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Re: [Paparazzi-devel] Electrical connections in the airborne equipment.


From: antoine drouin
Subject: Re: [Paparazzi-devel] Electrical connections in the airborne equipment.
Date: Tue, 13 Jul 2010 14:39:58 +0200

what you are trying to fight with the aileron->rudder mixing is adverse yaw

http://en.wikipedia.org/wiki/Adverse_yaw

Regards

Poine

On Tue, Jul 13, 2010 at 2:30 PM, Felix Ruess <address@hidden> wrote:
> Yes, I guess you would want to do that in a more sophisticated way.
> But currently there is no extra yaw control and since we had the
> rudder already connected it is probably better to mix it in a little
> on the roll command than not using it at all.
>
> Felix
>
> On Tue, Jul 13, 2010 at 11:44 AM, Maik Höpfel <address@hidden> wrote:
>> I always wonder about that. I can see why mixing it with the roll
>> angle would be helpful (to prevent it to falling "into" the center of
>> curve), but why mix it with ailerons? Shouldn't you use the rudder
>> trough the entire duration of a curve?
>>
>> - Maik
>>
>> 2010/7/13 Felix Ruess <address@hidden>:
>>> I mix the rudder in with the ailerons, probably helps but is not needed.
>>>
>>> Felix
>>>
>>> On Tue, Jul 13, 2010 at 10:56 AM, Maik Höpfel <address@hidden> wrote:
>>>> We just left the rudder servo on our TwinStar disconnected because we were
>>>> wary of high currents. I don't use the rudder while flying and neither does
>>>> Paparazzi. Note that the rudder is also understood as a failsafe if the
>>>> ailerons stop working, but it's not very hard to land a plane with only one
>>>> aileron working too.
>>>>
>>>> Regards,
>>>> Maik
>>>>
>>>> Am 13.07.2010 10:08 schrieb "Helge Walle" <address@hidden>:
>>>>
>>>> Thanks a lot for the useful advice Poine,
>>>>
>>>> Since everything is already installed I think I'll try the current setup on
>>>> my TwinstarII where the TWOG powers the servos. I will alter the 
>>>> connections
>>>> if I detect any of the problems described in this topic. I'll use a hight
>>>> altitude for the first Auto flights. I am planning a new plane a little bit
>>>> larger than the TwinstarII. On this I will power the servos separately from
>>>> the BEC.
>>>>
>>>> About the ppm board. My understanding of it is as follows. The TWOG needs
>>>> the complete pulse train for all servos in one input signal. To get this,
>>>> I opened my first 35MHz reiceiver and connected to a point where the signal
>>>> was not "demultiplexed" to each servo output. This is very well described 
>>>> in
>>>> the wiki. On my new 2.4GHz receiver this not so easily done. I have
>>>> therefore connected each servo output that is in use to the  inputs on the
>>>> ppm board with short servo leads soldered directly to the board. The board
>>>> then produces the pulse train I collected from the 35MHz receiver. I
>>>> understand there are also some overlap issues between servo signals on the
>>>> 2.4GHz receiver, but this is taken care of by the ppm board.
>>>>
>>>> Regards,
>>>> Helge.
>>>>
>>>>
>>>>
>>>> 2010/7/13 antoine drouin <address@hidden>
>>>>
>>>>>
>>>>> Hi Helge
>>>>>
>>>>> We know for experience that 4 micro servos on the twog supply, on a
>>>>> not too fast...
>>>>
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