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Design & Build Dornier Do 24

A bit of a challenge

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Robert Parker17/03/2019 16:50:55
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885 forum posts
1135 photos

Hi All,

More applications of Poly C to the wings today as well as experimenting with the receivers. I intend using two receivers on this model to make life a little easier at the patch, 1 located in the fuselage operating the rudders and elevators and the other in the wing for everything else.

My radio equipment is a Spektrum DX9 using a 4 channel receiver in the fuselage and a 6 channel receiver in the wing. I bought a new AR620 as it has no antenna and a AR400. I have never done this before even, so all set up TX on and in bind mode and both receivers in bind mode and both bound successfully however, on switching off both TX and RX's remove the bind plug and switched on Tx then RX's the 620 worked but the servos connected to the 400 barely moved, both RX's had separate power packs. Tried them both individually and they both worked fine.

So attempt 2. as above but changing the AR620 for a AR610 and re-bound both RX's bound and worked perfectly. I now have my receivers sorted.

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3rd, 4th and 5th coats being applied so far. In the background my new wing for my TN Lancaster is coming along well as the old one was beyond repair following a hard landing, new wing has liteply ribs and nacelle formers instead of balsa hopefully not added too much weight but gain strength..

Well back to give another coat of Poly C.

That's all for now

Regards

Robert

Robert Parker25/04/2019 14:05:42
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885 forum posts
1135 photos

Hi All,

Due to work commitments I have not done a great deal to the Dornier over the past few weeks.

I was a little disappointed with the Poly C as in a few areas the sheet covering warped / wrinkled in a few places but with a shape knife and some cyano most of them went back OK except for an area over the flap where the grain runs diagonally and I have a nice rippled effect which I have sanded and filled to be acceptable.

I have this week made the outer wing struts and changed the method of fixing to the sponsons as I was not happy with just using a wood screw so I opened up the underside of the sponsons and epoxied blind nuts on the hardwood I had previously fitted, much happier now.

Well mostly anyway, when I fitted the rear wing struts they did not align with the front ones as I had hoped. Still not the end of the world just looks a little odd from the front.

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The wing is now very solid and in parallel with the tail, now to patch up those holes and figure out how to make the diagonal brace between the front and rear cabane struts.

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Next I need to get the fuselage upto the dame level as the wing so more Poly C and cloth and decide how I'm going to get power from the battery in the fuselage to the wing, two ideas in my head at present.

That's all fro now

Regards

Robert

Simon Chaddock25/04/2019 17:23:51
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5404 forum posts
2824 photos

Those struts are aluminium?

I would simply use them!

Positive for the middle pair, return down the longer outer four. wink 2.

McG 696925/04/2019 17:44:22
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2502 forum posts
976 photos

Hi Robert,

Nice you're back to the Dornier.

Regarding the 'swollen' sheet, I don't know if you did it, but best is to cover the balsa with a thin layer of sanding sealer before applying the glass coat & Poly-C.

It avoids the wood to absorb too much water during the process.

Keep it up, young man.

Cheers

Chris

Robert Parker25/04/2019 19:24:51
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885 forum posts
1135 photos

Simon, I wish I had thought of that earlier in the build, but there may be a way, just need to think a little on it.

Chris, I did coat the whole model in sand n seal, which is water based and no problems arose when I applied it it was only after I started applying the Poly C, at first they went back but just stayed there.

I try to avoid using traditional sanding sealer / dope as my workshop was a spare bedroom before building the benches. Wanting to prevent my wife from complaining any more than she needs to I do try to avoid strong odours of paint, dope etc which I do outside and leave the model in the sun house overnight to dry if I can get away with it.

Regards

Robert

Robert Parker28/04/2019 16:37:42
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885 forum posts
1135 photos

Hi All,

Well having given Simon's suggestion some thought I went ahead with electrifying the struts, although front positive and rear negative

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These self tapping screws to be locked in place with cyano. Before fixing in place the connections were given a good pull to check the crimping was nice and tight.

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These two connections will be bolted on when the wing is attached using spring washers. Probably not the neatest solution.

I have carried out a voltage check, 12.35v at battery and 12.35v at the struts.

Now I have sorted this out I can resume finish off sheeting the hull.

That's all for now

Regards

Robert

Robert Parker01/08/2019 19:25:45
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885 forum posts
1135 photos

Hi All,

It has been a while since I have done anything to the Dornier. Having intended spending some time carrying out house renovations this turned out a to be a bigger and more expensive project that expected, still I have built up a fair decent amount of brownie points from the wife who is VERY happy with the end result. so much so that I think I have started her thinking of what's next.........uuummmmmmmmm, time to disappear back into the workshop for a while.

Anyway back to the Dornier, this week I have glassed the fuselage along with many many coats of Poly C and am now looking forward to spending my time with the wet "n" dry, at the moment there is nothing to really show as the poly C dries clear and it all looks like balsa.

I have also been fighting the urge to start another model as I'm missing the building part.

That's all for now

Regards

Robert

McG 696902/08/2019 23:15:36
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2502 forum posts
976 photos

Hello again, Robert;

Great to have you back in the shed.... and with a load of 'brownie points'.

If I'm allowed a suggestion, instead of 'overloading' your FG with coats of Poly C, why don't you try out the Freddie B formula? It's lighter, a lot easier to sand and gives a perfect finish even used on blue foam or Depron.

You can find it in my 'old' Ballerina build blog. Please have a look at page # 43 & scroll down a bit... really worth trying.

Cheers

Chris

Robert Parker03/08/2019 07:06:42
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885 forum posts
1135 photos

Hi Chris,

Thank's for that, I having read your Ballerina post, I recalled reading it at the time and over time it faded away in the old grey matter. Now printed off and filed for use.

Regards

Robert

Robert Parker11/08/2019 17:04:07
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885 forum posts
1135 photos

Chris, all I can say is wow "Freddie's formula", is great and as you say easy to sand though must add that a FFP3 or above dust mask is a MUST yes

Fuselage now ready for painting perhaps might get a coat on this evening if it stops raining long enough.

I'll try the wings next, which to be honest have not worked out as good as I had hoped for.

That's all for now, hopefully some photos next post.

Regards

Robert

McG 696911/08/2019 18:44:28
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2502 forum posts
976 photos

Hi Robert,

Fine that you tried the 'Freddie Sauce'... and glad that you liked it. yes

Regarding the sanding, I try to sand outdoors by preference. If not, I tend to use it 'wet' with some plaster sanding pads which work a threat on large curved surfaces.

When applied on fiber glassed balsa, I also pigment the 'sauce' with a contrasting acrylic colour - usually light grey - to help as a guide for sanding.

Looking forward to seeing some result pics, young man.

Cheers

Chris

Robert Parker11/08/2019 20:03:08
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885 forum posts
1135 photos

Hi All,

Well the rain clouds have moved on since my last post and I have given the fuselage a coat of primer / filler and also given the wings some of "freddie's sauce".

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I must say that I am well pleased in how much stiffness the glass fibre have added to the fuselage. I did not use poly C on the fuse as I did on the wings as the balsa still has got some give in it, so I opted to apply the glass with 50% watered down pva. I know I have added more weight but she will be landing on grass.

I'm giving the final colour scheme some thought and considering the dutch or spanish schemes but nothing cast in stone at present.

That's all for now

Regards

Robert

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