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Author Topic: Combat to Carrier  (Read 2916 times)

Offline john vlna

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Combat to Carrier
« on: March 25, 2013, 07:09:21 PM »
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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Joe Just

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Re: Combat to Carrier
« Reply #1 on: March 25, 2013, 07:26:43 PM »
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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Offline john vlna

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Re: Combat to Carrier
« Reply #2 on: March 25, 2013, 07:36:06 PM »
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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Offline john vlna

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Re: Combat to Carrier
« Reply #3 on: March 25, 2013, 07:51:05 PM »
joe
the attached picture shows the way to mount a servo.
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Joe Just

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Re: Combat to Carrier
« Reply #4 on: March 26, 2013, 09:28:18 AM »
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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Offline Mark Scarborough

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Re: Combat to Carrier
« Reply #5 on: March 26, 2013, 05:47:40 PM »
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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Joe Just

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Re: Combat to Carrier
« Reply #6 on: March 26, 2013, 06:59:18 PM »
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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Offline Mike Anderson

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Re: Combat to Carrier
« Reply #7 on: March 27, 2013, 09:26:32 AM »
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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Mike@   AMA 10086
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Offline john vlna

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Re: Combat to Carrier
« Reply #8 on: March 27, 2013, 10:23:51 AM »
If you go electric you don't need servos.
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Joe Just

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Re: Combat to Carrier
« Reply #9 on: March 27, 2013, 02:06:03 PM »
Quote from: Mike Anderson on March 27, 2013, 09:26:32 AM
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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Offline Mark Scarborough

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Re: Combat to Carrier
« Reply #10 on: March 27, 2013, 03:14:12 PM »
 D>K H^^
Quote from: john vlna on March 27, 2013, 10:23:51 AM
If you go electric you don't need servos.
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For years the rat race had me going around in circles, Now I do it for fun!
EXILED IN PULLMAN WA
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Offline Mark Scarborough

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Re: Combat to Carrier
« Reply #11 on: March 27, 2013, 03:16:31 PM »
Quote from: Joe  Just on March 27, 2013, 02:06:03 PM
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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For years the rat race had me going around in circles, Now I do it for fun!
EXILED IN PULLMAN WA
AMA 842137

Offline bill bischoff

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Re: Combat to Carrier
« Reply #12 on: March 27, 2013, 08:22:28 PM »
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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Joe Just

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Re: Combat to Carrier
« Reply #13 on: March 28, 2013, 09:04:44 AM »
Bill, could you provide a picture or two for perusal?
Joe
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Offline don Burke

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Re: Combat to Carrier
« Reply #14 on: March 28, 2013, 01:13:44 PM »
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don Burke AMA 843
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Joe Just

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Re: Combat to Carrier
« Reply #15 on: March 28, 2013, 01:50:14 PM »
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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Offline don Burke

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Re: Combat to Carrier
« Reply #16 on: March 28, 2013, 04:17:13 PM »
Quote from: Joe  Just on March 28, 2013, 01:50:14 PM
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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don Burke AMA 843
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Offline bill bischoff

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Re: Combat to Carrier
« Reply #17 on: March 28, 2013, 07:33:33 PM »
Disregard the cut off servo lead. Here is a way you could mount a servo flat against the fuselage.
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