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HelicopterScale Model RC Helicopters › MCPX /H-13 scale build
11-20-2011 04:05 PM  6 years agoPost 1

rrElite Veteran

Mesa AZ. USA

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I have recieved many emails and requests to show how I did this so here goes..Please enjoy and try one!! They are easy to build, and fly great!!

First off, you need to go to your favorite hobby supplier and get an Eflite Blade MCPX helicopter. (I've just been told they are reducing the prices on these also!!)
Now, while you are still shopping go ahead and snag a Revell 1/35 scale model of their "H-13H 2n1" plastic kit(part no. 85-5313).
Grab a little plastic cement, some acc, maybe a few hobby paints etc. and we're good to go;

First, I would recommend getting the heli set-up in your tx done first, and make sure it flys ok for you. Mine was great out of the box using their settings..with that out of the way let's open the box and get building...

If you don't have some "Sprue cutting pliers" I highly recommend you get some. These tiny plastic parts want to self distruct if you attempt to remove them from their sprues any other way!!
Anyway.go ahead and cut out the tail rotor protector and the tail boom assys.

Now, carefully, unplug the tail motor wires from the "board" on the MCPX and working the boom slowly remove it from the frame. You should end up with the motor,boom, wires and plug all intact. The nice thing here is that Eflite has color dotted the sero/motor plugs so you can't re-install them backwards!! Also, while you still have the MCPX out, remove the landing gear/battery box. (and of course you won't need the canopy) Do not discard the landing gear assy!!

I used a set of dial indicating calipers here but any way you want to do this is fine..... grab the tail rotor and gently pull it off the motor shaft. (Watch the orientation so you get it back on the same way). Now measure the bearing housing on the tail motor and enlarge the hole in the revell tail scag, so that it will fit over the motor housing under the rotor.

That's it for the tail rotor for now.. set this aside.

Next, locate and remove from the sprues the tail boom assy. This is where the beauty of this kitbash comes to light!!
Hold the boom in your fingers and turn it over so you can see the bottom of the "Webbing". as in the second photo I showed you. here you will see a small mounting tab with a pin coming out of it...

Here's what we need to do to prep the frame for the mechanics mounting;

Remove all the webbing/framing from the bottom of the kit part but leave the "tab" I referred to in the last statement.


The next step is to open up/provide a hole for the MCPX frame to sit into the revell frame. You are going to mount the MCPX to 3 points on the revell frame. None of these require you to glue the two of these together... (This is the beauty of this any time you can remove the MCPX and put it back together as a pod and boom!!!)*

Drill or ream out the inside of the tab that we retained in the previous step to fit the forward mounting lug on the MCPX landin gear.
This is the part on the frame of the MCPX (there are two of them) that protrude from the bottom of the frame.
next, find the two small "Pockets" that are the mounting points for the Revell "Scale" engine. What we want to do here is find two small pieces plastic and "cap" the openings they have for the scale engine.
I used a few pieces I found on the sprues.. but you could also use some plastuct/styrene strips. just be sure they are well attached as this is going to be your "motor mounts" for the helicopter!! After the glue has set-up completely, Measure the mount lugs for the canopy on the MCPX. Using a drill of equivelent size (or a tiny bit larger)drill out the opening to the side of the "motor mounts" that you just made with the plastic "caps"...
You should end up with your frame resembeling this;

It is not necessary to have a "precision" fit on the lower mount hole.. but try to keep it tight side to side.

Now you can test fit the mechanics... simply pry open the frame sides (gently) and let the canopy lugs slip into the frame mounts as the lower landing gear lug slides into the hole in the bottom....

You should end up with this;

Remove the mechanics and set them aside for now...

Let's mount the tail...

Go ahead and glue the tail frame assy (that you opened up the mount hole in the beginning steps) to the main frame. after that has dried turn the frame so you can see the top of the boom and cut a small notch. This is to provide clearance for the MCPX boom tube to fit into the Revell frame. it should resemble this when done;

Take the MCPX boom and carefully guide the plug and wires through the frame. Slip the motor into the tail scag and attach it with a dab of ACC or hot glue (be carefull not to get any glue into the bearing of the motor shaft). Slid the MCPX boom down the bottom of the Frame and again, either hot glue or ACC the boom to the frame. Make adjustments to assure the tail rotor aligns with the frame as you do this.
It should be ready to go now;

So, go ahead and replace the tail rotor blades, mount the mechanics, and plug the motor back into the board.

All that is left now, is to finish the model and get flying!!!!

Home of the "Sea Cobra".....

11-20-2011 04:55 PM  6 years agoPost 2

rrElite Veteran

Mesa AZ. USA

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On to finishing....

Let's start with the skids;
Go ahead and assemble the landing gear to the frame as instructed in the Revell plans. You will see that the "scale" landing gear is pretty flimsy.. but not to worry... there is a plan here...

Now, take the MCPX landing gear/battery moount and clip off the landing gear portion. This will leave you with the battery box and two lugs for attaching to the MCPX frame. Simply plug in the battery mount as you would flying a pod and boom with the battery access point to the rear of the heli. Now..if you set the whole thing down you will see that the scale gear and the battery box are providing support for the helicopter. This takes a lot of the stress off of that tiny scale gear...!! so,if you don't slam it into the ground side ways it will survive a hard landing... (Ask me how I know?)
One aside here.. I would buy 2 of the Revell kits... They are cheap and you WILL need parts sooner or later...?

One other note... Be sure to check the clearance of the servo gears with the side struts on the Revell frame. I had to shave them a bit on one frame but not so much on another.. just be sure they are not touching the gears on the servo motors!!

This gets you to a point where the helicopter is flight ready... it is a bit on the tail heavy side. You "Could" fly it like this if you just couldn't wait!! I would recommend that you wait....

But let's continue...
I know some guys have taken the board off and reconfigured the whole MCPX mechs. But, I prefer, to leave it all together and I have found this unnecessary.
To mount the cabin you first need to remove the entire back of the shell. Clean it out good so that all that is left is the perimeter cockpit. You can leave the floor in but you will need to cut the seats forward. (I really tried to have enoough room to add a pilot but this just isn't possible.) You can add the instrument panel and rudder pedals etc. (and in fact it really looks cool when the MCPX board lights them up!!) don't put the "bubble" on yet... this will be one of the last things to do.

Go back to the Revell kit and locate parts no.70. These are small struts designed to mount the gun package but we are going to use them for the cabin.

If you trimmed the cockpit properly you can now work it over the MCPX board and slip it down into position on the lower forward frame. glue it in place (note; I added a couple of small styrene re-inforcement tabs at this lower area to help support the landing gear and cabin to the frame.
Now take those two struts (Part no.70) and glue them to the frame from the upper mount lugs to the cabin. This will complete the cabin assy to frame work.

That's it folks... all that is left is to add some details..
I added the tail elevator (it does not mess with the CG) and fuel tanks. a few decals from the kit, paint.. and you are good to go!!

Charge the battery and listen for the "Mash" theme as Radar yells;


I hope you all find this as easy and fun build as I did...

Thnks for viewing..


Home of the "Sea Cobra".....

11-20-2011 07:10 PM  6 years agoPost 3

rrElite Veteran

Palos Verdes, Ca. USA

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Awesome build thread on this cool little heli! Thanks for taking the time to lay it all out step by step Nice work! I may have to build one of these gems for flying around the house.

All helis and planes have an expiration date stamped on only find it after you crash!!

11-20-2011 09:30 PM  6 years agoPost 4


Port Charlotte, FL

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Very nice!!

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11-20-2011 09:42 PM  6 years agoPost 5


Crystal Lake, Illinois, USA

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Nice job Jim.

"Pay attention...lest the ground rise up and smite thee."

11-20-2011 10:33 PM  6 years agoPost 6

rrElite Veteran

Golden Gulf Coast - USA

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Awesome thread. The Chinglish majors should hire you to do their instruction manuals.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF

11-21-2011 01:42 AM  6 years agoPost 7

rrElite Veteran

Mesa AZ. USA

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Thanks Guys....always great to spread a lil Holiday cheer!!!

"Chinglish"?? I love that!!!!

Home of the "Sea Cobra".....

11-21-2011 01:17 PM  6 years agoPost 8


Sherwood, Arkansas

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Perfect Info!
Jim thanks for taking the time to post your kit bash! My MCPX should arrive today, and I will be visiting the lhs later today too. This is just too cool of a conversion not to have!
Thanks again. A little "holiday" cheer is good anytime!

AMA 2918-Team JR, Spin Blades,,Castle Creations, Unique Aircraft

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HelicopterScale Model RC Helicopters › MCPX /H-13 scale build
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