Jump to content

Why do canards behave like this?


Recommended Posts

I'm making a spaceplane with a wingspan angle that points forward. It looks pretty great and it works fine, but I can't get the Advanced Canards to behave correctly. Due to the angle of the wings, flaps are difficult to position, so I placed a set of canards on the nose of the plane. No big deal, except when I flipped the Advance Canards around so they point forward, they began to pitch in the wrong direction. They act like they're behind the CoM and I'm unable to do anything about it (That I know of). I tried right-clicking and changing the deploy state to "Inverted" but that doesnt change anything. It this a bug, or are they supposed to behave like that(?) or am I missing some function to invert the pitch? 

Edit: i'm aware of how control surfaces should behave with respect to the center of mass, i flip control surfaces all the time... it's just that these canards arent...

Pic of canards deploying backward

Screenshot of canard placement, CoM, and CoL

Edited by PieFlava
Link to comment
Share on other sites

6 hours ago, PieFlava said:

they began to pitch in the wrong direction. They act like they're behind the CoM

I don't know about any way to change the pitch direction manually. However just to mention it (but I believe that's what you are already referring to) the automated assignment of pitch direction is done based on the canard's location relative to the (current, consider fuel consumption) CoM. If they are in front of it, pitch is reversed.

Could you post a screenshot illustrating the problem (e.g. while hitting the pitch up key), as well as one from the SPH including CoM and CoL?

Link to comment
Share on other sites

  • 2 weeks later...
On 12/5/2015, 8:04:24, Snark said:

So you flipped the canards around backwards, is it surprising that they control backwards?

That doesnt matter. They behave the same way regardless. you're saying you've never put control surfaces on backward? you're missing out dude. can look really great sometimes

Link to comment
Share on other sites

On 12/5/2015, 9:05:21, Zephram Kerman said:

Deploy state is pretty useful, although it's not relevant to your problem. When you click the other button "deploy", the control surface will deflect all the way, so that you can let go of the key. Invert will make it deflect the other way. I use this a lot for reentry.

I was going to use this, but it wouldn't work with my other surfaces ("deploy state: inverted" doesnt change anything) :/

Link to comment
Share on other sites

Another idea that you might want to try:

Can you flip the canards backwards around 2 axes? For example, if you want to rotate the canards around the X axis, can you instead rotate it around the Y axis and then the Z axis? That might make the controls the opposite of the opposite of what you want ( = what you want). The slight downside is that there is a chance that they will be correct for pitch but the opposite for roll which should be ok as long as you are setting up the control surfaces 'properly'.

Link to comment
Share on other sites

This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...