tetryds

Official FAR Craft Repository

1043 posts in this topic

2 hours ago, CrayzeeMonkey said:

There was no dihedral on the plane, but on turns I discovered that the wings had a tendency to flex up and cause a dihedral of some sort. A strut later it was reduced and the plane can turn much better now.

Thanks!

To save on weight you could also try adding a slight anhedral that will naturally flex up during high G-loading for better roll authority and droop down in level flight for better stability. It seems to work pretty well for fast-mover designs, it made my Mig-25 lookalike really nimble.

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9 hours ago, CrayzeeMonkey said:

There was no dihedral on the plane, but on turns I discovered that the wings had a tendency to flex up and cause a dihedral of some sort. A strut later it was reduced and the plane can turn much better now.

Thanks!

Dihedral effect isn't limited to dihedral wings(/lifting surfaces). A vertical surface (tail fin!) will also make your plane roll when slipping, as long as it's mounted above or below the CoM. If that wasn't the case, nearly every plane would have some dihedral, because you generally want a little dihedral effect (-> roll stability)

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21 minutes ago, Cratzz said:

Hey, can someone tell me why this is stuck to the runway? Been doing this awhile, and it's happend before with some tweakscaled parts but this has none of that.

https://dl.dropboxusercontent.com/u/5191989/Untitled2.png

Where about is your CoM relative to the rear gears? Just curious. Also, my first instinct taking a look at this is that you've got some hellacious wing loading going on there.

Also curious as to what that control surface on the front of your wing does.

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3 minutes ago, capi3101 said:

Where about is your CoM relative to the rear gears? Just curious. Also, my first instinct taking a look at this is that you've got some hellacious wing loading going on there.

Also curious as to what that control surface on the front of your wing does.

Waay of i just noticed, i'll correct that and im probably fine. Wing loading? The control surface on the front acts as a canard and gets me of the ground.

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26 minutes ago, Cratzz said:

Wing loading?

Ratio of the mass of the craft to the reference area of the wing. Higher wing loading tends to lend to better high-speed characteristics (particularly at low altitude), while lower wing loading lends itself to lower takeoff and landing speeds, better climb rate and cruise performance, and better sustained turning performance (in brief). My own self, I usually shoot for something in the 0.3-0.5 tonne per square meter range during my initial design calculations.

Edited by capi3101

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17 hours ago, Cratzz said:

Hey, can someone tell me why this is stuck to the runway? Been doing this awhile, and it's happend before with some tweakscaled parts but this has none of that.

https://dl.dropboxusercontent.com/u/5191989/Untitled2.png

In addition to what was suggested above, maybe you should consider having bigger elevator (maybe put an all-moving tail for maximum control surface area).

About wing loading, you can get wing area from FAR window that you captured in screenshot. Just temporarily remove all wing surfaces except for actual wings (so, tail, rudder and all other moving horizontal components, since they normally don't give you any lift).

As for current state, with information from the picture, I would guess that it's around 600 kg/m^2, but i might be way off. That would still be flyable (I think I've made some stuff before that had about 750 kg/m^2), but it won't be easy to get off the runway.

Edit: looking at the burn time, now i realize that mass if probably much lower than what i thought (I assumed about 20 tons). In that case, simply being able to pull up on the runway should let it take off without any problem.

Edited by bzimac

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Fellas i've made a grand accomplishment for myself tonight, Vanilla folding wings! Looks ugly as hell but I'm so happy with them! Aircraft carrier here I come! I must stress its ugly, and I dont like the awkward angle the wings sit at while up, but it works! Good ol vernor engines in the little pods on the wingtips, then under the wing part on the fuselage I made a little hinge that the wing uses to rotate up! Hardest part was getting the docking ports lined up, but trial and error does the job! http://i.imgur.com/FiNxvr8.jpg 

Ok how the hecc do I insert pictures into my post? I really wanna show this thing off!

 

Edited by Deizelpunk
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1 hour ago, Deizelpunk said:

Ok how the hecc do I insert pictures into my post? I really wanna show this thing off!

On bottom right corner there is "Insert other media" combobox. Click on it and choose "Insert image from URL". Other way is to copy-paste image link directly in post but you need to choose option to keep formating, not cancel it. Obviously it not always work as intended.

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23 minutes ago, kcs123 said:

On bottom right corner there is "Insert other media" combobox. Click on it and choose "Insert image from URL". Other way is to copy-paste image link directly in post but you need to choose option to keep formating, not cancel it. Obviously it not always work as intended.

Hmmmmm doesent work for me

 

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Working on F4 Phantom, apart from having a little bit too much positive AoA, she flies well! Tried too be as true too the reallife counterpart as possible, so lenght/width/height/drymass/wetmass etc is mostly correct.

I recently learn about Area Ruling, don't know if that was a thing in the 50's, but did too nonetheless :) There are some more issues im not quite happy with (like the intake) but im saving that for Rev. 2! :wink:

https://dl.dropboxusercontent.com/u/5191989/F4.3.png

https://dl.dropboxusercontent.com/u/5191989/F4.2.png

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19 minutes ago, Cratzz said:

I recently learn about Area Ruling, don't know if that was a thing in the 50's

Was a thing in Germany even before 1945. Wing sweep as early as the thirties. Allies should have known about wingsweep too, considering it wasn't kept a secret. They did, however, ignore any knowledge they may have had about it, until they found German blueprints and a prototype (or several prototypes?).

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10 hours ago, FourGreenFields said:

Was a thing in Germany even before 1945. Wing sweep as early as the thirties. Allies should have known about wingsweep too, considering it wasn't kept a secret. They did, however, ignore any knowledge they may have had about it, until they found German blueprints and a prototype (or several prototypes?).

Ones again does war prepel science, thanks for the input!

Phantom Mark 2, complete redesign (cause why not) New intakes and better balanced. SPACE-program? Bah! Jets are much more appealing :)

F4.Mark.2.png

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Btw: SpaceDock says that FAR is still outdated. Does the outdated version work with the latest KSP patch? Or are you using some experimental branch?

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5 hours ago, FourGreenFields said:

Btw: SpaceDock says that FAR is still outdated. Does the outdated version work with the latest KSP patch? Or are you using some experimental branch?

its the dev version. Use at your own risk. Don't bug ferram! :wink:  That sort of thing.

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Posted (edited)

I finally gave up waiting for an official release of FAR, installed the supersecret dev version and built this, a (re)creation of Sukhoi's planned T-4MS "200" partially-stealthy supersonic strategic bomber from the late 1970s. Click on the gif below to link to an imgur album with loads of background information about the real thing, as well as some of my craft's specs and the mods I used.

kGZU7y1.gif

And here's a video showcasing what it can do. Unfortunately BDArmory Continued doesn't play nicely with any of the nuclear weapon mods, so I couldn't show you what it's really designed for: dropping nuclear weapons from high altitude while moving at mach 3. Even with 20+ km of separation, the blast always destroys the aircraft.

 

Edited by Elmetian
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Just here to say... I aint dead yet.

 

0i3eAVR.jpg

xgApODW.jpg

alFP9bn.jpg

0yRA9lF.jpg

 

Using FAR, BD Armory, and AJE.  I still got it... a bit rusty but can STILL make SSTOs.

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