SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Feb 15, 2013, 04:47 AM
Byron C
3DeltaFly's Avatar
United States, TN, Knoxville
Joined Apr 2011
715 Posts
Quote:
Originally Posted by Inverted-I-Fly View Post
got 6 more flights on mine today, glacier batteries are breaking in nicely, now at 12 cycles, and definitely putting out more power than they did when new. Plane flys fantastic, the only thing I'm having a bit of a problem adjusting to is the p-factor with the a60-6xs and 21x10, seems it wants yaw to the left in harrier so I find I need to hold a lot of right rudder and or aileron and it does it especially hard when getting on the throttle after doing a parachute. I need to try a 20x10 and see if it helps
Sounds great. I'm flying my 58 while working on the 74 "build"

I'll bet adding a few degrees of right thrust will help that left pulling that you're experiencing. Especially if it is pulling left during a vertical up-line, assuming everything else is in good trim of course. Changing props will affect the exact thrust angle needed, so I first find a prop I like and then tweak the thrust angle for that prop.
3DeltaFly is offline Find More Posts by 3DeltaFly
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 15, 2013, 09:05 AM
Barefoot Birkinsomething
rcbirk21's Avatar
United States, CA, Hayward
Joined Aug 2004
9,414 Posts
Quote:
Originally Posted by 3DeltaFly View Post
Sounds great. I'm flying my 58 while working on the 74 "build"

I'll bet adding a few degrees of right thrust will help that left pulling that you're experiencing. Especially if it is pulling left during a vertical up-line, assuming everything else is in good trim of course. Changing props will affect the exact thrust angle needed, so I first find a prop I like and then tweak the thrust angle for that prop.
i typically dont like adjusting thrust angle, especially on 3dhs planes since they are jig built. it will have nasty effects in other areas of flight from what i have experienced
rcbirk21 is offline Find More Posts by rcbirk21
RCG Plus Member
Latest blog entry: Joe's Battery Contraption
Reply With Quote
Old Feb 15, 2013, 09:22 AM
Support Your Local Hobby Shops
aero104's Avatar
Nashville, TN
Joined Feb 2005
748 Posts
...
aero104 is offline Find More Posts by aero104
Last edited by aero104; Mar 14, 2013 at 01:03 PM.
Reply With Quote
Old Feb 15, 2013, 10:22 AM
Byron C
3DeltaFly's Avatar
United States, TN, Knoxville
Joined Apr 2011
715 Posts
Quote:
Originally Posted by aero104 View Post
Excellent info, especially that dealing with the effect of precession.
3DeltaFly is offline Find More Posts by 3DeltaFly
Reply With Quote
Old Feb 15, 2013, 06:31 PM
inverted-i-fly
3drcparts's Avatar
United States, CA, Petaluma
Joined Mar 2011
4,330 Posts
very helpful, thank for the help
3drcparts is offline Find More Posts by 3drcparts
Reply With Quote
Old Feb 15, 2013, 07:42 PM
Team 3DHS / Team JR
Bivens's Avatar
United States, TN, Knoxville
Joined Apr 2010
4,424 Posts
Added right thrust for upright p-factor is the wrong direction for inverted p-factor....

Adding right thrust will make the inverted harrier require a LOT more left rudder, making low and slow inverted stuff really funky....
Bivens is offline Find More Posts by Bivens
RCG Plus Member
Old Feb 15, 2013, 07:45 PM
Team 3DHS / Team JR
Bivens's Avatar
United States, TN, Knoxville
Joined Apr 2010
4,424 Posts
Dbl post
Bivens is offline Find More Posts by Bivens
RCG Plus Member
Old Feb 15, 2013, 11:17 PM
Support Your Local Hobby Shops
aero104's Avatar
Nashville, TN
Joined Feb 2005
748 Posts
...
aero104 is offline Find More Posts by aero104
Last edited by aero104; Mar 14, 2013 at 01:02 PM.
Reply With Quote
Old Feb 15, 2013, 11:22 PM
inverted-i-fly
3drcparts's Avatar
United States, CA, Petaluma
Joined Mar 2011
4,330 Posts
Never had to adjust thrust angle on a 3dhs or EF plane, not going to start now, I'm getting used to it and will just fly it out, it's not like it is uncontrollable, it is just different than any other plane I fly
3drcparts is offline Find More Posts by 3drcparts
Reply With Quote
Old Feb 15, 2013, 11:53 PM
Support Your Local Hobby Shops
aero104's Avatar
Nashville, TN
Joined Feb 2005
748 Posts
...
aero104 is offline Find More Posts by aero104
Last edited by aero104; Mar 14, 2013 at 01:01 PM.
Reply With Quote
Old Feb 16, 2013, 08:56 AM
Barefoot Birkinsomething
rcbirk21's Avatar
United States, CA, Hayward
Joined Aug 2004
9,414 Posts
Quote:
Originally Posted by aero104 View Post
I just thought of something else. Prop diameter and prop weight.

Force = Mass x Arm

Gyroscopic Force Applied = Weight x Radius

So, to reduce the effects of gyroscopic precession, use a lighter prop (carbon fiber) or a shorter prop (reduce diameter, and/or go to 3-blade). Reducing the prop weight and/or the prop radius will reduce the adverse Forces applied to the plane.

Too much? :-)
thats very true, a smaller diameter will lessen the p-factor. but the problem is that a larger prop diameter will positively effect control in many attitudes of flight. so it is really battling the best of mix of the two for the specific pilot
rcbirk21 is offline Find More Posts by rcbirk21
RCG Plus Member
Latest blog entry: Joe's Battery Contraption
Reply With Quote
Old Feb 17, 2013, 10:27 AM
FoamyFactory.com
Tim H.'s Avatar
USA, TX, Fort Worth
Joined Nov 2001
4,344 Posts
Taped together for the "motivational" shot. Man this thing is COOL! Mine came with tons of decals, so I'm happy about that. I've been gathering all of the bits to start building. I have everything I need to get it in the air, however, new servos will be on the horizon. All I need to do now is make some servo extensions. I have 2 other foamies I'm working on simultaneously and I'll build the extensions for those 2 also. I bought a crimper, wire and male/female ends a while back, so now time to learn. I'll save myself 50-75 buck just in servo extensions by making my own.

I also have a vinyl cutter too so I'll be wracking my brain for graphic ideas. Any ideas, post them. Maybe I can come up with another vinyl "package"

Off to go clean the garage. "Clean" is a misnomer... It's TRASHED and that drives me nuts!

Cheers
Tim H. is offline Find More Posts by Tim H.
Reply With Quote
Old Feb 17, 2013, 05:02 PM
3D Addict
alfabeast's Avatar
Merrimac, MA
Joined Jan 2006
1,017 Posts
Quote:
Originally Posted by aero104 View Post
Agreed. Do NOT adjust thrust angle to correct for p-factor. Use your thumbs. No fancy computer radio mixes, either. ;-)

That's right. Right?
+1, brain + sticktime = mix
alfabeast is offline Find More Posts by alfabeast
Reply With Quote
Old Feb 17, 2013, 05:54 PM
Registered User
Dennis C's Avatar
Grass Valley California
Joined Jun 2004
2,469 Posts
Quote:
Originally Posted by aero104 View Post
Agreed. Do NOT adjust thrust angle to correct for p-factor. Use your thumbs. No fancy computer radio mixes, either. ;-)

That's right. Right?
Not exactly Most of the top aerobatic pilots use mixes and that includes throttle to rudder and even throttle to elevator.

Depending on how big a prop you use you may need more mix, do not change the right thrust on the motor mount.

My new 71" AJ Slick needs no throttle rudder mix, the 72" Extra has quite a bit.

Dennis
Dennis C is offline Find More Posts by Dennis C
Reply With Quote
Old Feb 18, 2013, 10:55 AM
Registered User
robj's Avatar
United States, LA, Moss Bluff
Joined Nov 2008
8,139 Posts
Quote:
Originally Posted by Dennis C View Post
My new 71" AJ Slick needs no throttle rudder mix, the 72" Extra has quite a bit.

Dennis
Throttle to rudder? As in more throttle you are adding rudder. Something must be wrong, mine fly straight no matter what.

How does that work in a hover?
robj is offline Find More Posts by robj
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion 60 inch edge 540 vs 48 inch extreme flight extra 300 & edge 540 vs 3dhs slick 51 & 59 CRFan1 3D Flying 40 Mar 04, 2012 02:45 PM
Sold 3DHS 41" Edge 540 PNP $225 gonzoman5 Aircraft - Electric - Airplanes (FS/W) 10 Oct 05, 2011 10:53 AM
Wanted 3dhs Edge 540 47" (red bull scheme) SmokeDogg Aircraft - Electric - Airplanes (FS/W) 13 Sep 29, 2011 02:19 PM
Wanted 3DHS Edge 540 47" (Red Bull Scheme) SmokeDogg Aircraft - Electric - Airplanes (FS/W) 0 Sep 24, 2011 01:58 AM
Wanted 3dhs edge 540 47" (red bull scheme) vhuang168 Aircraft - Electric - Airplanes (FS/W) 2 Sep 08, 2011 10:13 PM