I want to convert one of my R/C G Scale planes to C/L.
It is an F4U with a 30cc Homelite engine in it for scale
comp,. What is the best way to set up all servo's in this
plane?? I need some help here!
Thank you.
PS. Or did I post in the wrong Forum? 
Interesting question. Are you planning on flying this in competition? If so, there may be a few problems. But I will first have to admit my ignorance of the 30cc Homelite engine. If this is a two-cycle engine, the AMA rules allow the maximum displacement for each engine for control line scale to be 1.35 cu in. which is roughly 22.1cc. The AMA scale rules do allow a maximum displacement for each four-cycle engine of 2.70 cu in or 44.2cc. So, if that Homelite is a 4-cycle engine, it can be flown in competition. If a 2-stroke, it cannot be flown in competition. Depending on the weight of your Corsair, it will have a pull test from 5 to 8 G's to a maximum pull test from 55 to 80 pounds.
If you are planning to fly this in competition, there are some other considerations. Minimum line diameters are .024 in for single strand 2 line systems, or .020 in for single strand 3 line systems or .027 in for multi-strand systems. (Two line multi-strand lines are not specified.) Also remember that there is a 70 foot line length limit.
Even if you are not planning to fly this in competition, there are still some practical matters to take into consideration. That 30cc engine is over 1.8 cu in. That is a lot of machinery to be flown in a control line environment, even if super long lines are being considered. (And long lines, like 80 to 100 feet would have their own inherent problems. It can be done, but extreme care must be taken to avoid the lines snagging something on the ground during the takeoff and low flight at low speeds. Then at any speed, you are going to have a lot of pull on those lines. I still have vivid memories of Earl Carpenter flying his magnificent Lockheed Electra. I believe it had 4 ST 29's. (A total displacement of about 1.2 cu in.) He had his handle strapped to his arm. He also had a harness around his shoulders with a helper holding on to straps on his back to keep him from being pulled literally across the circle. Granted, with proper wing loading, the model you might be contemplating might not have a high lap speed. But you are still talking about a lot of machinery on the end of your control lines. These are some things you should consider before you get too far into your project.
The AMA rules mentioned above apply to Precision scale as well as sport scale. There is a real possibility that the Control Line Precision scale event may be eliminated from the AMA rulebook in this rules change cycle. The final vote by the Scale Contest Board is to be completed by June 15. If the Precision Scale event is eliminated, it is contemplated that the FAI control line scale rules will be used at our AMA contests. FAI Control Line Scale rules allow significantly larger total displacement, far beyond any practical limit for any control line application.
Topic: R/C Giant Scale Conversion to C/L (Read 1903 times)
