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Scratch Build Twin

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G-JIMG27/03/2020 16:26:40
158 forum posts
120 photos


Being an avid model maker, and having retired from being an Aerospace Chief Engineer, I have decided it's time to build a scale model of the last aircraft I was responsible for, a military conversion of the King Air 350.

There are no kits available for the King Air, so this will be a scratch build at 1/10th scale. The main driver behind the choice of scale is the availability of stock parts such as wheels and 4-bladed prop spinners. At 1/10th scale they both equate to a convenient 2" diameter.. Also, the King Air's 4 bladed props scale down to 10.5", which is achievable by trimming down an 11" APC prop, with the added advantage that trimming allows for the correct tip profile.

At this scale the model will have a 69.5" wing span, so I will build the wing in two halves and then permanently join them. Also, although I am a dyed in the wool petrol head, this will be my first excursion into the world of electric motors and LiPo batteries.

G-JIMG27/03/2020 16:35:58
158 forum posts
120 photos

OK, lets begin.

First, I printed out some plan and side view images and scaled them to 1/10th. I then worked out where the Ribs and Frames needed to be and their respective profiles.

0 plans.jpg

G-JIMG27/03/2020 16:39:13
158 forum posts
120 photos

A couple of years ago Santa brought me a Stepcraft CNC machine, so drawing the Ribs, etc. using the supplied CAD package is the hardest part - cutting them out is a doddle.

1 wing rib drawing.jpg

2 wing ribs cnc.jpg

G-JIMG27/03/2020 16:43:42
158 forum posts
120 photos

CNC machine doing its thing.

3 cnc cutting..jpg

G-JIMG27/03/2020 16:45:01
158 forum posts
120 photos

First set of wing ribs ready for the build.

4 set of wing ribs.jpg

JohnP2527/03/2020 18:16:27
107 forum posts
3 photos

A pack of ribs like that and no sign of a blade or sandpaper? Got to be cheating going on here.

G-JIMG you make it look so easy, I'm quite impressed at both your kit and skill.


john stones 1 Moderator27/03/2020 19:11:40
11969 forum posts
1531 photos

Good looking choice Jim, and something different. yes

eflightray27/03/2020 20:06:50
625 forum posts
132 photos

Do you also have a robot that will build and fly the model for you wink

How things have changed from a single sided razor blade and a piece of sandpaper.


G-JIMG28/03/2020 12:09:56
158 forum posts
120 photos

I'm certain there will be a fair amount of manual cutting and sanding later in the build!

However, for now I have continued to 'cheat' and have drawn up the fuselage and nacelle frames and put them through the CNC machine. (If you've conned your way onto Santa's good list, make the most of it I say!).

20 fuselage frames.jpg

G-JIMG29/03/2020 11:04:55
158 forum posts
120 photos

Now the majority of the parts are designed and cut I can start on the build.

Started with the Starboard Wing, building it directly over the plan in the traditional way.

5 wing build (1).jpg

Edited By G-JIMG on 29/03/2020 11:05:32

G-JIMG30/03/2020 11:21:46
158 forum posts
120 photos

Given the lack of response to this build I assume there's little or no interest in it. That being the case I'll stop posting now.


Steve Houghton 130/03/2020 11:30:45
1943 forum posts
129 photos

I'm following laugh

Nigel R30/03/2020 11:35:16
4453 forum posts
717 photos

keep posting, we're watching yes

different way of handling the pods than I have seen anywhere else

Edited By Nigel R on 30/03/2020 11:36:30

simon barr30/03/2020 11:39:29
1066 forum posts
16 photos

Yup, I'm lurking and watching.

Keep up the good work!

Denis Watkins30/03/2020 12:00:17
4702 forum posts
135 photos

400 views in this short time is above average for Forum Posts

Am lurking too, as twins interest is all

Caveman30/03/2020 12:01:21
334 forum posts
245 photos

I'm watching with interest. I'm a knife and sandpaper type, but love to see alternative methods of doing things. I'm also jealous of your ability with CAD etc!

Do keep posting.


Mark Elen30/03/2020 12:20:08
530 forum posts
1022 photos

I'm following too. My next build will be a twin so am interested how you are approaching this.



Nick Somerville30/03/2020 12:28:41
205 forum posts
111 photos

Yes please keep posting. Good to see the CAD CNC route in action.

I flew to King George Island from Punta Arenas in a King Air 300 some years back. It’s about a 4 1/2 - 5hr flight with the point of no return 10 minutes from the island. A radio call to the Chilean base that operates the landing strip is made 20 minutes prior to eta to check conditions and if too windy to land the plane turns back to Punta Arenas. Thankfully our flight was good to land, otherwise thats nearly 10 hours flying with no toilet on board 😱. The top tip prior to our flight was ‘don’t drink anything until on terra firma’.

Colin Hooper30/03/2020 13:22:10
48 forum posts
21 photos

Another lurker here. Having built a twin which I am still flying (well was) I am keen to follow your progress.

Chris Walby30/03/2020 13:35:33
1468 forum posts
399 photos

G-JIMG, just because people are not replying is no indication that people are not interested.

As a youngster I was told if you have nothing to add then don't open your mouth (or type) and I think there is nothing worse that people chipping in off topic for pages and pages that other at a later date have to plough through.

Watching with interest

PS Mod feel free to delete this as IMHO its off topic

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