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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Approach Engineering "Whiskey" Cobra build..
02-16-2016 03:29 AM  4 years ago
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coptercptn

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Mesa AZ. USA

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Approach Engineering "Whiskey" Cobra build..
So, today I woke up and thought.."I got Wood"!!!!!! Now before all you ladies go and get all excited...(and I know you will)... My "Wood" is balsa, and light ply)!!!!!
Anyway... I have the Numero uno kit for the just released 700 size Cobra from Approach Engineering.. (Dr. Tim) to the rest of us..?
So, today I am starting the build on it and will do a complete build thread as "WE" all go through it.
Starting off, open the box and unpack the parts/separate the wood and components.

If anyone along this journey wants to offer advice or ask a question...please feel free to do so!!!
Home of the "Sea Cobra".....
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02-16-2016 03:39 AM  4 years ago
coptercptn

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Mesa AZ. USA

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This kit is all lazer cut, but you will find that you need to cut the pieces out with a sharp exacto knife... The tip here is to flip the sheet over and run the blade along the outline of each piece. This will complete what the lazer doesn't get and your parts will come off nice and clean..
Next is to gather each part needed for each step of the assembly. There is a complete instruction booklet that comes with the kit. I suggest you read through it at least twice to familiarize yourself with each step.
Home of the "Sea Cobra".....
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02-16-2016 03:52 AM  4 years ago
coptercptn

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I won't wast time going over each and every glue joint, but I will highlight the sub-assemblies and anything that may need to be called attention to.
The first sub assembly is the tail grouping

Here is the assembled pieces with the short section of (align) trex tail boom installed. This needs to hang out 1" from the last bulkhead to allow the tail rotor gearbox to be attached to it.
I should mention that I will be using a T-Rex 600 for mechanics with some KDE/700 upgrades.
I'm using various glues for this build, here I assembled the basic structure with CA, but installed the tubing with 30 minute epoxy for strength. You don't want that tube moving in flight!!!


This is the completed assembly with the tail gear box on for reference. If you plan to use something other than the Trex/clone, you will need to make those adjustments....
Home of the "Sea Cobra".....
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02-16-2016 04:07 AM  4 years ago
coptercptn

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Ok, the next step is to assemble the two sides, and form the basic box for the fuselage. All of this is pretty straightforward, but because this fuse ends up being 60" long... And it comes in a small box, you have to join the side (3) sections and add doublers. The fit and "engineering" here is quite good! (And easy) 👍

After you build both sides, there is a center "box" that joins the halves, this also is where the mechanics are mounted... Part of this assembly is to glue in the mounting blocks.. I opted not to glue these in at this point and prefer to wait until the fuse is formed completely. My logic here is that I can precisely mount my mechs then..? We'll see how that decision pans out??😱
Home of the "Sea Cobra".....
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02-16-2016 08:37 AM  4 years ago
sean911sc

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San Diego

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This build reminds me of the days of balsa glider builds or when fiberglass kits were few and between.William S Harris
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02-16-2016 10:50 AM  4 years ago
goodhunting

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Slovenia ... somewhere in Europe

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wohoo another AE beauty in the works...
subscribed...

gh
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02-16-2016 11:47 AM  4 years ago
doorman

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Sherwood, Arkansas

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Go Get'm!!
Jim, your having way too much fun!!!
Certainly lopks like it is going together nicely... will continue to follow!!!
Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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02-16-2016 01:41 PM  4 years ago
old nitroman

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Naples florida

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Now this is real scale build, reminds me of the old days, awesomeE5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx
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02-16-2016 03:55 PM  4 years ago
Pistol Pete

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Seffner, FL

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Love these builds...subscribed.~~Enjoying the hobby one flight at a time~~
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02-16-2016 06:22 PM  4 years ago
coptercptn

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Mesa AZ. USA

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Ok, further progress...
Today I started to finish the tail section of the fuse. As you pull the ends together just be sure it is all centered. I ran a long steel rule down the centerline and then "eyeballed" it while dry fitting the tail assembly.

After I was satisfied with the fit, I mixed up some epoxy and glued and clamped everything in place. This is also the time to double check that the tail is also aligned vertically!!! As once this cures, there's no going back!!!😱😱😱

Home of the "Sea Cobra".....
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02-16-2016 08:12 PM  4 years ago
coptercptn

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Mesa AZ. USA

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Now that the tail has cured up its time to finish up the bottom, the large ply bottom sheet goes in to lock it all together.. I really like the "brown" Gorrilla glue for this because of its strength and ability to fill any voids. It also allows good working time for fit,clamping, and alignment.
This part is really straightforward so I don't need to add any details here..
And, while the joints are setting up, this is a good time to sand and cleanup the rails and tail joints. There is no mention of doing this in the instructions... But I will play "Captain Obvious" here and mention it...
Oh, and it appears I need to make a short trip to "Harbor Freight " for a few more clamps!!!!

Home of the "Sea Cobra".....
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02-16-2016 10:10 PM  4 years ago
Musky

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Chicago ill

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Approach
Was also waiting to see the new kit with glass parts I like the size will stay posted
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02-17-2016 01:17 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Well, I decided to take a break from the building and do some checking and fitting. Not wanting to get ahead of myself I wanted to see if my "Donor" Trex was going to work!
As you may recall I opted not to glue in the mount blocks when the instructions called for that step. This turned out to be a good/bad decision.
Good, because if you don't mount your mechs to the blocks you have no idea where they need to be glued, plus.. Very difficult to put in T-nuts for the mount bolts.
Bad, because when you glue bulkheads F2 and F3 to the sides you no longer can squeeze the blocks in..
Needless to say I had to do a bit of "de-bonding" 😡!!
Here's the area of concern;

But, in the end, I was successfully able to get the blocks in and out and test fit the mechs....
Ahhh yes, the mechs. Well, my Trex Donor is an old 600 pro that I had in my "Sea Cobra" ( those of you that know that story will get a chuckle here 😁) So, anyway I drug them out and sat them on the mounts and placed the upper cowling fiberglass in place for reference;

They just looked way to tall, and the output for the tail drive meant I was going to have one "snaky" drive tube going out the back.....
So, back to the drawing board...(and Trex parts bin)
What I found was an old set of "lowered" side frames I had gotten when I was dealing wit TF Models many years ago. These things were a solid 1-3/4" lower than the pro frames!!!
So, I spent the rest of today transferring/building a new Trex. The end result I like very much and with everything in place i believe we have a winner!!!!!

Home of the "Sea Cobra".....
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02-17-2016 09:22 PM  4 years ago
coptercptn

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Mesa AZ. USA

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Today I was able to line up the mechanics and drill out the mount blocks. Then I epoxied some 4mm blind nuts and bolted the mechanics to the blocks... Next I placed the whole assembly into the fuse, and used a torque tube drive shaft and some reference marks, to assure alignment.
Glued it all together and clamped it up.
Next I formed the brass tubing for the tail drive and glued it into the tail tubing.

Next step is to sheet the bottom and secure the tube and make some braces and supports.
But basically the mechs are in !! 😁
Home of the "Sea Cobra".....
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02-18-2016 01:58 AM  4 years ago
rctrooper1

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Brownsville, Texas

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Very nice build! May I ask how you are linking the flex cable adaptor to the align drive gears?

Thank you
Jz
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02-18-2016 02:08 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Many years ago I built a "FunKey" 60 size Cobra ( the build thread is on here somewhere)...and, when I made the flex/cable drive for it, I made some adapters that allowed me to utilize the ends from the torque tube and attach them to the cable.
When I get to that stage in this build I will show in detail how to do it...but, here's a teaser👀

Home of the "Sea Cobra".....
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02-18-2016 02:12 AM  4 years ago
rctrooper1

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Brownsville, Texas

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Wow! Very impressive! Certainly subscribed!

Thank you for the info!

Jz
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02-18-2016 03:00 AM  4 years ago
old nitroman

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Naples florida

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Looking goodE5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx
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02-18-2016 07:03 AM  3 years ago
goodhunting

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Slovenia ... somewhere in Europe

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how do you intend to finish the fuselage?
will you cover it with epoxy or do you have any other ideas?

I am half way done covering my AH64 with epoxy and cloth... but somehow "lost momentum" to finish the process...

gh
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02-18-2016 01:29 PM  3 years ago
Mojave

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Palos Verdes, Ca. USA

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Wow Jim, you're unstoppable lately!! The project is coming along nicely. Those shorter side frames definitely did the trick.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Approach Engineering "Whiskey" Cobra build..
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