Hi Heiko,
interesting link.
I think I have to improve the rotor simulation to cover rotors with
different airfoils along the blade.
But first we need the drag/lift curves for these airfoils. My short
search at the web was not successful.
I am a little bit surprised, that the ec135 uses the same airfoil than
the tiger. Several years ago a eurocopter test pilot of the tiger told
me, that the tiger is nearly not capable to autorotate. It's not
impossible, but he told it's rather sporty and it's not unlikely to
damage the helicopter. I think they want to avoid overspeed of the rotor
at extreme flight attitudes and therefore the rotor does not speed up in
autorotation. This is in agreement with his statement, that it is not
possible to damage the tiger while in flight.
But I expect the ec135 to be able to autorotate. Maybe the twisting is
different? (But I heard, that the enignes would be damaged, if you train
autorotation, and therefore the ec135 for the german Heeresflieger
("army") got a modification to be capable to train autorotation).
Maik
Heiko Schulz schrieb:
> Hi,
>
> I hope to finish the helicopter soon- you see, there
> is some work to do.
>
> I used Google and found this wonderful site - maybe
> interesting for the wiki:
> www.ae.uiuc.edu/m-selig/ads/aircraft.html -->"The
> Incomplete Guide to Airfoil Usage"
>
> For the EC 135 I found out that the EC 135 uses the
> DFVLR DM-H3 inboard and DFLVR DM-H4 outboard - the
> same than the Tiger uses.
> Maybe it helps a little bit.
>
> Greetings
> HHS
>
> --- Maik Justus <[EMAIL PROTECTED]> schrieb:
>
>
>> Hi Heiko,
>> I am happy to hear of a new heli for flightgear. Of
>> course I try to help
>> modeling the parameters for the FDM. Enclosed you
>> can find a very first
>> trial. (Fortunately I have done this a few weeks
>> ago. I hope I will get
>> feedback from experienced ec135 pilots quite soon to
>> optimize the
>> parameters to fit the real heli.) But up to now I do
>> not have the
>> airfoils, therfore I use the naca23012 with small
>> modifications to meet
>> the performance of the ec135. (Up to now I did not
>> try very hard to
>> achieve the overall performance like climb speed or
>> maximum speed. My
>> first aim is to achieve realistic dynamic behavior,
>> and if this is done
>> I will try to do the rest.)
>>
>> Best regards,
>> Maik
>>
>>
>>
>> Heiko Schulz schrieb:
>>
>>> Hi at all,
>>>
>>> While I'm working on a ASK 21 glider, I began to
>>>
>> model
>>
>>> the Eurocopter Ec 135.
>>>
>>> The exterior model is up to 50-60% ready, the
>>>
>> interior
>>
>>> model still 0% but in few days it goes with this
>>>
>> on.
>>
>>> @Maik: I hope you read this - is there any chance
>>>
>> to
>>
>>> get a flightmodel for the Ec 135? I got some
>>> perfomance data, found on the Euocopter Homepage
>>>
>> and a
>>
>>> hint for the airfoil.
>>>
>>> Greetings to all
>>> HHS
>>>
>>> Picture:
>>>
>>> www.hoerbird.de/bilder/ec135.prototype.jpg
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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