RC FW-190 Pull-pull control system

http://foamcasualty.com This is a pull pull system using upholstery thread and dental floss control horns. Very simple and very effective.

Category:

Howto & Style

Tags:

• RC
• FW-190
• FW190
• 190
• pull-pull
• control
• horn
• servo

[eszyman]

Well guys, there is no substitute for good old fashioned empirical testing, but I've run some calcs on this setup anyway. Assuming no friction the servo will stall at 1.6kg-cm translates back using a 1/4 control horn on a 1 inch aileron to almost 10 oz of force on the tip of the (maybe 1/2") foam aileron! Considering that the aircraft I put this 100% nylon upholstery thread on weigh under 50 oz, I think that is a reasonable expectation for the foam airframe and this setup.

[eszyman]

The main reason to run a pull - pull setup like this is that there is actually zero slop. In order to put 2 additional servos in the wings, it raises cost, weight, and I have to channel up my solid core wing to run the wires. The external run I admit would be better hidden away, but it does allow for easy inspection before flight.

[tisoy909]

why not just a servo in each wing for each aileron?

[glynamus]

well, i think its cool. sorta old school and new. love to see stuff work and this is a cowboy system that is way way cool. thanks for being creative in airplane building. nice breath of fresh air. those that have the money to fly are the lucky ones =)

[pencon61]

because as we all know the real FW190 had strings running outside it's wings to control the ailerons .The rest of your plane looks quite scale , so just bury a seperate servo on each side of the wing and be done with it .If you're gonna use pull /pull it should have been buried under the sheeting .

[slimquattro]

Never seen that done before.... Probably never see it done like that again either. To have it tight enough to get zero slop, will pull on the floss, constantly wearing it until it eventually snaps, and it will snap.

[RCGasserGuy1970]

Wow, I would NEVER allow setup like that on one of my birds...string? Really? Spend some money and install micro-servo, much more reliable. One gust while in a turn could cause total aileron failure...Too risky for me...

[tisoy909]

if weight is a concern on a warbird then you likely need a better motor. those elaborate linkages usually equal to slop in controls. you gotta be able to control it in order to fly it.

[heberorozco]

@tisoy909 more weight