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Old Feb 15, 2013, 05:47 AM
3DeltaFly is online now
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Byron C
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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.
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Old Feb 15, 2013, 10:05 AM
rcbirk21 is offline
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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
Old Feb 15, 2013, 10:22 AM
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Last edited by aero104; Mar 14, 2013 at 02:03 PM.
Old Feb 15, 2013, 11:22 AM
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Byron C
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Originally Posted by aero104 View Post
Excellent info, especially that dealing with the effect of precession.
Old Feb 15, 2013, 07:31 PM
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inverted-i-fly
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very helpful, thank for the help
Old Feb 15, 2013, 08:42 PM
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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....
Old Feb 15, 2013, 08:45 PM
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Team 3DHS / Team JR
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Old Feb 16, 2013, 12:17 AM
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Old Feb 16, 2013, 12:22 AM
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inverted-i-fly
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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
Old Feb 16, 2013, 12:53 AM
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Old Feb 16, 2013, 09:56 AM
rcbirk21 is offline
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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
Old Feb 17, 2013, 11:27 AM
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FoamyFactory.com
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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
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Old Feb 17, 2013, 06:02 PM
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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
Old Feb 17, 2013, 06:54 PM
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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
Old Feb 18, 2013, 11:55 AM
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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?


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