Canard angle in Jas-39 Gripen
10-05-2008, 04:55 AM
#1
Canard angle in Jas-39 Gripen
Hello guys,
A buddy of mine is flying a JetLegend JAS-39 Gripen.
On the gripen, the canards come with a built in angle into their shaft that holds them. this means they could be installed in either an anhedral or dihedral angle.
Anyway, since there was no manual with the model - he installed them in an anhedral position and this is how it was flying until now. Note: model flys fine, but it does have a slight instability on the roll axis, which we contributed to the rather short wing span.
He found lately that the original full scale gripen uses dihedral angle in the canards, and changed his over as well.
My question is - what kind of change in flight characteristics could we anticipate when going from anhedral to dihedral on the canards ?
thanks.
A buddy of mine is flying a JetLegend JAS-39 Gripen.
On the gripen, the canards come with a built in angle into their shaft that holds them. this means they could be installed in either an anhedral or dihedral angle.
Anyway, since there was no manual with the model - he installed them in an anhedral position and this is how it was flying until now. Note: model flys fine, but it does have a slight instability on the roll axis, which we contributed to the rather short wing span.
He found lately that the original full scale gripen uses dihedral angle in the canards, and changed his over as well.
My question is - what kind of change in flight characteristics could we anticipate when going from anhedral to dihedral on the canards ?
thanks.
10-06-2008, 10:51 AM
#2
RE: Canard angle in Jas-39 Gripen
The Gripen does tend to rock back and forth a bit in roll (just like the F-16 "hunts" in yaw). I would doubt that you will notice any difference with the flipped canards though, if I recall all those subsonic aerodynamics courses accurately, in theory you should get slightly better high AOA performance with them corrected.
Feel free to check out and post to the Gripen Builders/Owners thread. We're trying to keep all the info in one place so it's easy to find (particularly for the builders).
Regards,
Jim
Feel free to check out and post to the Gripen Builders/Owners thread. We're trying to keep all the info in one place so it's easy to find (particularly for the builders).
Regards,
Jim
