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Mark's Ballerina MK1


Mark Elen
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Hi Peter,

Yes, but there is a big hole in F2 that the tank and the battery will fit through if needed later. It will be a bit of a rave to get the battery out though. The tank will have to come out along with the throttle pushrod.

The NiMH receiver battery will be charged in situ. I only ever charge batteries under supervision, usually whilst I'm building.

Cheers

Mark

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Ah! Good. I couldn't see the hole in F-2

One thing that I have learned over the years in full size and models. If you can't get at it easily you will need to.

I can tell stories, for example. A simple job. Undoing one split pin and nut and bolt plus three stiff nuts, removing two small trim jacks and replacing them.Simple right?

If you can do it in eight hours you are doing well..

The Gloster rep said "Oh well, you take out those cables and that part and those and it is easy.

So he was asked "How long does that take.

Oh it takes a couple of days!!!

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I must say I agree with your answer to Peter, Mark.

This is looking like a very "untidy" work bench this time... frown

On the other hand, don't tell us now that you didn't calculate for enough translucent blue covering !!! ... surprise

You must have some left that you really 'forgot' about... somewhere... please try to remember.

Cheers

Chris

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Hi Gents,

Disaster averted. I managed to call in at my LHS (Gliders at Newark) today and purchased another metre of the same transparent Oracover 👍

Tonight I've been covering and hinging, I needed to hinge up the elevators so that I could fit the small filler piece behind the elevator joiner. I've also been filling in the gaps where I cut the covering around the tail plane, as these will stand out under the blue.

Used Vaseline on the hinge pins, heated to make it flow into the pin, then with a fine nozzle, filled the slots with superphatic. They are well stuck. The only problem with this method, is that because the hinges are a tight fit in the slots, the superphatic behaves like cyano and wants to 'grab' the hinges as they go in. Got there in the end though and they will be pinned with cocktail sticks stuck in with more superphatic.

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Cheers

Mark

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Hi Gents,

Many thanks for your kind comments.

Davey, the edges are part of the main covering. I will post up a photo later of my method. Basically it involves making sure the piece has a straight edge, then, using a scrap piece of 1/4" square hardwood, positioning the covering to leave the edge as you can see, then with a low heat, tacking the covering into position. After that, whack the temperature up and shrink around the curves. Cut off the excess with a sharp scalpel, stick down all of the edges, then with a hot iron, go over it all to finish.

I will say that I find, this Oracover is much easier to deal with than Solarfilm.

Cheers

Mark

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Here are the photos to go with the description above:

These first 3 with the iron on low, just tacking in place

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Once the corner is firmly tacked, iron on hot and shrink it down, no pressure put on the corners, it just needs to shrink and not stick.image.jpeg

Then scalpel off the waste

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And it then looks like this

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With the iron still on hot, go over the edges again with no pressure, to shrink out all of the creases, once they're gone, they can be stuck down.

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Then go over the whole surface with the iron on hot, again this needs little pressure, we want it to shrink out the wrinkles, not stick them down.

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That's it.

Cheers

Mark

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Thanks Mark, that's really useful, I think my main mistake has been sticking the wrinkles down, rather than shrinking the covering then sticking.

I've been using Solarspan, not sure if that is an easy or difficult covering to use, I've only covered one model so far with heatshrink......

I shall have a practise with some offcuts using your technique thumbs up

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Hi Davey,

I'm not sure about Solarapan, as I've not used it. This is Oracover, I'm pretty impressed with it, it will take a lot of heat without burning a hole.

With wrinkles, once you stick a wrinkle down, they are nigh on impossible to get out. I've got a lot of tiny ones on the really tight curves on that tail, but from a foot away you can't see them.

Definitely worth practicing as it is a bit of an art. Also have a play with your iron temperature. Once you get the knack, it isn't that hard, it's just time consuming.

Cheers

Mark

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I'll have to try that Peter👍

Hi John, hope you are well👍 I tend not to use the heat gun as I always end up burning my fingers as I'm holding the covering, end up hopping around the workshop swearing whilst trying not to make a mess of whatever it is I'm holding😂

Heres my plan for the tail wheel, the thinnest Ali I could find, it still needs Fettling and it will be held in place by the rudder horn.

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Cheers

Mark

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Use the heat gun after every edge is stuck down leaving just a tiny exit for the expanded air. No fingers involved.

As an added tip I shrink the covering on the wings by doing two ribs underneath four on top, four underneath working out top and bottom gradually.

THis help reduce any possibility of warping the wing.

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Hey Chris,

Hope you are well. Yes, the bottom half will be white, and as it will 'show through', I've had to make a great effort to get all of the lines straight and equal. I'm not overly happy that the white will have an edge to catch the oil from the engine (covering sequence should be top, bottom, then sides, this is going to leave a 'wrong edge' but the to do it properly, would mean the blue edge over the white.

Ive just realised my OCD is getting the better of me😂😂😂😂😂😂👍

All the best👍

Mark

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