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Mark's Rutland A4 Skyhawk

by Mark Kettle

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Mark Kettle 101/09/2016 00:56:53
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2339 forum posts
1362 photos

The pair of wheel pants under the wing I fabricated to save some weigh, made from 3mm balsa mounted just inboard of the ailerons.

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Sanded to shape on the wing used masking tape on the wing to protect it.

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Bevelled the aileron fronts and hinged then, couldn't resist a deflection.

Mark Kettle 101/09/2016 01:04:35
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2339 forum posts
1362 photos

I've still got to do the connections for the torque rods to wing ailerons, but punched out and laid the parts out for the fuselage.

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Chris Barlow01/09/2016 03:05:29
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1808 forum posts
1228 photos

That's some serious progress Mark! I reckon you'll have it built in a week! yes

Phil Cooke01/09/2016 07:36:52
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2244 forum posts
1532 photos

yeah going great guns!! I do like the built up ailerons Mark - I think my next design will definitely incorporate those - taking the skins to the extreme T/E as you have done - saves a lot of time sanding AND guarantees a perfect aligned interface between wing and 'washed out' flying surface.

Andy Meade01/09/2016 08:38:24
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2596 forum posts
679 photos

Nice to see some proper craftsmanship going into a SkyPork at last Mark - none of this "knock it out of solid" laziness yes

Mark Kettle 101/09/2016 09:23:05
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2339 forum posts
1362 photos

Cheers lads, now, "lick of paint, lick of paint"indecision

About the wash out angle for continued flow of the panel to the trailing edge shown here, I packed it with another balsa wedge. 

 

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....sorry upside down. 

Edited By Mark Kettle 1 on 01/09/2016 09:52:16

Edited By Mark Kettle 1 on 01/09/2016 09:53:37

Steve Houghton01/09/2016 12:53:02
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517 forum posts
342 photos

Mark,

Good to see you doing yoga headstands to relax from the pressure of the approaching deadline. Just don't put the fin on the wrong side!


Steve Houghton01/09/2016 12:54:36
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517 forum posts
342 photos

P.S. I also built up the undercarriage fairings, but assembled off the wing - your method is probably much quicker.

Mark Kettle 101/09/2016 13:32:08
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2339 forum posts
1362 photos

Cheers Steve, built up undercarriage fairings much save a few grams.

Mark Kettle 101/09/2016 13:48:22
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2339 forum posts
1362 photos

Pulled the aileron servo wires out and started on the fuselage.

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10 oz is a nice number.

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The fan heater is helping to speed up the drying time.

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Glued the fin parts together and temporary glued two 2mm control rods on the trailing edge to keep it neat when sanding it to shape.

Mark Kettle 101/09/2016 16:13:00
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2339 forum posts
1362 photos

Well I've had a little sleep and the fuselage sides, nose assembly and few former's in it have dried.To speed up radio fitting I've not put the middle, rear top or bottom balsas' on the fuselage so access is still good. Made a switch holder that's being positioned near F3 up against the wing seat and it's the same for the RX the other side up against F3, being careful not to block the battery tube. Made a servo mount for the elevator servo a Hitec MG65 for the side of the fuse same side and just behind the switch between F3 and F4. Sanded the tailplane with the elevator on it's hinges in situ, to keep the trailing edge good I taped a 3mm metal rod on the bench and sanded down to that.

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This mount is screwed on a ply plate on the wing seat balsa.

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Below - the 1.5mm ply plate to support balsa wing seat.

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There's a extra piece of ply on the left screw nudged up to the RX to keep it on the rail's.

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Using 40 grit ( surprise) on this sander pad, it really 'eats balsa and spits out dust' !! Maybe to the horror of others.

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Edited By Mark Kettle 1 on 01/09/2016 16:17:04

Mark Kettle 101/09/2016 16:32:40
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2339 forum posts
1362 photos

Spoke to Andy Meade around midday to ask what size is the pilot he had just popped in the post, 35 mm high and with a head that's 22 mm in diameter, so a little diversion to make the headrest, and found a old AA square battery and started cycling it, after a charge and on one test the battery lasted 50 minutes with 1 amp draw measured on my Futaba tester.

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Mark Kettle 101/09/2016 19:32:39
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2339 forum posts
1362 photos

Whilst stuff dries, the rear jet pipe shroud I've made isn't quite right, I'll make it again this time closer to what I need with the addition of a deeper flat piece to hide the elevator horn plus I can use this to attach to the fin / tail plane supports.

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I need up to 30 mm up from the shroud.

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Put a wider piece of balsa in the glass. 10 strips of brown paper per side.

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Plus a pattern piece to aid cutting out when dry.

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In front of the fan heater to dry, there is another one the other side on a drinking glass. 

Edited By Mark Kettle 1 on 01/09/2016 19:34:28

Mark Kettle 102/09/2016 00:43:14
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2339 forum posts
1362 photos

The servo is in the body, wing bolt in place, needed a little sanding on the wing seat for a better fit for the wing and got the elevator rod in with supports.

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Bag covered the gear to keep the dust off and ready for a sanding the body later.

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Like other builders I found the lazer cut hole to big show made the pad a little smaller and made my own hole.

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Mark Kettle 102/09/2016 09:36:45
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2339 forum posts
1362 photos

Sanding day today to bring the fuselage into shape, however look what I found in the parts box.

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Bottom right of the picture is two little fillets that need to be glued to the fuselage sides prior to building, now you watch the weight go up with those in the model, I'll glue them in near to the trailing edge of the wing.

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I'm putting on some tape to guard against sanding the cockpit area to keep it sharp.

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Made a F9 ring to get the rear fuselage shape.

Harry Twist02/09/2016 10:02:20
294 forum posts
204 photos

Looks great Mark. Rapid progress - at this rate you'll have her be done by saturday night! Particularly like the built up ailerons!

Mark Kettle 102/09/2016 10:08:41
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2339 forum posts
1362 photos

Thanks Harry, watching others having to sand the aileron stock looked hard, so after measuring the wings panels stuck together I had enough material to include them ( ailreons) in the wing build. I have just been so surprise how well the little fillet fitted in, it's a well cut and together model Phil and Matt have designed.

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Edited By Mark Kettle 1 on 02/09/2016 10:09:38

Mark Kettle 102/09/2016 17:58:26
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2339 forum posts
1362 photos

Well I've made some balsa dust and shavings today.

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Pattern for rounded intake sides.

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Put a little prop after A3 former to support the run-out to a taper.

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Now I'll blend in the fuselage top into these rounded intakes.

Mark Kettle 102/09/2016 18:03:40
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2339 forum posts
1362 photos

Having some fun here turning plate pieces of balsa into a lovely rounded shape jet.

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To protect the this 1/16" - 1.5 mm balsa intake I've put tape over then whilst I sand the top balsa's down to it in a rounded fashion. 

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Just need to fill the gap next to the body top and make good. 

 

Edited By Mark Kettle 1 on 02/09/2016 18:09:04

Mark Kettle 102/09/2016 18:20:04
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2339 forum posts
1362 photos

From 3 pieces of 1.5 mm balsa 100 mm wide for the bridge from wing to fuselage.

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The tape on the fuselage allows me to really sand away with my 40 grade grit sanding pad.

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Previously I'd left these corners of the fuselage when sanding the fuselage, the reason was because I wanted to blend it in the wing at this stage.  

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Using a smaller finger pad for the fine blending. I really enjoyed this bit it brings the model jet to life!

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I kept putting a ruler across the gap to get it level. Lovely.

Edited By Mark Kettle 1 on 02/09/2016 18:23:30

Edited By Mark Kettle 1 on 02/09/2016 18:25:58

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