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Cox Sky Cruisers Viper RC conversion build Babe_b10
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Cox Sky Cruisers Viper RC conversion build Empty
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Cox Sky Cruisers Viper RC conversion build

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Cox Sky Cruisers Viper RC conversion build Empty Cox Sky Cruisers Viper RC conversion build

Post  happydad on Mon Sep 10, 2012 7:48 pm

I have been waiting for parts for the Cox Gravity Warbirds F4-U Corsair build so i will start the conversion of the Cox Sky Cruiser Viper freeflight plane to 2/3 channel RC.
my original idea was to try to fit the RC equipment i already had into the small foam plane and live with the consequences. i soon realized the consequences were a non-flying piece of overweight junk.
you may have seen other modifications of similar planes from the cox sky cruisers series as they made several models. my favorite was the P-40 or the P-51. the Viper looks like a P-51, except with a purple fuselage and a yellow wing and elevator assembly. this modification will follow the format of the Cox Gravity Warbirds F4-U Corsair i started last week.

as with the F4-U Corsair it is easier to start with the easiest parts first.
first the Viper elevator stabilizer before modification.
Cox Sky Cruisers Viper RC conversion build Coxsky10

next the elevator stab with control horn marked in proper location. abrade area around horn top and bottom.
Cox Sky Cruisers Viper RC conversion build Coxsky11

next install control horn and glue.
Cox Sky Cruisers Viper RC conversion build Coxsky12

cutoff extra control horn on opposite side and carefully heat rod with soldering iron tip.

set asside for now

Viper rudder assembly before modification.
Cox Sky Cruisers Viper RC conversion build Coxsky13

Viper rudder assembly with control horn hole marked and abraded.
Cox Sky Cruisers Viper RC conversion build Coxsky18

Viper rudder assembly with control horn glued in.
Cox Sky Cruisers Viper RC conversion build Coxsky15

cutoff extra control horn on backside and carefully heat with soldering iron tip.
Cox Sky Cruisers Viper RC conversion build Coxsky16

that's all for now. untill the other parts come in.


edited 9-12-12 10:26p.m. PST

I have a few minutes to update the Cox sky cruiser Viper conversion so i thought i would finish the elevator assembly first.

When last seen the elevator assembly looked something like this:
Cox Sky Cruisers Viper RC conversion build Coxsky19

Place the elevator assembly on the fuselage, view from the bottom and draw a pair of lines allowing clearance of the moveable part of the elevator to avoid touching the fuselage.
Cox Sky Cruisers Viper RC conversion build Coxsky21

Cut the moveable part of the elevator along these lines. The elevator assembly should look like this with each part of the moveable elevator loose and moveable on its own. We will fix this later.
Cox Sky Cruisers Viper RC conversion build Coxsky22

Place elevator assembly on the fuselage again and view from the bottom. This time note the interference between the moveable elevator and the rudder and rudder control horn. mark the moveable elevator for clearance and carefully cutoff the foam piece as noted. The elevator assembly should now look like this:

Cox Sky Cruisers Viper RC conversion build Coxsky24

Make sure that the moveable elevator part of the elevator assembly clears the rudder and rudder control horn on both sides of the rudder. More next time. and we'll also figure out how to make both moveable elevator surfaces move at the same time.

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Last edited by happydad on Thu Sep 13, 2012 12:38 am; edited 1 time in total (Reason for editing : added another section)
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Cox Sky Cruisers Viper RC conversion build Empty re: Cox sky cruiser Viper RC modification

Post  happydad on Wed Oct 10, 2012 11:30 pm

Sorry for the long delay between posts. volunteer work can take up a lot of time.
when last seen the Viper elevator assembly looked like this:
Cox Sky Cruisers Viper RC conversion build Coxsky25

we still need to connect the 2 pieces of the elevator so they move together.
   Mark 2 holes on elevator parts to add a “U” wire for the elevator pieces to work together.
Cox Sky Cruisers Viper RC conversion build Vipere10

Press a small pin into the elevator pieces approximately 1/2inch for the “U” wire.
Cox Sky Cruisers Viper RC conversion build Vipere11

Form a “U” wire to fit between the two holes.  Make a small notch in the elevator edge for the round wire to fit into. Abrade ends of piano wire so CA glue will adhere better. Add “U” wire to elevator, put wire into pin holes in 2 places for U wire. CA glue in place making sure both elevator surfaces are flat and even with each other. Add CA glue into holes and into slot so the wire does not stick out and interfere with the elevator movement.
** Be sure the "U" wire is inserted parallel to the moving elevator surface and does not penetrate the elevator surfaces **

Cox Sky Cruisers Viper RC conversion build Coxsky26

Place elevator assembly again on fuselage, add rudder temporarily and  temporarily and mark on fuselage where the control wires will enter the fuse for both rudder and elevator. Cut thin long cutouts for the control wire tubes to lay into the fuselage without bending too much. Cut control wires about 1/2inch longer than needed to reach the position of the appropriate servo, previously mounted in fuselage.

Cox Sky Cruisers Viper RC conversion build Coxsky27

Let's look at the wing and the wing re-inforcements next. this is one wing half with the plastic wing re-inforcement removed.
Cox Sky Cruisers Viper RC conversion build Coxsky28


Place small graphite rod on one half of the wing and put a drop of foam safe CA on it to hold in place. I used .040 rod. Press the rod firmly down into the slot from the old wing stiffener and place one or 2 dots of foam safe glue on top and around the sides of the rod to hold it in place. Make a dam at the center of the wing half with paper tape to keep epoxy from running over the end, mix a medium size batch of epoxy thoroughly and add to the space between the graphite rod and the wing slot. Use just enough epoxy to come even with the bottom side of the wing, (NOTE: wing is now upside down). Let the epoxy harden. The wing should now look like this.

Cox Sky Cruisers Viper RC conversion build Coxsky30

that's all i have time for right now. we still need to mount the elevator and rudder assemblies onto the fuselage and figure out exactly where tthe servos need to sit to have the correct CG for this small plane. hd  Small Cox Logo

Futaba Radio   RC Plane


Last edited by happydad on Sat Jul 12, 2014 6:48 pm; edited 1 time in total (Reason for editing : to clarify how to add the)
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Cox Sky Cruisers Viper RC conversion build Empty Re: Cox Sky Cruisers Viper RC conversion build

Post  Cribbs74 on Thu Oct 11, 2012 8:41 am

Coming along HD, what size servo's?

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Cox Sky Cruisers Viper RC conversion build Empty Re: Cox Sky Cruisers Viper RC conversion build

Post  happydad on Thu Oct 11, 2012 12:24 pm

cribbs74 wrote:Coming along HD, what size servo's?

thanks for the feedback Ron. the servos are 3.7gram. plenty of torque for this small plane. about $3.00 in 4x quantity from China. i had to wait 3 1/2 weeks this time. normally only 10 days. hd Small Cox Logo

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Post  microflitedude on Thu Oct 11, 2012 1:29 pm

I may have missed it, but is this glow or electric?
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Cox Sky Cruisers Viper RC conversion build Empty re: Viper conversion

Post  happydad on Thu Oct 11, 2012 3:39 pm

microflitedude wrote:I may have missed it, but is this glow or electric?

the Cox Sky Cruiser Viper was originally an electric free-flight and i am converting it to a 3 channel RC electric plane. elevator, rudder and speed control. the Cox Warbird F4-U Corsair i'm not sure what it was originally, but i am converting it also to 3 channel RC electric. both planes come with a small electric motor capable of flying the plane and doing many stunts. some guys on other forums have converted these planes using brushless motors and the planes are much faster and capable of more 3D stunts.
here's a pic of tenative layout of the charge connector, receiver/ESC, servos and motor in the fuselage.
Cox Sky Cruisers Viper RC conversion build Coxsky31

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