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Author Topic:   TAILSLIDE...PANG...MH, I need your braintrust!
Zurawski
Pilot 		posted 07-22- 11:42 AM     Click Here to See the Profile for Zurawski   Click Here to Email Zurawski     Edit/Delete Message   Reply w/Quote
Hey guys...

Working on the F86's FM ... There seems to be a point where the speed of the aircraft (roughly 550 mph).. where the aircraft begins wild rotational occilations. What's weird is "IF" I manage to control the aircraft durring this ..ahem... manuver. I notice the speed burst up to 600+ mph ... even in a climb.

What's going on? I'm "GUESSING" the DOF springs of the wings are fluttering ...but thought I'd ask first before I go screwing with the DOFs ...

Thanks guys

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Laika 801
Pilot 		posted 07-22- 11:56 AM     Click Here to See the Profile for Laika 801   Click Here to Email Laika 801     Edit/Delete Message   Reply w/Quote
Tail - did you get any of my mails ?

Zur - sorry for using this topic for my request !


LK801

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Pang
Pilot 		posted 07-22- 02:16 PM     Click Here to See the Profile for Pang   Click Here to Email Pang     Edit/Delete Message   Reply w/Quote
Rotation around which axis?

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Zurawski
Pilot 		posted 07-22- 02:19 PM     Click Here to See the Profile for Zurawski   Click Here to Email Zurawski     Edit/Delete Message   Reply w/Quote
... Pang,

Ummm... [Zur realizing he's Polish] ... The Plane rocks left and right violently ... Ummm ... Would that be horizontally?

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Pang
Pilot 		posted 07-22- 02:40 PM     Click Here to See the Profile for Pang   Click Here to Email Pang     Edit/Delete Message   Reply w/Quote
Just for reference:
Nose up and down - Pitch axis
Nose side to side - Yaw axis
Around longitudinal center of fuse - Roll axis

I got the file installed for the plane and I'll look this afternoon. (BIG GRIN)

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Pang
Pilot 		posted 07-22- 05:23 PM     Click Here to See the Profile for Pang   Click Here to Email Pang     Edit/Delete Message   Reply w/Quote
You hit the nail on the head, Zur. I'll bet it's starting an oscillation at that speed and flapping it's wing. Looks like you have yet to add the left wing root DOF, and I'd give it some dofDamp. Once the oscillations start, the damp will absorb them.

Perhaps when you get the other DOF in, the forces will act more in harmony, and absorb even more of the oscillation.

Sure looks like it's going to be a fun airplane!! I love the spool up of the turbine!

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Laika 801
Pilot 		posted 07-22- 07:16 PM     Click Here to See the Profile for Laika 801   Click Here to Email Laika 801     Edit/Delete Message   Reply w/Quote
I saw similiar things on the I16: up to 700mph - I changed FM somehow and it was gone...

LK

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Sv
Pilot 		posted 07-22- 10:57 PM     Click Here to See the Profile for Sv   Click Here to Email Sv     Edit/Delete Message   Reply w/Quote
The Fokker DVIII does this as well... Charm is working on the FM now...

------------------
-Sv =FC=

WWI in SDOE!


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Tailslide
Pilot 		posted 07-23- 05:39 PM     Click Here to See the Profile for Tailslide   Click Here to Email Tailslide     Edit/Delete Message   Reply w/Quote

Sorry was away on a rafting trip..

The I16 can do 700mph ?

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