Which leadout is up?

[steven yampolsky]

Doe it matter which leadout is positioned in front of the other? Is it the up line that's forward or is is the down line? Does it matter? Is there a difference in handling?

[john e. holliday]

With the line spacing at the tip of 1 1/2 inches or less I don't think it matters unless you are of the caliber of the top pilots of this great country.   Now on the planes in which the spacing was 2 or more inches it would cause the plane to yaw one way or the other.  But, what did I know back then.  I just flew them or tried to fly them.

[Randy Powell]

I prefer the down line in the front. Give a bit extra yaw on outside maneuvers to counteract GP.

[Tim Wescott]

I prefer the down line in the front. Give a bit extra yaw on outside maneuvers to counteract GP.

Oh, that's why you gave away that Banshee.

[Reptoid]

I prefer the down line in the front. Give a bit extra yaw on outside maneuvers to counteract GP.

Actually that's backwards if you're trying to counteract GP ....but hey, whatever works for you

[Randy Cuberly]

Actually that's backwards if you're trying to counteract GP ....but hey, whatever works for you

Well I guess it depends on which way you want the GP to work for you...insides or outsides.  however most experts seem to prefer the up line in front.
If the leadouts are spaced about 1/2 to 3/4 inches apart it probably doesn't make much difference.

On most airplanes I've flown it didn't seem to make any difference.

I use the front for up because that's supposed to be the COOL way to do it and my hero Ted says that's the way it should be.   

Randy Cuberly

[Garf]

There are a few planes like the Veco Thunderbird that use "apex" leadouts, over/under. One of the fliers at my field has a plane set up that way.

[Avaiojet]

There are a few planes like the Veco Thunderbird that use "apex" leadouts, over/under. One of the fliers at my field has a plane set up that way.

Garf,

Myself and others did this in the late 50's and early 60's with many of our models.

Still an easy .5" apart but were never adjustible.

I'm thinking of closing up that .5" some and having an over and under adjustible leadout. A test for one of the stunt models I'll build at the end of  this year. One of my 1214 projects.

God willing.

Charles

[Reptoid]

Sometimes a simple search of this forum does wonders
There's a whole thread on this subject here:

http://stunthanger.com/smf/index.php?topic=28113.0

[Randy Powell]

Of course, Paul Walker long since convinced me to have independently adjustable leadouts. Makes a difference.

[Avaiojet]

I don't know?

One would think both leadouts exiting from the same adjustible single hole?

I could be totally wrong!

Charles

[Randy Cuberly]

Of course, Paul Walker long since convinced me to have independently adjustable leadouts. Makes a difference.

Uhhhhh Yeah...but what does that have to do with which one exits in front??    

Besides...compared to Charles, what does Paul Walker know...

Randy Cuberly

[Steve Helmick]

From the conversations I've overheard, the answer depends on if the model flies CW or CCW, and if the propeller rotates LH or RH. 

[Igor Burger]

I don't know?

One would think both leadouts exiting from the same adjustible single hole?

I could be totally wrong!

Charles

yes, that is how we do indoors :- ))

[Igor Burger]

From the conversations I've overheard, the answer depends on if the model flies CW or CCW, and if the propeller rotates LH or RH. 

:- ))) yes ... and also if you use Rabe rudder or not.

usually (I fly only tractors) I have down line front. It stabilizes model. Reverse (up line front) can act against precession, but it has tendency to hunting.

Pusher prop will make it just opposite.

Rabe rudder can change it if its deflection os overdone. (or cancel if something is wrong)

So for me - I have independent LO guid, so I can reverse it, and test what is better, but on 90% model I have down line front. When it is done, I set rabe rudder efect that it tracks well. and later I trim only by rudder offset (that permanent) and I do not touch LO anymore.

[Valentin Apostolov]

I made some of my models with above/under LO  but adjustable. It is possible. Like it
The distance is 1/2 ". The "above" is UP.

Valentin Apostolov

[Igor Burger]

I made some of my models with above/under LO  but adjustable. It is possible. Like it
The distance is 1/2 ". The "above" is UP.

Valentin Apostolov

but such solution makes asymetric roll, which is impossible (ok ok ... not so easy) to compensate by flaps (or anything else I know)

[Clancy Arnold]

I will just refer you to the January 2013 issue of Control Line World magazine page 64 for my reply.
Clancy

[Steve Helmick]

I will just refer you to the January 2013 issue of Control Line World magazine page 64 for my reply.
Clancy

Thanks, Clancy. You can look up my reply in my HS Yearbook.  Steve

[Chris Wilson]

yes, that is how we do indoors :- ))

Or monoline.

[Brett Buck]

but such solution makes asymetric roll, which is impossible (ok ok ... not so easy) to compensate by flaps (or anything else I know)

     Well, to be fair, no one is actually trimming well enough to tell the difference of 1/2" at the wingtip in the first place.

    Brett

[Igor Burger]

in that case that "no one" not need to think which should be up 

[Phil Hawkins]

When flying over grass I like the down line in front... if it snags, the plane noses down and maybe does not get destroyed... if it shoots up and in it's a goner... Yeah learned this the hard way. Of course this does not give a real answer to your question, just what I did on scratch build non-flapped profiles while flying at the Jr. High soccer field.

[Jim Thomerson]

Pm a 1/2A size airplane I have the leadouts out one hole.  With 1/2 inch separation there is yaw when control is applied.  On a bigger airplane I go 1/2-3/4 inch and it works to suit me.

[Brett Buck]

in that case that "no one" not need to think which should be up 

    Hey, how about that?

    Brett

[Dennis Moritz]

What happens when airplane is inverted. Are effects reversed.  Seems to me they are. Since up line is now down line and the reverse. Come to think of it, when doing the figures, nearly equal time is spent on your back as on your belly. Equally so for transitions. Same time transitioning to on your back as transitioning to on your belly. If up line/down line choice, does have a noticeable effect on yaw, it would probably be best to maximize the positive effect when flying inverted. Since it is, by itself, a judged maneuver. Take off/climbing to level flight/level flight is a combination maneuver.