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Marutaka Ju87B

Stevo finally gets on the case

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Stevo25/06/2017 10:23:18
2699 forum posts
419 photos

Enough procrastination. No excuses with the back, although it's still a bit crook. A lot of guitar repairs and builds have come in, (it's on my FB page. Shameless plug). Whinge... procrastinate..

To the matter in hand. One Marutaka Stuka (87B) enlarged 8%, for a 100FS. Those plans aint easy are they??!! Extrapolation of the ribs and formers... almost no construction notes, thereby lies the challenge. As it's enlarged, that means making a cowl, and of course a plug for the canopy so I can vac form it on Danny Fenton's vacuum jig. Shameless grovel.

I came away from WnW with a carload of balsa and ply, but the garage needs a sort out before I make the first cut. So I have to wait...

So not exactly a full detailed build log; I'll ask separate questions as I have before on separate threads, but I'll try and get some interesting pictures up for you all. Wish me luck.

Stevo01/07/2017 18:56:01
2699 forum posts
419 photos

Plywood spars cut out with reinforcing; rib templates cut from 3mm plywood.  I know the Stuka has been done a fair bit on here.. if you are interested bookmark it or drop me a reply, or I'll let it lie!

2017-07-01 10.04.52.jpg


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Edited By Stevo on 01/07/2017 19:07:34

Stevo01/07/2017 19:06:23
2699 forum posts
419 photos

Reinforcement of spars


Robert Parker01/07/2017 19:44:12
975 forum posts
1321 photos

Hi Stevo,

I'm interested in this one, 8% enlargement looks nice and big bookmarked.

Keep showing the progress.

I've got a Marutaka B25 in the attic, I have had a look at mine recently and it seems that they have used best oak instead of balsa, how is the wood quality in your kit? And as you say the instructions or lack of them just a few isometric drawings on the plans leaves a fair to be desired.



Stevo01/07/2017 20:08:54
2699 forum posts
419 photos

Best Oak?? that had me laughing

Kit? KIT?? we laugh in the face of a kit LOL.... This is built from the best planks of balsa from the SLEC/Balsa Cabin tents.. Straight off the plan

The lack of instructions does leave a hell of a lot to be desired. All I can think of is that they were drawn and never completed as an item....


BTW all those slots were routed in.. no hand tools were harmed in the making of this aircraft.

Edited By Stevo on 01/07/2017 20:12:30

Dwain Dibley.02/07/2017 01:14:52
1504 forum posts
1487 photos

Nice one Stevo..................I will be watching your progress old bean..


IanR02/07/2017 08:59:42
780 forum posts
4 photos

What sort of router set-up, Stevo? Did you feed the spars in by hand/eye or did you have some sort of alignment jig? The slots look really clean and straight.



Stevo02/07/2017 14:07:15
2699 forum posts
419 photos

Hi Ian,

This should explain it!!

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Stevo02/07/2017 14:08:10
2699 forum posts
419 photos

No bad for 1.5 days work

2017-07-02 13.24.35.jpg


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2017-07-02 13.46.55.jpg

Pretty much fitted first time... Now I have to make sure they are all in line...

Edited By Stevo on 02/07/2017 14:09:07

IanR02/07/2017 14:18:14
780 forum posts
4 photos

Yup - typical router work. 95% of the time setting up and 5% of the time actually routing. Very neat work and, yes, blooming good for 1.5 days.

Is that a 1/2" router you're using?


Stevo02/07/2017 14:22:44
2699 forum posts
419 photos

That's my small 1/4" shank Bosch..around 25 years old..!

Ill epoxy the whole lot together later!

kevin b02/07/2017 14:41:43
1837 forum posts
145 photos

Hi Steve.

Looking good so far.

Do you know anyone with a 3d scanner ? I have a Heller 1/24 scale kit (unbuilt) of the B2.

Robert. The Marutaka kits were all in Japanese, but most of the Royal versions had written instruction books with them as they were produced for the American market. I haven't got the B25 yet, but I have several of the others.

Stevo08/07/2017 18:22:52
2699 forum posts
419 photos

Another weekend, more done!

2017-07-08 10.07.55.jpg

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The unshaped LE is on, as are the beech UC mounts, engineered for a Blackhorse style system.

i12fly08/07/2017 18:50:55
632 forum posts
22 photos

Nice cat. They always like to be involved and help. Usually by lying on something you need then dropping asleep

Dwain Dibley.08/07/2017 23:48:54
1504 forum posts
1487 photos

Coming on Stevo, at the risk of showing my ignorance, what are the gaps in the T/E Dood ??


Stevo09/07/2017 17:24:36
2699 forum posts
419 photos

Hi Steve, Aha. The T.E strip is needed exactly where the hinges mount! Else the actual T.E of the sheeting is chamfered so they join together.

Here's the U/C mounts, fully Ply reinforced:-

2017-07-09 12.28.34.jpg

2017-07-09 12.28.42.jpg

.. heres the firsrt sheet. It was a devil to get it all straight, but I calculated a dgree of washout at the tips and locked it all solid pinning it to the board after checking so many times I lost count.

2017-07-09 17.16.49.jpg

Martyn K10/07/2017 13:06:18
5084 forum posts
3678 photos

Another one on my wish list..



Stevo16/07/2017 16:55:55
2699 forum posts
419 photos


Progess. Decided on Bowden cables and cranks... The access hatch is 2.4mm Liteply, It's not structural and is simply an access hatch.

2017-07-16 13.58.32.jpg

Edges of the balsa reinforced and the crank in place. The top bolt will get replaced with a mild steel bolt soldered to a small brass plate to stop it turning. A nyloc but will go on the other side. This gives full access to the crank and push rod to the elevator itself.

2017-07-16 16.27.41.jpg

Main points were reinforced with a ply plate.

2017-07-16 16.27.49.jpg

The hatch from underneath the wing.

2017-07-16 16.28.10.jpg

...and the actual snake run. No slop.

2017-07-16 16.27.55.jpg

Stevo16/07/2017 17:07:03
2699 forum posts
419 photos

Just some notes and ramblings.

Bottom of both wings are fully sheeted. Once the control runs are sorted, I'll join both of them togther. That way I can use an incidence gauge to check for any twist and accurately set any washout when gluing the top sheets on. Not looking forward to that - at all

One servo for flaps and one for ailerons. however there are two sets of flaps for each wing, so each 'set' is driven by a Y shaped pushrod.

Beech blocks are in place for the U/C, after I've looked at Linsday Todd's ventures with a Blackhorse Stuka for ideas and I thank him for his message.

Stevo22/07/2017 20:52:42
2699 forum posts
419 photos

All coming along nicely. Both Aileron linkages are sorted, now for the flaps.

2017-07-22 19.15.26.jpg

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Although the cranks appear to be at 90 degrees, They will be roatated further (clockwise) when the flaps are at 0. Each bowden cable is soldered into the quicklink, the 2mm pushrod is screwed in, locked with a 2mm locknut and also threadlocked as well. The M3 bolt will be threadlocked in, there is an M3 blind nut epoxied into the 3mm ply bracket.

The adaptor at the end of the shaft then feeds the two spilt flaps, so everything is adjustable. there will be a removable access hatch toaccess that.

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