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Design & Build Sport Twin

Sport Aerobat for 2 x 40s

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Jon - Laser Engines24/06/2019 09:56:57
4660 forum posts
173 photos

Depending on the sizes you might be able to 'vac form' your own cowls. All you need to do is make one wooden cowl plug from as much solid material as you can muster. Then cut the bottom off a 2l drinks bottle, shove your plug inside and hit it with a heat gun. The plastic bottle will shrink nicely around your plug and once you cut it free you can use it again for cowl no2.

If you are looking for a 100% perfect finish then this probably wont do, but if you want quick cheap and functional then it might be worth a shot.

Nigel R24/06/2019 12:36:44
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2856 forum posts
469 photos

That's a thought. How would you finish a shrunk bottle? I'm not too familiar with the technique (read: never done it).

Nigel R27/06/2019 08:47:24
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2856 forum posts
469 photos

Made a started on some cowling. First job, cut some noserings (turned on a drill), and then sort out the cutouts in the plastic spinners. As there were four cutouts I made a sanding tool from some scrap balsa shaped to the cutout I needed and just started scraping away at the spinner until I had four identical cutouts.

When that was done I could get the engines bolted in, with the nosering stuck to the spinner. I borrowed an idea from one of Pete M's build blogs - use some scrap 1/8 between the spinner the nosering, the nosering is held in correct position.

I've only got as far as the side pieces here (3/8 sheet):

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That looks decidedly odd with the perspective, but the motor on the left is dead ahead no rightthrust!

Anyway. Now the sides are in (and it took a while to fettle them in to position) the bottom can go on, at which point everything should be nice and solid, and I can remove the motor and put some triangular stock in the corners and get the top block on.

Then time for some more carve and sand yes

Nigel R29/06/2019 12:29:22
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2856 forum posts
469 photos

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Excuse the umbrella growing out of the port wing!

Got a good chunk of the block carve and sand exercise done. It's surprisingly hard work especially in the heat today! I will probably put the nacelles to one side now and get the nose on the main fuselage up to a similar point.

Nigel R03/07/2019 23:00:45
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2856 forum posts
469 photos

Changed my mind a bit and did another hour or two of sanding in the nacelles. Pretty much done with them now bar cutting out the opening for the motors.

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Nigel R06/07/2019 08:04:52
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2856 forum posts
469 photos

Getting the remaining nacelle jobs finished.

Some tank hatches:

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I was going to make them from liteply but I've run out, so I used 1/16 birch ply laminated to some leftover wing sheeting. They're a bit heavyweight for a hatch but they also retain the tank so need to be a bit tougher than usual.

I also hogged out the cowl area. Had to remove rather more material than I'd hoped...

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It still needs a little more relieving around the throttle arm and front of carb.

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After that, I realised I wouldn't be able to get the silencer on...

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...without hacking away another lump on the port side, to allow access for the silencer retaining screws. Hey ho.

After those fixes, I should have a pattern to copy on to the starboard nacelle.

There are not that many big woodwork jobs remaining - make and fit the fin and rudder, and do the block, carve and sand at the front of the fuselage - before the last leg of gear install and finishing.

Nigel R09/07/2019 06:48:02
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2856 forum posts
469 photos

A bit of trimming later:

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And now back to the fuselage...

 

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That needs rounding off. It's just been razor planed so far.

The nose area is tack glued on. It will be made removable. Then I get easy access to the nose leg and a possible location for rx battery or the rx satellite.

Edited By Nigel R on 09/07/2019 06:49:30

Nigel R18/07/2019 06:57:14
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2856 forum posts
469 photos

Fin and rudder are done so time for Some more carving at the back of the fuselage:

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And made a start on installing the servos:

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