Make Planes Spin and Snap

[filtr]

Hi Folks

I am try to make the planes spin or snap. They do not snap that great. Is there a way to make them do it the right way

[peterpennisi]

I have posted a similar request some time again without any replies. I have hoped that someone would have an answer.

Let's hope that someone has a answer.

My guess is that we have found a limitation in the program. The physics calculations used for these manouvers may not be up to it.
??? ??? ??? ???

[nikolaou]

Try to experiment a little bit (if you have'nt done so) with the axial movement parameters:
Line Num.5 Maximim Aileron Angle
Line Num.22 Roll Inertia Moment
Of course from what I've concluded the program is really good but it lack some fine details about realism in flight.

Anyway this is a pretty good (by my standards) .par file, just put those in your (low-wing) plane


Example of .par

0 1:Type(-) Type[0=Plane] ParDesigner Ver0.8
15 2:Tmax(N) Maximum Thrust
0.30 3:Drmax(rad) Maximun Rudder Angle
0.10 4:Demax(rad) Maxmim Elevator Angle
0.020 5:Damax(rad) Maximim Aileron Angle
1.0 6:CLmax(-) Maximum Lift Coefficient
-1.0 7:CLmin(-) Minimum Lift Coefficient
6.3 8:CLa(/rad) Lift Gradient
10 9:CLaSt(/rad) Lift Gradient in Stall
0.02 10:CDw(-) Drag Coefficient of Wing
0.04 11:CDb(-) Drag Coefficient of Fuselage
0.2 12:mug(-) Friction Coefficient of Wheels
0.69 13:dCDSt(-) Rise of Drag Coefficient in Stall
0.00 14:CM(-) Moment Coefficient
0.015 15:alpha0(rad) Wing Angle
1.48 16:b(m) Wing Span
0.23 17:c(m) Wing Chord
0.10 18:hce(m) Equivalent Center of Gravity
1.5 19:m(Kg) Mass
0.18 20:Izz(Kg*m^2) Yaw Inertia Moment
0.024 21:Iyy(Kg*m^2) Pitch Inertia Moment
0.010 22:Ixx(Kg*m^2) Roll Inertia Moment
0.05 23:She(m^2) Effective Area of Stab
0.06 24:Sfe(m^2) Effective Area of fin
0.70 25:Lt(m) Tail Moment Arm
0.001 26:VForm(-) Effect of Dihedral Angle

Regards,
Christos

[falcon]

I found a model called Phase 6 and added electric power and sound. One of the best flying models I have downloaded, that rolls fast and has realistic rudder response. Spins are also possible but do not use full rudder deflection. Study the par file and the settings in relation to the size of the model. Control surface travel, centre of gravity and inertia settings seem to provide well balanced settings.Phase 6 is a sailplane model designed by Chris Foss.
The drawings for FMS made:
Georg Gerdes, FRG, gerdes-rantrum@t-online.de

The .par-File is by:
Matt Carlton, U.K.
matt@carltons.freeserve.co.uk

[Rockfist Rogan]

OK...
I found and d/l *Phase 6* at :

It's in the *new*section, at the bottom of the page.
(An excellent site, with many models... )

Now tell me/us how to add electric and sound please


RR

[falcon]

RR,
To add power to Phase 6 - edit par file to include:
8(N) Maximum Thrust. Then copy the .wav file from any electric power model you prefer into the phase six directory.

The thrust setting will not allow take-off from the runway. Hand launch the model with full power, or winch launch then use the throttle. I hope this helps.

[Rockfist Rogan]

Ok, I managed that without a problem. Thank you!
Before that though, as I find it very nose heavy, I shifted the CG back to 0.14, which at least enables a hand launch without it nosediving into the ground!
It now glides much better, I think. However this is clearly nonsense as it now puts the balance point at 70% of the chord, so there would appear to be other factors coming into play here. I need to understand what they are!

I ask because if I (eventually!) get my head round getting my own designs to *fly* with FMS, I would have presumed that I would need to put *true* (ie derived from the model) figures into the par file?

If this IS really the case, it makes FMS a wondeful design aid...

RR

[Looee]

[Rockfist Rogan]

Yes, I agree with this.
However...something is not right here if you need to go back to 50%.
In real life, and VERY generally speaking, most conventionally shaped) models will need a balance point of between 25% and 33%.
The furthest back I have ever set a balance point (on a real model) was around 45%, and this was an old A2 glider with a very pronounced camber.
I just checked my 2 metre electric glider, with an E205 section, and it is is balanced at 31%.
There's nothing wrong with the glide at that setting...I got a 35 minute flight out of it yesterday afternoon

RR