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Speed,Combat,Scale,Racing => Carrier => Topic started by: john vlna on March 25, 2013, 07:09:21 PM
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Back in 1965 and 67 Nick Ziroli designed and published two models called the Combat Zero and P-38 in FM magazine. Both used the same wing and really aren't full up combat models. In or about 1980 my brother and I built both. I gave my p-38 away a few years ago, but still have the zero.
I have been converting my old glow models to electric, and although I realize many could care less about electric, but I thought it might be of some interest to see how easy it is to convert to electric.
My goal is to make this old sport combat to 15 carrier. It has about 280 sq in and a 40 inch span. It was built light since we were flying combat remember, so with a competitive motor and battery it will still be under 30oz RTF. The setup shown in the pictures is 24oz.
The current motor is a 480-1020kv, 9x7 Top Flite wood, 3 cell battery. With this combo it is a good sport plane.
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John, Fascinating! Not for me just yet, but I do have a question. I have been told that using Velcro to hold a throttle servo in place wont work. Your thoughts Please.
Joe
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Joe,
I don't think Velcro should be used either. a servo needs to exert force on the throttle arm. Velcro would allow to much slop. Cut a square hole in the fusalage and screw or glue the servo in like the RC guys do.
John
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joe
the attached picture shows the way to mount a servo.
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Thanks John. I will change my idea of using Velcro. See attached picture showing how I placed the servo on my Wildcats. Now I will consider using the same method on my Tigercat.
Joe
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Joe, two screws,, not one buddy,, good practice for mounting dictates if the servo has two holes, you use two screws,,
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Mark, Two reasons for just one screw. One, I could not figure a way to get the leadout out of the way. Two, the servo is glued in with water baised grout like rubber like glue.
Joe
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If the servo is glued in, be very careful about matching the servo throw to the carb arm throw -- if there is too much servo movement, you will be straining the gears at one end or the other of the throttle movement. Those cheap servos will strip a gear pretty easily.
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If you go electric you don't need servos.
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If the servo is glued in, be very careful about matching the servo throw to the carb arm throw -- if there is too much servo movement, you will be straining the gears at one end or the other of the throttle movement. Those cheap servos will strip a gear pretty easily.
Thanks mike, that is something I have already been told and the servo travel is very free, with no strain at all. On my new Tigercat the servos are held in place with aluminum straps and sheet metal screws on a raised wood surface. Becuse I have had no experience with R/C it has been a real learning experience particularly with mounting a throttle servo on a flat surface like a profile. Pictures coming in a couple of days (hopefully!)
Joe
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D>K H^^
If you go electric you don't need servos.
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Thanks mike, that is something I have already been told and the servo travel is very free, with no strain at all. On my new Tigercat the servos are held in place with aluminum straps and sheet metal screws on a raised wood surface. Becuse I have had no experience with R/C it has been a real learning experience particularly with mounting a throttle servo on a flat surface like a profile. Pictures coming in a couple of days (hopefully!)
Joe
Joe,
you know I have some RC experience,, and I answer my phone whenever you call, dont hesitate, ( its a good excuse to catch up anyway),, Hope all is well in your home Joe
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Hey Joe, "L" shaped nylon control horns make nifty servo mounts. They typically come as left and right mirror images. I suppose the regular "T" style horns would work too.
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Bill, could you provide a picture or two for perusal?
Joe
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Bill, could you provide a picture or two for perusal?
Joe
Looks like a good idea to me.
http://www3.towerhobbies.com/cgi-bin/wti0095p?FVPROFIL=&FVSEARCH=dubro+%3Cb%3Econtrol%3C%2Fb%3E+%3Cb%3Ehorn%3C%2Fb%3Es+nylon
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I still need a picture of how 2 control horns can be used to support a servo on a profile fuselage. Impeding senility on my part I'm sure!
Joe
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I still need a picture of how 2 control horns can be used to support a servo on a profile fuselage. Impeding senility on my part I'm sure!
Joe
use the horns with the pushrod holes facing each other, the bases screwed to the side of the fuselage. Put the self-tapping servo screws in the pushrod holes.
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Disregard the cut off servo lead. Here is a way you could mount a servo flat against the fuselage.