As I tested various options on this gripen, there is no need for a gyro. However to verify a gyros flying envelope i tried a gyro in the Gripen and of last weekend this was the only canard/Delta jet I've owned and temporarily flying with a Installed hobbyeagle A3 gyro. I few it 10 times and What i found is that there’s zero need to reverse any servos and defiantly zero need for two gyros to make this jet a gyro Assisted jet. I also have the ability yo remove aileron controls to the canards at the flick of a switch. I will make a video of my transmitter settings and of how I set up the jet after work today to help with some of the confusion ive seen here.
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Originally posted by Airguardian View PostNow that's an interesting idea!
Would solve the problem of needing to invert a servo direction.
Tested it on the bench with an A3Pro. It works. Needs a bit of fiddling to get everything moving in the right direction. It does solve the "invert servo" problem.
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Originally posted by kallend View PostI've yet to find a R/C plane that NEEDED a gyro. Almost all fly better and smoother, especially in gusty winds, with a gyro.
A little bit of me dies whenever I read someone talking about whether or not a model NEEDS a gyro.
Your car doesn't NEED power steering or cruise control either, but it is damn nice to have anyway. It is virtually never about need.
Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Originally posted by janmb View Post
This!
A little bit of me dies whenever I read someone talking about whether or not a model NEEDS a gyro.
Your car doesn't NEED power steering or cruise control either, but it is damn nice to have anyway. It is virtually never about need.
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Originally posted by kallend View Post
Tested it on the bench with an A3Pro. It works. Needs a bit of fiddling to get everything moving in the right direction. It does solve the "invert servo" problem.
This is how I have been flying it.
AR8360T receiver set up for elevons with AS3X on the elevons. Pitch input also sent to channels 6 and 7 which I have previously used for unstabilized canards with 7 reversed to get both canards moving in same direction.
Adding gyro to the canards for pitch only:
I used the A3Pro because it allows the gains of the three axes to be set independently. (Can't do this with the A3L)
Gyro settings:
Normal mode, elevon/flying wing, orientation flat upright. Set aileron gain to zero, elevator to something non zero, rudder gain irrelevant.
Pitch output from receiver (Ch6) to gyro elevator input. Nothing to rudder. *Temporary* 1.5mS (neutral) input to aileron input (not sure if needed but didn't hurt) **
Gyro "Aileron" and "elevator" outputs to left and right canards. "Rudder" output not connected.
A MIRACLE HAPPENED! Everything worked in the correct direction first time. The canards still respond correctly to elevator stick input, move in the correct direction in response to a pitch change, and do not respond at all to roll.
** I don't know whether an input to the "aileron" on the gyro is needed. It flashes a red light if nothing is connected there but everything still seems to work OK. However, leaving a input in an undefined state is not good practice*** and I now have a spare channel (Ch7) so I'm setting that to 1.5mS fixed and leaving it connected.
*** A3Pro manual specifically states that the rudder input need not be connected for an elevon/flying wing configuration.
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Originally posted by kallend View Post
Follow up with more details.
This is how I have been flying it.
AR8360T receiver set up for elevons with AS3X on the elevons. Pitch input also sent to channels 6 and 7 which I have previously used for unstabilized canards with 7 reversed to get both canards moving in same direction.
Adding gyro to the canards for pitch only:
I used the A3Pro because it allows the gains of the three axes to be set independently. (Can't do this with the A3L)
Gyro settings:
Normal mode, elevon/flying wing, orientation flat upright. Set aileron gain to zero, elevator to something non zero, rudder gain irrelevant.
Pitch output from receiver (Ch6) to gyro elevator input. Nothing to rudder. *Temporary* 1.5mS (neutral) input to aileron input (not sure if needed but didn't hurt) **
Gyro "Aileron" and "elevator" outputs to left and right canards. "Rudder" output not connected.
A MIRACLE HAPPENED! Everything worked in the correct direction first time. The canards still respond correctly to elevator stick input, move in the correct direction in response to a pitch change, and do not respond at all to roll.
** I don't know whether an input to the "aileron" on the gyro is needed. It flashes a red light if nothing is connected there but everything still seems to work OK. However, leaving a input in an undefined state is not good practice*** and I now have a spare channel (Ch7) so I'm setting that to 1.5mS fixed and leaving it connected.
*** A3Pro manual specifically states that the rudder input need not be connected for an elevon/flying wing configuration.
I may resort back to just having one gyro AR8360T and leaving my canards un stabilized.
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Originally posted by 4923crew View PostAs I tested various options on this gripen, there is no need for a gyro.
That said, if you want to make the best out of it, it is not a bad idea. The reasons have been covered quite in detail already.
Originally posted by HaroldAnderson View PostOn those calm days the Gripen is super smooth without gyro on, at least it feels that way to me.
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VT just showed up at RCC:
This Thrust Vector Upgrade Set is intended for advanced pilots only because it significantly widens the potential agility of the stock Freewing 80mm JAS 39 Gripen. Roll rate, yaw control, and elevator authority are all increased. The aircraft will be able to depart conventional flight patt
Shouldn’t be long now before Motion gets them in.
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I decided to go ahead with the LE flap modification I've been considering and got a good start on one wing, cutting out the shape and installing hinges, the servo etc. Nothing is finalized (glued) and it's very much a WIP but looking pretty good so far, I think. The LE drops about 25 degrees right now, which doesn't look like much, but as it's such a large surface span-wise, and on the front of the wing, I'm thinking it may be enough travel, but of course don't know. At the moment I'm trying to figure out a good way to cover the gap on the underside of the hinge line when the flap isn't deployed. Comments and ideas are more than welcome.
Christmas vacation started today so I'll be able to get some quality time in the aerospace facility uninterrupted by work.
Tom
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Originally posted by xviper View PostVT just showed up at RCC:
This Thrust Vector Upgrade Set is intended for advanced pilots only because it significantly widens the potential agility of the stock Freewing 80mm JAS 39 Gripen. Roll rate, yaw control, and elevator authority are all increased. The aircraft will be able to depart conventional flight patt
Shouldn’t be long now before Motion gets them in.
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Originally posted by Airguardian View Post
No one said gyros were 'needed' as such, now, did any?
That said, if you want to make the best out of it, it is not a bad idea. The reasons have been covered quite in detail already.
Gyros helping with wind gusts (for me) is a nice second derivative of having them installed but not the main reason I do install them to begin with so... ;)
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Same picture that's been on Motions site for a long time. Like other TVs the outside of the nozzle is foam that can be easily peeled off and a better looking 3D printed part put there.
On yesterdays pod cast James said again the TVs are next year. I wish they would update the web site with more info and a better arrival date.
Originally posted by kallend View Post
I don't like the job they did on the nozzle. It looks pretty cheesy.
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Originally posted by Airguardian View Post
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Originally posted by HaroldAnderson View Post
Yes, it looks a lot like my old 90mm F-18E V2 that was made of EPS foam. If I get one I may have to modify your nozzle to fit it.
I already did overlay nozzles for the Eurofighter TV. Been up on Thingiverse for a long time.
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Originally posted by xviper View PostVT just showed up at RCC:
This Thrust Vector Upgrade Set is intended for advanced pilots only because it significantly widens the potential agility of the stock Freewing 80mm JAS 39 Gripen. Roll rate, yaw control, and elevator authority are all increased. The aircraft will be able to depart conventional flight patt
Shouldn’t be long now before Motion gets them in.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Having seen Harold's videos, I'm thinking I may forget the VT nozzle for this plane. The plane appears to be able to do stuff that one would have previously thought it could only do with VT. In its stock form, the Grip won't hover anyway, so it may be a pointless add-on. (The VT nozzles may serve a more valuable purpose with the big MiG, though.)
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Originally posted by kallend View Post
I plan to modify it myself.
I already did overlay nozzles for the Eurofighter TV. Been up on Thingiverse for a long time.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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