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Apr 21, 2010, 02:45 PM
spitfire thunders superior
tuck's Avatar
Pefectly explained thank you Dennis. Cg is good to me plane rolls great but never had a way to really find out if diff was working or not so I just didn't use it. Now like I said expo is like a seesaw to me one day I have mid expo then next to none at all. My flights don't really vary just my thumb movement incraments I guess.
Dennis do you still have your sukhio for sale?
Zeb
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Apr 21, 2010, 02:51 PM
Registered User
Dennis C's Avatar
Yes I do, are you still interested?

Dennis
Apr 21, 2010, 03:44 PM
For the Birds
Stagger_Wing's Avatar
Quote:
Originally Posted by tuck
... Do any of of you guys use differentail. If so how do you decide how much is effective, twenty rolls to a click untill your happy? Yup I still can't keep a consistant expo rate. So I might not be ready for diff.
Quote:
Originally Posted by Dennis C
Do a roll on a down line, if it has a barrel in it then add some sifferential ,this should be your last trim work, so be sure that C>G> are correct and all your other trimming is done.

Make sure you do not have any elevatro when you do the roll.
Dennis

Guys,

You donít want aileron differential on an aerobatic model because it will increase adverse yaw during inverted flight. As Dennis said if the airplane is not rolling axially it is probably because of elevator input. For aileron rolls make sure the airplane is unloaded before you start the roll and when doing slow rolls use the rudder to correct for any adverse yaw. Of course there is always the possibility that the linkages are not exactly the same for each aileron in which case programming differential in to the transmitter to get symmetrical aileron deflection may be necessary.

-Scott
Apr 21, 2010, 05:44 PM
Scott Stoops
sukhoi26mx's Avatar
Quote:
Originally Posted by Stagger_Wing
Guys,

You donít want aileron differential on an aerobatic model because it will increase adverse yaw during inverted flight. As Dennis said if the airplane is not rolling axially it is probably because of elevator input. For aileron rolls make sure the airplane is unloaded before you start the roll and when doing slow rolls use the rudder to correct for any adverse yaw. Of course there is always the possibility that the linkages are not exactly the same for each aileron in which case programming differential in to the transmitter to get symmetrical aileron deflection may be necessary.

-Scott
uhhh..... differential can be the cure to adverse yaw, in addition to being the cause if setup incorrectly. Assuming symmetrical control throws while testing for axial rolls on a downline with the power off, differential can absolutely help. Depends on wing position.

Scott
Apr 21, 2010, 06:07 PM
Postcards From The Purple Edge
tuppertn's Avatar
Oh, c'mon, Scott...like you would know anything about this plane.



kendall

EDIT: I hope the sarcasm really came through there.
Apr 21, 2010, 07:11 PM
Registered User
ambientech's Avatar
Quote:
Originally Posted by Fliprob17
I am not saying this is the case.......but if anyone was running an older 6200 and had a habit of using the LVC as their "timer" the older 6200's would reboot/lose signal. I've got two handfuls of the older 6200 with hundreds of flights each, no issues, but I always change my LVC to one cell count below what I am actually flying so it never kicks in, flying by timer there's no risk to the battery anyway.
+1

I have a 6200 that if I hit lvc it would glitch. I just don't hit lvc anymore and it is fine. Everyone thought I was crazy, saying it was impossible because pack voltage but now I know I'm not alone.
Apr 21, 2010, 07:17 PM
Go guerrilla
jfv61's Avatar
Quote:
Originally Posted by Fliprob17
...I always change my LVC to one cell count below what I am actually flying so it never kicks in...
Amen! Disadvantages of LVC far outweigh any benefits.
Apr 21, 2010, 07:24 PM
For the Birds
Stagger_Wing's Avatar
Quote:
Originally Posted by sukhoi26mx
uhhh..... differential can be the cure to adverse yaw, in addition to being the cause if setup incorrectly. Assuming symmetrical control throws while testing for axial rolls on a downline with the power off, differential can absolutely help. Depends on wing position.

Scott

Ok, now Iím curious. I can see how wing position affects roll performance, but I donít see how it can affect adverse yaw. Can you elaborate on this a little?

Thanks,

Scott
Apr 21, 2010, 10:29 PM
Scott Stoops
sukhoi26mx's Avatar
Quote:
Originally Posted by Stagger_Wing
Ok, now I’m curious. I can see how wing position affects roll performance, but I don’t see how it can affect adverse yaw. Can you elaborate on this a little?

Thanks,

Scott
Wing position doesn't affect adverse yaw (to the best of my knowledge), but it affects axial roll performance which is what we're really talking about here. I could care less why my model doesn't roll axially (i.e. adverse yaw, excessive effective dihedral, undesirable wing position, etc), but I do want to know the solution for it. That solution is generally found in non-symmetrical aileron throw, or differential. It can also be found in vertical and lateral CG adjustments, although both are dramatically less effective and are not commonly required.

FWIW, the general complaint I hear against differential is that it varies when rolling from upright than inverted. To counter, I offer that ALL testing for axial rolling should be done on a vertical line where there is no up/down dilemma in the rolling sense. In a vertical line, the wing is unloaded and rolls as purely as the airframe allows. By testing in that condition, you're seeing the true roll axis from which changes to aileron throw should be made. All other natural rolling qualities, be they CG or side area driven while rolling in horizontal flight, should be compensated for with rudder and elevator.

Scott
Apr 21, 2010, 11:15 PM
spitfire thunders superior
tuck's Avatar
oThanks Scott, its nice to have a 3dh frame design engineer/ perfecter, answering my green guy questions thoroughly.

Yes Dennis I am interested, acouple of items take priority first. I,ll pm you when I'm ready to buy. How the SC?
Zeb
Last edited by tuck; Apr 21, 2010 at 11:25 PM.
Apr 22, 2010, 01:04 AM
For the Birds
Stagger_Wing's Avatar
Thanks Scott
Apr 22, 2010, 09:54 AM
KB3VOJ
cherokee180c's Avatar
+1 on the 6200's I have 4 of them flying for over a year in 2 planes and a 500 and 50 size helicopter with never a single glitch. I always fly by a timer though and never get anywhere near LVC. I use an Eagle Tree flying very agressively to get the average worst case amp draw and then set my timer to leave a full 20% capacity left in the pack. I rarely even get to the 20% level as my setup flights are truly worst case scenarios. Batteries happy, aircraft happy, Me happy!
Apr 22, 2010, 10:11 AM
Registered User
STANG KILLA SS's Avatar
great tip on the vertical test scott. little tidbits like that are so helpful to us mortals.
Apr 22, 2010, 12:02 PM
Registered User
Dennis C's Avatar
Again for those interested in getting the most out of the extra 330, or for that matter any of your planes

ever wonder why it pulls to the left on your verticle's or pulls to the right on an inside loop, but to the left when you fly it negative. or why you need down elevator when you set up to land, or why it is baloon's out of you down line before you get to the blender. Or why it rolls out at the top of your stall turn,



Get Scott's book on Mastering Radio Control, google for Peter Goldsmiths trimming tips, or find Chip Hyde's trimming secrets.

Better yet read them all. It is amazeing how much easier it is to fly a properly trimmed airplane. One tha does what you want, when you want it.

Trim it, Mix it and then fly it. You will be happy

Dennis
Apr 22, 2010, 07:35 PM
spitfire thunders superior
tuck's Avatar
Good advice
My flying skills improved tremindously from doing a bit of reading on flying techniques. I've just skimmed through setups and mixing.I should revisit those sections.
Zeb


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