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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Approach Engineering "Whiskey" Cobra build..
02-18-2016 02:31 PM  4 years ago
Dr.Tim

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Mojave Desert

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Polycrylic works the best! It's a water based Wood Floor sealer. Simply cut your cloth to fit and wet it down with it! Cleans up with hot water and NO Nasty fumes!From Simple minds come simple ideas! Approach Engineering
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02-18-2016 02:51 PM  4 years ago
Keygrigger

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Mississauga, Ont. Canada

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Great build, Jim. That looks like a great kit, Tim. Hope it flies off the shelf.

Don
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02-18-2016 03:15 PM  4 years ago
coptercptn

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Mesa AZ. USA

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Yes, I will be covering with "Minwax Polycric" and .7 oz cloth....cheap, easy, and as Dr. Tim noted water cleanup with not much smell. I also do a filler coat (before final sanding) where I mix the poly with baby powder.. This adds body to fill any weave, and also really smells good when you sand it!!! 🤗🤗🤗Home of the "Sea Cobra".....
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02-18-2016 03:50 PM  4 years ago
GyroFreak

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Orlando Florida ...28N 81W

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I'm following, love the details you are posting.I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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02-19-2016 05:37 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Work on the tail drive and control cable today... I began by fabricating some support brackets for the cable tubing.
This needs to be well supported and if you save the cutouts from some of the formers, they are perfect for that!

After the tubing is secured, I moved on to building in the control cable. Everything here is based on using the Align torque tube mechanics and tail rotor system. If you elect to use something else then you will have to do your own engineering.
Here, I mounted the tail gearbox and used it to align the hole I drilled for the cable. After that it is a simple matter of routing the cable though the hull up to where you want the servo.

It is very important that you support this cable every 6-8 inches!! If you don't , the cable will flex under toque and you will lose tail control or at best have a very spongy tail...
Again, here I used scrap pieces of ply from the cutouts.
In the rear of the engine bay, behind the mechs I glued in a servo box ( yes made from more scrap ply 😎)
Next it was just a matter of threading in some rod and a couple of ball links, and it's done!!!! 👍

The rest of the day was spent sheeting the tail pylon and building the engine pods...

Next is going to be modifications to the kit. I have discovered a problem and will show how I solved it...
I also changed up the sequence on some of the build steps and I will elaborate on how and why I felt this necessary.....😱😱😱.

Stay tuned
Home of the "Sea Cobra".....
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02-19-2016 07:03 AM  4 years ago
goodhunting

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Slovenia ... somewhere in Europe

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man you're on fire...

gh
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02-19-2016 02:57 PM  4 years ago
GyroFreak

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Orlando Florida ...28N 81W

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The pictures are great showing construction details.
The pictures will help you also if for some reason you have to make change or repairs when the chopper is complete.
Might want to add small wires for any LED nav lights you may want to add later.
I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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02-20-2016 12:42 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Yes, before I close it all up I will have the wiring run for lighting and details...Home of the "Sea Cobra".....
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02-20-2016 01:07 AM  4 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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looking great Jim!
Might want to add small wires for any LED nav lights you may want to add later
Great advice! but this isn't Jim's first rodeo
drive a rotary, fly a rotorcraft
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02-21-2016 08:12 PM  4 years ago
eyefly3d

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magnolia tx

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Jim, if you don't mind me asking, what ratio are you mixing the baby powder with the poly? I'm approaching that stage on my cobra build and have been glassing using the poly.

Chris
I don't always fly helis, but when I do I prefer to fly scale.
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02-22-2016 12:09 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Hey Chris... Well I really don't have a formula for that... I just dump it in until it starts to have a "creamy" consistency.. You don't want it too thick but it needs to have enough in it to fill weave/voids...Home of the "Sea Cobra".....
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02-22-2016 12:19 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Ok, "Teaser" time;

Now that you see where it's at, I'll take you through this part of the journey...
This is where I had to "jump ship" a bit and deviate from the plan because..well, you'll see.
Home of the "Sea Cobra".....
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02-22-2016 12:37 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Here's where everything started to get interesting.... I'm not sure how the designers had planned to incorporate a flex drive off of any mechanics? The main issue being the aft doghouse is built around a center panel that ends up being smack in the middle of where the cable needs to go!!!
So, what I did was cut out the center area and add some reinforcements to the structure...

With this part removed now the cable can slip up inside...
Very important as this assembly will permanently glued to the upper engine pods and be removable for maintenance.

Once it was all glued up, the whole thing is really sturdy!!! So, no harm, no foul...
Home of the "Sea Cobra".....
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02-22-2016 12:50 AM  4 years ago
Thumper217

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Slidell, LA - USA

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💎Sustaining Member
Wow you're really cruising along on this one Jim. It looks good and I really appreciate all the detailed build photos, lots of good techniques and information. Thanks.

Andrew
Thumper
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02-22-2016 12:54 AM  4 years ago
coptercptn

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Mesa AZ. USA

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Ok, I did skip over an area I wanted to mention...
In the building of the engine pods, the instructions go into quite a bit of detail about "planking" the sides of the pods.. Even to the point of making a tool to strip the balsa for angled joints...
Well I got looking at that and thinking about how all of this is going to be "glassed" anyway ???
So I figured sheeting would be just as good and a whole lot easier and quicker..I ended up using 1/16 balsa sheeting.

Starting from the center, I used my favorite bottle of "windex" and lightly moistened the cut sheet. Then working from the middle proceeded to glue each edge bending the balsa gently.
It went quite well and I ended up with only two seams...

This is just how I decided to finish this part... Your mileage may vary....
Home of the "Sea Cobra".....
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02-22-2016 01:05 AM  4 years ago
coptercptn

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Mesa AZ. USA

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The next part of the build would be to attach the cast resin intakes and exhausts to the structure... But, because I will be glassing this I have decided to add Those details after I do that. What I did do was to temporarily ca these and fit them.

The top here is wrap a piece of sand paper around the resin part, and carefully sand away until you have a uniform clearance around the part.
I used the plastic model here for reference.

Add a little spackle to fill the seams and voids... And "Whallah" !!! Ready for glassing
Home of the "Sea Cobra".....
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02-22-2016 02:24 AM  4 years ago
Dr.Tim

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Mojave Desert

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Those are some great Ideas Jim .. Do you mind if I add them to the manual?From Simple minds come simple ideas! Approach Engineering
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02-22-2016 04:33 PM  4 years ago
eyefly3d

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magnolia tx

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Thanks Jim, I'll give it a shot. Looking great so far.

Chris
I don't always fly helis, but when I do I prefer to fly scale.
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02-22-2016 04:41 PM  4 years ago
coptercptn

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Mesa AZ. USA

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Of course Tim, that's what this is all about...Home of the "Sea Cobra".....
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02-22-2016 04:50 PM  4 years ago
Dr.Tim

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Mojave Desert

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Thank you!! This IS the First Production kit.
A few mistakes were made and the files have been updated.
We do our best to put out a quality kit and with your help I think we are there!

Thank you again!
From Simple minds come simple ideas! Approach Engineering
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Approach Engineering "Whiskey" Cobra build..
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