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Member postings for Paul Johnson 4

Here is a list of all the postings Paul Johnson 4 has made in our forums. Click on a thread name to jump to the thread.

Thread: Warbirds Replicas P51 Mustang
20/12/2020 18:45:04

Okay now I know a lot of you have received your kits... so who's done what?

20/12/2020 18:42:21

But before we cover the 'covering'..

I had to wait for a good dust mask too turn up as after covid was told to avoid fumes, dust etc as still got a few problems due to it.

Anyway managed to sand the wing tips and leading edges of the wing... boy what a mess..surprise

Good job I waited for that mask...

wing tips and le sanded.jpg

Also put in those rib supports that my kit needed after removing a lot of wood where the flap torsion bar was a pain.

You should not have this problem as the production models were corrected.

rib supports.jpg


Next started planking the top of the wing and servo box, left room to be able to connect and sort out the links.

rib servo tray being sheeted.jpg

job done..

top of servo tray complete.jpg

Now just got finish the bottom skin and the front locating dowels, fill in the dinks and cover the wing.


Edited By Paul Johnson 4 on 20/12/2020 18:43:37

13/12/2020 15:23:14

Well a quick update. Tried the temp setting at 100°c and found this a lot better. No where near as many wrinkles or creases.

Will take some picts and post on it soon

09/12/2020 19:00:27

When you were a lad a servo was a 'downstairs' member of staff.....

Them boys needed keeping in line... Jeeves sort that upstart out.

09/12/2020 18:27:00

no massive progress but the flap servos are fitted. This is a information only picture as the other models will have a different arrangement. As I have used 2 servos I needed to reverse one. Doable with these particular servos but as the motor terminals are soldered to the control board took a bit of work. But hey good job I am an electronics engineer by trade...wink

I put a how to on the 109 forum if anyone needs to reference that, but there are guides all over the web as well.

flap servos in.jpg

I feel the screws in the torsion bars will loosen over time as the wood compresses so a little epoxy might not go adrift here.

30/11/2020 12:32:09
Posted by Graham R on 29/11/2020 16:13:14:

Hi Paul,

Good to see another convert to laminating film. The only problem I have found is that it's not too good going round things like wing tips. One big advantage as well as its strength is that it doesn't stick to itself unlike other films.

Perhaps Ron can advise us. When I bought mine a few years ago I could only get 70 microns which I feel is a tiny bit heavy. What thickness is yours Ron?.

Hi Graham,

It's 38 micron which is 1.5 thou in old money.

29/11/2020 13:25:05

After covering a flap it was time to undertake the challenge of fitting it in place.

Now whilst contemplating my navel I thought of an idea and it turned out a reasonably easy fit.

First remove a small piece from the rib to allow access.

remove for flap fitting.jpg

Glue torsion bar into flap and allow to dry fully.

glue torsion bar.jpg

Make sure that the hinge material is only a fraction longer than the torsion bar as it's a tight squeeze if you leave it too long.

Drop the flap in and align the hinges with your pre-cut slots you already made.

drop flap into place.jpg

Push home, Pin and glue... job done!


flap fitted and pinned.jpg

The plate for the flap servo is DIFFERENT from the production models as previously mentioned but I wanted to share this solution for the flaps as it allows gluing the torsion bar in without risk of getting glue everywhere and having the flaps glued solid. I will 'patch' the material removed and post that later.

29/11/2020 13:06:29

A big thanks to Ron for sending me a sample of the covering method he uses, laminate film, so first a test.

laminate tests.jpg

It goes on a treat and to test adhesion pulled a piece off and as you can see it stripped a layer of balsa with it showing how well it is fixed in place. it also fits curves very well.

The thing that impressed me was the increased strength it added to the balsa. I am going to cover this model in it.

Again thanks Ron.

29/11/2020 13:00:14

Servos fitted with ply blocks, this is just my little way of fitting them, for the bish bash boshers out there you could also hot glue them in cheeky.

servo wing.jpg

29/11/2020 12:55:55

Hey progress.....

Well the second wing is at the same build level..

Time to join them.

But before you do you will need to trim the main spar brace at the front as this will foul the sheeting in the wheel well.

main spare trim.jpg

You need to reduce the length of these by about 4 mm.

wheel well obstruction.jpg

And now the joining...

We are gathered here today..... oopps wrong type of joining

wing joining.jpg

25/11/2020 10:12:06

Those Polish pilots had one saying..... repeat please..... repeat please....

Daga daga daga.....

23/11/2020 17:56:17
Posted by Eric Robson on 23/11/2020 15:39:13:

Be patient Martian and get on with the Cat, I am itching to start on mine but I am going to finish the Seafury first . Progress is slow as I can't shake off this head cold I have had for over a week

That's no head cold it's new model fever...cheeky

23/11/2020 09:14:01

Hi Gordon,

That is a good motor, I have one in a slightly larger air frame. It is a bit physically bigger than the FMS one but will do the job, obviously you will have to check all the alignment of motor to cowl etc as you go. The motor also has a shaft which extends rearwards when you fit the prop adapter, this is removed using a dremel on mine. This will protrude into the battery box if you don't remove it. The FMS one does not have this shaft sticking out the back.

22/11/2020 18:23:23

HI Gordon,

Provided you follow the build and the manual you will have no problems. Just take your time, check it twice before you cut anything.

Anything you aren't sure of ask on here.

Edited By Paul Johnson 4 on 22/11/2020 18:24:56

22/11/2020 16:58:57
Posted by Glynn on 19/11/2020 22:19:54:

Those spinners are a work of Art.

Well I have met the 'Boys' on many an occasion but have never seen ART.... cousin?

Well while you lucky lads who have been sniffing the contents of your 'Labelled' boxes trying to find room on the cluttered workbench.

I have been slaving away trying to get the left wing to the same point as the right.

I have to finish lining the wheel well and then glue the wing tip on.

lw progress 1.jpg

The old lump of expanded polystyrene helps to lower the 'dings' in the sheeting.

Just had to take a couple more pictures of the flaps as they are really worth the time and effort .

lw flap1.jpg

I mean come on guys don't they look sexy....!

lw flap2.jpg

17/11/2020 18:37:51

I can see Nigel right now... laughing like Dick Dastardly's dog Muttly.

17/11/2020 18:24:32

Damn it guys will you lot shuddup about box labels...

Rolled plans.... box labels... na nany na na...

16/11/2020 12:33:34

Look out... Richard's loose with a hammer..!

15/11/2020 15:56:54

Offered up the two wing halves and found you will need to trim the lower spar to aid assembly other wise it fouls on the skin.

main spare trim.jpg

15/11/2020 13:35:26

Hey now Kickapoo would have been just right...

Renown for kicking the shite out of the enemy ...

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