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JB Aviation DH71 Tiger Moth

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Robert Parker25/10/2020 19:20:29
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1030 forum posts
1446 photos

Hi All,

This is a kit I have wanted for many years and when one came up on eBay I bought it. I asked the seller before purchase if there were any plans as I could see any in the photos provided and the seller assured me that none were provided just follow the instructions. Well, that was back in the summer and now that my Junkers F.13 is awaiting decals I just could not resist making a start.

On reading the instructions there were several references to "see drawing", so there should have been a drawing in the box. Now, this is going to be interesting to build. The tail feathers are all sheet so no problems there. I have spent most of the afternoon looking through the parts and trying to get my head around the build. Thankfully, included in the box was a 1974 copy of Aero Modeller with an article on the full size plus I have a few photos from the net.

I have an OS 52FS (70th-anniversary edition) waiting to be fitted

Only two full-size DH 71's were built, G-EBQU and G-EBRV, they were built in 1927 for high-speed research and a test-bed for the new Gypsy engine (QU) while RV had a cirrus engine. With just a wingspan of 22ft 6ins in standard form and a smaller 19ft speed wing.

QU took the 100km closed circuit record in it's class at 186mph faster than most of the RAF's contemporary fighters. It also made an attempt on the altitude record in it's class reaching over 19,000ft above which the pilot could not without oxygen although the aircraft was still climbing at over 1,000ft/min. In 1930 it was shipped to Australia where it crashed when the engine cut just after take off killing the pilot on September 17th.

RV was withdrawn from flying after a short racing career in 1928 and was stored in the rafters at the De Haviland works, this was destroyed when the works were bombed by a Junkers Ju88 on October 3rd 1940.

dh 71b.jpg

This is what it should end up like

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The box contents,

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Loads of CNC cut parts

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dsc08350a.jpg

If anyone has built one of these I would be grateful for any advice. The fuselage build could be a bit tricky after the basics are done and at the moment I'm a bit lost on how the wings are to be built with the jig, perhaps it will come together as I progress.

That's all for now

Regards

Robert

Geoff S25/10/2020 20:34:48
3902 forum posts
57 photos

I saw one of these kits for sale, unstarted, at a swap meet years ago and quite fancied it but I was too slow and when I went back, it had gone! It's a model I've always fancied, too, so I'll be watching with interest.

My only crumb of advice is to search the on-line plans services like Aerofred and Outerzone for a sinilar plan. Even if it doesn't represent the one you're missing it'll be a guide.

Geoff

Geoff S25/10/2020 20:42:34
3902 forum posts
57 photos

There's this one at Outerzone. It's a smaller wingspan but, as it's available as a pdf, you can print it from the pdf with Adobe Reader at whatever scale/wing spn you choose.

Geoff

john stones 125/10/2020 21:31:48
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11764 forum posts
1521 photos

Nice Robert, love it. yes

Jim Carss26/10/2020 14:28:23
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2140 forum posts
85 photos

Robert

Derick Scott has the 50" version of the plan,good news he can scale up or down to whatever size you want.

**LINK**

Jim

Robert Parker29/10/2020 19:44:47
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1030 forum posts
1446 photos

Hi All,

Thank you for all of your replies. I have downloaded a plan which helps plus a fellow forum member is sending me some photos of the plan. So hopefully the build will be a lot easier with them as it feels as if I'm doing a jigsaw without the picture.

I have made some progress on the easy bits and getting sorted where some of the obvious parts fit but still a little puzzled in a couple of areas so far. I'm hoping the photos will help here.

I have glued the doublers to the fuselage sides and placed the servo tray and formers in position as well as mounting the engine and making the tail feathers.

dsc08352a.jpg

1 left side and 1 right side

dsc08353a.jpg

Nice new engine mounted

dsc08354a.jpg

Tail feathers and fuselage top all glued together,

So that's the easy bits done.

That's all for now

Regards

Robert

McG 696929/10/2020 19:55:56
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3456 forum posts
1320 photos

... great looking aeroplane, Robert.

I'm afraid I can't be of help here, but I just subscribed anyway.

Lots of build pics to come, I hope... cool

Cheers & stay careful

Chris

Robert Parker30/10/2020 18:59:51
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1030 forum posts
1446 photos

Hi Chris,

Good to have you on board.

Regards

Robert

Robert Parker31/10/2020 15:17:30
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1030 forum posts
1446 photos

Hi All,

Firstly, I must thank Martin for sending me photos of the missing drawings who's friend is building one at the moment what a coincidence as well some build photos.

I now have the "picture" for my jigsaw and so can proceed with confidence.

dh71 jb aviation drawing 1.jpg

Now it makes sense

jb aviation drawing 2.jpg

dh71 jb aviation drawing 3.jpg

So with confidence at high I made a start with the fuselage

dsc08356a.jpg

Servo tray and formers all of the parts are cnc cut and come away from their sheets with little effort and just trim off the tabs.

dsc08355a.jpg

Tail seat and former

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Second side on and all square

Building this took me back to when I built my JB/ATS Kite around 20 years ago.

epson099.jpg

An advert from RCM&E 2002. I also fancied the Merlin as well as the DH 71 but I have never seen one up for sale.

I'll carry on with the fuselage tomorrow when the glue has set.

That's all for now

Regards

Robert

Martin Harris31/10/2020 16:42:04
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9594 forum posts
258 photos

The same friend who supplied the plans had a Merlin too - which flew very well and very regularly but sadly (IIRC) a non-extended 35 MHz transmitter aerial was its eventual undoing.

A little care may be needed when building the wings - the jig doesn't necessarily guarantee a true build although it certainly should in theory - we never found out why but his old one had a very significant twist in one panel when it emerged from his workshop! So much so that when I test flew it for him and started with significant aileron deflection already applied mechanically, I ran out of trim and had to put even more, but to give it it's due it has never detracted significantly from its flying characteristics even if it does look a little odd on the ground.

His latest one is as straight as a die...

Nick Somerville31/10/2020 17:04:57
174 forum posts
100 photos

I built a foam/obeche wing version of the Dh 71 from a Pat French model purchased in 1985. It was my first low wing model and was a pleasure to fly. Powered by a plain bearing OS 40 but I don’t recall the wingspan. Same colour scheme of green and yellow but G-EBRV. Used caping strips on the top wing before covering with solartex to simulate the ribs.

Edited By Nick Somerville on 31/10/2020 17:10:18

Robert Parker01/11/2020 17:28:10
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1030 forum posts
1446 photos

Hi All,

A little more progress today.

The mid to rear section of the fuselage was today's work area.

dsc08360a.jpg

Lower longerons in place and ply plate fitted to the left of the photo

dsc08361a.jpg

Once the lower longerons had dried it was time for the top triangle section.

The fuselage jig was not really required as the fuselage is self-jigging more for me to hold it in place I did check it after the glue had dried and straight and true.

dsc08363a.jpg

After a bit of sanding to the top edges, the top sheeting is then glued down.

Whilst the assembly is drying I had a dry fit of the front end, tomorrow's task.

That's all for now

Regards

Robert

Geoff S01/11/2020 19:14:04
3902 forum posts
57 photos

Looks a well designed jigsaw type kit Are those fuselage sides balsa or lightply? It makes me more annoyed/sad that I didn't grab the one I saw at the swap meet about 6 years ago.

Perhaps a 'proper' drawing isn't neessary after all.

Geoff

Robert Parker01/11/2020 22:31:31
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1030 forum posts
1446 photos

Hi Geoff,

There is no need for a "proper" drawing and the sides are lite ply there is a fair bit of lite ply in the kit I would say around 70% lite ply.

Regards

Robert

Geoff S01/11/2020 22:57:19
3902 forum posts
57 photos

Thanks, Robert. Perhaps there's hope in a possible balsa free universe after all.

Geoff

Robert Parker08/11/2020 16:23:20
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1030 forum posts
1446 photos

Hi All,

The front end took a bit of time to do this week, doing a bit then waiting for the glue to cure then do a bit more, and so on.

Fitting the battery floor, tank floor to the bulkhead went ok and dry fitting the formers and engine mount dry went well but got a bit messy gluing it all together with epoxy.

dsc08364b.jpg

dsc08366b.jpg

After the epoxy had been left over night more epoxy was applied to the joints as per instructions and left to cure.

Then work started on building up the chin and fuel proofing before covering in.

dsc08367a.jpg

That's the chin done

dsc08368b.jpg

Next the hatch and greaseproof paper fitted to the joint to stop it from becoming a permanent part of the nose

dsc08378a.jpg

The lid fitted

Next, I'll plane/sand to profile before making the hood.

That's all for now

Regards

Robert

Geoff S08/11/2020 21:14:38
3902 forum posts
57 photos

Looks like it's progressing well.

I'm glad I'm not the only one who, after successfully doing a dry fit, has problems with assembly as soon as there's any glue in the offing

Geoff

Richard Elvin 108/11/2020 23:28:09
12 forum posts

Good evening Robert, just a quick question. Is your fuselage jig home made or are they available to purchase.

The build is looking good.

Richard Elvin

Geoff S08/11/2020 23:38:21
3902 forum posts
57 photos

It looks like a SLEC building jig to me.

Geoff

Dwain Dibley.09/11/2020 00:32:10
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1577 forum posts
1562 photos

Ditto.

D.D.

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