I'm having to redo the pull-pull system for rudder and elevator on a .40 size plane and a 16lb giant scale plane.
Can I use fishing line for the pull-pull wires or do I have to buy pull-pull wire from a hobby shop?
If I can use fishing line, what pound should I use for the .40 size plane and what pound for the 16lb giant scale plane?
Thanks in advance.

Dont use fishing line.

Spider line at the local fishing supply store...60lb flavor (ala kevlar fishing line)

Ripcord or Fire Line up to 100lb flavor... same, kevlar..

Too much streach in fishing line. Not good!!!!

I use fishing line all the time in all my big birds for both rudder and elevator pull-pull. I use nylon coated braided steel line. For most uses, 30 pound test is fine but I also use 60 pound test with no problems. No, it doesn't stretch, one of my planes, a 16 pound Phaeton 90 with a Quadra 72cc engine is over 7 years old and still going strong, no stretch, no failures. I have also used the clear nylon leader material in a 1/4 scale club expecting that there would be stretch over time. Surprisingly, after 2 years of use, it was still in good shape with no apparent stretch. Note, that IMHO most guys using pull-pull set up their line way to taunt. Works best with just enough tension to not come off the pulley (I use a large pulley near the servo connected to the servo with a short 4-40 hardware and rod). Geometry at the surface end is important, make sure the attachment points of the line is directly in line with the hinge. You can get by with the attachments slightly aft of the hinge line but NEVER ahead of the hinge line as the line will tighten excessively at extreme throw.

Thanks I didn't know that. I'm sure if you'd use some type with a stranded wire core it would work fine.

How about fuel tanks, since you have good answers????

I haven't done it yet but has anyone done a timed test to see how long it will run at high speed to determine how many ounces per minute?

I figured that if I knew the maximum time I have on a certain size tank then when normal flying i'd know when to come down.

I'd like to get 20 to 25 min on a flight.

I'm thinking about a 24 oz tank?

Any problems with running the Zenoah G26 for that long?

Thanks for the help,

Rick Taggart, AMA 23715, IMAA 26601
[email protected]

No experience with the Zenoah, but my US 35 ( I know, overweight and under powered but it was cheep.... they say the same thing about me ) would easily get 20-25 minutes.

I actually time all my engines on the ground at full throttle, then use a kitchen timer, and subtract a couple of minutes for safety, and I don't usually fly at full throttle for the whole flight.... another little margin of safety. I like to have at least 1/4 tank when I land...... big birds cost way too much, and I make way too little to lose one to running out of gas at an inopportune time.

My two cents.

Bob

What size fuel tank do you have in it?

Did you keep the results of the tests you did?

Thanks,

Rick Taggart

You should do well with a 16 oz. tank. Even running at full throttle you will get about a minute per oz. or more. I can run over 15 minutes easily with a Quadra 72cc and a 16 oz. tank.

Great, I'll use a 24 oz in case I want to stay up for a while.

Thanks again,

Rick Taggart, AMA 23715, IMAA 26601
[email protected]