to correct this without killing myself.

I'll keep plugging away until I break this beast!

Can you get it airborne off Manston or Beny sur Mer aerodromes? They're the widest runways on their respective maps.

Are you setting takeoff flap? I forgot to mention that before. 15-20 degrees is about right.

The trick with the rudder on the takeoff run is to tap-dance on it: correct any swing the instant it develops and then rapidly return the rudder to neutral. If you press the rudder and leave it there until the next swing, you will lose control. Jabs of brake help with this process.

Do not slam the throttle fully open unless you absolutely need to (obstruction or runway end approaching)

[Art-J]

Mike, post 2 or 3 replay tracks showing your failed takeoff attempts, so that we can take a look at them and advise, otherwise we're running in circles here. There's nothing inherently difficult about Mossie takeoff once you know what to do or rather what not to do. Maybe we'll spot some issue in your approach to the procedure.

[tusler]

Wow seeing the size of this forum on takeoff I don't feel so bad now about crashing the first 22 tries to get it off the ground. LoL

[Migparts]

I do not understand how the boost is achieved. Do I need to rotate the valve which is partly obscured on the left upper of the panel? How do I boost? I never achieve more than about 80 mph during my take off roll and my tail never lifts up. 

[grafspee]

54 minutes ago, Migparts said:

I do not understand how the boost is achieved. Do I need to rotate the valve which is partly obscured on the left upper of the panel? How do I boost? I never achieve more than about 80 mph during my take off roll and my tail never lifts up. 

First you need to move RPM levers all the way forward before attempting take off.

Then you can operate throttle levers.

[Hiob]

1 hour ago, Migparts said:

I do not understand how the boost is achieved. Do I need to rotate the valve which is partly obscured on the left upper of the panel? How do I boost? I never achieve more than about 80 mph during my take off roll and my tail never lifts up. 

Think of a car or a bicycle. You need a short gear ratio aka high rpm to get going. The prop rpm control is like your gearbox in a car. That‘s the reason you need to always adjust the rpm first (high rpm for power needs, lower rpm for efficiency in cruise) and than advance the throttle. Just like a manual gearbox in a car.

[grafspee]

8 hours ago, Hiob said:

That‘s the reason you need to always adjust the rpm first (high rpm for power needs, lower rpm for efficiency in cruise) and than advance the throttle. 

That is not quite true, if you want to increase power first increase rpm after this increase throttle if you want to decrease power things are opposite, first you reduce throttle then you reduce rpm.

Edited March 19 by grafspee

[Hiob]

1 hour ago, grafspee said:

That is not quite true, if you want to increase power first increase rpm after this increase throttle if you want to decrease power things are opposite, first you reduce throttle then you reduce rpm.

 

I was mainly talking about increasing power requirements, hence the "advance" throttle. But you're of course right for decreasing power needs it goes the other way round. Sorry if that wasn't clear from my post. 

[grafspee]

53 minutes ago, Hiob said:

I was mainly talking about increasing power requirements, hence the "advance" throttle. But you're of course right for decreasing power needs it goes the other way round. Sorry if that wasn't clear from my post. 

You used term "always" this could be misleading.

[Hiob]

7 minutes ago, grafspee said:

You used term "always" this could be misleading.

As in "always raise rpm before asking for power"..... but I admit it was poorly phrased.

But I think it is clear now.

[grafspee]

1 hour ago, Hiob said:

As in "always raise rpm before asking for power"..... but I admit it was poorly phrased.

But I think it is clear now.

Good point, it wasn't completely wrong afterall. Sorry about that.

[_Hoss]

I found un-binding my TM Warthog throttles, and using each lever individually for each engine, its much easier to keep it straight on the runway. If I yaw to the left, increase the left throttle a bit and she straightens out. And vice versa...... once airborne, rebind your throttles if you wish.

[Holbeach]

9 minutes ago, _Hoss said:

I found un-binding my TM Warthog throttles, and using each lever individually for each engine, its much easier to keep it straight on the runway. If I yaw to the left, increase the left throttle a bit and she straightens out. And vice versa...... once airborne, rebind your throttles if you wish.

This is axactly how it was done in the real aircraft during the war.

..

[Migparts]

21 hours ago, grafspee said:

First you need to move RPM levers all the way forward before attempting take off.

Then you can operate throttle levers.

Yes that is how I do it. Yet achieving 100 mph is almost impossible and it is just too slow to take off. I end up crashing as a car would at the end of the runway. 

[Hiob]

4 minutes ago, Migparts said:

Yes that is how I do it. Yet achieving 100 mph is almost impossible and it is just too slow to take off. I end up crashing as a car would at the end of the runway. 

Brakes are complete loose? Too much flaps perhaps? (Don’t know if Mosquito takes full flaps on TO). Mixture settings?

Maybe make a little track for us to have a look.

 

[grafspee]

1 hour ago, Migparts said:

Yes that is how I do it. Yet achieving 100 mph is almost impossible and it is just too slow to take off. I end up crashing as a car would at the end of the runway. 

I'm not aware of length of all airstrips in DCS maybe you are trying to take off from very short runway ? Can you tell us from which airport are you trying take off ? 

I tried on my end and i am able to get even 140 before liftoff, question is how long is runway from which you are trying to take off because some of them are quite short for mosquito.

Edited March 19 by grafspee

[Art-J]

Other option - the last time I've read about such symptoms in Mossie, user had game flight mode turned on.

[Bozon]

Last time this “lack of takeoff power” happened to me the reason was that RPM dropped to minimum - I had two axes mapped to RPM (by mistake), one on the throttle and one on the stick base, so when I advanced one the inputs were conflicting. RPM lever would advance to max, but then jump back to minimum when I was not looking.

[Migparts]

The thing that enabled me to actually take off in the Mosquito is the elevator trim down.