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Old 08-08-2014, 02:45 AM   #1
wolle
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Default How to Land the Dora

I have a couple of questions:

When I take-off it doesn't seem to make a difference whether I hold back the stick when I start rolling. Theoretically holding back the stick should lock the tail wheel and keep the plane straight. I cannot detect any difference whether I hold the stick back or not, in both cases the plane yaws drastically as soon as I release the brake. When I look at it from F2 view, the tail wheel is initially straight. As soon as I start to roll, whether or not I hold the stick back, the plane yaws to the right, and the tail wheel rotates with it. The effect of holding the stick back seems to take effect only after a second or so. After a second or so, the tail wheel indeed locks, but at that point you are already off-course.

Has anyone tried crosswind take-offs (say 10 m/s). I can do those fine with the P51, but the Dora seems to be blown all over the place by the crosswind. Strangely it wants to weather vane with the wind, instead of into it (which I think is the usual response) Any tips?

During landing approach, as soon as you lower flaps and gear, the plane becomes extremely nose-heavy. I have to trim her all the way and in addition pull the stick back almost all the way just to keep a proper approach attitude.
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Old 08-08-2014, 05:42 AM   #2
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Maybe post a track, people can help you better if they can see what you are doing.
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Old 08-08-2014, 08:08 AM   #3
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Quote:
Originally Posted by wolle View Post
I have a couple of questions:

When I take-off it doesn't seem to make a difference whether I hold back the stick when I start rolling. Theoretically holding back the stick should lock the tail wheel and keep the plane straight. I cannot detect any difference whether I hold the stick back or not, in both cases the plane yaws drastically as soon as I release the brake. When I look at it from F2 view, the tail wheel is initially straight. As soon as I start to roll, whether or not I hold the stick back, the plane yaws to the right, and the tail wheel rotates with it. The effect of holding the stick back seems to take effect only after a second or so. After a second or so, the tail wheel indeed locks, but at that point you are already off-course.

Has anyone tried crosswind take-offs (say 10 m/s). I can do those fine with the P51, but the Dora seems to be blown all over the place by the crosswind. Strangely it wants to weather vane with the wind, instead of into it (which I think is the usual response) Any tips?

During landing approach, as soon as you lower flaps and gear, the plane becomes extremely nose-heavy. I have to trim her all the way and in addition pull the stick back almost all the way just to keep a proper approach attitude.

Give her full power insantly to start its not like slowly increase power in the pony.
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Old 08-08-2014, 03:06 PM   #4
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Originally Posted by Isegrim View Post
Give her full power insantly to start its not like slowly increase power in the pony.
I do this already, both for the P51 and the Dora. Hold wheel brakes, increase to as much RPM as the wheel brakes can take. Then release them, and increase throttle to full RPM smoothly but quickly (within a fraction of a second).

My questions were not so much that I can't take off in the Dora (I can), but I think there are still problems with the flight model, when it comes to tail wheel locking and cross wind aerodynamic behavior when taking off (try taking off with 10 m/s crosswind and you'll see what I mean). I have to give it full aileron into the wind, full throttle, full rudder, full toe brakes just to keep her aligned, and even then it's a wobbly dance at best.

I am also doubtful that the landings should require so much pull on the flight stick in addition to full elevator trim. Would be nice to know whether these things are still work in progress, or if the Dora really behaved like that.
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Old 08-08-2014, 03:40 PM   #5
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Quote:
Originally Posted by wolle View Post
I do this already, both for the P51 and the Dora. Hold wheel brakes, increase to as much RPM as the wheel brakes can take. Then release them, and increase throttle to full RPM smoothly but quickly (within a fraction of a second).

My questions were not so much that I can't take off in the Dora (I can), but I think there are still problems with the flight model, when it comes to tail wheel locking and cross wind aerodynamic behavior when taking off (try taking off with 10 m/s crosswind and you'll see what I mean). I have to give it full aileron into the wind, full throttle, full rudder, full toe brakes just to keep her aligned, and even then it's a wobbly dance at best.

I am also doubtful that the landings should require so much pull on the flight stick in addition to full elevator trim. Would be nice to know whether these things are still work in progress, or if the Dora really behaved like that.
If you are in doubt what is the reason of your takeoff problems - turn on 100% TO assistance. Then apply rudder slowly only maintaining general direction of rolling. If it helps - the reason is not in FM.
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Old 08-08-2014, 03:44 PM   #6
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Originally Posted by Yo-Yo View Post
If you are in doubt what is the reason of your takeoff problems - turn on 100% TO assistance. Then apply rudder slowly only maintaining general direction of rolling. If it helps - the reason is not in FM.
Well Yo-Yo, actually for me, turning OFF takeoff assist made things a lot more manageable / plausible.

I can perfectly takeoff and land the Dora, but it was more difficult / unplausible? when I had Takeoff Assist at 100% and wasn't aware of that...
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Old 08-08-2014, 04:31 PM   #7
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Well Yo-Yo, actually for me, turning OFF takeoff assist made things a lot more manageable / plausible.

I can perfectly takeoff and land the Dora, but it was more difficult / unplausible? when I had Takeoff Assist at 100% and wasn't aware of that...
I guess your fighting was dramatic...
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Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
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Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
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Old 10-05-2015, 04:48 PM   #8
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Originally Posted by Isegrim View Post
Give her full power insantly to start its not like slowly increase power in the pony.
You can't give full power immediately in a tail wheel aircraft and you shouldn't.
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Old 10-05-2015, 06:17 PM   #9
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You can't give full power immediately in a tail wheel aircraft and you shouldn't.
Erich Brunotte told me that he used not to add power gradually and it has sense because it gives more rudder power at the start. Moreover, he told that the guys who did not - they had troubles at start.
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Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
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Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
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Old 10-05-2015, 06:57 PM   #10
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Originally Posted by Yo-Yo View Post
Erich Brunotte told me that he used not to add power gradually and it has sense because it gives more rudder power at the start. Moreover, he told that the guys who did not - they had troubles at start.
Erich told me the same also when I had the pleasure of meeting him.

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