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Building Brian Taylors Cessna 120

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Dwain Dibley.03/04/2019 23:22:28
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1268 forum posts
1267 photos

Hey McG, How you doin buddy ??

I Have built the rear fuselage this evening, it was straight forward enough once the sides were cut out. I simply lined up the LHS on the plan, made sure it was upright at 90 degrees to the bench, lined up the formers and tacked them on, again making sure they were upright. Once all five were on, I used the laser cut rear fuz spacers to line up side two, dropped a rule along the front edges to check for square and tacked the formers on the RHS.

D.D.

This shows how the difference in the sheeting size and the subsequent extra width in the formers, all came good

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All Five Formers.

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The rear fuselage built up as described above. Notice the triangular spacers in the tail area.

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Nice and square.

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The obligatory mock up... cheeky

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Edited By Dwain Dibley. on 03/04/2019 23:34:26

maurice northcott04/04/2019 10:53:12
96 forum posts
63 photos

Looking good Dwain ........ keep at it

mo

Dwain Dibley.04/04/2019 11:04:55
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1268 forum posts
1267 photos

Thanks Mo......laugh

I am going to the LMS in a bit to buy some things. Then it's thinking cap on to sort out the battery access. I am going to fit an isolator, this allows the ESC to be almost anywhere.

D.D.

Edited By Dwain Dibley. on 04/04/2019 11:06:13

Dwain Dibley.04/04/2019 20:15:05
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1268 forum posts
1267 photos

Well the trip to LMS was a success, I got 90% of what I went for.

The undercarriage is proving difficult to buy, I can only find .40 size, which although the model is designed around a .30, is not wide enough.

Still, I got wood, Glue and Wheels......laugh

D.D.

The first job was to cut a groove for the window ply.

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Nice new wood.

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Next I added the top sheeting formers. These left exactly 3/32 each side for the sheeting.....Phew....smile d

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Next I checked the fit of the tail plane. All was well.

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Next came the little side cheeks (number 2), and some 1/16 ply facing pieces.

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Next was the undercarriage plate, even tho I don't have the legs. I also fitted the cowl fixing blocks. I added a balsa spacer for better adhesion on 2 sides and have since faced the outer face with balsa.

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I felt a little reinforcement was needed.

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Obvious.

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I made a servo tray out of light ply, and made it removable.

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C.A. in the screw holes, this sets the thread like concrete. As you can see I added wider rails.

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The servo position looking from underneath, through what will be the battery hatch, this should allow for some detail in the cabin.Ignore the connector it is just on the servo arm from a previous incarnation. Next I need to make 2, maybe 3, more bottom formers and construct the hatch. I line it all with 1/32 ply to allow a smooth fit and it will be held with magnets.

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Edited By Dwain Dibley. on 04/04/2019 20:19:27

Dwain Dibley.05/04/2019 16:58:32
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1268 forum posts
1267 photos

I have a fuselage Boys...... laugh

It's a bit fiddly to get the rear end on, the way I did it was to make the 4 triangle braces from 1/4 sheet. I made sure they fitted nice and snug and attached them to the rear of former 5. This made it easy to attach the rear fuz to the front bit when it was standing on its nose. Remember to add the packing piece to take the angled former as the rear fuz butts up to this.

Anyway its all nice and straight considering there is no jig, and no real way to use one.

D.D.

The four Braces.

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Below you can see the extra 4 formers I made from 3/16 balsa sheet. The two end ones that will form the hatch will be ply faced, so they slide in and out easily. The middle one is attached to the ply laser cut one supplied in the kit. The one on the left is now fixed to former 4a to form a fixing point for the side sheeting.

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The hatch pieces.

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I marked centre point on formers and checked for square.

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Formers 5a and 5b going in, these are laminated.

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The bottom 1/4 square stringer in place.

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Dwain Dibley.05/04/2019 17:04:18
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1268 forum posts
1267 photos

Here is the scrap seating piece, that could cause mayhem if you miss it out, as it drops the rear fuz by about 6mm. I put the bevel on the support, I thought it was easier than planing the skinny former. frownlaugh

D.D.

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Danny Fenton05/04/2019 17:36:50
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9317 forum posts
4125 photos

Looking good DD

Cheers

Danny

maurice northcott05/04/2019 18:02:04
96 forum posts
63 photos

yes Great stuff Dwain

mo

Ray Wood 405/04/2019 20:17:27
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159 forum posts
34 photos

Good job Dwain,

I love building B T designs,this one looks especially appealing, I better order the plan & bits 😀I

You could cut holes in most of the internals to lighten her up, without losing the strength.

Regards Ray

Dwain Dibley.05/04/2019 22:15:48
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1268 forum posts
1267 photos

Thanks Guys........ laugh

That's a good idea Ray, especially in the tail plane area.

I have fashioned the hatch, needs a bit of work but OK so far. I added some side cheeks to take the Magnets.

D.D.

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barryt05/04/2019 23:25:52
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64 forum posts
19 photos

Great work Dwain. You are a quick builder. I'm enjoying the pictures, reminding me of my own build some years ago. Yes, losing some weight from the fuselage now will pay off later when the flying starts.

Dwain Dibley.05/04/2019 23:56:05
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1268 forum posts
1267 photos

Thanks Barry,

As the weight has been mentioned a few times, I put her on the scales. Figure is in grams, which equates to just over 12 oz.

D.D.

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Dwain Dibley.06/04/2019 13:20:48
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1268 forum posts
1267 photos

This morning I was wondering how to get some ply onto the bottom of the hatch. Normally when you do a built up balsa cowl or hatch you can incorporate the ply as you build up the layers and then sand it all down in one go.

In this case the thing is at a set height governed by the laser cut bits.

So......I whacked the thing on the belt sander until I had space for the 1/16th ply base. It would be easy to go too far here, and get all out of square, but I did good and it all still fits. I added some lugs so nothing moves side ways, here the trick is to get the base of the hatch the same width as the fuselage rails. The magnets can be recessed into the ply and I normally use countersunk screws in the fuselage rails, shown here on the Moth.

D.D.

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The 120 Hatch.

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Edited By Dwain Dibley. on 06/04/2019 13:24:25

cymaz06/04/2019 16:48:16
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9004 forum posts
1187 photos

Great concise write up and lovely clear pictures yes

Dwain Dibley.07/04/2019 14:28:05
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1268 forum posts
1267 photos

Thanks Cymaz. laugh

Had a think about what Barryt said about cooling, and there is no way out for hot air once all the sheeting is on, so I cut a hole in the bottom of the tank floor, and added another battery tray which is also level with the formers, to avoid battery snagging. I will still have to cut a hole in the exterior sheeting. I will also scope out some more of the former at the back, as a 4 cell lipo only just scrapes in through the hole.

D.D.

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Edited By Dwain Dibley. on 07/04/2019 14:29:00

Dwain Dibley.07/04/2019 17:15:11
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1268 forum posts
1267 photos

Been studying the tail wheel assembly, and made the wooden support. I have some bits of metal, the big bit is door plate for the long wheel support and the other bit is brass for the control arms. A bit of wire and some solder and Bob's yer Uncle. surprise

D.D.

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Dwain Dibley.07/04/2019 18:12:44
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1268 forum posts
1267 photos

Servos and New Radio coming tomorrow..............................Exciting stuff.......

Plus I need to get some snakes.......one of the things I forgot on the trip to LMS last week.

D.D.

Martian07/04/2019 19:27:30
2368 forum posts
1108 photos

I love a Cessna great blog thanks dd

Dwain Dibley.09/04/2019 23:49:48
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1268 forum posts
1267 photos

Thanks Martian.... wink

Shiny stuff came.

D.D.

2 standard hitec HS 311's and two HS 255 BB mighty minis for the wing.

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New Radio. You won't lose this in the long grass boys......laugh

comes with a 12CH Rx and a telemetry module.

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cymaz10/04/2019 06:10:03
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9004 forum posts
1187 photos

smile d

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