Control Line Speed Chart

[Randy A. Dailey]

Can someone send me a chart for calculating C/l Planes on 60 ft lines in MPH.


     Thanks, Randy

[Bob Heywood]

Don't have a chart. The calculation is: Speed (mph) = 1799.28 / Time (in seconds for 7 laps)

[Paul Smith]

Bob is VERY correct.

But based on stopwatch & line measurement accuracy, seconds per half mile /1800 and seconds per mile / 3600 is close enough.

If you are into French measurement you can do seconds per kilometer / 3600 = KPH.
A kilometer is ten laps on 52' - 2 3/8" lines in the all-metric system.

[Bob Matiska]

Did anyone else buy one of these from the AMA way back in the 60's?

Bob in NEPA

[Tim Wescott]

Formatting is left as an exercise to the user.

[Steve Helmick]

The speed chart used to be a few pages of the AMA rulebook. You know, back when there was an AMA rulebook. Remember that?  Steve

[Randy A. Dailey]

I want to thank everyone for your help.
    This morning I flew a Spoiler Combat ship with a ST 35 Stunt engine with 10-6 prop as rich as it would run. This is the first time I have flown in over 40 yrs, and I thought it would never run out of fuel. Thought I would never stop stumbling around after I landed. After 30 minute sobering up (LOL), flew again and went for broke doing loops and figure 8's, same results after landing, legs feel like rubber after 8 hrs. Can't believe plane survived.

   Thanks, again
 
   PS: I'm sure I heard a Sonic boom!

[Tim Wescott]

I want to thank everyone for your help.
    This morning I flew a Spoiler Combat ship with a ST 35 Stunt engine with 10-6 prop as rich as it would run. This is the first time I have flown in over 40 yrs, and I thought it would never run out of fuel. Thought I would never stop stumbling around after I landed. After 30 minute sobering up (LOL), flew again and went for broke doing loops and figure 8's, same results after landing, legs feel like rubber after 8 hrs. Can't believe plane survived.

   Thanks, again
 
   PS: I'm sure I heard a Sonic boom!

If you have the plane for it, stand in one spot and do lazy 8's until your head stops spinning.  At times when I've been under the weather or have been laid off for a while, I've found that one or two laps of inverted will sometimes help.  OTOH, sometimes mixing inverted with upright flying just gets my inner ears so confused I don't know which way is up.

[Fred Cronenwett]

Had to challenge myself, I have the Excel spreadsheet that was used to make this PDF file if anyone is interested. Excel is great to make these kind of calculations

This reads like the old original chart the base number on the left and the decimal on the horizontal bar

Fred

[Steve Helmick]

From my days of flying combat (oh, so long ago!), I recalled that 18 seconds/7 laps = 100 mph. From my days of flying CL speed, I remember that 10 seconds flat was just a bit out of reach, but somewhere in the 10's is cookin'. 

Getting dizzy like that (with no hangover) is one of the great things about CL. Regarding the legs being like rubber, that's more to do with walking on a rough field and conditioning. Walk the dog more? Leg presses at the gym will really git 'er done.  Steve 

[Paul Smith]

The old PAPER AMA Rule Book was great.  Everybody got one every year and most carried on in their pit box.  None of this E-book burning and continuous revisionism.

The chart was used mostly be Speed people and sometimes Carrier.

Combat & Racing guys just memorized the key numbers:  24 = 75 MPH, 20 = 90 MPH, 17 is 105, 16 is 112.5 and the magic number: 15 = 120 MPH.

[Bob Matiska]

OK, boys and girls, here they are, pages 20 and 21 of the 1976/77 AMA rule book. I knew I kept it for a reason.

Yes, it only goes as slow as 25.9 seconds for half a mile, 69.23 mph, but it's a start.

Bob in NEPA

Added: The bottom of the Bill Johnson speed chart. Probably the most useful numbers for stunt flyers.

[Dane Martin]

Yes, it only goes as slow as 25.9 seconds for half a mile, 69.23 mph, but it's a start.

I've actually hit that number before..... 

[Steve Helmick]

 "None of this E-book burning and continuous revisionism."

Actually, the thing that really burned me up was that there were VERY OBVIOUS mistakes in the online posted stunt rules, but the AMA wouldn't fix it until the new rules were voted on. If one knew what the correct text should have been, then it would have taken something like 30 minutes (max) to fix.

If there had been a mistake in the printed rules, I could understand this better. But online, it's just a minor deal to fix it right. I guess it just wasn't important enough for the judges and CD's to know what the regulations were supposed to be?  Steve

[howard shenton]

This is a speed chart for most of the line lengths we use.
Base calculation is for 2 laps but can be changed to suit individual needs.
Line length is calculated from Finger side of the handle to the centerline of the model.
Was posted in the combat forum a while back.
More useful than the AMA chart .

[Jim Carter]

Had to challenge myself, I have the Excel spreadsheet that was used to make this PDF file if anyone is interested. Excel is great to make these kind of calculations

This reads like the old original chart the base number on the left and the decimal on the horizontal bar

Fred

Thanks Fred!  You're all right!