Search found 24 matches: c172p floats

Return to: Cessna 172P detailed (was "Cockpit textures for the c172p")

Re: Cessna 172P detailed (was "Cockpit textures for the c172

Just a side note to the C172 devel team and users of it - a friend of mine has an instagram account where you will likely see (among other things) a familiar aircraft and livery - the OH-CTL on floats, one of the inspirations for the whole idea to put the c172p on floats, and to make other bush plane options and the 180hp engine.

https://instagram.com/escapistpilot/

-Tuomas
by tigert
Thu May 30, 2019 8:41 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

Thanks, I figured it out, I think. I had added my Flightgear 3.4.0 aircraft to the Flightgear 2016.2.1 menu so it showed like 5 versions of the c172p (3d,2d,IFR and canvas or some such). Once I unlinked the 3.4.0 aircraft the floats showed up. Both aircraft had the same name but different locations (c172p-set.xml). I haven't checked the flaps but I can work that out if need be.
by Pitchfire
Sun May 29, 2016 4:34 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

Some observations from me:

When using he original "non-detailed" version that came with FG 3.4 download: anyone using bigger wheels/floats on the detailed version over MP appears to float in the air, because the old version doesn't have these sub-models.
Image

When using the "3.2 regression-version" on Mac OS X 10.10.2 Yosemite, running FG3.4 I get this as a panel:
Image

I say panel, rather than instrument panel because most of the instruments are missing from the panel. This is with the downloaded folder renamed as "c172p" and moved into the app itself. i.e.: /Applications/FG/FlightGear.app/Contents/Resources/data/Aircraft/c172p/

Maybe this problem is specific to my particular set-up, or maybe that the detailed version is really meant for those with >= FG3.5. Whatever, I'm sorry to have to say that this looks like a non-starter for me. Not to worry, the old one isn't that bad :)
by Warty
Thu Jun 25, 2015 8:51 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

Fossilized float plane wake, for ONOX:

Image

I'm guessing one of us left this wake milliseconds before he crashed; the plane disappeared but the wake remained. I was apparently the only one to see it (I feel so privileged!). There was no animation, hence "fossilized."

Other c172p-detailed observations from today's Impromptu Alaska Cessna Free-for-all and Pool Party:

1. The old c172p has bent wings, no wheels or gear struts, and unblinking wingtip strobes, when seen over MP by a 172-detailed pilot. The REPAIR button does not help.

2. Other 172s seen over MP have the same shadow as the viewer's model--e.g., if my plane has floats and yours has wheels, I'll see your wheels but your shadow will include my floats. Also, your shadow will have the same vertical relation to your plane as mine has with my plane, stuck to your wheels if I'm on the ground, even if you're 1000' in the air.

3. Roostertail wakes look really, really cool when seen from 200' above.

4. Watching each other land on the water is not amusing. It's hilarious. Fortunately, every FG pilot is a good sport.

5. FG 3.5 still has the bug that causes MP and AI aircraft to disappear when viewed from certain narrow angles.

6. wkitty's 172 has a bed in the back. Further, deponent saith not. ;)
by someguy
Thu Jun 25, 2015 12:16 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

So, I downloaded the latest 3.2 "regression-version" as suggested. First thing I noted was that I couldn't obviously tell the difference. So I loaded up the old one to compare:
Image

These look the same to me, so I edited Aircraft/c172p-detailed-regression-version-to-3.2/c172p-set.xml at line 71as follows:

Code: Select all
  <model>
    <!--path archive="y">Aircraft/c172p/Models/c172p.xml</path-->
    <path archive="y">Aircraft/c172p-detailed-regression-version-to-3.2/Models/c172p.xml</path>
   

which gave me this:
Image
. . . which is an improvement. But there is still obviously something wrong! Any suggestions ??

EDIT: swapping this line also gives some improvements over the one I downloaded:
1: ALS shadow can now be selected (though it floats at about wing-level)
2: A pilot can now be selected (human models check box)
3: different wheels can now be selected.
by Warty
Wed Jun 24, 2015 1:46 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

MIG29pilot wrote in Tue Jun 23, 2015 7:57 pm:Those contributors must be nuts, if they think taking off in twenty foot high bumps and bounces is "just right!"


That's not what my take-offs or landings look like.

Like most other manoeuvres in flying a take off on floats requires somewhat proper technique, which for the c172p model in FG is maintaining a slight back-pressure on the yoke throughout the take off run to keep the top of the glare shield at or slightly above the horizon.
While this might not be exactly what a real c172p seaplane pilot does you can be certain that he/she does pay close attention to the pitch attitude during the take off run and would certainly not take off stick free or with the elevator stuck at 0 deflection (the latter being "stick free" in FG).

To reiterate a signature from the Flying Boat Forum: "In water flying attitude is everything." :)
by AndersG
Tue Jun 23, 2015 8:27 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

AndersG wrote in Tue Jun 16, 2015 11:45 am:...one could change the -3.0 deg offset in the component computing hydro/float/pitch-deg in Systems/c172p-hydrodynamics.xml to see if the angle of the floats matters.

I cancelled the value (to 0.0 instead of -3.0) but the difference is not quite obvious. The main problem is at touching the water. And a very slight roll angle makes the aircraft violently bounce from one float to the other. Easily up to upside down.
(I do my landings between 45 and 50 KIAS, full flaps (default load, engine at idle.). More mild with a bit of throttle, I don't know if it is the way IRL.
by dany93
Tue Jun 16, 2015 12:54 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

dany93 wrote in Tue Jun 16, 2015 10:24 am:
AndersG wrote in Tue Jun 16, 2015 7:41 am:If this is an issue, merely changing this angle (rear or front Z in fact) in the FDM, in a first step, would improve the behaviour. Only the 3D view would remain a bit wrong (a few degrees).


There are no rear and front Z (of contact points, I presume) to change now for the water behaviour, but one could change the -3.0 deg offset in the component computing hydro/float/pitch-deg in Systems/c172p-hydrodynamics.xml to see if the angle of the floats matters.
by AndersG
Tue Jun 16, 2015 11:45 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

wlbragg wrote in Mon Jun 15, 2015 6:37 pm:After reading all the comments on RL practices and going back to watch the videos of RL takeoffs and landings,

https://www.youtube.com/watch?v=ndz9WzNne5k
look at the flaps in all three takeoffs. Look at the elevators in the last take off before and as it gets full power.

https://www.youtube.com/watch?v=bQCPbcy-95U
Look at the yoke position shortly after touchdown.

I am really pleased with the new hydro FDM.


Thanks!

Looking at the video reminds me that there is one effect (among others) that the current c172p hydrodynamics lacks, and that is more proper planing induced pitch moment - the aircraft in the first video seem to pitch up significantly more during their run than our c172p can do. Currently the planing pitch moment (and planing lift and drag) is derived directly as a function of the buoyancy, i.e. from the immersed volume, which is not completely true to real life. In particular, in a planing attitude as in the videos, most of this volume would seem to be to the rear while my guessed pitch moment would make it more evenly distributed (i.e. tend to a lower pitch attitude). There are "proper" models for planing for planes and wedges that could be used to refine this. I think a better model there would increase the hydrodynamic pitch up moment during the water run and more easily force the aircraft towards a safer attitude. That might also solve another thing that is indistinct in the current model, namely the freedom to choose a higher (but suboptimal) pitch when planing - with the floats (dynamically) resting on the forebody/step the aircraft can be pitched up further before the rear of the floats contact the water.

I have some papers on modelling planing and ["Practical Ship Hydrodynamics", V. Bertram, 2000.] on hand as one of my summer projects to improve the hydrodynamics modelling.
by AndersG
Tue Jun 16, 2015 7:32 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

something wierd is happening, must be something covered already on the thread so i apologize for this question:

but if i have a clean fgdata directory, and i download c172-detailed-master.zip from the first page, and then i copy paste into Aircraft directory.

it starts and i can see all the options for the new aircraft, but it uses old model.. why is that? :(

edit: this did the trick!!

gsagostinho wrote in Mon Jun 01, 2015 10:47 pm:@wlbragg A miracle!! After the recent name change from c172p-detailed to c172p, I renamed the aircraft folder to c172p and removed the old default c172p. Now my plane floats!!:
...
by hamzaalloush
Wed Jun 03, 2015 6:32 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

HI gsagostinho, wlbragg ... aso,

Congratulation for the c172p (since c172p-detailed). The c172p in the future is the used up to FlightGear 3.6.
Thanks for realise with floats and amphibious Version.

Thanks for your hard work in the past. I´ am a fan of the new c172p. :)

D-ABBA
by D-ABBA
Tue Jun 02, 2015 2:58 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

gsagostinho wrote in Mon Jun 01, 2015 10:47 pm:@wlbragg A miracle!! After the recent name change from c172p-detailed to c172p, I renamed the aircraft folder to c172p and removed the old default c172p. Now my plane floats!!:



Mine floated long before that, and with the -detailed bit on the name, too!
by MIG29pilot
Tue Jun 02, 2015 2:11 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

@wlbragg A miracle!! After the recent name change from c172p-detailed to c172p, I renamed the aircraft folder to c172p and removed the old default c172p. Now my plane floats!!:

Image

:D

About the development:
- thanks for the menu option about the ignoring the heat and vent.
- we indeed need to find a better label for it though. What about "enable fixed interior temperature" or "enable constant cabin temperature" or something like this?
- currently it's also confusing to have an option called "ALS shadow" and another "ALS shadow volume". I know how they work, but most people trying the plane for the first time won't. How can we improve this?

Cheers to you all!
Gilberto
by gsagostinho
Mon Jun 01, 2015 10:47 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

The JSBSim hydrodynamic floats version now seem to work for normal take-off and landing, but (the result of) non-normal situations are not modelled. Integrating it with the special effects (splashes, damage etc) in the c172p would preferably need input from wlbragg and any others who made them.

Dany, I see you added the point masses for the floats. How certain are you of their fore-aft location? (Read this as: can I move them aft to get a decent idle attitude? :)

Has anyone found take-off performance data for a float equipped c172p? That would help tuning the lift and drag numbers.

Example problem:
If flipped upside-down the float equipped c172p currently rests on the wing tips and the tail tip with some unstable bogus hydrodynamic action (there is no buoyancy data for roll angles outside +/-8 degrees). Covering this attitude with buoyancy data would be impractical as the state space becomes very large, leading to excessive time to generate it and also very many and large tables for little gain. If we want to give a "realistic" final resting position for the crashed aircraft in this case, I think having structure contact points at the nose and tail of the floats that activates when the aircraft has gone over might do it if the hydrodynamics system and the wing tip and tail top contact points are disabled at the same time.
by AndersG
Sun May 31, 2015 8:52 am
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466

Re: Cessna 172P detailed (was "Cockpit textures for the c172

wlbragg wrote in Thu May 28, 2015 7:13 pm:
AndersG wrote in Thu May 28, 2015 6:00 pm:I tweaked the JSBSim hydrodynamics for the c172p a bit so that it can now take off

I don't understand "so that it can now take off". Is this amphibious, pontoon or both (I've been referring to pontoon as in no gear and amphibious as with gears).
I was only aware of amphibious with gear down not being able to move in the water, (which is obliviously not correct), is that what this adjustment corrects?


It is an alternative implementation of floats using the hydrodynamics system for JSBSim (see my Short Empire and my various boats) and no contact points. It is only the pontoon version at this time (the branch is based before the amphibious version was added) - but it should be workable for amphibious too since the land gears are retracted on water. The tweak refers to the first version of this alternative implementation that was announce a few pages back which could not take off. The tweaking is mainly in changing the displacement and planing drag and lift and the change-over between them - and making sure the water stop influencing the aircraft once it is in the air.. :).
by AndersG
Thu May 28, 2015 7:18 pm
 
Forum: Aircraft
Topic: Cessna 172P detailed (was "Cockpit textures for the c172p")
Replies: 2759
Views: 405466
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