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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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877 forum posts
1133 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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877 forum posts
1133 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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5371 forum posts
2818 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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2469 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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877 forum posts
1133 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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877 forum posts
1133 photos

Hi All,

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

dsc05819.jpg

dsc05820.jpg

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.

dsc05822.jpg

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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

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