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David's Standard Ballerina

First scratch build for many years

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David Hayward.22/02/2016 19:02:27
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168 forum posts
80 photos

Now preparing the tailplane/elevator and fin/rudder, sanding to shape and fitting hinges prior to gluing tailplane to the fuselage. I marked the positions of the hinges on masking tape on the top surface and then used a square to mark the edge. I found the hole in the Robart hinge tool too large for the size drill I wanted to use (I thought they were Robart hinges and expected the drill guide to be the right size) to inserted a piece of brass tube with one layer of masking tape wrapped round to form a snug fit in the guide; now the holes for the hinges will be centred accurately.

20160220_115231[1].jpg

This all worked out well plus I chamfered the rudder and elevator as required.

Next came the task of fixing the tailplane to the fuselage which for some reason I find a bit stressful, making sure that it is positioned correctly and level. For level I sat the model on a flat table and with the wings level, checked the tailplane and found I had to sand the fuselage a little before it was right. I measured from the wing to the tailplane on each side to ensure it was straight; hopefully all this will work out right.

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john stones 122/02/2016 19:24:47
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10763 forum posts
1481 photos

Yep I've just glued t/plane and the fin on, makes me a gibbering wreck as well teeth 2

John

David Hayward.22/02/2016 19:37:57
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168 forum posts
80 photos

Thanks John, glad I'm not alone.

Chris Barlow22/02/2016 20:32:02
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1858 forum posts
1266 photos

I'm usually fine with that bit until I mix the glue! Even after checking and re-checking, measuring and planning the procedure I still get that feeling of trepidation and paranoia!

Lucas Hofman22/02/2016 20:41:03
599 forum posts
316 photos

This is the way to do it gents, so your planes should come out fine like most of the others. And remember that a mm more or less will not be noticable and not be visible as soon as you take the ruler away.

And if you botch it up: you can take it apart. I once bought an ARF with tailplane that was glued in a seat that was very much not level with the wing. Took not more then 15 minutes to cut it loose, and then half an hour to adjust the slot and reglue.

So breath deep, measure 3 times, glue and measure once more while the glue is still soft to confirm it is ok. And then make a cup of tea, a gin and tonic or what you deem suitable to celebrate yet another job done!

Edited By Lucas Hofman on 22/02/2016 20:44:03

Peter Miller22/02/2016 21:22:34
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10331 forum posts
1231 photos
10 articles

I d0n't know what you guys are worried about

.My tailplanes rarely line up perfectly with the wing. No one notices and they still fly beautifully!

I do worry about the fin being pretty well luined up with the centre line.

David Hayward.22/02/2016 21:31:56
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168 forum posts
80 photos

On another topic.... rather than mounting the switch on the outside of the fuselage, is it still acceptable to mount it inside and operate the switch with a short length of piano wire?

john stones 122/02/2016 21:34:17
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10763 forum posts
1481 photos

Yes, but why not in cockpit ?

John

David Hayward.22/02/2016 21:48:52
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168 forum posts
80 photos

Yes I was thinking of the cockpit floor as another option, but I did wonder about the inside with piano wire option as I don't see that done much these days?

Edited By David Hayward. on 22/02/2016 21:50:03

Devcon123/02/2016 07:33:02
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1384 forum posts
487 photos

I sometimes think it's a shame to cover all that lovely carpentry work up, especially the spruce stringers. Maybe one day a completely clear version would be interesting.

I would always worry about transferred vibration passed into a mechanical switch from a length of piano wire. There was an interesting article in , I think, in RCME recently about switches with some interesting options.

John

Peter Miller23/02/2016 08:16:02
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10331 forum posts
1231 photos
10 articles

I often use Dubro switch mounts that have the wire through the side with a neat knob on the end.

I also use the cockpit floor as a good switch location.

I once desiged a model for the other side called "Size Zero" That was done in transparent Solarfilm. Looked great in flight.

I have recently done an enlarged version but that is in normal colours.

David Hayward.24/02/2016 12:04:27
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168 forum posts
80 photos

So fin is next, have shaped the two parts either side, whatever they are called? They are just very slightly oversize so I can sand to final fit once the glue is dry; as there is plenty of surface area I just used PVA, trust this will hold ok.

20160223_200908.jpg

Peter Miller24/02/2016 12:14:32
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10331 forum posts
1231 photos
10 articles

Hi David. They are just called fairings.

PVA or Aliphatic is what I use for most of the construction. If that fin comes loose it will be the least of the damage, after all, it is farthest from the impact!!

My current model (Super Marauder) does have a verzy weakly mounted fin as it is butted on top of txhe tailplane with very tiny fairings.

In this case I have used two 1/4" dowels into and very thick tailplane platform right through the tailplane. Possiby a bit overkill but fins falling off are very bad news indeed.

David Hayward.24/02/2016 12:35:34
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168 forum posts
80 photos

Oh thanks for the re-assurance Peter. Fairings! not difficult is it; blonde moments are gaining in frequency the older I get.

Devcon124/02/2016 12:48:30
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1384 forum posts
487 photos

Hi David,

Is it me or the plan, looking at yours you've placed the horizontal stabiliser right against the last former leaving the hinge line forward of the vertical stabiliser hinge line.

For some reason I placed mine so the both hinge lines ended up on the same axis lined up with the very rear of the fuselage.

It's not a problem as I guess you've got a built in slot ready to marry up the elevator and that's how you've planned it anyway, or I have got it wrong.

Just curious as with the plan not to hand I'm not sure which is the correct placement.

John

Devcon124/02/2016 12:55:48
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1384 forum posts
487 photos

Just looked at one or two others and I've done my mine wrong, note to oneself, "check the drawings"....frown

David Hayward.24/02/2016 13:03:19
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168 forum posts
80 photos

Hi John, this was one of the corrections to the plan picked up along the way as they were discovered. It appears this was one of a few (many) discrepencies between Peter's original drawing and the interpretation by the RCM&E 'draughtsman'.

Peter Miller24/02/2016 13:42:19
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10331 forum posts
1231 photos
10 articles

Hi John.

Yes, For some unknown reason the tailplane was moved back. It won'tmake any noticeable differnce.

NOTE TO SELF.

Make sure that my drawings are clear to the less understanding people!!.

David Hayward.26/02/2016 17:41:05
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168 forum posts
80 photos

OK, cover your eyes, it's a naked Ballerina!

p1020206.jpg

p1020215.jpg

john stones 126/02/2016 17:47:39
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10763 forum posts
1481 photos

She's a looker David yes

Have fun covering the fuzz, took me hours wink

John

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