70 foot line length

Hey guys, In another post the statement that 70' line length "...from center of plane to center of handle. As specified in rules.." might solve a line tension problem. I've heard this quote before but I can't find it in the rule book. My impression is that 70' line lenght (max) IN STUNT is eyelet to eyelet.

In the speed and combat events the measurement is from CL to CL because of the type of competion. But in stunt, this isn't an issue and the rule book states "..As per chart" The chart says 25 to 70 feet LINE LENGTH. How about a clarification here from some other judges.

John,

Nice try to find a way to use something longer than the maximum 70 foot lines, center of the handle to centerline of the model. The rulebook is very clear on this.

The "Control Line, General" section of the rule book provides for the "Size, Construction and Measurement of Control Lines" in Paragraph 5 which states that the "Length, diameter, and types of lines permitted are stated under the specific rules for each event." In Paragraph 5.2: "The length of the control line(s) is measured from the center point of the grip part of the contol handle (device) to the fore and aft centerline of the model."

There is nothing in the rulebook that even suggests that these requirements in the General Control Line section do not apply to the Precision Aerobatic event.

Seems pretty darn clear to me!

Darn!! You guys beat me to it.

I knew that one! Steve

Ok, here's a question on getting proper line length:

Assuming 28" wing halfspan 4" leadouts and a hardpoint handle, how long can the line be? 70' - 2'4" - 4" = 67'4"? How much do .018's stretch? Can I assume 4" stretch and just cut the lines at exactly 67"?

They might stretch that much, but the bow in the lines will take up that amount of stretch, so cut them at 67' 4". this is just a suggestion, not a command. They're your lines.

Wow, lines that stretch 4 "! This must be the ones that you can feel
stretch during flight mentioned in previous threads. Pull testing lines has never produced more than the slightest lengthening that I could detect. I must have wrongly attributed the stretch to straightening the little kinks out of the cable.

Note I said "might", and I really doubt they stretch more than 1/4". Also any stretch would not be noticable due to the line sweep or bow due to air friction and drag (air friction).

Thanks, Keith and others who responded. I had looked but obviously not close enough. That's that. Thanks again.

I have never seen a set of stunt lines measured at a contest. In CL racing you are allowed + or - 6". Just use markers on the ground and lay the handle at one marker and the airplane at the other, no stretching involved.

They always measure them at the Nats. It's a good stunt contest.

They never measured mine fo length at any of the nats that I attended. They did measure Diameter though.
Bigiron

> They never measured mine fo length at any of the nats that
>I attended. They did measure Diameter though.

At the stunt circle, they have tape on the ground with the 70's marked on it, right in the pull-test lane. They spot-check the diameter.

Not many people are all that close to the edge.

Brett.

>They always measure them at the Nats. It's a good stunt
>contest.

The NW CL Regionals is coming up. We could arrange to measure the length of Howard's lines for each flight. Would measuring the diameter every 2" be good enough? Maybe then Howard would say the NW CL Regionals was also a good stunt contest. Steve

Dang. All that money for thick-at-the-ends lines wasted.

I think most stunt flyers know that anything over 70 is taking a real big chance on clipping something just outside the circle, your field may be OK but if you attend any contests or fun-flys you are asking for a missing outboard wing.

Be carefull at Brodaks on anything over 64.

Edit: Didn't mean you can't fly 70's at Brodaks just stay pretty close to the center of the circle.

"In CL racing you are allowed + or - 6". "
Hi Jim
Are you sure it isn't minus zero plus 6" for racing?

All racing events except 1/2A show 60' + - 6". 1/2A mouse 1 is 42' 0" to 42' 6" and mouse II is shown as 47'6" with no plus or minus.

Bigiron (read the book, it helps)

How long is your arm?
How long is your outboarrd wing?
Ive seen alot of planes flying out of the circle because this wasn,t factored in during the planning of the circle.
I,ve seen people hit. It ain,t pleasant.

>Can I assume 4" stretch and just
>cut the lines at exactly 67"?

67"? I dunno.. remember the 18" "stonehenge" in the Spinal Tap movie?

Hi John,
Over the years I have seen the results of fliers who did not understand the rule, and cut their lines at 70" eye to eye.
They couldn't stay in the middle of the pilot's circle because they would be off the asphalt!
Made it interesting on some landings and take offs.
(difference of about three feet on a full size stunt ship)
Bill <><