Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Mar 09, 2012, 05:08 PM
Brett
bjaffee's Avatar
So Cal
Joined Apr 2002
5,285 Posts
Ian,

Does the gain adjustment dial on the GYA351 have any effect when you have the remote gain adjustment plugged in? I'm actually trying to figure this out for my 401, which has both remote gain adjustment and "delay" dial setting on the gyro itself.
bjaffee is offline Find More Posts by bjaffee
Last edited by bjaffee; Mar 09, 2012 at 05:21 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 09, 2012, 05:29 PM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,107 Posts
I don't know off hand. Sometimes the dial on the gyro is only used when remote gain is
not plugged in. Sometimes the dial on the gyro is not gain at all, but is equivalent of
end point adjustment to prevent the gyro from maxing out the controls mechanically,
and has a side effect of reducing the gain as well. The 401 is made for helis
so it may be kind of tricky to bench test (re discussion of heli gyros earlier in the thread).

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Old Mar 09, 2012, 05:40 PM
Brett
bjaffee's Avatar
So Cal
Joined Apr 2002
5,285 Posts
Yeah, there's actually 2 dials...one for the max control limits, and one for "delay." If the 351 is similar, I'm guessing the remote function overrides the "delay" dial.
bjaffee is offline Find More Posts by bjaffee
Reply With Quote
Old Mar 10, 2012, 02:02 AM
alpine soarer
Bernese Oberland, Switzerland
Joined Nov 2008
56 Posts
thanks daemon!

i mounted it in the plane last night and will start testing soon!

martin


i will have to use a 3 way switch to controll my gya351 (due to my german transmitter).
to start off, futaba says to adjust the G-gain to 50% (Gyro) and the C-gain to 100% (Control).

my plane is built for a max. speed of about 300mph (far enough for me).
since we only have good winds maybe 4 times a year at my site, i would like to start with safe adjustements... shall i start off with the rates mentioned above, or would it be safer to reduce the G-gain to 25%?
Bussard is offline Find More Posts by Bussard
Last edited by Bussard; Mar 12, 2012 at 08:19 AM. Reason: new question
Reply With Quote
Old Mar 12, 2012, 11:53 AM
Rocket geek
Highlands Ranch, CO
Joined Dec 2007
651 Posts
Quote:
Originally Posted by Daemon View Post
I've been flying gyro'd DS planes
for a few years and I have never felt the slightest need to have stabilization on the
pitch axis (elevator). I can't even imagine why people think it'd be useful there.
In fact, I think HH mode on elevator would produce some strange behavior.
You'd pull up to set the turn radius, and then have to center the stick to hold
that radius. Could be kind of confusing as you'd have to actively push and pull
every lap to keep the plane from drifting back. I know some people trim their planes
to sort of fly like that, but many of us like to either always pull a little, or always
push a little, and you can never do that with a HH gyro (any continuous input, will
result in continuous increase in response).
ian
I don't doubt that heading-hold on the pitch axis has not been needed, but if it were implemented, I don't see why it would behave as you described. On the roll axis, a gyro in heading hold mode will re-zero the roll angle after a disturbance, but holding the stick to the side commands a roll rate to give you a new commanded roll. Wouldn't a constant pull-back on the stick similarly command a constant pitch rate (flying in a circle)?
Adrian A is offline Find More Posts by Adrian A
Reply With Quote
Old Mar 12, 2012, 12:00 PM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,107 Posts
Quote:
Originally Posted by Bussard View Post
thanks daemon!

i mounted it in the plane last night and will start testing soon!

martin


i will have to use a 3 way switch to controll my gya351 (due to my german transmitter).
to start off, futaba says to adjust the G-gain to 50% (Gyro) and the C-gain to 100% (Control).

my plane is built for a max. speed of about 300mph (far enough for me).
since we only have good winds maybe 4 times a year at my site, i would like to start with safe adjustements... shall i start off with the rates mentioned above, or would it be safer to reduce the G-gain to 25%?
Lower rates would be safer than higher, and they likely aren't accounting for DS speeds in
their recommendations.

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Old Mar 12, 2012, 02:38 PM
alpine soarer
Bernese Oberland, Switzerland
Joined Nov 2008
56 Posts
thanks ian.

i will start of with about 25% and see where i end up.

since i will have to adjust it manually (and remove the wing) everytime i
want to start of at a decent rate, so i don't have to adjust it too often - guess i'm a bit lazy.

regards, martin
Bussard is offline Find More Posts by Bussard
Reply With Quote
Old Mar 12, 2012, 02:44 PM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,107 Posts
Your transmitter does not allow you to change the end points for the channel
that the three way switch is controlling? You should be able to tweak your gyro gain from there.

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Old Mar 16, 2012, 07:44 PM
Registered User
Australia, QLD, Hervey Bay
Joined Apr 2008
176 Posts
Ian, thanks for the exellent descriptions & details. Leigh
lee8sec is offline Find More Posts by lee8sec
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Video Catbells Dynamic Soaring II Rooster-X Sailplane Talk 0 May 04, 2011 03:48 AM